In general, it is usually said that it is profitable to repair even if the heat pump is at least 16 years old. After that, you usually replace it if you suffer an expensive repair.
Replacing the compressor is normally done after about half the service life, i.e. about 8-12 years, so it can be good to have a little extra control over the compressor.
The most common way that you usually discover that something has broken is that you get rid of the hot water when winter turns into spring, then changing the location and continuing with the electric cartridge will of course be very expensive in the long run.
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