Reply To: Hot Water and Leaky Pipework

Kevin Murray

    In the UK, AFAIK, the regulations say that the temperature of domestic hot water should be above 60 Celcius, to kill Legionnaires’ Disease bacteria,and below 70 degrees for H&S, so it is wise to ensure that your thermostatic mixture is set to produce temperatures in this range.
    A point to consider is, what was the temperature of the water before it was modified by this arrangement? An indirectly-cooled diesel engine will produce a coolant temperature of between 80 and 110deg Celcius, and consequently that is the temperature range of the water contained within the calorifier. If it is running hotter than this, then inspect your heat exchanger and exhaust bend, as your cooling system may not be working at full efficiency.