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How Can I Increase the Heat in My Water Heater?

Published in Water Heaters 3 mins read

To increase the heat in your water heater, you'll need to adjust the thermostat(s). Here's how:

Steps to Adjust Your Water Heater Thermostat

  1. Locate the Access Panel(s): Find the access panel(s) on the side of your water heater. Most electric water heaters have two panels, one for the upper thermostat and one for the lower. Gas water heaters might have only one.

  2. Turn Off the Power/Gas: Before proceeding, crucially turn off the power to an electric water heater at the circuit breaker. For a gas water heater, turn the gas valve to the "Pilot" setting. This prevents electrical shock or gas leaks.

  3. Remove the Access Panel(s): Use a screwdriver to carefully remove the screw(s) holding the access panel(s) in place.

  4. Peel Back the Insulation: Gently peel back the insulation covering the thermostat(s). Be careful not to tear the insulation, as you'll need to put it back later.

  5. Adjust the Thermostat(s):

    • Locate the thermostat(s). You'll typically see a dial or a screw for adjustment.
    • Use a flathead screwdriver to adjust the thermostat to your desired temperature. A safe and recommended temperature is 120°F (49°C) to prevent scalding. Do not exceed 140°F (60°C)
    • If your water heater has two thermostats, adjust both to the same temperature.

  6. Replace the Insulation: Carefully replace the insulation over the thermostat(s).

  7. Reattach the Access Panel(s): Screw the access panel(s) back into place.

  8. Turn the Power/Gas Back On:

    • For electric water heaters, turn the circuit breaker back on.
    • For gas water heaters, relight the pilot light according to the manufacturer's instructions, then turn the gas valve to the "On" position.

  9. Wait and Test: Allow several hours for the water to heat up before testing the temperature at a faucet. If it's not hot enough, repeat the process, making small adjustments each time.

Important Considerations:

  • Safety First: Always turn off the power/gas before working on your water heater.
  • Scalding Risk: Setting the temperature too high can cause scalding. 120°F (49°C) is generally considered a safe and effective temperature.
  • Energy Consumption: Higher temperatures increase energy consumption.
  • Legionella: Maintaining a temperature of at least 140°F (60°C) periodically can help prevent Legionella bacteria growth, but scalding risks increase substantially at that temperature. Consider a periodic shock treatment instead.
  • Professional Help: If you're not comfortable working with electricity or gas, consult a qualified plumber or electrician.

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