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What a difference a few degrees make.

 
Domestic Hot Water & Cylinders
Last Post by Old_Scientist 2 months ago
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Toodles
 Toodles
(@toodles)
Famed Member Contributor
Joined: 4 years ago
Posts: 2956
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 2 months ago by Toodles

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


   
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 Old_Scientist
(@old_scientist)
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Joined: 2 years ago
Posts: 557
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 large radiators. 7.2kWp solar (south facing), Tesla PW3 (13.5kW). Net Zero


   
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