FWIW, I too used to run the hot water for a long time each day. Then I tried reducing the hours to see how far I could go before there was insufficient hot water.
I'm now down to 30 minutes in the morning, the least the Nest can do. The water is still hot as anything 23 hours later.
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.
I'd like to think that's wrong somehow, because 55 is too hot in the taps really. I already altered the thermostat on the immersion cylinder itself (which can be electrically turned on at the wall if you needed to, but very firmly isn't), but that made no difference at all.
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