Well if there is that much water to pump out id say you have bigger problems, it s ok to leave plugged in if you have a float switch to turn it off and on automatically
SOURCE: Hot Water Overflow
Do you have an expansion tank tank in the line leading into water heater? If not what is happening is that the water is no longer allowed to go back into the city supply. You said that you had turned it off while you left so the water heats up and has no place to go so the preasure/ temperature P/T valve opens and lets out the excess water from the expanded supply (heater water) that has no where else to go. It used to be that the extra expanded water just backed up into the supply pipe and back into the main. That is no longer possible in most places by the National Plumbing code. The answer may be to install the expansion tank into the incoming line. You can see then now at all hardware stores where water heaters are sold.
SOURCE: 3rd yaco 006 in 3 years hot h20to hot
Taco circ. should be bronze in color for domestic applications. If it is green, it's wrong. Average temp for hot water should be 120 degrees. Overheating of circulator may be the cause of premature failure.
SOURCE: i switched off the power to my electric rheem 142
Turn power off to water heater at breaker panel, remove cover where electrical cord is, and check behind it for thermostat, with red button in center, push it in to reset. It may have tripped for some reason when power turned back on to it. Do you have a multimeter, to test for power at heating element?
SOURCE: Top heating element was broke. Replaced got hot
look for a badly connected power line ont he bottom element, or any connection upstream of the power terminals. voltage readings usually drop to that range when you only have one side of the 220v circuit connected.
SOURCE: Excess Hit Water Bill from Solar/electric Hot Water System
10-30-12
Cost calculations for recirculation system vary widely.
These systems cost more, and they cause higher operation cost of water heater.
1) When pump is OFF, then hot water is no longer leaving the tank.
Most recirculation systems have choice of timer for setting specific times of operation, or thermostatic operation that activates pump when sensor detects temperature less than 90 degrees
BUT...
2) Condition of plumbing is suspect here because you are not receiving fully 90 degree hot water from the recirculation system.?.
Bad single-handle faucet cartridge, or bad recirculation check valve, are causes of crossover. Clean recirculation check valve with white vinegar. Replace worn faucet cartridge.
Test for crossover.
http://waterheatertimer.org/Crossover.html
3) There are other suspects, such as water leak.
Drips, broken pipe, bad TP valve.
Turn off all taps and put ear against pipe to listen for running water.
http://waterheatertimer.org/How-to-troubleshoot-electric-problems-with-water-heater.html#listen
4) High costs: Lifting single-handle faucet in middle will immediately cause cold water to enter tank. Even if no hot arrives at tap, because the cartridge is drawing both hot and cold in equal amounts when handle is lifted in middle.
Today it is more efficient to install dual-handle faucets so tank is not receiving constant dose of cold water when single-handle faucet is not used correctly or tediously.
http://waterheatertimer.org/9-ways-to-save-with-water-heater.html
If you need further help, I’m available over the phone at https://www.6ya.com/expert/gene_9f0ef4df2f9897e7
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