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What a difference a few degrees make.

Domestic Hot Water & Cylinders

Last Post by Old_Scientist 3 weeks ago

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Toodles

(@toodles)

Famed Member Contributor

Joined: 4 years ago

Posts: 2903

Topic starter 14/07/2026 9:54 am [#3099]

With this prolonged spell of warm weather, the ground through which the mains water flows has warmed up considerably. I have noticed that the ‘cold water’ is now tepid and decided to check the temperature; our main is flowing in at ~26.5 degrees C. this morning. This may go some way to explain how our daily DHW energy requirement has dropped to ~ 2.3 kWh when normally in the summer, it would be ~3 - 3.5 kWh per day. (This is using the Sunamp Thermino Epv 210 and servicing the needs of two persons.) Regards, Toodles.

This topic was modified 3 weeks ago by Toodles

Toodles, heats his home with cold draughts and cooks food with magnets.

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Old_Scientist

(@old_scientist)

Honorable Member Member

Joined: 2 years ago

Posts: 503

14/07/2026 4:18 pm

Wow. Having accepted the challenge, I ran the cold tap for a good few minutes to pull through fresh water, and the temperature stabilised at 21.0C.

I don't recall what temperature I measured in winter, but think it may have been somewhere around 10-12C maybe.

At 26.5C, I wouldn't even bother heating the water - that sounds about the perfect temperature for a shower at the moment!

Samsung 12kW gen6 ASHP with 50L volumiser and all new large radiators. 7.2kWp solar (south facing), Tesla PW3 (13.5kW)
Solar generation completely offsets ASHP usage annually. We no longer burn ~1600L of kerosene annually.

👍

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