I'll be honest... probably my most expensive regret...Exciting. Thanks for documenting! Nice plumbing layout too.
We recently had a decent system boiler installed, replacing a jerry rigged to shit monstrosity the former owner had molested the absolute life out of...
I wish I'd have done way more research into ASHP systems and planned this whole system in one hit.
Goverment grants this side of the pond means that it'd be a similar price to what we paid for the traditional boiler.