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https://www.racold.com/heat-pump-water-heaters

>Our heat pump water heater comes with a 2- years warranty and a dependable service for the inner tank.

this is like the premium heat pump contract manufacturer. good brand with a good reputation.

roughly 10 years is what the installer told me. refrigerators in india come with a 5+10 year warranty usually so this 2 year warranty is indicative.

The internet tells me that split-ac systems (basically small heat pumps) have a life expectancy of 10-20 years. That's not too bad, for example an oil-based heating system (as we have in our german basement) also only has a life expectancy of 20 years and has way less moving parts.

My oil based system is 45 years old but no part in it is the original one anymore, so with a certain maintenance cost spread over the years you keep it living indefinitely. Does the ship of Theseus concept apply also for heat pumps, or there you have to throw it away after 10 years?

Cost wise it only makes sense if you have photo-voltaic on the roof. In Germany there is more acceptance of paying more if there is a (possibly perceived) environmental benefit.