Wondering if anyone out there has seen any information about using a standard, or high efficiency, LP domestic hot water heater as a heat source for a small radiant heating application? We have an application where a customer needs a temporary heat source for a small addition with a heat loss coming in at 28Kbtu's. There will later be a central boiler on site but the addition will need to be heated in the interim. We are thinking a 50 gal. high efficiency LP water heater, closed loop, providing no DHW (feeding the radiant only) may work. With the radiant loop containing only 7 gallons of water and most LP units coming in around 40kbtu input it may be doable but looking for input.
We are trying to avoid a small HE boiler for such a small space and a temporary setup.
Thanks, Mark