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Systems serving showers and hand basins should deliver water at less than 43 degree celcius, to prevent scalding. The main boilers should be maintained at temperatures not below 60 degre celcius, to prevent colonisation by Legionella bacteria. The temperature reduction required can be achieved by mixing valves.

Tepid water systems (or modified tepid water systems that keep temperatures below 60 dgree celcius) must be maintained in accordance with the Health (Legionella) Regulations 2001. Instantaneous hot water systems can be controlled to provide water at these ranges, without the need for storage or mixing valves.