backup hydronic heat source?
Looking for info on inexpensive backup heat source for hydronic radiant floor in 800 sg'(two floor) super insulated passive/active solar addition. Worst case heat demand 4,000-5,000 Btu/hr. Elec Coop won't allow off-peak storageelec water heater as not UL boiler rated. Elec Storage furnace, heat pumps boilers all costly for a small heat demand. If the government wants to spur sustainable homes they should be supporting development of affordable backup systems. Ideas?
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