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Originally Posted by Itshim
Ok perhaps I am just stupid not thinking of this. The guy just serviced my boiler asked if I ever added cold water when I run hot. If so my boiler is set too high , don't know it had a control on it !  |
Most modern boilers are preset to 60c - 65c, and you have no way to override it.
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Legionella bacteria is commonly found in water and it multiplies at temperatures between 20 to 45 degrees Celsius.
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The temperature for the rads is best at 75c according to most manufacturers, as you get most efficient use of the gas. Any lower, and the pump will run more often and longer and use more electricity.