DHW setpoint and differential setting (most energy efficient

[jk-london]

Looking to find advice for the most efficient settings for Hot Water Cylinder.

I've got the HW Setpoint at 55C and the differential at 10C currently.
Boiler is set to 65C on the flow.
I heat HW between 6am and 8pm, this normally means that HW is heated once per day.

The boiler "burns" for an hour in order to bring the cylinder from 45C up to 55C (FYI it will overshoot 55C to usually bring the cylinder to 58C). The cylinder looses about 1C every 2 hours when HW is not being used.

Is 1 hour a long time to heat the cylinder? (210L cylinder)

Any suggestions on changing these settings? I was thinking of making the differential 3C or 5C, which would help when someone wants to run a bath and the water is at the lower end of Temp, but not hit the differential, but as this happens infrequently and may result in longer burn times for the boiler over 24 hours - I'm not sure it would be worth it.

Looking for boiler flow Temp, setpoint temp, differential and schedule settings or other suggestions.

Are there reccomended settings for the winter vs the summer?

Additionally, is there a way to "boost" the HW Cylinder heating - for instance, if someone were to want a bath, they could override the differential and have the system bring the temp to the setpoint regardless of the differential?

Many thanks,

JK

[Richard]

Sounds like you've put some thought into this.

If the cylinder pipes aren't lagged, maybe invest in this?

I can only advise you store DHW at 60C, as this is what HSE recommends.