On 12 Feb 2007 10:44:06 -0800, someone wrote:

First of all thanks for your various ideas and feedback. It eventually
became clear that the radiant heat was working just fine - the problem
was the level of insulation in the basement....... the time between
reheatings went up from every 4 hours or so to almost 12. Still takes
the same amount of time to heat back up, say 3-4 hours.

Glad ya got that figured out. You have what, nearly 15 cubic YARDS of
concrete to heat up, so it is no surprise that it takes hours!


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