Not a lot of difference as far as the home owner is concerned from the 1600H model. This is as stated, a single appliance water heater and with all tankless be aware the actual performance varies widely depending on in fluent water temperatures and gas availability. You can not replace this where your old 40 gallon sat using the same 1/2" gas and vent. It requires a 5" type B vent, 3/4" gas and a .6 gallon per minute flow. It does have a rather poor design on the hydro generator that is susceptible to the most minute particles causing it to fail to create the voltage needed to spark and ignite. Its advantage if you do not have power and want a model that does not have a standing pilot, this is ideal. There is no freeze protection and it can be damaged by cold winter down drafts and not a good candidate for areas that experience freezing temperatures. Unless you have a manometer and multi meter to check values, you can not work on this your self if service is needed and don't expect most plumbers to have them either.
Bosch does not have anywhere nearly enough trained service personnel to field support their products and their installation manuals are not a help here.
Due diligence is a must before buying any tankless water heater. Call their technical support and ask yourself, do I want to spend this much time waiting for help if and when the time comes? At the end of the day, it's all about service. Take it from a former Bosch Authorized Service Provider...
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Product Description:
Bosch Tankless Water Heater 425HN NG Water Heater Gas Tankless Water Heaters Tankless Water HeaterGas Connection 3/4 InNatural Gas TypeInput 11
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