Best Condensing Tankless Water Heater - Bosch vs the Competition

Every major tankless water heater manufacturer has a 199,000 BTU condensing tankless water heater. The reason: anything over 200,000 BTUs will not qualify for the coveted Energy Star label.

The entire tankless industry has moved from non-condensing to condensing tankless water heaters due to the high efficiencies and low cost for PVC or polypropylene venting. So, how do you pick the best condensing tankless water heater from such a crowded field?

Bosch has long been the industry leader in condensing tankless water heater technology. And right now is a very exciting time to purchase a Bosch Tankless Water Heater because of the current offerings that include water connections on either the top or the bottom of the water heater.

Competitors:
Navian offers a few condensing models and are high efficiency units but all have the water connections on the bottom making it a lot more difficult to replace a standard tank heater as the water connections are on the top of the tank.  Some of the Navian condensing models are the NPE-a and the NPE-S series.

Rinnai has a few high efficient condensing models also such as the RUCS series but also have the same bottom water connections making it more difficult to replace a standard tank heater.

Most installers will go with the Bosch Greentherm 9000 series for new installations because of the time saved with top water connections.

For further questions on the new Bosch Greentherm 9000 series units please call Global Protankless Supply at 866-289-4652

Warranty for Bosch Stainless Steel Indirect Storage Tanks

This is to cover the warranty of the Bosch Stainless Steel Indirect Storage Tanks.  The Bosch indirect storage tanks have a Limited Lifetime Warranty.  The lifetime limited warranty is for all Bosch stainless steel indirect storage tanks installed in residential applications. 

The Bosch Stainless Steel Indirect Storage Tanks covered under this warranty are:
Bosch SST SST150-40     40 Gallon
Bosch SST SST250-65     65 Gallon
Bosch SST SST300-80     80 Gallon
Bosch SST SST450-119   119 Gallon

WARRANTY COVERAGE
First Ten Years –Limited Warranty

Bosch Thermotechnology Corp. (BTC) warrants that the Tank assembly will remain free of leaks for ten years from the date of original installation provided that the Tank is properly maintained by a qualified heating contractor and the other conditions of this warranty are met. If during this time BTC determines that the leak is the result of a defect in workmanship or materials, BTC, at its option, will repair or replace the Tank. Labor charges are not included.

Eleventh Year and Beyond– Limited Warranty

Beginning on the eleventh year from the date of original installation and thereafter, BTC provides a limited prorated warranty for defects in the Tank. If BTC determines that the leak is the result of a defect in workmanship or materials BTC will, at its option, repair the defective Tank or replace it with the most comparable model available from BTC at the time of the replacement, provided that the purchaser pays for the proportionate charge set forth below. The proportionate charge is based on the current list price of the Tank involved in the warranty claim (or the nearest comparable model). The purchaser is charged a percentage of the list price of the Tank (at the time of the claim) as detailed below.

If the Tank is no longer available, BTC will provide a new residential hot water Tank at the then applicable retail price less the proportionate charge for the Tank as set forth in the table above (the charge will be calculated using the last list price of the discontinued Tank). Labor charges are not included.

Other Hot Water System Components

All other components outside of the indirect tank will be covered for 1 year from date of installation.

Please be aware there are many factors and elements that affect the Bosch SST units.  One major factor that is not covered under the lifetime limited warranty is high levels of Chlorine in the water.  BTC will not warranty a unit that is installed in an area that has 80 parts per million (ppm) or higher of Chlorine in the water.  People with high levels of Chlorine or other minerals in the water should use a glass lined indirect tank and at current this is not an option through Bosch. 

Please visit the link above to review the full warranty under the Bosch website.

Low Stock on Bosch 450 ESR NG (Natural Gas)

Global Pro Tankless Supply is just about out of stock on the Bosch 450ESR NG recirculating heater. The 120,000 BTU Bosch Protankless 450 ESR NG Tankless Recirculating Water Heater is temperature modulated and has an electronic ignition. Theis recirculating water heater is designed and approved for heating and recirculating potable water in conjunction with an indirect tank. The 450ESR recirculating water heater is not approved or designed for closed loop heating applications.

