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Hi Who,
I guess thermosiphoning works great, but the main disadvantage is the storage tank needs to be above the heat source.
Unless I want a 55 gallon drum on stilts in my livingroom, that isn't going to work.
I was thinking that a water tank in the crawl space with some sort of partially open top would work for both thermal mass and pressure control.
Then all I need is a pump and some tubing to run to the places I want warmed.
Thanks for the comment on the "non-ferrus" pump. I remembered you have to do something a little different for an open loop system, but I couldn't remember what.
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