New combi boiler - 15mm gas pipe

RCM · 6 Mar 2008

Hi,

My combi boiler has packed up and needs replacing. I've had someone round to give a quote, and he reckoned that I'll need to have my gas pipes replaced as they are only 15mm guage.

Does anyone know of any modern combi boilers that will work with my existing pipes? Is it worth getting someone round to see what the pressure in my pipes actually is before replacing them or are 22 mm pipes the only way to go?

Thanks,

Rachel

Gas2Air · 6 Mar 2008

Why so tight on the supply? All condensing combis require 22-28 feed within 600mm to boiler as per manafacturer instructions. Unless you want pee poor hot water performance for instance.

Nixt · 6 Mar 2008

RCM said:
Hi,

My combi boiler has packed up and needs replacing. I've had someone round to give a quote, and he reckoned that I'll need to have my gas pipes replaced as they are only 15mm guage.

Does anyone know of any modern combi boilers that will work with my existing pipes? Is it worth getting someone round to see what the pressure in my pipes actually is before replacing them or are 22 mm pipes the only way to go?

Thanks,

Rachel

You've just had someone round, so either it's not been explained properly or you've totally misconstrued what might have been told to you.

Most OP's post repeatedly on this subject driven purely by a desire to cut corners after being told something they don't want to hear.

RCM · 6 Mar 2008

The shortest route from the gas meter to the boiler requires drilling through three walls. I've got wooden flooring I'd really rather not take up so it's impractical to run the pipes under the floor. It's a small flat and there really isn't anywhere else the boiler can go so I was hoping to avoid the hassle of having to replace the piping.

Gas2Air · 6 Mar 2008

You've had 1 quote i take it? Maybe he didn't want the job? You need to get 5-6 quotes and maybe there will be a solution in most cases. What make is the boiler and what's wrong btw.

RCM · 6 Mar 2008

If by cutting corners you mean doing it cheaper and with less hassle then yes quite frankly. I probably should have grilled the guy I had round more on the subject but I felt a bit awkward suggesting that he was creating more work than necessary.

I'll have a search for the other threads you mention.

Gas2Air · 6 Mar 2008

RCM said:
If by cutting corners you mean doing it cheaper and with less hassle then yes quite frankly. I probably should have grilled the guy I had round more on the subject but I felt a bit awkward suggesting that he was creating more work than necessary.

I'll have a search for the other threads you mention.

It's not cutting corners nor creating more work for your expense! IT is a requirement for a fully functioning "modern" boiler.

Nixt · 6 Mar 2008

RCM said:
If by cutting corners you mean doing it cheaper and with less hassle then yes quite frankly. I probably should have grilled the guy I had round more on the subject but I felt a bit awkward suggesting that he was creating more work than necessary.

I'll have a search for the other threads you mention.

Your RGI should have calculated the pipe run. As you've been informed of the result, no-one on here has reason to doubt them.

Using an undersized gas pipe is illegal and dangerous, hence the firm reply at your vain attempt to get round it on this forum. If by getting others in you hope to find someone to take it on and cut safety/legal corners then no doubt you will probably succeed. Hope you don't ever talk about rogue traders thereafter though.

RCM · 6 Mar 2008

Ah ok, I probably should have searched through these forums a bit more carefully before posting. Judging by the reponses in this thread (//www.diynot.com/forums/viewtopic.php?p=211000) you've been over this topic a few times before

You're right Gas2Air I've only had one quote so far, so I'll get a few more and see where I am then.

Thanks.

superdupergasman · 6 Mar 2008

It would be interesting to know if there is a conbi out there with smaller than 22mm connection?

Most, if notm all combis will require 22mm and often state in there instructions that under no circumstances should the gas pipe be reduced in size from that of the connection to the boiler ie 22mm.

If you were to source a boiler with a smaller supply ie 15mm you will find the power output low thus providing you with poor hot water.

Bite the bullit, get the work done and you wont regret the short term disruption against the next 10 years of great bath and shower experiences rather than getting cold standing under a dribble.

tonybhoy · 6 Mar 2008

Nah,loads of combis with 15mm connections,Vokera/Sabre for one (35 KW bolier)and Halsted for another.

Corgigrouch · 6 Mar 2008

I was shocked at the attitude of one customer who I visited to give a quote to for a new boiler.. She had a 30Kw floor standing boiler on 15mm with her hob tee'd off the same supply... She thought that the hob going out whenever the boiler kicked in was a twee characteristic of the house

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New combi boiler - 15mm gas pipe

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