The Bosch 450ESR unit is not a traditional tankless water heater. It has no flow switch to respond to water flow. Instead it is a recirculating water heates designed for tank loading applications. When an aquastat (not included) hooked up to a tank tells the ESR that water needs to be brought back up to temperature, the ESR will tell a circulator (not included) to turn on to create flow through the heater to reheat the water in the tank.

Please call Global Pro Tankless Supply at 866-289-4652 while supplies last.

New changes to the Bosch Greentherm C950ES & C1050ES

Bosch is always making changes to their products to help improve performance.  Below are a few changes that have recently been approved for the Bosch Greentherm C950ES & Bosch Greentherm C1050ES tankless water heaters.

There have been a lot of new accessories added and approved for the heaters:
Accessories (Bosch part #)
• Concentric termination kit 3"/5"PVC (196006)
• Concentric vent kit 80/125 PP (7738003210)
• Concentric Up and Out kit (7 738 003 210)
• Neutralizer Kit (7738001483)
• Isolation Valve Kit (7738003449)
• Optional wireless remote control to operate with the appliance
(7709003213)
• Cascading kit (7 709 003 962)
• Outdoor kit (7709003913)
• Concentric termination kit 3"/6" PVC (196016)
• Exhaust/Intake bird screen (L2594)
• Condensate drain tee (196061) [included with Concentric
termination kits]
• Pipe Cover (PTPCES)
• High temperature kit (7736500074)
• Recess box kit (7736500043)
• Pressure relief valve (7 738 001 152)

The Bosch Greentherm C950ES & C1050ES can now be vented using 2" PVC/CPVC and must use the twin pipe system for this application.  Please see the venting section in the installation manual for more details.

The Front cover for the Bosch C950ES & C1050ES is changing from Silver to White.  This will be in effect for all the Greentherm and Therm units.

The Thermal Efficiency for the Greentherm C950ES heater is 94% with an Energy Factor of .95.
The Thermal Efficiency for the Greentherm C1050ES heater is 96% with an Energy Factor of .95.

Warranty updates
For recirculation applications:
The C950ES & C1050ES heat exchanger warranty has been improved to 10 years for the following applications:
- Controlled recirculation applications
- Combination DHW and space heating applications
This warranty statement takes affect with products produced since April 2014 (FD 420). C950ES & C1050ES products produced prior to April 2014 (before FD 420) will follow the previous warranty statement.

Bosch Tankless Water Heater Warranty

Bosch Thermotechnology provides the warranty for all of its Bosch tankless water heaters, including gas, propane and electric tankless water heaters in addition to the electric mini-tank water heaters.

You can find the full details of these Bosch product warranties at: http://www.bosch-climate.us/support-center/product-warranty.html

At this link you will also find the Bosch warranties for their Geothermal Heat Pumps, Bosch Greenstar Boilers, Stainless Steel Storage Tanks, and Solar products.

The warranty is always provided by the manufacturer, so you can contact Bosch directly with any warranty questions. Bosch also provides the warranty for all of its replacement parts.

Call us at 866.289.4652 if your Bosch water heater, boiler, storage tank or replacement part are out of warranty and in need of replacement. We offer Next Day Air, Second Day Air, and Ground shipping options for all of our Bosch products.

Clearance Pricing on Bosch Tankless Water Heaters

Are you looking to save $$ but demanding the quality of a Bosch Tankless Water Heater? Check out our Bosch Tankless Clearance Heaters!

Our Bosch clearance water heaters are fully warranted by the manufacturer and carry the full 15 year warranty on the heat exchanger and 5 year warranty on all parts. These clearance heaters are prior model tankless water heaters that Bosch has just recently taken out of their current water heater lineup.

We are Bosch's distributor for these clearance heaters. Just like with the current Bosch tankless water heaters, Bosch requires that the water heaters be installed by a licensed professional installer.

We also stock all of the venting and accessories that you will need to complete your installation.

Our quantities vary depending on the model you are seeking. Call us at 866.289.4652 for pricing and availability on these discounted Bosch tankless water heaters.

Bosch 345/450 ESR Tankless Recirculating Heaters

The gas tankless recirculating heaters, Bosch 345 ESR and the Bosch 450 ESR are temperature modulated and have electronic ignition.  The ESR stands for Electronic ignition, Sealed combustion and Recirculating.  These recirculating heaters are designed and approved for heating and recirculating potable water in conjunction with an indirect storage tank.

