Just curious, why preheat on propane? Costly. If anything I finish on propane only if we have a lot of sap easier to extract a couple of gallons of near syrup and continue to boil on the wood heat
Homemade 46 by 26 wood boiler with two polished stainless pans
Home made sugar shack with Caputo Rooftop
15 gallon pre-heater tank with a circulating copper pipe stack heater.
two 45 gallon storage tanks with transfer pumps
150 taps (buckets)
Arctic Cat Prowler
Two big reds with bucket holders to collect the sap
Good wife to assist me
Getting sweeter one drop at a time.