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GrowingCoastal · December 24, 2018

I knew someone who buried a waterbed heater in a few inches of sand on top of a greenhouse bench. It worked well.

December 24, 2018	#22
GrowingCoastal Tomatovillian™ Join Date: Jan 2016 Location: Vancouver Island Canada BC Posts: 1,253	I knew someone who buried a waterbed heater in a few inches of sand on top of a greenhouse bench. It worked well.