In essence, your "mining" electric is free 'till you get to the point you have more heat generation than you need.
1300 watts isn't 5000 BTU but it's fairly close, works out to more like 4400ish.
Last winter, my mining farm (at the time a mix of some A2s, some S5s, a single SP20) and some computers I used for non-mining purposes generated enough heat to make me keep 2 windows OPEN at least a crack all winter in a older mobile home with VERY POOR insulation.
I also had a "time of day" rate there that made electric usage somewhat CHEAPER for heating than natural gas about 65% of the time, and only a LITTLE higher the rest of the time (I DID have a "high efficiency" furnace thanks to a Federal weatherization program but I never needed to fire it up that winter).
I anticipate a similar situation where I'm at now, though the mix of miners has changed somewhat and the place I'm in now bigger but a LOT better insulated (for the most part).
There are MANY areas that traditional gas-fired HVAC is NOT cheaper than electric heat - and miners are a lot more likely to LIVE in those areas. Natural gas isn't even AVAILABLE where I live 'cause the Electric rates are so cheap as to make gas non-competative.
Yeah you are right about the btus it is closer to 4400 then 5000.
Still comes to over 100000 btu of heat for 11 cents that is dirt cheap.
My real winter power cost is 11.9 cents a kwatt.
I get so much heat from my miners my gas power bill drops from 200 a month to 75 a month.
I adjust my winter rates for calculation from 11.9 to 8.9 cents.
Just for the savings on heat
This is amazing and surely is very beneficial. You can mine alt currency too and trade in it or invest. You saved lots of money and you can even sell the money coins to help pay for the eletricals bill. How many watts per hour are you guys using ? I need to compare prices.