ᐅ Heat pump produces more heat at colder temperatures

Created on: 19 Nov 2022 20:54
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Manani87
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Manani87
19 Nov 2022 20:54
Man repairing a wall-mounted air conditioner with a screwdriver on a white brick wall.


Hello, I have noticed that our air-to-water heat pump is heating the rooms (underfloor heating) more as the outside temperature gets colder. This happens even though no changes were made to the thermostat or the heating system. Shouldn't the temperature remain constant?
kati133719 Nov 2022 21:18
Is the system controlled by outdoor temperature? Maybe there is something wrong with the curve, adjustments can be made there. However, a professional handled this for us, so I wouldn’t try to make changes myself.
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Matthias45
21 Nov 2022 14:21
That is completely normal. Since more heating capacity is required, the heat pump increases the temperature (heating curve).
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Benutzer 1001
21 Nov 2022 15:11
The steepness of the curve probably isn’t right, but if it’s colder outside than inside, that’s normal to some extent.
Still, please check how many cycles your heat pump has.
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netuser
21 Nov 2022 15:24
kati1337 schrieb:

But a professional did it for us; I wouldn’t mess with it myself.

Isn’t that a misconception and exactly the reason why 95% of households have incorrect settings or heat inefficiently? 😉
Musketier21 Nov 2022 15:44
The heating systems are controlled based on the outdoor temperature. The colder it gets outside, the higher the temperatures within the heating system. This is normal.

However, if you mean the room temperature, then either the radiator temperature was previously set too low and the room thermostat was set so high that the valves never fully closed, or it’s due to inertia, meaning the screed simply heats up too much before the thermostat shuts off. The temperature fluctuation around the desired setpoint is then quite large, which might make the room feel too warm. Have you set different temperatures for day and night operation?

A few years ago, I experienced the same phenomenon during colder temperatures after I deactivated the room thermostat early in the heating season and adjusted the circulation cycles. The rooms became too warm during the colder winter months. This is related to the steepness of the heating curve. I then reduced the steepness accordingly. However, this had the effect that during the transition period in spring, the temperature—especially in the bathroom—no longer matched well. I was able to somewhat compensate for this by adjusting the parallel shift.