Rossymcg

Good idea. I'm investigating the idea of fitting a heat exchanger in the mix. You think it could work? One question the belimo, is there an automated switch that detectes the pull of current through the cable feeding the hood and switched it on? TIA

thanks for that.

OK never mind. you happy with that?

I'm building a house in Poland, it will be insulated and airtight to passive standards. The design is for 200mm EPS and 250mm of concrete(it's a raft foundation) how did the 250mm of concrete heat up in the end