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Bosch Gas Tankless Water Heaters Therm 660 EFO
A Gas tankless solution for medium sized Outdoor Install Residential applications
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Bosch Therm 660 EFO
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The Therm 660 EFO incorporates an evolutionary hydro-power ignition system which allows this
tankless water heater to work without a standing pilot, grid connection or battery! A small
turbine inside the water heater uses the energy from the flowing water to ignite the burner.
The modulating gas valve then maintains a constant temperature at varying flow rates. This
innovative technology, patented by Bosch, makes this an ideal product for installations
without access to electricity or regions prone to inclement weather and power outages.
This Bosch Therm 660 EFO Gas Tankless Water Heaters is only sold to Licensed Installers.
For Licensed Installers - click here to purchase the Bosch Therm 660 EFO
For Retail Bosch Tankless Water Heater - Click Here!
Bosch 660 EFO Specifications:
- Type - Non-Condensing
- Application - Residential
- Max Input (BTU) - 140,000
- Min Input (BTU) - 20,000
- Capacity at 35 (°F) Rise (gpm) - 6.6
- Capacity at 55(°F) Rise (gpm) - 4.2
- Intelligent Cascading - No
- Min Flow Rate - 0.5 gpm
- Temp Range (°F) 100 to 160
- Energy Factor - 82%+
- Thermal Efficiency - 83%+
- Installation Options - Indoor
- Dimensions (w x h x d) - 14" x 20 ½" x 7"
- Weight (lbs.) - 37
- Inlet Connection - ¾" NPT
- Outlet Connection - ¾" NPT
- Gas Connection - ¾" NPT
- Max Water Pressure - 150 psi
- Min Water Pressure - 13 psi
- Min NG Presure - 4" WC
- Venting Options - None Outdoor Unit
- Energy Star Rated - Yes
Bosch 660 EFO Features:
- Outdoor installation with freeze protection
- 83%+ thermal efficiency
- 140,000 BTU maximum input
- 6.6 gallons per minute capacity at 35F degree rise
- Electronic ignition
- Can be used in recirculation and space heating applications
- Minimum activation flow rate of 0.5 gallons per minute
- 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
- Warranty 5 years on all other parts
- Available in NG and LP models
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Bosch 660 EFO PDF Manuals
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