
Just like with any other power generating household device, excess electricity can be sold back to the grid to help the boiler pay for itself -- which should take no more than 5 years (depending on much you run your heater). Apparently, a company called Climate Energy has been selling boiler/generators since 2007. In the EU and Japan, mCHP boilers have a little more history. Where I live, it's a little too hot to think about running a boiler for more than 3 months out of the year, so my question is: can't we do the same thing with air conditioners?
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