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D_Hailsham, Yes - just that. It's a bit Heath Robinson, I know. Perhaps you will be able to experiment a bit and refine the method. Given sufficient time, perhaps an hour or so depending upon the hot tap flow rate you set, the system should settle down to equilibrium through the boiler...

PS: I was assuming a combi boiler, not a conventional one with a hot water tank. But the method should still work - you will just require a bit longer to bring the system to thermal equilibrium, especially if the hw tank is fed from a cold water storage tank.

Thanks for asking, D_Hailsham. I do it as follows: you will need a reliable thermometer, precise to 0.1 degree C, and a reasonably sized water container of known capacity - say 10L Turn off all radiators, taps, and appliances. Choose a hot tap for the measurement - the bath is a good...

I have had a Worcester Heatslave 2+ boiler for 27 years. During that time it has been serviced annually by a gas engineer. The other day it required its first spare part - the pilot safety thermocouple failed. Other than this minor repair it has never gone wrong or caused any trouble. I...