Join Date: Jul 2002
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A, it seems you are asking two separate questions. Re: Eberspracher/Espar operation generally, they make both heated water and heated air systems. The techs I''ve talked with work much more on the water systems, and recommend the air system for longevity. These were redesigned some years ago to due a start-up cycle with far less current draw (which used to be a performance problem when boats were out on the hook or without a dock plug); that was problem we had with ours. Operation is dead simple (adjust the thermostat; turn it on/off) and the heated air is usually drawn from within the boat and is sealed from the combustion process, so it is safe and without odor.
The only integration with an existing HVAC system I can imagine is share the ducting. How easy/hard that is to arrange will depend on the given boat, ducting arrangement, and no doubt will involve some kind of flapper valve, since both systems will have their own air blower motors that are integrated into their respective control circuitries.