The 345/450 ESR are not approved or designed for closed loop heating applications.  The ESR units are not a tankless heater as they have no flow switch to respond to flow.  Instead it’s a recirculating water heater designed for tank loading applications.  When an AquaStat (not included) hooked up to a tank tells the ESR that water needs to be brought back up to temperature, the ESR will tell a circulator (not included) to turn on to create flow through the heater to reheat the water in the tank.   Please refer to the installation and applications manual. 

The Bosch 345 ESR recirculating heater is a 95K BTU unit and can deliver 3.5 GPM at a 45 degree rise.  Efficiency is 82%

The Bosch 450 ESR recirculating heater is a 120K BTU unit and can deliver 4.5 GPM at a 45 degree rise.  Efficiency is 81%

The temperature control range for both heaters can be set anywhere from 115°F (45°C) - 190°F (90°C)

The 345/450 ESR comes with a standard ¾” pressure relief valve. 

The 345/450 ESR has a special built-in freeze prevention cycle and is controlled by a sensor.  Freeze protection is always assured by the operation of the appliance.  If the primary NTC (temperature) sensor detects temperatures 9°F below the selected temperature, the appliance starts on minimum power until the sensor reads selected temperature.  In the case of minimum set point temperature then it will start at 41°F.  The use of non-potable additives like glycol is not approved.

The Bosch 345 ESR and the Bosch 450ESR must be installed indoors according to the provided installation manual.  The 345/450 ESR is NOT approved for outdoor installations. 

The Bosch 345/450 ESR recirculating heaters must be vented in accordance with the installation manual and require Category III 3” stainless steel sealed venting for the exhaust.  These heaters are direct vent units and must be vented directly to the outside in accordance with the installation manual.  These heaters cannot be combination vented with any other appliance.  The intake should be taken from the outside and 3”PVC or other material can be used only for the intake air.

The Bosch 345/450 ESR recirculating heaters are gas specific so they cannot be converted from one gas type to another.

Thanksgiving Day Sale on Greenstar Boilers & Tankless Water Heaters

Pro Water Heater Supply is excited to offer special Thanksgiving Day / Black Friday / Cyber Monday sale pricing on all Bosch Tankless Water Heaters and all Bosch Greenstar Boilers.

We carry the full line of all current Bosch tankless water heaters, including the Bosch 1050ES, Bosch 1210ES and the very popular Bosch 520PN / 520 HN units. The Bosch 520 series heaters are available in both natural gas and propane and require no electricity!

We also have special pricing on the very popular Bosch 660EF indoor tankless water heaters and the Bosch 660EFO outdoor tankless water heaters. Did you know that we are the only source for the correct Bosch 660EF Adaptor that is needed for all Bosch 660EF installations?

In addition to the full line of current Bosch tankless water heaters we are the exclusive outlet for prior model units, such as the Bosch Integra 500 (199,000 BTU Condensing) and the Bosch Evolution 500 (199,000 BTU Non-condensing). We still have a large quantity of these Clearance Heaters and they are priced Thanksgiving Day, Black Friday and Cyber Monday to move!

Looking for a Bosch Greenstar Combi 151 Boiler or Bosch Greenstar Combi 100 Boiler? We have these and the other Greenstar straight boilers for sale at a deep discount promotional price. The Bosch Combi boilers are our most popular wall-hun condensing boilers as they provide for both space heating and domestic hot water (DHW).

Bosch Therm 660EF / 660EFO Tankless Water Heater Sale

For a limited time the Bosch Therm 660EF indoor tankless water heaters and Bosch Therm 660EFO outdoor tankless water heaters are on sale for a special low price. The Bosch 660EF/EFO heaters are 140,000 BTU direct vent tankless water heaters and they are available in both natural gas and propane models. They require 120V power for the fan forced exhaust.

The Bosch Therm 660EF indoor tankless water heaters require 3" single-wall stainless steel vent pipe and are designed to be vented either through the roof or out the side wall.

The following four models are available for same-day shipping:

• Bosch Therm 660EF-NG (Natural Gas)
• Bosch Therm 660EF-LP (Liquid Propane)
• Bosch Therm 660EFO-NG (Natural Gas)
• Bosch Therm 660EFO-LP (Liquid Propane)

Check out our special discounted pricing as these heaters are available at this reduced pricing while supplies last.

