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What is a thermostatic mixing valve?

A thermostatic mixing valve (TMV) blends hot and cold water to deliver water at a controlled temperature. At home, fixture protection differs from temperature control at the water heater: an ASSE 1017 distribution valve alone does not provide adequate scald protection. Ask which application and flow requirements the proposed valve serves.

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By InstaBids editorial team with AI research agents. Updated

What this means for your home project

  1. Find the proposed valve’s installation instructions and ask the installer to identify the procedure they will follow before work starts. Source: US EPA, read 2026-11-02.
  2. Ask the installer to state in writing whether the distribution valve will sit at or near the hot-water source; compare that proposed location with ASSE’s guidance. Source: ASSE International, read 2026-11-02.
  3. For a shower job, request the showerhead flow and the valve’s published minimum flow in the written scope; the showerhead value must meet that minimum. Source: ASSE International, read 2026-11-02.
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What is the difference between ASSE 1017 and ASSE 1070?

ASSE 1017 concerns temperature control at the hot-water source; ASSE 1070 concerns limiting water temperature at fixtures such as sinks and bathtubs. The ASSE guide distinguishes these applications: a distribution valve alone does not provide adequate scald protection. The 1070 section permits further mixing at the fixture. This is application guidance citing the 2009 and 2015 standards, rather than a statement of the code adopted at your home. “Further mixing downstream is allowed.” Source: ASSE International, read 2026-11-02.

What is the difference between a thermostatic valve and a pressure balance valve?

Pressure balancing responds to changes in supply pressure, such as when a toilet flushes. Thermostatic shower valves respond to changes in incoming water temperature. PMI says some thermostatic models also compensate for pressure changes; ask which behavior the proposed shower valve provides. “Thermostatic shower valves maintain comfortable outlet temperatures, even with changes to the inlet water temperature.” Source: Plumbing Manufacturers International, read 2026-11-02.

Why put a mixing valve on a water heater?

A mixing valve can separate hotter storage from cooler delivery. CDC says 130°F–140°F storage can kill germs such as Legionella while increasing burn risk. Its home guidance calls for mixing hot and cold at the tap above 120°F and discussing higher heater settings with a healthcare provider. “Keeping your home water heater between 130°F–140°F can kill germs like Legionella in water, but also increases your risk of burns.” Source: CDC, read 2026-11-02.

Why do TMVs need servicing?

Maintenance helps prevent a valve failure that could expose someone to scalding water. CDC states this explicitly in its healthcare guidance; that guidance does not establish a home servicing interval. For a home installation, EPA directs owners to the manufacturer’s instructions or professional installation. “Valve maintenance is especially important in preventing valve failure, which can result in scalding.” Source: CDC, read 2026-11-02.

What thermostatic valve should I use? I have installation size DN25.

Choose by application and required flow, rather than pipe size alone. ASSE says distribution valves must match system flow requirements. For a shower, compare the showerhead’s flow with the valve’s published minimum; ask for those two values in the written scope. “The showerhead flow rate must not be less than the manufacturer’s published minimum flow rate for the valve (device).” Source: ASSE International, read 2026-11-02.

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