On 25 Mar, 17:13, John Rumm wrote:
None wrote:
Would the boiler have a temperature reading? Im at work, so cant
check... also, should hot water be always maintained at or above 65
deg? Is that even doable?

The boiler may well have a temperature control for its primary water
circuit. The cylinder will normally also have a thermostat that controls
when heating for the cylinder is demanded. There is often a programmer
involved somewhere as well that would also need to call for heat for the
boiler to fire and reheat the cylinder.

You want the cylinder to get to at least 65 at some point each day to
ensure that any bacteria in it are killed.

--
Cheers,

John.

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Just checked the hot water again, still seem to be getting some
greenish feathery bacteria in there, I wonder if I should use some
bleach in the system to have more drastic effect...