Two methods of controlling hot water temperature
1 of 3
Photo 1: Mixing valve
Cut the copper pipes at your water heater and reroute them through a mixing
valve. Install a temperature gauge in a tee fitting near the valve to set the output
2 of 3
Photo 2: Tempering valve
Install a “point-of-use” tempering valve
below the sink. Shut off the supply valves and disconnect
the existing supply tubes. Add the tempering valve and two new supply tubes.
3 of 3
Turn on the hot
water and adjust the tempering
valve to obtain 104
degrees F. or less.
If your home is plumbed with copper
pipe, you can install a mixing valve
right at the water heater and set the
maximum temperature to 104 degrees
F. You may still get some temperature
variations due to fast changes in
water pressure (such as from a toilet
or a washing machine), but there will
be no chance of scalding.
But before you break into any
pipes or buy a water heater mixing
valve, ask your local building inspector
if your code requires “point-of-use”
tempering valves at each faucet.
These valves may
be cheaper than installing temperature-regulating faucets.