Well, out of frustration I decided to try building a Babington burner, right off it worked well, and yesterday after reworking the plumbing, to suit the new burner, YAHOO we heated the hot tub using veggie oil. To bring the temp up from 92 deg F to 104 deg F took about 2.5 hrs, compared to the 2 hrs it would have taken using propane. Best of all, the fuel is free, except for costs for collecting. will provide pics soon.
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