Legionella Management Specialists

Calorifiers & high volume water heaters

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The commonly accepted method to control Legionella in hot and cold-water systems is by temperature, ensuring:

 

A) The hot water is maintained at 60°C at the outlet from calorifiers and at above 50°C or above throughout any circulating hot water system. Localized failure in circulation can increase risk and can often be identified by slow or delayed temperature increase when turning on a tap. Non-circulating systems are targeted to reach a minimum of 50°C within one minute of turning on; and

 

B) Cold water is stored in tanks at temperatures close to the supply and ideally below 20°C. The whole distribution system) will ideally achieve less than 20°C within two minutes of turning on a tap.

 

NOTE In healthcare premises, hot water temperatures at outlets or the feed to mixer units are required to be at least 55 °C, at which there is a risk of scalding.

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Annual Task - Visually check on internal surfaces of calorifiers, cylinders and storage vessels for scale and sludge.  Arrange for samples to be taken in order to note condition of drain water. Check representative taps for temperature on a rotational basis.