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I think the OP is put in the same position as many users. Who to trust and what's the yardstick to judge by. So let's see if we can give him a check list on how to choose an installer. I am not a heating engineer but when I am choosing an installer or any trade to work for me I want these in no particular order?

Do they have the correct qualification for the job, in this case G3 cert.?
Do they have a provable track record of satisfied customers I can call and visit and a rep they don't want to lose?
Do I want these people in my home, are they going to respect me and my home?
Do they have, and can supply proof of, sufficient public liability insurance?
Are they able to provide a maintenance program, annual G3 service, etc?
Can they do the work within an acceptable time period, even a guaranteed time period?


I am sure other more qualified will be along to add more to the list.

With regard to price, I just had a new boiler and 6 ft high Megaflow installed in a 10 year old house, which has 3 bathrooms, 13 rads, underfloor heating in a 5 X 10 meter extension, it involved removing pumps from 2 bathrooms and removing cws, and a very complicated plumbing of the pressure relief. This was done by a father and son team who I have known for years and do lots of work for me, long waiting list, very reliable. In and out in 2.5 days, all nice and clean, waste removed, power flush etc etc, £6000 inc vat
 
Go for a conventional system boiler, upgrade the cylinder and fit Trevi boost showers as the mains pressure boosts flow of the hot water. No electrics needed and quite (no noisy shower pump).
 

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