Some of the tankless units are listed for use this way .. but they have additional components. Then you move up to a combo boiler that will give you both DHW and Heat. The instant hot water heaters are not designed for constant use that occurs with heating a space.
There are also people who say you can use a regular tank water heater -- most are not rated for this use .. and many have very small burners (26k) ... so they don't produce much heat. Bradford White used to make a tank unit with an internal coil for a radiant hook up -- it was often used to heat bathroom floors or kitchen floors .. not the whole house.
I have a friend with a well insulated two car garage - he has been heating with a 40g tank heater for years -- So I know it can work. He doesn't need much heat -- some people install a tank water heater and the load is such that the unit never stops running.
What's the load on the building? Also -- be careful .. you need to have some way for adding water .. and a safety if the level should drop.
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APPLICATION
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