|Temperatures||What happens to the Legionellae at this temperature|
|below 20°C||The organism can become dormant at much lower temperatures and return to active multiplication whenever more favourable conditions occur.|
|between 20°C and 37°C||Multiplication increases as the temperature rises above 20°C and reaches the peak at 37°C.|
|between 37°C and 46°C||Multiplication slows down after 37°C and ceases around 46°C.|
|approx. 50°C||The environment becomes slightly hostile to the bacteria, some of which will be killed in a few hours.|
|approx. 60°C||The environment becomes very hostile to the bacteria, most of which will be killed in a few minutes.|
|approx. 70°C||The bacteria are killed virtually instantaneously.|
Cold Water Outlets
These must be below 20°C within 2 minutes of running the outlet. Frequency of Testing Details
Hot Water Outlets (excluding showers and any outlet controlled by TMV)
These must be above 50°C within 1 minute of running the outlet.
The water must be stored at 60°C and any return back to the calorifier should be at least 50°C
Need a suitable Thermometer?