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if they are all working ok now if you put 28 from meter to existing youlll be fine it loks like your loosing 1.5 of 22 up to existing meter so only adding 6.5 stick it in in 28 if the appliances are low add a bit more but i doubt there would be a problem
 
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My personal opinion would be to run the new pipe in 28mm under the floor even if it didn't need it. My reason would be that there boiler in at the moment is probably ok off it now but if in the future they want it ripping out and a nice big combi installing then chances are they will have to upgrade the gas to cope, so as someone has already said it's just future proofing it and it will be cheaper and easier to do it now than having to rip up floor boards etc in the future. I would explain to them why you want to do it like that and most people would probably go for it.

As for your question about why you hardly ever seen 28mm is that a lot of new boilers installed the gas pipe is undersized, people just put them in and not think of the gas pipe they just see 22mm pipe and a 22mm connection and connect it up. If you size the pipes then you will see that if you have a combi and a cooker and a decent run 9/10 it will need some 28mm.
 
After all this, he phoned me this morning and said don't worry he is going to get the people moving the meter to make the connection. Suits me, i know he wouldn't have gone for a whole new gas run. I had it in mind to do what Steve has said. 28mm up to existing. (if sufficient)

Will be interesting to see what's there when i go back in a couple of days to pipe up some rads. It's all being buried, and they will want a combi in the future.
 
I can see why people over charge for work now. I was supposed to do this job Sunday (the rads and heating pipes, not the gas) He said he doesn't have the rad valve yet so can I come a different day or do it at night. I said yes, got a text today saying can't go tonight as he still doesn't have the valve. I told him I can do it wed and thurs night, if not it will have to wait until next week as I am booked up for the weekend. I doubt I will get to do the job now.
 
After all this, he phoned me this morning and said don't worry he is going to get the people moving the meter to make the connection. Suits me, i know he wouldn't have gone for a whole new gas run. I had it in mind to do what Steve has said. 28mm up to existing. (if sufficient)

Will be interesting to see what's there when i go back in a couple of days to pipe up some rads. It's all being buried, and they will want a combi in the future.

I had low pressure on a meter last week, provider came in and moved meter further away from the boiler. They piped it in 22mm, when I went back to check the wp at the boiler. It was wrong, they had to come back and re pipe it in 28mm. And this is the provider! Makes you wonder.
 
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Go on Youtube and they show you how to fit trac pipe and Gas tite.

When I worked in the training centre, I got approval to run the tracpipe course, it's only a few hrs, run through installation etc then do a multi choice question paper then you get a trac pipe certificate, we used to run it as a freebie for courses that were already booked and paid
 
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