I purchase one of these to seed some early tomatoes in a 2'x3' plywood bed in a heated green house. Buried it in about 3/4" of damp sand with seeding pots on top of it. Unless the pot is sitting directly on top of the orange cable, (which there is only 6' of, the other 6' us the black power cord that does not heat), there is not heat transferred. The first couple of feet heat more than the last couple. The last coupe of feet of orange cable does very little heat. It also does not provide enough heat to heat the sand two inches from the orange cable. Basically useless, I place 40, 2"x2" seeding pots on it and only about a 1/4 of them actually have warmer soil in them. Soil temps are 67F in a large portion, 74F in the center couple of rows where they are directly on the cable and 81F in one corner where the first section of orange cable starts. So, at this, I might get early germination on about 25% of my seedsRead full review
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