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Water cylinder for heat pump outside the house

alex6547 · 2023-02-10T13:20:31Z

Has anyone tried or seen the hot water cylinder for a heat pump outside the house in an insulated shed or something similar? I live in a small house and sacrificing one of the wardrobes to have a cylinder in place has been bothering me for a while. I thought about putting the cylinder outside, building an insulated structure around it. At first, I don’t see any issues with that, it possibly allows me to have the cylinder and the heat pump a bit further away from the house as well as I'm learning about underground insulated pipes and the costs associated.What are your thoughts on that? I can see on the technical specs of Vaillant Aeroterm plus as 20 metres as the maximum distance, I guess that is between the monobloc and the water cylinder? I guess I can get them close to each other, but distant from my house.I've no idea how much loss of efficiency I'll have by using underground insulated pipes, but from initial research it seems that it may be negligible as underground the temperature is always 13c all year, including when it is -5c outside, and the pipe insulation looks to be pretty good.

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Domestic Hot Water & Cylinders

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Old_Scientist

(@old_scientist)

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Joined: 2 years ago

Posts: 390

06/04/2026 2:47 pm

My neighbour has his water cylinder (plant room) in a timber built lean-to shed on the side of the house, due to inside space limitations. The shed was extremely well double-insulated with overlapping Kingspan insulation sheets, and pipework passes immediately through the exterior wall into the property minimising outside pipework and all contained within the insulated shed. All pipework was well insulated.

Obviously this is not an ideal solution as there will still be heat loss from the cylinder to the outside, but it is a trade off versus space and not all properties have space for a cylinder. Because it is a small well insulated space, there is probably less heat loss than if cited in a loft space which seems to be quite common.

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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