Also consider purchasing the following:

• Webstone EXP2 Isolation Valve Kit 44443PR
• Bosch Therm 660EF Remote Control
• 3" Stainless Steel Venting

Bosch Therm Tankless Water Heaters are LOW NOx

Bosch Therm Units meet low NOx - Gas Tankless Water Heaters

Bosch Thermotechnology North America, a leading provider of energy efficient water heaters, heating and air conditioning comfort systems as well as high quality solar thermal systems for commercial and residential use, announced today the following Therm tankless products from Bosch meet recently enacted Low emission (NOx) requirements passed by utility regulatory agencies in California and Vermont: Therm C 1210 ES/ESC; C 1050 ESC; 950 ES; 940 ES/ESO and 830 ES. All models offer NOx emissions of 14 ng/J or 20 ppm or less. California and Vermont are currently the first two states to enact the 14 ng/J or 20-ppm NOx level.

In accordance with the new guidelines as published in new Air Quality Management District (AQMD) ordinances, the following Bosch models will no longer be sold nor allowed for installation in areas that are subject to these AQMD ordinances: Therm 520 PN/HN; 330 PN, and 660 EF/EFO. AQMD’s are regulatory agencies supported by state government to help control and preserve air quality standards for a given area.

Therm units from Bosch include a unique design using a wide flame pattern and secondary dilution air that results in a lower flame temperature during the heating process. Combined with condensing technology, which utilizes a secondary heat exchanger to capture more heat from the exhaust for preheating incoming cold water, these models offer an attractive tankless water heating option that meets future code requirements today while offering optimal efficiency.

The complete Therm line from Bosch features models with updated software that delivers performance-enhancing characteristics including a minimum activation flow rate of 0.5 gallons per minute (GPM) and the ability on many models to cascade up-to-24 units for larger commercial applications. The Therm line includes ENERGY STAR® rated models, powered by natural gas or propane, which have an industry best 15-year warranty.

HVAC & plumbing professionals and affected homeowners in California and Vermont are encouraged to check with local regulatory agencies to ensure compliance of all tankless units with the new low NOx requirements. 

www.prowaterheatersupply.com 
Commercial division of Global ProTankless Supply
1.866.289.4652

Bosch SST Stainless Steel Indirect Storage Tanks for DHW

The greenstar condensing space heating boilers are specifically designed for space heating only but can also be used for Domestic Hot Water (DHW) when they are piped to a Bosch SST Stainless Steel Indirect Storage Tank using a pump, aquastat and check valves.


Bosch SST Stainless Steel Indirect Storage Tanks for Domestic Hot Water come in four models ranging from 40 gallons up to 119 gallons:

• Bosch SST150-40 - 40 gallon storage tank; 115,000 Max BTUs
• Bosch SST250-65 - 65 gallon storage tank; 154,000 Max BTUs
• Bosch SST300-80 - 80 gallon storage tank; 171,000 Max BTUs
• Bosch SST450-119 - 119 gallon storage tank; 216,000 Max BTUs

SST, the new stainless steel line of domestic hot water indirect tanks, feature important enhancements such as a welded and passivated stainless steel tank and heat exchanger, and two-inch thick, high-density insulating foam with a tested R value of 13.4.


The Bosch SST Stainless Storage Tanks feature the following:

• 316L passivated stainless steel tank interior provides superior durability & longevity, offering resistance to the corrosive tendencies on domestic water
• 304L high capacity stainless steel coil efficiently transfers high volumes of BTU's from heat source to domestic water stored in the tank, making 1st hour delivery among the industry's best
• High density CFC/HCFC free polyurethane foam insulation yields the lowest stand-by losses in the industry
• State-of-the-art six axis programmable robotic welder uses computer guidance to accurately weld all stainless steel fittings and coil to the tank
• Warranty: limited lifetime tank & parts

7 Ways to Heat Domestic Hot Water with Bosch Products

Are you looking to heat your domestic hot water (DHW) for your showers, sinks, dishwasher and washing machine? If so, Bosch offers 7 different ways to achieve this goal in highly efficient ways! This blog entry provides a detailed comparison of the different ways Bosch can help you heat your DHW.

