The descale is really easy to DIY though, you can buy a kit for under $200. Takes under an hour and most of that is you drinking a beer "supervising".
I'd just say make sure the one you get can handle the required temperature rise at the volume you need. Water inlet temp is colder in winter, but the ratings on the things are typically for best circumstances. And one with a built in storage tank to cover the first demand call, or a full house circulation, but that could be tough depending on access.
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