Originally Posted by Heaterguy
And I don't know where you get your figures at because I have a lot of positive feedback about energy usage.
I had an elec. WH that ran on 240v. I got an analog 120v clock and hooked it up to the 240v heater element through a dropping resistor to give me ~120v.
As is, with using no hot water, the heater ran 5 min. out of every 5 hrs (300 min) to offset heat loss through the insulation. This is 4500w(5/300) = 75w.
After I wrapped it with addt'l insulation it ran 5 min. out of every 7 hrs, giving 54w.
The tanks nowadays are probably better insulated.
The avg. US elec. usage is 1 kw, up to 4 kw, depending on where you are.