Qualpex question where can it be used

I had a friend of a friend re plumb a bungalow I bought. He is a qualified plumber but now doesn't do plumbing at all but specialises in boilers, he is fully registered etc but hasn't done plumbing as such for 15 years, he has another job not related to plumbing but his boiler firm is a weekend gig for him. He was originally going to install the boiler but I asked him if he would do the house as it's a simple job and he agreed.

The plumbing system has been re done as a drop down system so all the pipes are in the attic along with the boiler.

Have no issues apart from a few weeps on a couple of compression joints in the attic, rang a local plumber today and he asked me to send pics. He rang and refused to even work on it because in his eyes a cowboy did it and he wouldn't be held responsible if something went wrong.

I have had another plumber in previously who said it's a very good job the guy did considering he hasn't been a full time plumber in 15 years and was especially complimentary about the boiler piping saying it was one of the neatest jobs he had seen.

The boiler is all very neatly done in copper and it's fully within regs as to where the qualpex is joined to the heating system i.e it doesn't go near the boiler and any pipes coming out of the walls are all finished with copper tails.

Is there something inherently wrong with qualpex and compression fittings that would make this guy run a mile and say this? I tried to query him and his reasons seems to be bullshit and subsequently looking at his Instagram his boiler installs look like absolute hack jobs to me, messy copper runs and compression fittings all over the place. His main argument was that the air vents at the top of the drop downs weren't clipped in place but not sure what difference that makes as the pipe is clipped along the whole run every 1 metre, it can't go anywhere

If it makes a difference the guy I got wanted to do the whole house in copper but for cost reasons I said no to do it in qual PEX.

Just wondering is this massively frowned upon.. as I understand it now all houses are done in some form of PEX and hydraulic fittings now anyway so what's the difference between that and qualpex and compressions..

Sleeper12

Qualpex shouldn't be used at the boiler or coming off the top of the hot water cylinder. It can be used just about anywhere else. Personally I wouldn't like to see if coming from the floor or wall & going into the rad. Also using it as the cylinder expansion pipe isn't a good idea especially where it hangs over the cold water cylinder in the attic. It's too flexible for this & gets more flexible the hotter the water running thru it is.

https://www.boards.ie/discussion/comment/120467878#Comment_120467878

So it sounds like it's been used perfectly in this case then. Not sure why the guy had an issue