Yeah, debs I would probably opt to save the $50 extra bucks myself. I wonder why both of these places only cary the 4 gallon heater now - the one I got last year is just a 2 gallon and it seems they don't carry those anymore.
Either way, electric just seems like a better idea to me. Propane in a greenhouse just makes me nervous. I know it's clean burning, but still...The nice thing about the electric heater is that it's so small you can just stick under a bench or behind a large plant or whatever and forget about it.
The other thing to remember is that the electrics also have a thermostat and I don't think mine goes below 80. At first I thought that wasn't going to work, but what you have to realize is that the water is only going to be 'hot' for a couple minutes as new cold water will immediately start flowing into the tank and mix in with the 80 degree water and cool it down. If the water is initially too hot, I just spray it on the floor for a minute and wait for it to get to a comfortable temperature. I initially had to play around with the thermostat for a few days before I got it right.
Incidentally, I spoke with another guy in my area this summer that has the same electric heater I have in his greenhouse. He also swears by it.
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