1) Bosch Therm gas and propane condensing tankless water heaters. Bosch offers several models of condensing tankless water heaters ranging from 175,000 BTUs up to 225, 000 BTUs. These electronic-ignition tankless water heaters have a secondary condensing heat exchanger that reclaims heat and redirects this heat back to the water thus reducing the exhaust temperature. As a result the exhaust temperature is cool enough to be exhausted via 3" or 4" PVC or CPVC piping. These heaters are generally about 92% efficient and can produce enough hot water for 2 to 3 showers at a time, depending on where you live.

2) Bosch Therm gas and propane non-condensing tankless water heaters. Bosch offers several models of non-condensing tankless water heaters ranging from 75,000 BTUs up to 199,000 BTUs. On the higher end from 175,000 BTUs up to 199,000 BTUs the Bosch tankless water heaters have an electronic ignition and require special 3" or 4" stainless steel venting. These heaters are about 82% efficient and are a great solution for most families. On the lower end the heaters range from 75,000 to 117,000 BTUs and have either a standing pilot light or use Bosch's patented Hydro Ignition system. These heaters are perfect for "off-grid" installations or areas with frequent electricity outages. In the mid-range Bosch offers both indoor and outdoor electric-ignition 140,000 BTU heaters that require 3" stainless steel vent pipe.

3) Bosch Tronic electric tankless water heaters. The Bosch Tronic line of electric tankless water heaters are available both in whole-house models (Tronic 5000 Series) or in point-of-use models (Tronic 3000 Series). Both the Tronic 5000 and 3000 Series heaters are tankless and will produce endless hot water. Be sure to verify that your electric supply meets the minimum requirements for these heaters. The Amperage is the key.


4) Bosch Ariston Pro Ti electric mini-tank water heaters. The Ariston Pro Ti line of mini tanks range from 2.5 gallons up to 7 gallons. Like a regular hot water tank, these mini-tank heaters keep water hot and ready for use in highly efficient glass-lined tanks. These heaters are perfect for point-of-use applications, but will generally be insufficient for showers. The heaters plug directly into a 110 wall outlet and draw only 12.5 Amps.

5) Bosch Compress 3000 HP 200-1 heat pump. The 50 gallon Bosch Compress heat pump is a great addition to the Bosch line of domestic hot water heating products. This ultra efficient water heater uses technology similar to an EnergyStar qualified refrigerator. Rather than taking heat from the inside of the appliance and moving it outside as a refrigerator does; the Bosch heat pump technology takes heat from outside the appliance and uses it to heat the water!


6) Bosch Greenstar Combi Boilers. Bosch offers two Greenstar Combination ("Combi") boilers ranging from 100,000 BTUs up to 151,000 BTUs. Each of these two Combi boilers can heat hot water for space heating as well as provide for a domestic hot water loop. These wall-hung, gas-fired condensing boilers are highly efficient. They come ready for natural gas and include a kit to swap over to propane use. Heating DHW with a Greenstar Combi boiler is perfect for homes that require hot water for their space heating needs.


7) Bosch Greenstar Boilers with Indirect Tanks. The Bosch Greenstar lineup of space heating boilers includes four gas-fired condensing boilers ranging from 57,000 BTUs up to 151,000 BTUs. Heating DHW with a Bosch Greenstar space heating boiler is simple when used in combination with a Bosch SST Stainless Steel Indirect Storage tank. Bosch offers four models of indirect storage tanks ranging from 40 gallons up to 119 gallons. The boiler heats a coil that runs through the indirect storage tank which in turn heats the potable water in the tank. 


With seven different ways to heat DHW, Bosch offers a solution for just about any application or need.

New Bosch Tankless Universal Control Board

Bosch has released a new Universal Control Board (part number 87072073680) for their "World Two" tankless water heaters.

The board comes with three jumpers and instructions as to where to place those jumpers to make the board model-specific.

One jumper specifies if the heater is a 175,000 BTU or a 199,000 BTU appliance, another jumper specifies the gas type - NG or LP, and another jumper specifies if the heater has a surface-mounted outlet temperature sensor or is using a newer immersed sensor that is included on some recent production heaters.

Additionally, the world two universal control board is able to automatically determine if it is being used on a condensing or non-condensing tankless water heater.

