Dee, Unfortunately we have common greenhouses without heating, but I know some people around us who use the same system as you have mentioned in their greenhouses.
But it's more ordinary for us to use a wood-powered brick stove built in our dacha-house. Almost of all of the houses located in our garden community are using such house-heating systems. We have it as well 
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1 kg=2.2 lb , 1 m=39,37 in , 1 oz=28.35 g , 1 ft=30.48 cm , 1 lb= 0,4536 kg , 1 in=2.54 cm , 1 l = 0.26 gallon , 0 C=32 F
Andrey a.k.a. TOMATODOR
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