TMV servicing refers to the regular maintenance and servicing of thermostatic mixing valves (TMVs), which are devices that are installed in buildings to control the temperature of hot water supplied to taps, showers, and other outlets. TMVs are designed to ensure that the hot water supplied is at a safe and consistent temperature, to prevent scalding and the growth of harmful bacteria.

In accordance with the British Standards BS EN 1111:2018 and BS EN 1287:2019, TMV servicing should be carried out at least annually by a qualified and competent engineer. The service should include:

– A visual inspection of the valve and its components, to check for any signs of damage or wear

– A functional test of the valve, to ensure that it is operating correctly and providing the correct temperature of water

– A flush of the valve to remove any debris or build-up

– A check of the valve’s adjustment, to ensure that it is set correctly for the specific installation

– A check of the valve’s documentation and calibration certificate

– A report of the service carried out and any recommendations for further action.

In addition, the Health Technical Memorandum 04-01 (HTM04-01) D08 document, which sets out guidelines for the design, installation, commissioning, and maintenance of hot water systems in healthcare premises, also recommends that TMVs be serviced annually and fail safe tested 6 monthly to ensure that they are working correctly and safely.

Properly servicing TMVs is important because it helps to ensure that the valves are providing safe and consistent temperatures of hot water, and also helps to prolong the life of the valves and prevent unnecessary breakdowns.

By having their TMVs serviced regularly by a qualified and competent engineer, building managers and facility managers can help to ensure that their hot water systems are safe and compliant with legal requirements, while also protecting the health of employees, visitors, and residents.