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Old 08-19-13, 09:00 AM   #4
NeilBlanchard
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Right, that sounds very close to what I am hoping to find. I would just add a large enough tank to hold enough heat to 'bridge' the longest dark period and/or the capacity of the vacuum tubes to gather heat.

Combine it with a few solar PV panels, and you can have a carbon-free heating system.
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