News - May 31st 2007

Hot fuss?

Whats all the fuss about TMV’s?

TMV2 and TMV3 Valves are an essential safety feature to ensure water cannot reach taps at an unsafe temperature. By incorporating a Thermostatic Blending Valve you can prevent accidental scalding and injury.

These products are highly recommended if you have small children or if the bathroom is to be used by the less-able or elderly.

TMV3 Blending valves are easily incorporated under a sink or bath (or in a convenient location), and work by sensing the temperature of incoming hot water, then thermostatically blending a constantly variable amount of cold water to the hot water feed - thus achieving a selectable maximum temperature setting. Once installed and set, the valve operates automatically, monitoring temperature as soon as a tap is opened.

What is the TMV scheme all about?

The TMV Scheme is an independent third party approval scheme. The TMV Scheme certifies Type 3 thermostatic mixing valves manufactured to meet the highest specifications required by the NHS Estates D08 standard for mixing valves for use within health care premises in the United Kingdom.

The TMV Scheme also certifies Type 2 thermostatic mixing valves for the domestic market and is working to promote the safe use of hot water in domestic premises.

How did it originate?

In 1994 a meeting was held to which manufacturer’s of thermostatic mixing valves (TMV) were invited to discuss the testing of the above valves in order that they could be certified safe for use in healthcare premises.

At a subsequent meeting in 1995 a set of supply conditions were established. Following this a document was produced to ensure that Thermostatic Mixing Valves for safe operation in Health Care Premises could be identified and certified.

The document included “type” testing for Third Party Certification, details of commissioning requirements and in-service testing.

After an initial draft document called “National Health Service Model Engineering Specification for “Thermostatic Mixing Valves (Health Care Premises)” was presented in 1996, a defintive guideline document was incorporated in the 1998 Health Guidance Notes revision of Safe Hot Water and Surface Temperatures.

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