backup hydronic heat source?

Drake · 01-22-11, 07:20 PM

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?

01-22-11, 07:20 PM	#1
Drake DIY Guy Join Date: Jan 2011 Location: Mpls,MN Posts: 315 Thanks: 2 Thanked 17 Times in 17 Posts	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?