..and you will get the finest advice available. I don't change bathrooms.
Agreed.
The only thing you change is your mind
Also look at two high flow combis:
The W-Bosch Highflow 550.
. W-Bosch are old hat. They are 5 years out of date. I would not touch a W-B, until they get the control system sorted and updated.
BB what is your address? I'd like to send you some salt & vinegar for that big chip on your shoulder