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300 Liter Tank - Do I have to heat it all?

 
Domestic Hot Water & Cylinders
Last Post by Morgan 1 hour ago
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 martingale
(@martingale)
New Member Member
Joined: 12 hours ago
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Topic starter 30/07/2025 9:14 pm  

Hello,

I'm moving into a house soon that has a 300l DHW unvented tank with an ASHP. It's just the two of us (most the time) so this tank is unfortunately a good 100l too big.

Is there any strategy I can use to only heat say half the tank to the specified temperature? Or is it all or nothing and if this is longer term, maybe I should swap it for a smaller tank?

 

Thanks for any advice!

 

 

This topic was modified 12 hours ago by martingale

   
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Morgan
 Morgan
(@morgan)
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Joined: 4 years ago
Posts: 619
31/07/2025 7:37 am  

You will only heat the full 300L from Stone Cold. Thereafter, you will be topping up and heating what you use. If the DHW tank is well insulated, I would personally leave it as is.  This, however, is a personal opinion, and I'm no expert.  I do suspect that the cost of swapping the tank will be hard to recover unless there is a value/market in your second-hand tank.

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