Any one have experience with a water heater timer? I have an electric water heater, gas is not available at my house. I have been just switching off the breaker to the water heater. I turn it on for an hour, or two when I forget to switch it back off. I turn it on a few hours before bed then switch it off. I have hot morning showers for the next two days with the 50 gallon water heater off, for two people. I'm wondering if I should also shut the water off, so cold water doesn't refill and cool the stored hot water? I'm not sure if it only refills when the power is on or just refills as it is emptied. We have only been doing this for a few weeks, and I failed to note the meter at the start. It's a 5500 watt heater, and electricity is 12 cents a KWH. Also have time of use rates.