Yeah, I was thinking a little more exotic.
Since evacuated tube collectors can achieve tempertures of 350 degrees, why not use some type of oil instead. In a thermal storage system, you would not have worry about it boiling off and or high pressures. The oil could be stored in a highly insulated tank then pumped through base board heat exchangers.
I realise that it is alot more expensive than using water but the ability to store 60% more btu's in a same sized system is attractive.
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