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Unvented Hot Water cyclinder 300l 50c vs 60c

 
Domestic Hot Water & Cylinders
Last Post by jeegnesh 2 weeks ago
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 jeegnesh
(@jeegnesh)
Estimable Member Member
373 kWhs
Joined: 5 months ago
Posts: 53
Topic starter 03/03/2025 4:15 pm  

I have an 300l unvented cyclinder which I'm currently heating to 52c during cheap rate and then topping up at midday.

Probably 5 showers plus taps and kitchen sink usage.

My query is if I was to heat to 60c would that allow me to not have to top up in the day?

13.6kw Solar, 27kw Battery, 10kw Heat Pump and EV Car


   
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 Old_Scientist
(@old_scientist)
Reputable Member Member
889 kWhs
Joined: 9 months ago
Posts: 129
03/03/2025 6:39 pm  

It might do, try it and see?

As the majority of your usage is showering, where the hot water will be blended down to ~38C, heating it hotter should make it go further as less hot and more cold will be used for each shower.

On a practical note - can your heat pump actually heat the hot water to 60C? Mine can't, the flow temp cuts out at 60C max which achieves a DHW tank temp of ~54C. After this, the immersion kicks in, so hot hot you can heat will depend on the max flow temp your ASHP can achieve.

 

This post was modified 2 weeks ago 2 times by Old_Scientist

   
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 jeegnesh
(@jeegnesh)
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373 kWhs
Joined: 5 months ago
Posts: 53
Topic starter 03/03/2025 6:54 pm  

I will experiment, yes my ashp is capable of heating to 60c I'm sure I had it that way at the start.

13.6kw Solar, 27kw Battery, 10kw Heat Pump and EV Car


   
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