[_delirium]

I've considered doing this manually, but when I ran the numbers, it barely saved anything, at least if your water heater is insulated to modern Energy Star standards. In the past decade or two, standby losses have been brought down so low that they're almost negligible compared to actual hot-water usage, e.g. one shower will take more energy than a whole month of standby heating.

When I looked into it in my own case, it worked out to slightly under 1 kWh/day in standby losses, or about $2/month. I turned off the water heater when I was gone for a month once, and the savings do seem to have been in the noise somewhere. Assuming a Nest-like device to do that for me would cost the same ~$250 that a Nest does, it would take 20 years to recoup the cost of the device, even assuming it was so perfect that it saved all standby losses.

[dfc]

Nice. How did you estimate the standby costs? I wonder if gas v. electric makes a difference? Any chance you live in a colder (40 degree basement in winter) climate?