Marilyn & Bob wrote:
Actually, you have a third alternative. Buy the 40 gallon gas water heater,
but don't bypass your tankless. Feed the gas heater with the output of the
tankless. This will significantly cut down on the gas cost for the water
heater during the heating season, yet allow you to turn off the boiler in
the summer.
--
Peace,
BobJ


dont bother with a tankless, they cost way too much to buy.

i still think you should replace the furnace with a natural gas unit,
but if your commited to just the hot water tank go with a 40 gallon
natural gas....