SWMBO used to insist we needed 90 minutes boiler on in the morning and another 60 minutes late afternoon to satisfy hot water requirements.
I installed a solar diverter in the early summer to heat the immersion with free power and at times we have not had it on for days as a result, and even as it's getting cooler and less sunny 30 minutes of the boiler in the morning seems to provide enough most days. The solar thing adds very little now.
Gas usage July & Aug
2019 645
2020 670
2021 102
But I realise that's only £35 or so.
I can see that when the boiler is only on for an hour in the morning now it uses about 6kWh a day whereas before it was more like 13 over the 2.5 hours it was on. That is fairly comparable even with the solar device.
Also I've mentioned before the massive saving by changing the old 1986 freezer for a new one. The new one uses about a third of what the old one did, at 0.68 kWh per day compared to 2.2.
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