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Congrats! Sounds like a fairly smooth experience. Ours is planned for mid jan, in scotland, so I am looking at alternative accommodation as I don't think it will go down well with wife and child with no heating / hot water for a few days!
andos-
It was smooth in terms of the install, and the installers were efficient on what they were being asked to do, but I got the impression the planners don't really talk to the installers. For e.g.
the planners told us to demolish an old wall and install a new one to allow the heat pump to be wall mounted. that's fine - we wanted it wall mounted - but the wall mount requires an enormous bracket which, it became clear after installed, is so large it stops us opening our kitchen doors! If they'd told us a bracket of this kind would be required then we'd have just asked them to floor mount and saved ourselves three grand.
the planners told us that we needed a survey which found we needed a reinforcement beam to our attic to ensure the cylinder tank didn't crash through our ceiling. again, fine, but then the installers didn't install it where the reinforcement beam was!
finally they damaged our wall when trying to install a vertical radiator which I don't think we really needed. we were consulted on that so it's partially our fault, but we do now have a busted set of tiles on the wall which is a bit depressing.
Hopefully they'll resolve this stuff. Waiting on a response for them atm.
ReekBlefs
It's better for sure, but we were starting out from a very low base - we had an old immersion heater system, powered by gas, with very inefficient single bar radiators. Too early to be sure about cost savings (especially given that it's recently gotten cold so our energy usage profile has changed correspondingly) but we've gone from using 80% gas and 20% electricity to the opposite; and we're having to set the thermostat much lower to get to a comfortable temperature.
One thing to bear in mind - you'll have probably a few days during install where you don't have any heating or hot wat. That sucked in October but suspect it'll be worse in December. They'll bring mini heaters which help but try to be out of the house as much as you can during the middle part of the install if you've got the option.