Why Heat Pump Controls Are Different
A gas boiler is happy blasting out heat, switching off, then blasting again. A heat pump is the opposite: it is most efficient running gently and continuously at a low flow temperature. That means the controls matter far more than they ever did with a boiler — and using boiler-era habits (turning it off when you go out, cranking it up when you come home) actively wastes money on a heat pump.
The single biggest control feature that saves you money is weather compensation. Get it set up correctly and your running costs drop without you touching anything.
What Weather Compensation Actually Does
Weather compensation links your heat pump to an outdoor sensor and continuously adjusts the flow temperature to match how cold it is outside.
- Mild day (12°C): the system might run at 30°C flow — very efficient.
- Cold day (−2°C): it lifts to perhaps 45°C to keep you warm.
Because efficiency (SCOP) rises sharply as flow temperature falls, running at the lowest temperature that keeps the house comfortable is exactly what you want. Weather compensation does that automatically, minute by minute, far better than a person adjusting a dial ever could.
Smart Thermostats vs Heat Pump Controls
There is an important distinction. A generic smart thermostat (the kind marketed for boilers) can actually harm heat pump efficiency if it simply switches the unit on and off. What you want are controls designed for heat pumps — room sensing, scheduling and setback that work with weather compensation rather than overriding it.
Most quality heat pumps now come with a manufacturer app that shows real-time performance, energy use and SCOP. That visibility is genuinely useful: you can see the effect of a tariff change or a schedule tweak in the data.
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How to Run It for the Lowest Bills
- Leave it on. A steady low-level output is cheaper than big on/off swings.
- Small setbacks, not big ones. Dropping 1–2°C overnight is fine; switching off entirely forces an expensive high-temperature catch-up in the morning.
- Let weather compensation do its job. Resist the urge to keep nudging the temperature.
- Pair it with a heat-pump tariff. Smart controls can pre-heat during cheap off-peak windows, storing warmth in the fabric of the home and your hot-water cylinder.
Done together, these turn a heat pump from “about the same as gas” into clearly cheaper.
What Good Controls Are Actually Worth
It is easy to treat controls as an afterthought, but on a heat pump they have a direct, measurable effect on your bill. Weather compensation alone typically improves seasonal efficiency by pushing the average flow temperature down.
A worked example: a home running a fixed 50°C flow temperature all winter might see a SCOP of around 3.0. The same home with weather compensation, averaging perhaps 38°C flow across the season, can reach a SCOP of 3.6 or better. On a 12,000 kWh heat demand that is the difference between roughly 4,000 kWh and 3,333 kWh of electricity a year — around £110–£160 saved annually just from the controls doing their job, with no loss of comfort.
Add smart scheduling on a heat-pump tariff and you save again by pre-heating the fabric of the home and the hot-water cylinder during cheap off-peak windows, then coasting through the expensive peak. The controls pay for themselves many times over across the life of the system — which is why we commission them properly and show you exactly how to run yours, rather than leaving them on a factory default.
Frequently asked questions
You need controls designed for heat pumps rather than a generic boiler smart thermostat. The key feature is weather compensation, which continuously matches flow temperature to the outdoor temperature. We set this up as standard on every install and show you how to get the best from it.
No. Unlike a boiler, a heat pump is most efficient running gently and continuously. Turning it off and back on forces an expensive high-temperature catch-up. A small setback of 1–2°C is fine; switching off is not.
Yes, when they are heat-pump-appropriate. Weather compensation keeps flow temperatures — and therefore running costs — as low as possible, and smart scheduling lets you pre-heat during cheap off-peak tariff windows. Together these can cut running costs by a meaningful margin.
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