This universal control board can be used on the following Bosch tankless water heaters for both natural gas and propane:

• C1050ES, C950ES, 940ES, 940ESO, 830ES
• C800ES, 715ES
• Integra 500, Evolution 500
• AquaStar 2700ES, AquaStar 2400ES

Call us at 866.289.4652 for more details or to place your order.

Bosch Compress 3000 HP 200-1 Electric Heat Pump Water Heater

The Bosch Compress 3000 HP 200-1, 50 Gallon Electric Heat Pump Water Heater is ultra efficient and shares technology similar to an Energy Star qualified Refrigerator. Rather than taking heat from the inside of the appliance and moving it outside as a refrigerator does; Bosch heat pump technology takes heat from outside the appliance and uses it to heat the water!  Using a specially designed heat pump system, the heat is transferred from the surrounding air to the water stored in a well insulated storage tank, resulting in efficient hot water and zero direct greenhouse gas emissions!

Compared to a traditional tank water heater, the Bosch Electric Heat Pump Water Heater is twice as effective with savings of $307 (59% reduction on your water heating costs), making it the smart choice for your water heating needs with an estimated payback in just three years.

Features:

•  Zero emissions - clean electric operation and no venting requirements
• Easy to read LCD display allows for easy operation and ideal temperature, efficiency and demand settings
• Simple installation utilizing standard connections required for traditional tank water heaters
• Warranty: 10-year tank & parts

The Bosch heat pump water heater also cools and dehumidifies unconditioned air as an extra benefit, saving money and energy on air conditioning. Installing in unconditioned spaces with air temperatures between 45°F - 115°F will yield the highest efficiencies for the Bosch heat pump water heater. With use of the ducted air option, the Bosch heat pump water heater uses the energy of the unconditioned air to supply cooler, dehumidified air into the air duct, reducing the overall energy load of your home.

Bosch Integra 500 Tankless Water Heater

The Bosch Integra 500 Condensing tankless water heater is a top performance, fully condensing gas tankless water heater from Bosch. This 199,000 BTU heater is designed for residential applications and can deliver hot water up to 140 degrees F with a 10.5 GPM flow rate.  Not approved for space heating applications.

This Energy Star approved tankless water heater can produce enough hot water for 2-3 major applications in most homes.

Unlike traditional non-condensing models, condensing technology captures heat from the exhaust gas and uses it to preheat the incoming cold water. This increases efficiency and reduces emissions -- well ahead of the 2012 Low NOX emissions standards set by SCAQMD (California -- South Coast Air Quality Management District).

The Bosch Integra 500 features an electronic ignition system and can vent through either 3 inch or 4 inch diameter PVC vent pipe either through the side wall or up through the roof. A concentric venting option is available.

The Bosch Integra 500 comes with built-in Freeze Protection and is the same as the Bosch Therm C 1050 ES tankless water heater except that it also comes with a 3/4" PRV and an External Water Filter. The Integra 500 has a white cover and the Bosch C 1050ES has a silver cover.  Both heaters are 199,000 BTUs and have the same temperture rise. 

The Bosch C800ES is the same as the Bosch Integra 500 and the Bosch Therm C 1050 ES tankless water heater except that it comes with a 3/4" PRV and it does not come with built-in freeze protection.  The External Water Filter is optional, but recommended.  The freeze prevention kit is designed to provide protection for the water heater down to approximately 5°F for short term conditions only. It will not protect the appliance in areas where the temperature is routinely expected to be below freezing.  The freeze prevention kit will not protect plumbing outside the appliance from freezing.

The Bosch Integra 500 comes with a limited 15 year warranty on the heat exchanger and 5 years on all other parts.  Service and labor costs are not covered.

Greenstar Combi 100 & 151 Gas Fired Condensing Boilers

The New Bosch Greenstar Combi 100 (100K BTU) & Bosch Greenstar Combi 151 (151K BTU) Gas Fired Condensing Boilers are new to the American market but have been in use for years in Europe.  The combi 100 is 98.5% efficient as the combi 151 is 96.5% efficient.  The new Bosch Greenstar condensing boiler line is engineered to offer the ideal solution for residential heating and hot water needs at an affordable price, without compromising quality or fuel economy.

"Combi" (combination) unit with space heating and integrated water heating in one highly efficient, compact unit. With special insulation to ensure ultra quiet operation and the exclusive keypad safety lock feature to prevent unwanted tampering with heating controls, this unit is the ideal "green" unit.

