What's the best heater to buy for my greenhouse.
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It depends upon where you live....
Get the Solar Greenhouse Book by James C. McCullagh to see different ways to conserve heat in a greenhouse. What will you do if there is a late freeze and the electricity goes out? Another good book is Greenhouse Gardener's Companion by Shane Smith.
Heat sinks, 55 gal. drums painted black, heat absorbing floors, wood burning stoves or an electric heater - which, BTW, can get very expensive if you want to keep it at 50 all the time. I hope your glass is not the new coated glass that will keep put the sun's rays. If you are starting seeds, get grow lamps.
We have the oil heaters and we love them. I wonder if they would work in your greenhouse?
I use in my greenhouse a little cube heater, and the oil heater is expensive to run, but would work too. I also have a plastic 45 gal drum that works like a hot water bottle inside. Warm water for all seedlings.
I use a kerosene heater. I don’t recommend electric, because if it runs all night, it burns out the unit.