Temporarily extending a boiler flue

[Aquaheat]

What a c0ck!

Let him get on with it lads. I'm sure he'll bodge something up out if a bit of SVP and and old tin can or something!

With any luck the gene pool will start to look a little clearer.

Jon

 

[Jupiter01]

Charming

 

[Aquaheat]

Flattery still won't get you gas advice.

Thanks though, you're making me blush

 

[HootingOwl]

Depending on the boiler, you may be able to have the flue extended through the extension and out of the wall, but why you would want to do that is beyond me. It would only be possible if the flue parts were still available and the manufacturer's advice on maximum flue length was adhered to.

What you can't do is fabricate your own flue and lash something up. It will not work and it could easly kill someone.

Put the new boiler in first and then knock through.

 

[Jupiter01]

Thanks for the responses. An option that I had considered originally but discounted was to install new system (cylinder and system boiler) connect to existing heating pipes and rads. The reason I discounted this was the concern that all the crap in the current system would run through my new boiler and id much rather connect it to the fresh pipework and the new rads. Clearly the latter isn't possible because of the issues with existing flue and the challenges it presented for when I knock through.
A further thought - could I connect the new system to the current heating and install a magnaclen on the premise that this will protect against any crap making its way to the new boiler? I wasn't sure on how robust these filters are. If they were bullet proof so to speak, this configuration would allow me to get rid of the current combi, complete remaining work, install new rads and then connect the new boiler to the new pipework and rads. I would appreciate your views on this.

 

[Agile]

The obvious solution is to have the unvented installed and used with electric immersion heat for the moment.

But only a G3 qualified person can fit those!

Then use electric fan heaters until the new boiler has been installed and commissioned by a gas safe registered installer of course!

Simple when you know how!

It does not even need Dan to work that out ( if he wanted to anyway ).

Tony

 

[Jupiter01]

Thanks Tony. Is the magnaclen method not as robust as I would like?

 

[St0rmer66]

I'd go with the mangnaclean method but to add to it... I'd fill and drain the existing system a few times over to at least get rid of the suspended muck in the system before connecting up the new boiler. You could even put some chemical cleaner in now while you're waiting so that it's dislodged more before you do it. Then at least the majority is gone and the filter will be able to cope.

Do you actually know for a fact that the existing system is "filthy" or is it just an assumption?

 

[Jupiter01]

Thanks. Its an assumption to be honest

 

[muggles]

You could put a plate heat exchanger between the new boiler and the old system; that would provide total hydraulic separation between the two so the amount of muck in the old system would be irrelevant

 

[Jupiter01]

What sort of cost would I be looking at for one of those pal?

 

[Dan Robinson]

Depends how big....

 

[HootingOwl]

Go with Tony Agile's advice if you are worried about dirt in the system. Magnacleans are good but cannot work miracles.

 

[muggles]

What sort of cost would I be looking at for one of those pal?

Depends how big....

Dan has hit the nail on the head here...you've not revealed what size boiler you're putting in yet, so it's impossible to say how much one would cost as I don't know how big it needs to be!

 

[Agile]

If I was concerned about dirt in the system then I would use a gauze filter.

They stop anything and not just magnetic dirt.

But what surprises me about all this discussion is there does not seem to be a gas safe registered installer anywhere on the scene!