I have been struggling with this decision. I have a converted coal burner with a hot water coil which to replace needs either a chimney liner or direct/power vent. I supplement with a wood stove and last year, which was warm in Maine, used about 700 gallons of oil after turning the setback down to 135, which made hot water scarce. I am leaning towards a Buderus with an indirect, but in looking at my fuel use does it make sense to spend the dollars? If I got a propane tankless water heater and set up the furnace with a Tekmar control I am thinking this would be faily efficient, and save a bunch of money. Also with condensing boiler technology becoming more available wouldn't it make sense to wait a few years to see what becomes the standard?
Thank you for any input.