just get a lot of 5 gallon buckets and paint them black then fill them with water and stack them along the walls of the greenhouse below the plant shelves. Will accomplish the same thing and give you heat all night when you need it by soaking up the heat when you have too much and releasing it at night when you need it.
Save the doors for a cold frame for next spring and sell Vegetable plants.
If your greenhouse has clear window panels already you shouldnt need the doors. Not totally clear on what you are doing. Are you heating the greenhouse or just making hot water? Or are you wanting to use hot water to heat the greenhouse? In order to make a hot water system you will need alot of copper or some old radiators that you can convert. Hear is a book you can look at or even download.
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just get a lot of 5 gallon buckets and paint them black then fill them with water and stack them along the walls of the greenhouse below the plant shelves. Will accomplish the same thing and give you heat all night when you need it by soaking up the heat when you have too much and releasing it at night when you need it.
Save the doors for a cold frame for next spring and sell Vegetable plants.
If your greenhouse has clear window panels already you shouldnt need the doors. Not totally clear on what you are doing. Are you heating the greenhouse or just making hot water? Or are you wanting to use hot water to heat the greenhouse? In order to make a hot water system you will need alot of copper or some old radiators that you can convert. Hear is a book you can look at or even download.
Sunshine to Dollars by Steven Harris. You can go to http://www.KnowledgePublications.com for a download. Great book with some great ideas.