Limited lifetime heat exchanger and 5-year parts & labor warranty

All models available as NG or LP

Special insulation ensures ultra-quiet operation

Compact dimensions and built-in frost protection offer flexibility for location of installation

ECO mode for energy saving fuel consumption

Exclusive safety feature - keypad safety lock prevents unwanted tampering with heating controls.

Each unit features an ASME approved Al-Si heat exchanger constructed of advanced Magnesium-Aluminum-Silicon alloy - offering increased flexibility versus traditional stainless steel. They are equipped with highly durable heating blocks that are corrosion resistant and designed to optimize clean burning combustion over an extra large surface area, which requires minimal servicing and reliance on spare parts during the boiler’s lifetime.  The Greenstar units come set for Natural Gas (NG) and there is a conversion kit that is included with the unit if it has to be converted to Liquid Propane (LP).

The Greenstar Combi units are designed for heating such as radiant floor heat or baseboard heating with multiple zones depending on the size of the unit and also for domestic hot water (DHW).  

The combi 100 unit besides being used for heating applications is also designed for DHW for 1 major application at a time - 72 degree rise at 2.4 gpm while the combi 151 could possibly do 2 applications at a time and will deliver - 72 degree rise at 4 gpm.

Depending on the size of your home and the heating and DHW applications you are looking for, you would need to get an HVAC or gas technician to size the unit properly as they would have to factor in,  size of home, insulation "R" factor, windows, etc..

Bosch Tronic 5000 WH17 & WH27

Bosch Tronic 5000 WH 17 & WH27 Electric Tankless Water Heaters

Ideal for replacing your electric storage tank water heater. The Bosch Tronic 5000 WH17 & WH27 electric whole house tankless water heaters are compact and powerful and can be installed virtually anywhere inside the home. Advantages include endless hot water, reduced electricity costs and substantial space savings.

Designed to replace a 20 - 40 gallon electric tank. The Bosch Tronic WH17 &  Bosch Tronic WH27 electric tankless water heaters are built to last. They have Plastic Polymer Modules and brass fittings. Each heater module is protected by an electro-mechanical thermal cut-out. If the temperature of any of the heater modules gets too high (over 195 degrees), then the cut-out will trip and cut the power to that heater module. If the cut-out trips, it must be reset while the circuit breakers are off. If you are not comfortable or qualified to perform this task, consult the original installer or a licensed electrician. This cut-out will only trip in exceptional circumstances. These small electric tankless water heaters can be installed virtually anywhere in the home and, of course, produce an endless supply of hot water.

There are many changes in the new Bosch Tronic 5000 WH17 and the WH27 compared to the older models Powerstream Pro RP17PT and RP27PT.

The new improvements for the Bosch Tronic 5000 WH17 and the WH27are:

• The units overall height is shortened by 4 inches due to reconstruction and placement of the main PCB board in the bottom of the unit.  (WH17 PCB Board #8-738-701-732, WH27 PCB Board #8-738-701-738).
• The Heating element assembly modules inside the unit have been redesigned to change the flow of the water in the modules to a different angle so as to not allow the mineral deposits to build up on the elements.
• There has been new single triac and dual triac PCB boards attached to the top of the heating modules as to give the heater more sensibility and maintain a more consistant heat.  (Single Triac PCB #8-738-701-733, Dual Triac PCB #8-738-701-723).
• The Thermal Cutouts on the top of the heating modules have been redesigned to trip at a little lower temperature of 195 degrees F to keep the elements from being damaged and overheating and hurting the piping and modules.

The minimum activation rate required for the unit to activate. (Activation rates: WH17 = 0.6 GPM, WH27 = 0.8 GPM).

The WH17 & WH27 are designed for cold potable water only. These water heaters are not designed for preheated water or recirculation applications. Increase flow rate where ever possible if water is coming out too hot.

Verify incoming water supply is at least 30psi. For people on well systems, the recommended pressure range is 30-50psi.

Maximum flow rates for each unit are as follows. WH17 = 2.3gpm, WH27 = 3.5gpm.

