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Old 08-02-20, 10:50 AM   #7
Helper EcoRenovator
Join Date: Dec 2019
Location: Northern Utah
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The other problem with oil is messy leaks. There will always be a leak at some point.

I ran an open tank hot water setup in my greenhouse a few years back. Water temp was 100F. The opening was pretty large since it was basically a blue barrel with no lid. I did not have to much water moisture issue in the air. Of course, every situation is different and your water temps are much higher. I would consider redesigning the system for lower temps since it is much more efficient. Hard water is more of an issue and oxygen if you have an ferrous metals in the system, especially if its vented to atmosphere. At those temps, you really should have a sealed system.

My frost line is about 19" and almost every house around here has a basement. Mine is not insulated. It was built in 1972
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