the grand scheme as i wrote above does not seem cost effective only because of the heat pump. if it were cheaper, i would definitely buy it because radiators/solar water/solar panels are low/no maintenance while heat pump does have it.
>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.
Indeed, even with "free" heat from CHP you can get an economic net loss.
Every house connected is a lot if piping, most of it unproductive — heating empty space, and losses in piping. So CHP district heating work best with large apartment buildings, and worst with single family housing.
This way Danish 65C° district heating for detached housing may be the worst example of district heating adoption.
And even if you do have only commie block style apartments, you may still end with having to add extra heat from local boilers in very cold climates. There regions in Russia where heating eats 1/3 of regional GDP.
But an overall, does district heating makes sense? Hell yes, and it must be made mandatory in the West one way, or another, along with policies to prevent counterproductive outcomes.