Does anyone know a reliable, capable installer operating around Cahors.
Normally installed by a plumber. Might be worth getting some local quotes. The energy companies would only sub the work out to the cheapest tenders, you have been warned. My plumber had to replace the aircon system completely end of last year as the electrician who did it when the house was built, used the cheapest Mitsubishi system, forgot to gas it and it ran out of guarantee after two years from installation. This plumber was the one who installed the air pump system and certainly know his job, hence why I say find a local who has a reputation to keep up and possibly a recommendation from neighbours who they have used.
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Whilst a plumber can make the connections, you really need the assistance of a heating engineer, they will provide the system design, the heat loss calculation, and the lower flow temperature a heat pump requires, the correct size of unit and emitters to do the job properly.
Its not a boiler so it needs the approach of proper heating engineer.