With oil....only an indirect tank. What is the propane being used for?
I am trying to help my father choose a new oil fired hydronic system. He has spoke with 2 different companies, one suggest buderus with stackable tank and other system 2000. He is confused which way to go... He lives in cold northern Maine but is south in winter burning about 1100 gallons a year. 2 people live in the home for hot water use. He currently has propane storage. Nobody has suggested an on demand water heater. Any thoughts on the systems or indirect vs on demand?
With oil....only an indirect tank. What is the propane being used for?
Being a solar and a boiler guy, I would say to put in a solar water heater which will give you all the heat you need for the summer months when the oil boiler does not need to work, then use the boiler with an indirect tank to give the hot water for the winter. This will mean no or almost no fuel bill during the summer months and the most efficient use of the boiler in the winter months.
The cost of propane is probably a bit more than oil per btu and oil is not very efficient when only starting the boiler for DHW.