Posted by Sundug on November 4, 2007, 1:02 pm
Sorry, I thought you were asking about domestic hot water use. Doug
Posted by DoHop on November 4, 2007, 7:11 pm
Posted by Jeff on November 6, 2007, 3:19 pm
How much does it take to heat now? Find the number of therms.
You can find solar data here:
<URL: http://rredc.nrel.gov/solar/old_data/nsrdb/redbook/sum2/14898.txt />
Figure roughly 45% efficiency. Less on really cold days and variable
depending on collector. A good evacuated tube will hold efficiency
better than a good flat plate.
Radiant heat is ideal for solar.