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Bosch 520 HN LP Tankless Water Heater

Liquid Propane Tankless Water Heater Bosch 520 HN LP

Brand: Bosch
SKU: 520 HN LP
Mfg Number:
  • Fuel Type: Liquid Propane
  • Input (BTU): 117000
  • Ignition Type: Hydro-Generated
  • Energy Factor: 0.8
Availability: Out of Stock
Product Information
Retail: $1,197.00 Price: $1,026.00
You Save: $171.00 (14.3%)


Bosch has manufactured the propane gas tankless water heater model 520 HN LP with 5.3 GPM capacity. The Therm 520 HN NG 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. With a maximum input of 117,000 BTU, the unit supplier endless hot water for up to 2 applications at a time.

Bosch 520 HN LP Tankless Water Heater Specifications
ItemWater Heater
Gas Connection (In.)3/4
Gas TypeLP
Input (BTU)117,000
Ignition TypeHydro-Generated
Draft Hood Size (In.)5
Energy Factor0.80
Depth (In.)8-1/2
Width (In.)16-3/4
Height (In.)25-3/4
Water Connection (In.)1/2
GPM @ 45F Rise4.2
GPM @ 90F Rise2.1
Manufacturers Warranty Length15 Year Heat Exchanger And 3 Year Parts
StandardsCSA And ANSI Z21.10.4
ComplianceCertified For Use In Potable Water Applications in CA and VT
IncludesMounting Bracket

Bosch 520 HN LP Gas Tankless Water Heater Features:

  • Patented Hydro-power ignition requires no electricity
  • 80% thermal efficiency
  • 117,000 BTU maximum input
  • 5.3 gallons per minute capacity at 35F degree rise
  • Endless hot water for up to 2 applications at a time
  • Minimum activation flow rate of 0.6 gallons per minute
  • High to low temperature control
  • Vents with galvanized B vent - natural draft
  • Built for durability and serviceability with 15-year warranty and 20+ year life expectancy
  • Available in LP

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