Check out a small propane heater, one with a pilot and a thermostat, far more dependable and that is the most important part. For my RO room I installed an 8000 BTU propane wall heater, direct vent. It has never failed. Mine happens to be on a bulk tank but you could just as easily run one off a 20# tank or even better 2 with an auto switch over when one gets empty. On mine I do have electric for back up but the propane so far has never failed. I have the propane thermostat set at 45 and the electric set at about 40-41 (or whatever it's lowest setting is on the electric space heater. My electric is run from my solar system/battery bank so even if the grid goes out I still have power.
Dave Klish, I recently ordered a 2x6 wood fired evaporator from A&A Sheet Metal which I will be converting to oil fired
Now have solar, 2x6 finish pan, 5 bank 7x7 filter press, large water jacketed bottler, and tankless water heater.
Recently bought another Gingerich RO, this one was a 125, but a second membrane was added thus is a 250, like I had.
After running a 2x3, a 2x6, 3x8 tapping from 79 taps up to 1320 all woodfired, now I'm going to a 2x6 oil fired and a 200-425 taps.