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Bosch ProTankless 425 HN LP (Liquid Propane)

Product Overview

Bosch ProTankless 425HN-LP (Liquid Propane) whole-house tankless water heater

117,000 BTUs, Hydro Ignition, B-Vent exhaust

In stock


Eligible for Free Ground Shipping on orders over $199

Our Price:

Regular Price: $1,999.00

Special Price: $1,899.00


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Bosch ProTankless 425 HN LP (Liquid Propane) Whole-House Tankless Water Heater

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  • Bosch ProTankless 425 HN LP (Liquid Propane) Whole-House Tankless Water Heater
  • Bosch ProTankless 425HN-L Tankless Water Heater

    The Bosch ProTankless 425 HN L (Liquid Propane) 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 117,000 BTU/hr maximum input heater has enough power for running a shower and a sink simultaneously.

    This Bosch Pro Tankless water heater can be used as a replacement for any of the Bosch propane tankless water heaters that used the HydroGenerator, including the Bosch AquaStar 125HX LP, Bosch AquaStar 1600H LP and the Bosch Therm 520 HN L. It can also be used as a replacement for any of the Bosch propane tankless water heaters that had a standing pilot light, including the Bosch AquaStar 125B LP, Bosch AquaStar 1600P LP and the Bosch Therm 520 PN L.

    We have 9 units left in stock as of 8/27/2021.
  • Brand Bosch ProTankless
    Model Bosch ProTankless 425HN-LP
    Gas Type Liquid Propane
    Product Type Whole House
    Indoor/Outdoor Installation Indoor
    Heater Style Tankless
    Application Residential
    Product Dimensions (H" x W" x D") 25.75 x 18.11 x 8.66
    Product Weight (Lbs) 35
    Shipping Weight (Lbs) 37.0000
    Capacity @ 35 Deg F Temp Rise (GPM) 5.2
    Capacity @ 45 Deg F Temp Rise (GPM) 4.2
    Capacity @ 55 Deg F Temp Rise (GPM) 3.4
    BTU Rating 117000
    Maximum Input (BTUs) 117000
    Minimum Input (BTUs) 30735
    Altitude Test (Ft) 4500
    Temperature Range (Deg F) High to Low
    Venting Options Galvanized B-Vent
    Venting Diameter (Inches) 5
    Vent Maximum Run (Ft) N/A
    Water Connections (Inches) 1/2 NPT
    Activation Flow Rate (GPM) 0.6
    Water Pressure Rating (PSI) 30 - 150
    Energy Factor N/A
    Remote Control N/A
    Warranty 15-year limited warranty on the heat exchanger; 2-year limited warranty on all other parts
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  • Warranty

    Bosch gas tankless water heaters, electric tankless water heaters, electric mini-tank water heaters and accessories are warranted directly by the Manufacturer (BOSCH) through Bosch Thermotechnology Corp.

    Please visit the web site Warranty Page for the full details of the Bosch product warranty.

    Be sure to fill out your Warranty Card and send it to Bosch immediately after your installation to ensure you are registered for the full product warranty.
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