22 MM SUPPLY TO METRE

In the no circumstances are you allowed to use plastic pipe inside the property as a gas pipe

The gas pipe will definitely need upgrading to 22mm or more depending on the boiler KW. It definitely should NOT be plastic pipe, but they could be using GFS Flexible Steel Gas Pipe, witch can sometimes look like plastic pipe if you haven’t used it before.

Good Morning, A combination boiler will need a greater gas supply - they generally have a much higher heat input that a heat only boiler so need more gas to burn. Upgrading the gas pipe from 15mm to 22mm is correct. It may even need a little 35mm of pipework given the size of the run an input of the boiler in kW. However, never in plastic pipe. Gas should never be transported in plastic. It has to be rigid copper, clipped and earth bonded. There is a flexible corrogated steel pipe called tracpipe, but it is still metal. Do NOT allow your pipework to be installed in plastic. It would be a RIDDOR siutaion if it were. I hope this helps.

Who ever you have got to install your boiler I would STOP them Immediately because the size of run of pipe you're describing is huge and would require a much larger sized pipe than 22mm diameter. When another gas engineer does a working gas pressure test at full rate on your beautiful new boiler he will have to cap it off because the boiler wont be getting enough gas to safely operate...

U shouldn't use plastic pipework on gas . If the new gas run is apox 20 metres from meter up to new boiler I would have thought u should use 28mm copper pipework from meter then reduce down to 22mm to new Combi boiler. All subject to gas tests after new boiler installation Thanks M T Plumbing & Heating Services

No do not use plastic on gas use copper pipe. Every gas engineer knows this.

-Plastic pipe is illegal -Gas safe engineer must do the job and who will decide what size of the gas pipe required - minimum 28mm copper pipe needed

Depends on the size of the boiler kw but it needs to be 28mm minimum from metre to loft then reduce down to 22mm to the boiler. Worcester boilers you I can only run a maximum of 9 metres in 22 mm. 15mm on any combi boiler is a definite no but where it reduces down to the gas inlet valve on the boiler , that section needs to be minimal

Hi The pipe would need up scaling, but depending on my many bends and fittings would determine the pipe size. Plastic definitely not on gas Thanks jamie

there in nothing wrong with using barrier pipe,either pex or pb,22mm should be no problem with volume,but have you checked pressure of incoming main ?,waterboards must supply at a minimum of .7 of a bar,check at times of high local usage ie 6am to 9am and 4pm to 9pm,as long as it is well clipped and supported it will be ok.

By increasing the size of pipe you can increase the flow rate of the water but it won’t increase the pressure.

Pipework would need upgrading yes but you can’t use plastic pipe for gas

First of all if it is the gas supply they are talking about then it cannot be in plastic pipe. 20 meters of pipe sounds like quite a long run of pipe, so yes definitely will need 22mm pipe to new boiler, but you may also need a section to be 28mm. This would have to be surveyed on site and calculated correctly.

Piping materials Steel, copper, brass: The most common gas piping is black steel. Galvanized steel, copper, brass or CSST (Corrugated Stainless Steel Tubing) also can be used in some areas, but some utilities specifically prohibit the use of copper. In other areas, the use of copper is widespread. You should know what is acceptable in your area. Steel piping typically is black with malleable iron or steel fittings.

Hi usually with most newer boilers there will be an upgrade in pipe to 22mm..it should be already 22mm if it's a third floor flat coming off the meter..so I would check that..you can't use plastic pipe for gas period internally...unless its external I.e coming from the street to the meter. The only way you can get a "flexible pipe" internally is by using trac pipe..its a semi rigid steel pipe that flexes a bit more..but to answer your question plastic can't be used indoors on gas...the only way you can use plastic is if your using it as a sleeve to protect the cooper pipe.

This would all depend on what your current standing and working pressures are as well as your flow rate at a full bore mains water outlet. As combi’s only have a 15mm mains water connection to them, generally a 15mm incoming main is adequate. If they are suggesting upgrading to 22mm I would be asking them where they are taking it up to, the only correct way would be to bring it into the property and teeing it 15mm dedicated to cold supplies and 15mm direct to the combi. If this is not their plan then I would question it. Secondly, depending on the brand of plastic pipe, the bore of the pipe could be reduced by the inserts needed in the pipe at each fitting providing you with a similar flow to what you already have if your current mains supply is copper.

What pipe are you talking about? cold water main? gas main? As far as i remember you can use plastic gas pipe externally but internally the pipe has to be in copper. The Gas Safety Regulations prohibit non-metallic pipework from being installed inside buildings, unless within a metallic sheath, constructed to prevent the risk of gas escaping into the building if the pipe should fail – for example, in the event of a fire. So ask your installer to show you a written regulation about installing plastic gas pipe inside the property.

Firstly make sure the engineer pipe sizes this correctly I would think the first part of the pipework would probably need to be bigger then 22mm. The last thing you want is to get a year down the line and have a different engineer service your boiler and have to cap you off because your boiler isn't getting enough gas. Secondly, make sure they DO NOT do it in plastic as this is defiantly not allowed. If they are planning on doing it in plastic get someone else in because they are clearly cowboys/girls