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Concrete in-ground tubs take a large amount of wood and a very long time to heat up compared to cedar tubs of a comparable size. Even with the closed cell foam surronding it, there is a large loss of heat into the concrete. A standard size cedar tub, 6' x 3', with our large stove heats at the rate of about 30-33 degrees an hour. Also, the keyhole design, while a nice touch from the standpoint of keeping the stove out of the occupant area, tends to trap the convection currents which move the heated water to the other areas of the tub. This could be alleviated by using a small pump to circulate the water around the stove and out into the occupant area.
In the interests of full disclosure, I am affiliated with the Snorkel Stove Co.
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