How to Identify an Anti-Scald Shower Mixing Valve

Written by stephanie cates
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How to Identify an Anti-Scald Shower Mixing Valve
Being able to identify an anti-scald shower mixing valve is an important skill in ensuring home safety. (modern faucet and sink detail with running water image by nextrecord from Fotolia.com)

Monitoring the temperature of water entering your home is necessary to ensure water safety for you and your family. Anti-scald valves used with water heaters are often called "tempering valves" or "mixing valves." An anti-scald valve mixes cold water in with the outgoing hot water to assure that hot water reaching a building fixture is at a temperature low enough to be safe. Identifying an anti-scald shower mixing valve is vital to ensuring safe water temperatures.

Skill level:
Moderately Easy

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Instructions

  1. 1

    Find the location of the water heater in question, in order to identify the anti-scald mixing valve. An anti-scald mixing valve can be installed at or near the water heater, or at the tankless coil or other hot water source, so that scald protection is provided even if the water heater is set to a high temperature.

    How to Identify an Anti-Scald Shower Mixing Valve
    An anti-scald mixing valve is often instilled at or near the water heater. (hot tap image by pncphotos from Fotolia.com)
  2. 2

    Search for a valve that has a temperature control knob, an input knob for hot water, an input knob for cold water, and an output knob for the tempered water. The anti-scald valve contains an internal temperature sensor which permits the valve to add cold water to the outgoing hot water in order to limit the temperature of the hot water leaving the valve.

    How to Identify an Anti-Scald Shower Mixing Valve
    Each anti-scald mixing valve has three input/ output valves, and one temperature control knob. (thermometer image by Dusan Radivojevic from Fotolia.com)
  3. 3

    Identify an anti-scald mixing valve by identifying the valve containing three input/output valves and a temperature control knob. If these parts are present, then you have identified an anti-scald shower mixing valve used to control the temperature of water coming from the water heater, and into the home.

    How to Identify an Anti-Scald Shower Mixing Valve
    An anti-scold mixing valve will help to control the temperature of water entering the home. (modern faucet and sink detail with running water image by nextrecord from Fotolia.com)

Tips and warnings

  • While these valves may show a target temperature on the valve setting knob, the actual water temperature that comes out of the faucet or tap will vary and may be hotter or cooler than the actual target temperature set.

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