Run ours at 17; it's ok mostly. Occasionally boost to 18 if it's really chilly.
Also discovered that with the Nest we have, you have to set the hot water to come in 30 minute intervals, no less than that. I always found our water was hot at any time, and it was set to run the boiler for 30 mins in the morning and 30 in the evening.
Few days ago I cancelled the evening run, so it's for 30 minutes only in the morning. Water still is hot at any time we want, and Mrs C hasn't complained, so that's 30 mins of boiler demand a day removed.
Nest history tells me how often the boiler is on - for years in winter it's 4-6 hours a day. Since dropping to 17 a few weeks ago and altering the hot water schedule it's been about 2 hours or less.
Last edited by: Crankcase on Tue 15 Mar 22 at 12:04
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