I was reading not long ago that conventional residential water heaters use 14% - 30% of the home's total energy. Quite a variation, but I guess that is dependent on family size and how clean they keep themselves.
Of course, the obvious solution is a tankless water heater, but as it turns out, you can use a solar water heater to feed a tankless or on-demand water heater, reducing power consumption even more.
So what's the difference between active and passive? Basically, active is a more complex mechanism and does better in regions that get a lot of hard freezes. Passive models are more on the low maintenance scale.
Solar energy technology was supposed to be a big focus of the Obama agenda, but I haven't seen it yet. And oddly, solar water heaters don't qualify for the energy tax credit, but oil, gas, propane, and electric ones do. Oh well, it just goes to show; there's no Czar of Logic in Washington!
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Anyone who purchases a solar water heater can receive a 30% tax credit. Also, tankless water heaters frequently use more electricity than conventional electric water heater. Imagine using a coffee maker to heat the water for your shower, the concentration of electricity that requires is enormous. Typically it requires two or three 60 amp breakers to power a tankless water heater.
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