Interesting stuff from the Swiss, Ettringite concrete, reported below from DW TV. Concrete blocks are made which heat when exposed to water. Copper pipes are threaded through the blocks, which act as a heat exchanger. The hot water then circulates through the house, heating it.
DW TV Video
It would take only a few blocks to heat an average size home all winter. Would these blocks last? It appears they will, at least as long as the home will, which has got to be something worth considering. Are they expensive to produce? Simple answer - I don't know, but the process looks a little complicated, the blocks heat up when made, can they explode if you get the recipe wrong?
One of the guys featured in the video can be found here...
Frank Winnefeld of Empa - the Swiss Federal Laboratories for Materials Science and Technology
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