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Question DetailsAsked on 12/15/2015

I have a 115 gallon hot water tank we just replaced both heating elements & both thermastats on it how long will it

I've got 115 gal hot water heater tank that has just had both heating elements replaced & both
Thermostats how long will it take for it to get warm

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1 Answer


Depends on your incoming water tem, surrounding room temp, temperature setting, and to a very large extent the power input from the heating elements - but very rough numbers, probably 1-2 hours to get to room temp, total 2-3 to feel warm (like for hand washing), and probably about total heating time of 3-5 hours to get to the point where it shuts off because it has reached the 125-140 degrees - whatever your thermostats are set for. With two separate thermostats sounds like maybe a high-recovery and fairly high efficiency unit, so likely not more than about 3-4 hours to full heat from cold out-of-the-ground water temp - half that if a high-wattage energy guzzler like those supplied for motels and such, which for that size heater would likely be far more than half your household power draw - probably about 30KW (dual 125A breakers), so that is not likely, but I have seen it in larger homes.

This assumes of course that the thermostats have been turned up - remember hearing about one case where the contractor and homeowner went back and forth on the phone for days (very remote job site) about a water heater not heating up - and each time he asked if the thermostat was turned up and the homeowner said yes, to normal temp they have always used. After the better part of a week of daily calls he told the customer to turn the thermostat down to the lowest setting, then back up - customer said the thermostat would only go down to 50. Turned out they were adjusting the furnace thermostat, not the water heater one, which was sitting on OFF or Vacation or whatever the lowest setting was.

In your case, not only helps to have the two thermostats turned up to your safe operating range, but also make sure the breaker(s) was turned back on after installation was completed.

Answered 4 years ago by LCD

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