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Heat Pump Manufacturers Recommending Buffer Tanks

 
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Thermostats, Volumisers, Buffer Tanks, TRVs, Pumps, Piping, Valves, Radiators & Controls
Last Post by Johnmo 9 minutes ago
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Mars
 Mars
(@editor)
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Joined: 4 years ago
Posts: 3195
10/05/2025 7:37 am  

@damon thanks for the quick reply, and that’s quite the glowing reference for Viessmann. Thanks for explaining.

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 GrahamF
(@grahamf)
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Topic starter 10/05/2025 8:26 am  

@editor thanks Mars.  This is for our home.  I have already had a visit from an installer that you recommended and we got on well.  I am expecting a quote from him. 

One of my potential installers is proposing a combined solution of complete roof replacement, loft insulation, in-roof solar, battery and heat pump.  I am not confident in their approach to heat pumps.  They have refused to work with another heat pump installer and are saying it is an all or nothing deal.  I am talking to an alternative roof and solar provider.


   
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Mars
 Mars
(@editor)
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Joined: 4 years ago
Posts: 3195
10/05/2025 8:40 am  

Posted by: @grahamf
↑

They have refused to work with another heat pump installer and are saying it is an all or nothing deal.

Definite alarm bells there!

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SUNandAIR
 SUNandAIR
(@sunandair)
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Joined: 2 years ago
Posts: 493
10/05/2025 9:56 am  

Posted by: @damon
↑

it uses an Esbe 4 way valve in a three way configuration, hot water, buffer, heating.

when it senses it requires a defrost it loads the buffer to around 55/60°c and uses this to defrost. So on a direct system it doesn’t impact the house load or temp.

Nice idea. Clever system, sensing the frost quite early in order to raise the temperature quick enough. As you say it’s a high temp solution. But sounds like it maintain emitter temps.

Daft idea:

I was kite-flying an idea following a recent discussion about having a volume buffer with a clever valve which diverted all the defrost water into a buffer store and trickle-fed the chilled volume over the (assumed) 40 minutes between defrosts. It would need a self contained temperature sensing valve but I don’t know if such a valve exists.

This would ensure an even distribution of the 50 ltrs or so of chilled water over the maximum period between defrosts, allowing the HP to raise its flow temp in its normal operation.

Imagined benefit. A self actuating valve might be able to be fitted to any HP with no wired in controls; No forced FT boost; thorough mixing over a longer period with reduced upset to the heat transfer.

if such a valve existed 🤔. Would it even work?

 

This post was modified 18 minutes ago by SUNandAIR

   
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 Johnmo
(@johnmo)
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Joined: 2 years ago
Posts: 470
10/05/2025 10:12 am  

A lot of things can work if you are SCoP chaser, do they they add value, are they really cost effective to do? Small buffer £50 to 100, some valves and pipe £100, so soon got to £200, would they really save that over 10 years, doubt it.

I did look at a home brew version, but complexity, cost and benefits - just not worth it.

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