Hot water tank with built in Air source heat pump and a separate feed to a stove. Does such a thing exist?

[K44]

We are trying to work out a cost effective system for our hot water, which utilises a stove (Ecco stove) with either a flu boiler attachment or a slab boiler attachment. 

We would like a tank with a built in air source heat pump, with a feed from a stove. Does this actually exist? Are we getting too complicated? 
We have been refused solar panels and are try to keep our running costs low. We have access to wood to keen to use it. 
My other half isn’t keen on the use of separate thermal stores (for reasons he understands and I don’t) 

Anyone done a similar thing? 
 

[JohnMo]

  On 04/02/2025 at 14:32, K44 said:

refused solar panels

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How have they done that, unless listed building?

 

  On 04/02/2025 at 14:32, K44 said:

flu boiler attachment or a slab boiler attachment. 

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What are they - do you have links?

[SteamyTea]

First things first.

How much DHW do you need?

If you are unsure  measure it with a jug and a thermometer.

 

You can get DHW cylinders with built in heat pumps, you can also get ventilation units with A2WHPs built in.

 

But first you need to work out your water demand.

[K44]

  On 04/02/2025 at 15:33, JohnMo said:

How have they done that, unless listed building?

What are they - do you have links?

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Planners have refused solar panels on roof to preserve the look of the 200 yr old stone barn (Lake District national park and world heritage site). Would need separate planning app, biodiversity net gain report and mitigation before we could put in the field behind. Shelving that for now.

 

slab boiler is basically a copper tank that sits in additional masonry section on top of stove body with plumbing connections (no pics I’m afraid). Flue boiler is this https://www.charnwood.com/files/documents/instructions/fb100~200~300.pdf

[K44]

  On 04/02/2025 at 17:08, SteamyTea said:

First things first.

How much DHW do you need?

If you are unsure  measure it with a jug and a thermometer.

 

You can get DHW cylinders with built in heat pumps, you can also get ventilation units with A2WHPs built in.

 

But first you need to work out your water demand.

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For washing up, showers etc I’m guessing 150 to 200 litres a day for house of 3. Have seen plenty of hot water cylinders with built in heat pump of that size with immersion heater and maybe a coil for solar thermal but none that have supplementary coil to take feed from wood stove back boiler. Could solar thermal coil take the wood stove feed? Much higher temps I guess….

[SteamyTea]

  On 04/02/2025 at 23:41, K44 said:

Could solar thermal coil take the wood stove feed

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Maybe a plate heat exchanger.

But why bother. Wood burning is tedious and dirty.