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The NEW Bosch AquaStar 2700ES NG (Natural Gas) Tankless Water Heater is built to supply 2-3 major applications at a time! With a maximum BTU input of 199,000 BTU/hr, this heater is Bosch's most powerful offering. In warmer climates, you may be able to run 3 simultaneous showers!
The Bosch AquaStar 2700ES is a sealed combustion tankless water heater, which means that you can pull combustion air from outside (recommended) or potentially from the inside (depending on your available air volume). The exhaust venting can run either to an outside wall or up through the roof.
The AQ3ES vent kit is required for venting out the side wall. You may use PVC or rigid sealed 3” or 4" pipe for the intake air. Please read the Installation Manual for the full details.
The Bosch 2700ES NG can easily be converted to an outdoor heater for qualifying locations by adding the optional AQOK Outdoor Kit.
Our most powerful offering, its compact size and sealed combustion enables installation in small spaces. This unit also features an adjustable temperature control for improved comfort.
With an average life expectancy of more than 20 years,
energy savings of up to 50%, and an endless supply of
hot water, your family will thank you for years to come.
Easy to install with multiple venting options, the Bosch
AquaStar 2700ES-NG whole house tankless water heater is the right choice.
The Bosch AquaStar 2700ES-NG (Natural Gas) whole house tankless water heater features the following:
- Delivers over 7 gallons per minute, enough to run two to three Major Applications at once!
- Direct vent room-sealed combustion
- AQ3ES Vent Kit required for horizontal venting
- ES VVT Vent Kit required for vertical venting
- AQOK Vent Kit required for outdoor installations
- Electronic ignition - 120V Plug-in (No standing pilot!)
- Built-in power vent allows for vertical or horizontal venting
- Built-In Back Flow Preventer to keep cold out
- 12-year warranty on heat exchanger & 5 years on parts
- Computer-adjusted fuel and air mixture optimizes performance
- ActivationFlow Rate: .65 gpm
- Optional remote thermostat (TSTAT2) available to digitally control output temperature
- Saves up to 50% off utility costs
- 82% efficiency rating and .82 energy factor
- Qualifies for 2009-2010 Federal Tax Credit
- ENERGY STAR Compliant
- Approved for installations up to 8000 Feet
- Space saving size and weighs only 67 pounds. Easy installation!
- Provides an ENDLESS supply of hot water
- State-of-the-art Bosch quality and engineering
- Pressure relief valve included
- Built-in Freeze Protection
- CSA approved
Please note that this unit requires either 3" or 4" sealed stainless steel venting for Category III Gas Appliances (see the installation manual). We recommend that a professional contractor install any gas appliance.

Sales Sheet with Technical Info Summary>>
Bosch 2700ES Installation Manual>>
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