Actually 4.3 tons is much closer to 23,000 KWH
Electricity: 23,000 x 3,412 = 78,476,000 BTU's
Anthracite Coal: 8,600 lbs (4.3 tons) x 12,150 BTU's/Lb. x 0.75 (efficiency) = 78,367,500 BTU's
I toss away 1 ton during the non-heating months just keeping the fire going in the boiler (which is used for DHW).
And this year is so cold that it will certainly take well more than 23,000 KWH's to both heat our house and provide for year round DHW, which will require the remaining 5 tons.
Last edited by lsayre
on Tue Feb 11, 2014 7:07 am, edited 1 time in total.