22mm thermostatic mixing valves (TMVs) are designed to automatically blend hot and cold water to deliver a safe, stable outlet temperature. They’re a vital component in any plumbing system where scald prevention and user comfort are priorities. By regulating temperature at the point of distribution, TMVs ensure consistent water delivery even when supply pressures or temperatures fluctuate.These valves are ideal for domestic bathrooms, healthcare facilities, schools, and commercial environments where user protection is essential. With a 22mm size, they’re suitable for higher flow rates and integrate easily into standard pipework. Many models meet TMV2 or TMV3 standards for safety-critical environments and are WRAS-approved for use in potable water systems.

Key features and benefits of 22mm Thermostatic Mixing Valves.

Key Features

The built-in thermostat adjusts flow from hot and cold supplies to maintain a consistent outlet temperature. This protects users from sudden hot water spikes or cold surges.

Key Features

Instant shut-off occurs if the cold water supply fails, preventing dangerously hot water from reaching taps or showers. Ideal for environments with vulnerable users, such as children or the elderly.

Key Features

Even under varying system pressures, TMVs deliver stable and reliable temperatures. This ensures a safe and comfortable experience at every use point.

Key Features

Most TMVs include an accessible dial or screw for fine-tuning the output temperature. This allows installers or users to set the water exactly to their comfort or regulatory requirement.

Key Features

Optimised for larger domestic and light commercial systems with 22mm pipework. Maintains sufficient flow even across multiple outlets.

Key Features

In the event of a hot or cold water failure, the valve will close to prevent unsafe water delivery. This makes them ideal for care environments or multi-user systems.

In any hot water system, delivering water at a safe, usable temperature is critical — not just for comfort, but for safety. 22mm thermostatic mixing valves automatically regulate outlet temperature, eliminating the risk of scalding and allowing plumbing systems to operate at higher, bacteria-killing storage temperatures while still delivering user-safe water.

They're especially important in healthcare and commercial settings, but are now a common feature in residential homes too. Whether you're installing under a basin, before a bath, or at a central distribution point, TMVs offer peace of mind, energy efficiency, and compliance with UK plumbing regulations.

These valves are most commonly found in domestic bathrooms, ensuite showers, care homes, hospitals, schools, and commercial washrooms — anywhere safe, temperature-controlled water is required. You’ll find them installed under sinks, near unvented cylinders, or at distribution points serving multiple outlets.

In domestic systems, they may be used to control water temperature for baths, showers, or underfloor heating loops. In commercial setups, they’re key to meeting health and safety standards while reducing the risk of liability from unsafe water temperatures.


Size	22mm
Connection Type	Compression or BSP
Valve Type	Thermostatic mixing valve
Temperature Range	Adjustable, typically 35°C – 60°C
Material	Brass body with chrome or nickel finish
WRAS Approved	Available on select models
Standards Compliance	TMV2 / TMV3 (varies by model)

It blends hot and cold water to maintain a set outlet temperature, regardless of supply fluctuations.

A TMV is a type of blending valve with built-in thermostatic control for precise and automatic adjustment.

Typically under basins, baths, near water heaters, or at central mixing points for multiple outlets.

Yes, most TMVs have an accessible temperature adjustment dial or screw.

Many models are WRAS-approved and meet TMV2 or TMV3 safety standards for public and healthcare use.

Yes — a safety shut-off is triggered to prevent hot water from reaching the user unchecked.

In certain settings like care homes, hospitals, and some new builds, TMVs are required for scald prevention compliance.

Yes — they’re ideal for controlling water temperature at individual outlets like showers and baths.

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22mm Thermostatic Mixing Valve