The 50 gal tank in my water heater is leaking and I'd like to select a conventional gas replacement that minimizes my up front costs plus operating costs over the next 10 years.
I see that Rheem has two high efficiency series water heaters (Professional and Fury) that have .67-.68 "Energy factor". What is this?
The high efficiency GE SG50T12AVG is advertised to use 242 Therms of energy a year. If I know the BTUH rating and energy factor, can I calculate Therms?
For conventional gas water heaters, is better insulation the major difference between a standard model and a high efficiency model?
My wife suggested buying an insulating blanket that fits snugly around the tank to reduce heat loss. I'm guessing that if this would help, the manufacturer would have already added the extra insulation for units they market as high efficiency. Can anyone confirm that her idea will actually reduce our gas bill?