> we should be heating our hot water tanks, swimming pools, or anything else that needs concentrated heat That comment about swimming pools nearly made me leap

> we should be heating our hot water tanks, swimming pools, or anything else that needs concentrated heat That comment about swimming pools nearly made me leap out of my chair. I was already convinced to get a heat-pump, but I was just planning on putting excess heat under the frost-line to save it for winter. To think, if it was insulated and disinfected properly, you'd have both a cheaply heated pool, and a huge thermal-battery.