Gary this set up is only for radiant heating I installed .. but could also be used for Domestic Hot Water and with a small heat exchanger ..... you can use it for both. The sellling point is there is no storage and maintaining a hot water tank ... and it is direct vented out the side of the garage and in the same flue pipe it brings in combustion air which on its way in is heated by the exhaust air ...for combustion ..they claim about 95% efficiency. +\- ...
Ron
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