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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 JamesPa 30 minutes ago

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Paul1098

(@paul1098)

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Posts: 12

Topic starter 30/09/2026 11:05 am

@jamespa I assume getting the WC curve and rad balancing right is what gives you a decent heat pump system. I assume once you've set this up it doesn't need changing for the summer or does it?

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JamesPa

(@jamespa)

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30/09/2026 11:16 am

Posted by: @paul1098

↑

@jamespa I assume getting the WC curve and rad balancing right is what gives you a decent heat pump system. I assume once you've set this up it doesn't need changing for the summer or does it?

Yes. Basically the best way to run a heat pump system, in many, probably most, cases, in open loop 24x7, no controls other than weather compensation. TRVs and thermostats, if present, set a couple of degrees above the desired temperature to act as limiters not controllers. Best not to fit a thermostat as the heat pump native controller will invariably have a temperature sensor of its own and third party thermostats (particularly 'smart' ones) can mess badly with heat pumps unless specifically designed for the purpose (homeley, adia, passiv and Havenwise only at present)

In summer you can either manually switch off space heating or there may be a parameter like 'max temperature for heating that you can set so it switches itself off automatically. The first is simpler! A half decent heat pump will allow you to do all of this remotely.

This post was modified 28 minutes ago 2 times 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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