Member Since: 08/30/2012

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Re: What's the Best Way to Heat a Small Greenhouse?

I have just finished my 9x8 greenhouse (leanto) and have built a heat sink into the floor this consists of a 1 metre x 1 metre x 1 metre deep hole insulated and a gridwork of pipes layed in the bottom with holes drilled in the top .i then placed 2 litre bottles of water on top and layed barley straw between all the layers of bottles had 6 layers in total the whole lot is then sealed with insulation and a small port left so the heat can escape at night which is sealed during the day .then i ran a 3 inch pipe connected to the gridwork of pipes up into the roof of my greenhouse where the warmest air is and connected a 12volt fan to the pipework this is powered by a 40w solar panel on my greenhouse roof and connected to 2x 12volt 150Ah batteries connected in parallel to a 12volt regulator .
In the evening when the sun goes down i open up the port from the insulated chamber and the fan in the greenhouse roof circulates the air inside the greenhouse and blows the warm air from the sealed chamber into the greenhouse and keeps recirculating all night .results look promising at the moment ,but im waiting for winter here in the UK too see the real results .will keep you posted .