The basement stays cool, probably upper 50s in winter. That 1000w heater keeps the tank at 78. The electric bill is about the same in winter as it is in summer with the air conditioning running. The hvac is all new Lennox equipment. 2 years old.
With all the space in that room, maybe you could build a Joey style 540 gallon tank and have it just sit out in the middle. You would just need two 6' tanks to take apart and then use the four 6' pieces to attach to a plywood base. If you want to try something like that, there is a video series where
joey02 shows the steps on how build the tank. I really hope to be able to do this someday.