The low energy use of the first Passivhaus in Bremen, Germany, is surprising, especially since the house has neither solar collectors, nor a PV array, nor a boiler.
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I have just built a house in Australia with an AAC floor. At 120lbs for 6ft by 2ft slabs, it is not lightweight. It is 3 inches thich with thin...
Like Dutch's post above, I would like to reiterate the fact that there is another solution: Wood Pellet Boilers. These are systems that connect...
Be sure to read the warranty on any solar thermal products.