>> Actually I measured the temperature of it recently - 55 degrees. It seems my boiler
>> does 55 degree hot water with no controls to change it even if I wanted
>> to. The manual seems to say the temperature gauge on the boiler only changes the
>> central heating temperature.
Presumably you have a copper cylinder heated indirectly from the boiler as in Z's explanation to Bobby. We have that system too but there's a thermostat attached to the cylinder which will close the valve to the coil or, in HW only mode, shut off boiler and pump when the target temperature is reached.
IIRC my daughter had a system like yours at her previous house - cylinder in airing cupboard but no thermostat.
I did some training on energy advice shortly after joining CA as an employee and have a City and Guilds qualification. Never used it; he then manager needed accredited advisers to match numbers required for a funding bid. I'm sure we were told then that 50/55 was recommended for hot water systems as the Legionaries bug could thrive up to that level.
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