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Setback savings - fact or fiction?

cathodeRay · 2025-02-27T11:24:11Z

This is a renewed attempt to solve the setback riddle - do setbacks save money without compromising comfort? So far this apparently simple question has eluded a confident answer, largely because the empirical results and theoretical predictions do not agree. This means either one of them, or possibly both, are wrong. The initial posts here have been moved from another thread as they no longer related to that thread's title.

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Air Source Heat Pumps (ASHPs)

Last Post by PeterWurmsdobler 2 hours ago

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PeterWurmsdobler

(@peterwurmsdobler)

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Joined: 4 days ago

Posts: 6

18/05/2026 9:17 am

Posted by: @jamespa

↑

That said, operating a heat pump on pure (well adjusted) weather compensation with reasonably well balanced radiators without TRVs works very well for many, including me! The problem with this approach is that it takes some tweaking, which cant readily be done in the time between when installers finish the plumbing and when many want to go home.

Indeed, I can well imagine that a heat-pump based system for our 1930ies semi with about 90m^2 should work well with some simple control, including weather compensation; most internal doors stay always open due to the cats wanting to walk around freely in the house without scratching doors. To arrive at this state, it would need some preparation in advance to get most bits right, like radiator sizes and power rating, then monitor and tweak after installation. This is were external software solutions can help, Havenwise or others such as Adia which comes with its own hardware.

Ideally I would like Adia's control software and controlled radiator valves (but not their unit) in tandem with a Viessmann VitoCal 151-A (or equivalent self-contained pre-plumbed 600mm x 600m unit). This would allow controlling temperature profiles for different rooms separately, because "well-balanced" radiators and a single control loop means there is only one common profile moving in unison, even if some rooms might be cooler than others; but their temperatures are correlated. Alternatively, I might get started with Home Assistant and compatible devices for sensors and actuators.

Regards, peter

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