Saturday, December 13, 2014

Calculating the Volume of Water in a Water Line

Whenever you turn on a gas, propane or electric tankless water heater the hot water starts heating up as soon as the minimum flow rate is met for the hot water demand. It takes a few seconds for the water to get heated up to the requested temperature. But, before the hot water starts to flow out of your shower or sink faucet the cold water that is in the pipe has to be pushed through your faucet. This is often referred to as pushing a "cold water slug".

Customers frequently ask us how much water is contained in this cold water slug and how long it will take to push this slug through their faucet. This can be easily calculated by using the formula for the volume of a cylinder.

The formula for the volume of a cylinder is V = Pi x r x r x h

where Pi = 3.1416; r = the radius of the water line; and h = height (or in this case the length) of the line

If your water line is 1/2" then r = .25" and r x r = .0625" and Pi x r x r = 0.19635 square inches
If your water line is 3/4" then r = .375" and r x r = .1406" and Pi x r x r = 0.4417875 square inches

Now to get all units in inches calculate h (the length of the water line) by taking feet x 12". As an example let's assume we have a 40' water line of 1/2" pipe. 40' = 480" so we calculate the Volume as:

V = 0.19635 square inches x 480" = 94.248 cubic inches

Now there are 1728 cubic inches in a cubic foot and there are 7.48 gallons in a cubit foot. Therefore there are 0.0043 gallons in a cubic inch.

So, 94.248 cubic inches * 0.0043 gallons = 0.4 gallons of water.

If you are running this cold water slug through a 1 GPM sink faucet then it will take .4 x 60 seconds or 24 seconds to push the cold water slug through the 1 GPM faucet. Add a few more seconds for the tankless water heater to bring the water up to temperature and remember that there are about 15' of internal pipe in a gas or propane tankless water heater that also starts out with cold water. In this example it will take just more that 1/2 minute to get the hot water flowing out of the faucet.

Tuesday, November 4, 2014

Bosch Neutralizers for Condensing Boilers and Water Heaters


Bosch recently has started to carry the Condensate Neutralizers for all the Bosch condensing boilers and Bosch tankless water heaters.  Condensate Neutralizers are recommended on all condensing equipment and should be serviced annually. Currently we offer 6 different JJM condensate neutralizers that cover the entire product range from the smallest output of 57,000 BTU (16kW) to the largest of 5,443,000 BTU (1,550kW).


Below is a list of what condensate neutralizer to use for each Bosch condensing boiler and Bosch tankless water heater.

The JM-2C & JM-2C PLUS can be used for any boiler or tankless water heater up to 200,000 BTU.

The JM-6C must be used for the Bosch C1210ES/ESC as it is over 200,000 BTU

Please call us at 866-289-4652 for more information and pricing.

Friday, October 24, 2014

Bosch Compress HP 200-1 Being Discontinued


Bosch has recently advised all wholesalers that the Bosch Compress HP 200-1 Heat Pump # 7736500041 is being discontinued.  Bosch is always looking for ways to improve products and while an analysis is conducted to look into options to offer a new model in 2015.  Support for the Compress HP 200-1 will still be available through Bosch Technical Support.  This item is currently out of stock.

Wednesday, October 22, 2014

Changes to Bosch Therm Outdoor Vent Kit - BTOK

Bosch is in the process of changing the color of all the Bosch Greentherm, Therm and Greenstar units to White from the old color of Silver.  This will effect the Bosch Outdoor Vent Kit - BTOK.

The new Bosch Outdoor Vent Kit - BTOK will change to white also.  Please see the new part number listed below.

 BTOK - #7736502448, (Old part #7709003213)

Thursday, October 16, 2014

Changes to Bosch Therm Gas Tankless Water Heaters

Bosch is always upgrading their products and coming out with new and better models and changes.  Below are a few new changes to the Bosch Therm gas tankless water heaters.

The current silver-gray cover will be changing to Bosch white. This change is consistent with the Bosch residential product visual branding, such as with Greenstar, Greensource, Greentherm, and Therm.  Once the inventory of the units with silver covers is sold then Bosch will start changing over to the new white covers.

Warranty updates
For recirculation applications:
The C950ES, C1050ES and C1210ES 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, and C1210ES products produced prior to April 2014 (before FD 420) will follow the previous warranty statement.




Wednesday, October 15, 2014

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.


Thursday, September 11, 2014

New 2015 Energy Factor Changes affecting Bosch Tankless Water Heaters

A major change to the water heater market is on the way, creating both challenges and opportunities for plumbing, heating and HVAC contractors, designers and engineers.

New energy efficiency mandates from the U.S. Department of Energy (DOE) will take effect on April 16, 2015. They require higher energy factor (EF) ratings on virtually all residential water heating products including gas-fired, oil-fired, electric, tabletop, instantaneous gas-fired and instantaneous electric.  Tankless systems already exceed these EF requirements, and all other water heating products manufactured before the DOE mandates take effect can still be bought and installed after the changeover date.

“It’s important for contractors to become familiar with the new rules and the technology options,” said Ralph Perez, director of product management, A.O. Smith, in an interview with Perspective Media. “There are products available that comply with the 2015 regulations, but they are generally not yet in the mass market.”

While all affected models will see an increase in the EF requirement, the most dramatic changes are in larger capacity models (see accompanying chart).  That’s because the only technologies that now meet the EF requirements over 55 gallons are electric heat pump water heaters and high-efficiency condensing gas water heaters.
The Bosch gas fired tankless water heaters affected by the new energy factor are the Bosch 330PN LP & NG, Bosch 520HN LP & NG and the Bosch 520PN LP & NG.