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Unvented Hot Water cyclinder 300l 50c vs 60c

 
Domestic Hot Water & Cylinders
Last Post by jeegnesh 7 months ago
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 jeegnesh
(@jeegnesh)
Estimable Member Member
Joined: 11 months ago
Posts: 60
Topic starter 03/03/2025 5:15 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)
Honorable Member Member
Joined: 1 year ago
Posts: 252
03/03/2025 7:39 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 7 months ago 2 times by Old_Scientist

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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 jeegnesh
(@jeegnesh)
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Joined: 11 months ago
Posts: 60
Topic starter 03/03/2025 7:54 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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