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That sounds ideal. One easy tip (which they’ll design for anyway but worth looking out for) is to spec the rads / UFH for a max temp of 45 maybe, rather than 50 like ours. Also have a look at Homely. I installed it myself and I like it, although I think the Vaillant controls are way better than our Samsung so might not be worth it. You’ll also have a pro to come back and tweak it.
Ours is fine but the installers (now bust) only set up to take advantage of the grant so weren’t invested in designing the best possible system. Rads could be bigger, pipe runs a bit more optimised, could almost certainly ditch the low loss header or buffer.
dbr
A friend who runs a small eco heating company is doing it. He’s been in the game a while, and did the Grand Designs ‘healthy house’ MVHR/ASHP install, so I trust it’ll be done properly.
What are the shortcomings with your install?