Thermostatic Mixing Valves
General
The Kiwa Drinking Water Installations laboratory in Rijswijk is an accredited laboratory for testing Thermostatic mixing valves. The results can also be used for TMV2 & TMV3 certification by Buildcert Ltd
Thermostatically controlled valves are widely available to control the temperature of water for showering, bathing and hand-washing and provide the solution to scalding, by blending hot water with cold to ensure constant, safe outlet temperatures. These valves should be particularly considered in areas where people would be at the highest risk of scalding.
These valves can described as
Type 1
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a mechanical mixing valves
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Type 2 (TMV2)
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a thermostatic mixing valve conforming to EN 1111 and EN1287
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Type 3 (TMV3)
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a thermostatic mixing valve complying with NHS Estates requirements DO8.
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A Thermostatic Mixing Valve (TMV) approved as a TMV3 valve ensures that the valves are 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. Although TMV3 thermostatic mixing valves are predominatly used in the healthcare industry they can be used in all types of buildings.
Normal Conditions are
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TMV2
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TMV3
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EN 1111
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EN 1287
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HP- D08
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LP-DO8
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Maximum Static Pressure
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10Bar
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10Bar
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10Bar
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10Bar
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Flow Pressure, Hot & Cold
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0.5 to 5Bar
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0.1 to 1Bar
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1 to 5Bar
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0.2 to 1Bar
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Hot Temperature - °C
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55 to 65
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55 to 65
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52 to 65
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52 to 65
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Cold Temperature - °C
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≤ 25o
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≤ 25 o
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5 to 20
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5 to 20
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Kiwa are accepted by Buildcert for the following designations for TMV3 testing in accordance with DO8
-HP-B
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High Pressure
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Bidet
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-HP-S
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High Pressure
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Shower
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-HP-W
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High Pressure
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Washbasin
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-HP-T44
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High Pressure
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Bath with fill temperature up to 44°C
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-HP-T46
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High Pressure
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Bath with fill temperature up to 46°C
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-HP-D44
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High Pressure
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Bath with fill up to 44°C & Shower up to 41°C
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-HP-D46
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High Pressure
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Bath with fill up to 46°C & Shower up to 41°C
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-LP-B
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Low Pressure
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Bidet
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-LP-S
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Low Pressure
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Shower
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-LP-W
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Low Pressure
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Washbasin
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-LP-D44
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Low Pressure
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Bath with fill up to 44°C & Shower up to 41°C
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-LP-D46
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Low Pressure
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Bath with fill up to 46°C & Shower up to 41°C
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