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what temperature do you set the thermostat to on the hot water tank ? I have it set to 60'c which seems to be about right. My housemate reckons ours always used to be set to 45'C - I find this hard to believe but never used to check it until I noticed a decrease in the amount of hot water, and the landlord reckons it should be at 65'c which I reckon is a bit much...
what's the norm ?
Kev
70 on mine, my plumber reckoned 60c should be fine though...
IIRC you need it at or above 60deg to gaurantee it stays bug free.
The temperature should be above 65deg for at least 2 hours (I think) per week. Any lower and there is a risk of Legionella in the water tank.
For heat pump systems I've fitted, a 7 day programmable timer on the IH boost the temp once a week to achieve this. The thermostat is set to 50deg for everday usage for the hot water provided by a heat pump.
55 for bug protection, however 60 is about correct to err on side of safety.