Hi I just bought a big house has 3300sqft . House has oil hot water boiler that feeds my hydro forced air units and it also feeds a 80 gallon holding tank for our hot water. I'm thinking about ditching the 80 gallon holding tank and getting electric hybrid hot water tank to save on oil . But also looking into options to heat my house been here since October 2019 it has 330 gallon tank and already had to fill it 3 times and hasn't even been that cold here in Massachusetts. not much room to add on so wondering what my options are for wood burning boiler I'd like to keep my oil for back up but dont really have room for 2 units . Any good combo units for my size home that good .