Therm 520 HN

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Patented Hydro-power ignition saves electricity and gas



The Therm 520 HN 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.

Therm 520 HNSpecifications
Condensing/Non-Condensing Non-Condensing
Application Residential
Max Input (BTU) 117,000
Min Input (BTU) 30,735
Capacity at 35°F Rise (gpm) 5.2
Capacity at 55°F Rise (gpm) 3.4
Intelligent Cascading No
Min Flow Rate 0.6 gpm
Temp Range (°F) n/a
Temp Stability (°F) n/a
Default Temp (°F) n/a
Energy Factor 0.78
Thermal Efficiency 80%
Installation Options Indoor
Dimensions (w x h x d) 18½" x 36¾" x 10½"
Weight (lbs.) 35
Inlet Connection ½" NPT
Outlet Connection ½" NPT
Gas Connection ¾" NPT
Max Water Pressure 150 psi
Min Water Pressure 30 psi
Min NG Presure 5.7" WC
Condensing Heat Exchanger n/a
Venting Options Galvanized B-Vent
Vent Maximun Run n/a
Energy Star Rated No


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