Servicing Of Thermostatic Mixing Valves

A Thermostatic Mixing Valve (TMV) is a device which mixes hot and cold water before discharging it at a stable temperature. The correct installation and maintenance of a TMV is critical to its correct operation. Without regular servicing these devices may fail to do their job and serious scalding can result. This is particularly important in hospitals, schools and care homes where users are at their most vulnerable.

For example, NHS institutions have a duty of care that requires hot water temperature to be controlled. Maximum temperatures are 41°C for handwashing and showers, 44°C for baths and up to 46°C only for supervised baths. Injury from scalding is on the Department of Health’s ‘never events’ list and action must to taken so it can be prevented in public hospitals. The requirements of D08, an NHS Model Engineering Specification for TMVs, are covered by the TMV3 scheme. These signify strong approval for the effectiveness of TMVs.

Care homes also have a duty of care requirement that encourages them to use TMVs, both to limit the risk of scalding and to ensure that water is at a comfortable temperature that does not discourage hand washing. Where there are vulnerable residents bathing, TMVA recommends the use of TMV3 valves.

Assured Air and Water provides professional installation and servicing of TMV3 thermostatic mixer valves. All valve services include a complete service record and report. Where required, the descaling and disinfecting of taps, shower heads and shower hoses is also available.

Our staff have undergone training from the leading manufacturers to ensure that their product receives the standard of service and maintenance required to allow the TMV to operate at the highest possible level.

Example of a Thermostatic Mixing Valve

TMV Function Diagram