I'm only running a 55 gallon tank. We set the thermostat fairly high throughout the day while we are gone (82) and a bit lower when home (77). My bill was $42 last month. We just moved into this house and were trying to figure out what our power bills will be. Perhaps my wife and I are stingy, but I've never seen a power bill for more than $80. Perhaps it has to do with cheap energy costs out here in the PacNW.