Bosch Therm 660EF/660EFO Remote Controller

The Bosch Therm 660EF/660EFO Wired Remote Controller, part number BRC01US is specifically designed for the Bosch Therm 660EF/660EFO units.  The wired remote gets wired to the Bosch 660EF/660EFO unit using 18 ga wire and can be installed up to 300' maximum away from the heater.

The wired remote should be installed in a location that is accessed easy from the main point of hot water use such as on the bathroom wall.  The default setting for the 660EF/660EFO is 120° F.  For most residential applications, the recommended setting is 120° F. 125° water is scalding and is very dangerous.

The Bosch Therm 660EF/660EFO gas tankless water heaters come with wired, marked connectors in the unit by the main control board.  The wired connectors are marked, 120°, 130°, 140° and 160°.  You must have the remote controller to achieve the 160° temperature. 

The remote control comes with many special options.  The remote control will give error codes on the display in the event of a problem (refer to the service manual or contact Bosch Technical Support for error codes and troubleshooting).  The upper limit of the hot water supply temperature can be changed to 100°F, 105°F, 110°F, 115°F, 120°F, 125°F, 130°F, 135°F, 140°F and up to 160 with the remote control.  There is also a unique flow meter alarm setting on the remote control.

The flow meter alarm setting can be used to set a desired amount of gallons of water maximum that is normally used.  As an example:  say your bath tub holds 50 gallons of hot water.  You can press and hold the flow meter alarm until it starts flashing and then set the remote to a maximum of 42 gallons of water.  So when you go and fill the bathtub with hot water and once the remote senses it has flowed 42 gallons of water an alarm will sound and then you would have to physically go and shut the water off at the source.  The alarm will stop after 10 seconds.

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