Water Heater Repair in Knoxville, TN
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Knox County winters put a water heater to work for months
Water coming into the tank runs colder from October through April, seven months here, and the unit has to work harder to bring it up to temperature. On nights that average 31°F, that means more cycles on the burner or heating element, and that wear tends to show up first in the thermostat or the element itself. You notice it as water that takes longer to heat or does not stay hot as long as it used to.
Power loss is part of the picture too. Knox County has seen 13 winter storms and 181 damaging wind events over the past ten years, and statewide, 20% of households went at least 24 hours without power in 2024. Most water heaters come back on by themselves once power is restored. If yours does not, that is worth a look.
- 31°F
- the average winter night, and colder incoming water means longer heating
- 7 months
- October through April, the months homes here need heat
- 20%
- of Tennessee households lost power for a day or more in 2024, and a heater with an electric element or electric ignition stops without it
NOAA nClimDiv, 1991–2020 normals
A new water heater would cut about $280 a year off hot water for a typical Tennessee home.
Estimates for a typical Tennessee home, compared with an older unit built to the federal minimum, from EIA household energy data and Tennessee fuel prices. Your home will differ.
Repair makes sense when an element, thermostat or gas valve has failed.
Replacement makes sense when the tank itself is leaking.
- Why is my water heater leaking from the bottom?
- Most of the time this means the tank itself has rusted through from the inside and is starting to fail. Sediment builds up at the bottom of the tank over the years, and once it wears through the steel, water gets past the liner. It can also be the drain valve or a fitting that has loosened, which is worth checking before assuming the worst. A tank that is leaking from the bottom seam or the tank wall itself cannot be patched. It needs to be replaced.
- Why won't the pilot light on my water heater stay lit?
- A pilot that won't stay lit is usually a sign the thermocouple has worn out. That's the small sensor that sits in the flame and tells the gas valve it's safe to keep the gas flowing. Once it can't sense the flame properly, the valve shuts the gas off as a safety measure, even though the pilot lit just fine. A dirty pilot orifice or a draft blowing on the flame can cause the same thing. A contractor can test which one it is and replace the part.
- Can a tankless water heater be repaired?
- Yes, most problems with a tankless water heater are repairable. Mineral scale buildup on the heat exchanger is common and can be flushed out. Igniters, sensors, and the flow sensor that tells the unit when water is running can all fail on their own and be replaced without swapping out the whole unit. A contractor can diagnose what's actually failing before you decide whether repair or replacement makes more sense for your unit.