hi, im going to run a new gas pipe in from the metre to where my new boiler is going to go. the distance is in the range of 15m. there will also he a 5 burner hob connected to this supply as well. i was going to use trac pipe so i can put it in position for the plumber to connect up. do anyone know the size of trac pipe i should be installing . 22mm or 28. your all going to say, ask your plumber, i wanted to install it before hand just to get it out of the way ready for the plumber to install new boiler. its a 3 bedroom house im living in. thanks for any reply, does it matter if 28 is used and its on the large side .