Bosch 520HN Power & Temperature Control knobs

The new Bosch Therm 520HN that comes in either natural gas or liquid propane has 2 new control knobs for adjusting temperature and flow on the front of the heater as the older Bosch AquaStar 125 series heaters only had 1 control knob to adjust flow.

The Bosch 520HN has 2 control knobs on the front of the heater. The control knob on the left is the Power control knob and allows you to set the height of the burners for hotter temperatures or cooler temperatures. The control knob on the right is the Temperature Adjustment knob and is for adjusting the flow of water through the heater which has the ability to speed the flow of water up making it cooler or slowing it down and making it hotter.

Below is how turning the Temperature Adjustment knob effects the heater:

Knob Position		Clockwise		Counter-clockwise
Degree Rise		90° F		45° F
Activation Rate		0.5 GPM		1.1 GPM
Max Flow Rate		2.0 GPM		3 .7 GPM

As the temperature adjustment knob is turned counter-clockwise, the output temperature will lower and the activation rate of the heater will be raised. Turning the knob clockwise will raise the temperature and lower the activation rate.

When turning the left Power Control knob to the left will give more power and higher water temperatures. Turning the knob clockwise will give less power and cooler water temperatures.

The Bosch Pro 520 HN has a gas control that modulates burner input in response to flow. Its purpose is to ensure that the hot water temperature will remain steady, although the water flow demand might vary.

Bosch Therm 660EF/660EFO Tankless Water Heaters

The new Bosch Therm 660 EF and Bosch 660 EFO are direct vent units.  These units take thier combustion air from the area they are installed in.  The 660EF/EFO are compact in design for space saving installations and are only 14" x 20 1/2" x 7".  The 660EF/EFO are designed and approved for reciculation and space heating applications.  The units have electronic ignition and come equipped with built in freeze protection.  The Bosch Therm 660EF vents either vertically or horizontally using 3" or 4" stainless steel venting #AL29-4C. 

The 660EF is manufactured in Japan and comes with a different vent connection than the 830ES, 940ES, etc.  The 660EF needs to be vented with single wall stainless steel venting and is designed to connect directly to "Bosch Vent".  However, a Z-Vent adapter (Part # 2SVSWB03) allows for the use of 3" Z-vent stainless venting to be used.  Global Pro Tankless Supply carries the adapter and all the Z-Vent stainless steel venting to install the Bosch Therm 660EF.  We are the exclusive distributor for the AQ5EF Side-wall Vent Kit for the Bosch 660EF tankless water heater.

The Bosch Therm 660EFO outdoor unit comes ready for installation and does not require any additional cap or venting.

Without the Z-Vent adapter (Part # 2SVSWB03), the customer would have to purchase different venting ("Bosch Vent") to use for the 660EF.

The Bosch Therm 660 EFO is our most compact outdoor model and is loaded with features you’d expect from Bosch, including freeze protection and built-in high temperature capability (160°F).

The Bosch Therm 660 EFO is a good replacement for the GWH425HNO and the 125BO as these units have been discontinued. 

The Bosch Therm 660EF and Bosch Therm 660EFO have an excellent warranty:

• 15 year limited warranty on heat exchanger; 3 year warranty if used in direct recirculating applications

• 15 year warranty on heat exchanger if used if recirculated through a storage tank such as the Ariston mini-tank

• 5 year warranty on all other parts

Bosch Therm C1210ES/ESC vs Bosch Pro GWH C920ES/ESC

Recently the Bosch Pro GWH C920ES/ESC was changed to the new model name Bosch Therm C1210ES/ESC. The model name was changed to reflect gallons per minute (gpm) at a 35 degree temperature rise. So the Bosch Therm C 1210 ES/ESC reflects a 35 degree temperature rise at 12.1 gpm. Along with this name change came many new features:

• Comes equipped with freeze prevention now.
• Has the capability to accept preheated water up to 140 degrees and is approved for Domestic Hot Water (dhw) and space heating applications in conjunction with an indirect tank.
• Has the ability to be cascaded using the Intelligent Cascade Kit for up to 24 units and would produce up to 290 gpm.

The Bosch Therm C1210 ESC commercial unit also has the ability to reach a maximum temperature of 180 degrees for commercial use.

The temperature range for the Bosch C1210ES is from 100 - 140 degrees. With the use of the Bosch Therm High Temperature Kit the unit would have the ability to reach up to 180 degrees.