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Replacing Storage Heaters with a Heat Pump in a Stone Cottage

Paul1098 · 2026-09-27T20:22:39Z

Hi Mars,Just at the start of my Renewable journey and watched a couple of your Youtube videos on Heat pumps and Installers.I'm not surprised that people struggle to find a decent installer for heat pumps as we have struggled to get a decent installer for a new oil boiler in the recent past and some have even struggled to service it.Looking to use the BUS to replace old storage heaters with a heat pump in an stone cottage - another complication being it's in a national park with Article 4 restrictions but hopefully rear back yard is OK.I'm OK with heat loss calcs and pipe sizing for normal high temp heating systems but can imagine the low temps involved with heat pumps cause a few extra problems.

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Air Source Heat Pumps (ASHPs)

Last Post by Paul1098 10 minutes ago

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Paul1098

(@paul1098)

New Member Member

Joined: 2 days ago

Posts: 6

Topic starter 29/09/2026 9:22 pm

@jamespa E7 energy usage seems to vary a lot from year to year probably based on how cold it is and how often we are there.
1638kWh 2024, 5399kWh 2025 & 3343kWh 2026. All taken from energy bill on roughly same date each year and covers storage heaters and immersion heater.

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JamesPa

(@jamespa)

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Joined: 3 years ago

Posts: 5467

29/09/2026 9:30 pm

That's tiny. If it's correct figure for annual use and if you actually heat the house with the storage heaters and assuming you are in the UK it suggests a loss at design outdoor temperature of 2kW max. Can this be true? If not which assumptions are incorrect? Is it that you are hardly ever there so don't heat the house?What's the floor area btw? If it is rarely occupied and only for short periods then an a2w ashp may not be a great choice, you may be better with a2a particularly if you have no plumbing for distribution.

This post was modified 12 minutes ago by JamesPa

This post was modified 11 minutes ago by JamesPa

4kW peak of solar PV since 2011; EV and a 1930s house which has been partially renovated to improve its efficiency. 7kW Vaillant heat pump.

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Paul1098

(@paul1098)

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Joined: 2 days ago

Posts: 6

Topic starter 29/09/2026 9:36 pm

@cathoderay I too remember the Airfix models of my youth but don't think I ever had the patience to do a Lancaster bomber.
I also remember the complex physical plastic scaled models of chemical plants that we used to use before 3D CAD pipe modelling became a thing. We used them to check whether our guesstimated pipe routes would fit prior to producing fabrication Iso's for the new plant.
I've come across many a 'professional' in my working career that thought things were correct because computer model said yes and often they were wrong because of incorrect input.

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