back boiler gas fire unit b.b.u.

[desrob]

when removing gas fire back boiler to replace,do away with back boiler and renew with a new fire,can the liner remain.

 

[Atouchofgas]

I would not reuse the liner as its the same age as the bbu, and you cannot guarantee how much life is left in it

 

[Backboiler]

About 15 years shelf life. Re-new pal

 

[desrob]

I would not reuse the liner as its the same age as the bbu, and you cannot guarantee how much life is left in it

puts the price up a bit having to get on roof to remove liner.?

 

[Atouchofgas]

It may do but that's why I get a chimney sweep in and let the cust know how good/bad there lum is. Saved a few cust £££s

 

[stevetheplumber]

you dont need a liner if the flue is in good condition

 

[desrob]

you dont need a liner if the flue is in good condition

thats not the issue,my question is can i leave the liner in to save money and trouble removing it

 

[MK_Swans]

What is the catchment space being used for once the BBU is removed??

 

[desrob]

What is the catchment space being used for once the BBU is removed??[/QUOTE and for new fire.

 

[MK_Swans]

If your putting a new insert in and the liner fits on to the new flue box then and there's no spillage whats the issue?

I know you would change it ideally, but if like me, you have an aversion to roof ladders the as long as the draw is good then I would think it was be fine.

 

[desrob]

If your putting a new insert in and the liner fits on to the new flue box then and there's no spillage whats the issue?

I know you would change it ideally, but if like me, you have an aversion to roof ladders the as long as the draw is good then I would think it was be fine.

to be honest mate thats what i'm wanting to hear,but not sure it right.?

 

[MK_Swans]

I haven't seen anything in the G2 to the effect that you need to change the flue liner. As long as it still does the job for which its intended.

As long as it's not spilling then I would be inclined to think it would be fine... To be on the safe side I would ring Gas Safe Technical to be sure and get it from the horses mouth so to speak.

 

[Backboiler]

If your putting a new insert in and the liner fits on to the new flue box then and there's no spillage whats the issue?

I know you would change it ideally, but if like me, you have an aversion to roof ladders the as long as the draw is good then I would think it was be fine.

Thinking in court means you thought the job through and you thought that much, you thought to look at the Mi's and the British Standards and complied. Good luck. Read the following exert from BS 5400
Commentary on 6.1.7.4 BS 5400 (1)
When replacing an existing appliance connected to a chimney lined with
a metallic liner, the existing liner should be replaced unless it is
considered that it can continue to operate safely throughout the life span
of the new appliance.
Under normal operating conditions, a correctly installed metallic liner
conforming to BS 715:1989

4)
or BS 715:1993
or BS EN 1856-2 should
operate safely for at least the operational life span of an appliance,
normally 10 years to 15 years

 

[mountainman]

In a nutshell, case closed eh backboiler! 🙂

 

[Boilerbud]

Would customer not consider replacing with new Baxi Condensing back boiler?
Boiler supplied with plastic flue and fire is electric.

 

[desrob]

Would customer not consider replacing with new Baxi Condensing back boiler?
Boiler supplied with plastic flue and fire is electric.

no...

 

[Billy Bob Bob]

If your putting a new insert in and the liner fits on to the new flue box then and there's no spillage whats the issue?

I know you would change it ideally, but if like me, you have an aversion to roof ladders the as long as the draw is good then I would think it was be fine.

wrong,totally mis leading advice pal,you have to guarantee the flue liner for the next 15 years,on a 20 + year old bbu its at the end of its life,dont be a tight arse hire a roofer,drop a new liner down,at the end of the day if that liners like a colander out of site you run the risk of killing someone

 

[GrahamM]

I am still learning in this profession and know I am far from knowing it all, but there is the odd time I am astounded by the lack of basic safety knowledge by some of the contributors on here.

Fair play to desrob who not being 100% sure asked the question. That is what this forum is for.

But, how many supposedly trained, gas safe registered engineers out there think it is acceptable to reuse a liner, possibly 20 years old, to install a new fire?

 

[Leo21]

Wasn't there a picture in the gas safe mag this week on this. Flue liner can only be used in conjunction with proper flue box. Liner needs renewing because of age. How on earth do you get on with vertical flues if you don't like roofs. Invest in a crawler, you soon get used to going on the roof.

 

[REDSAW]

last one i did with 'the gaffer' we pulled the old liner, got the chimney swept, gave it a spillage test then fitted the fire. job was done.

 

[GrahamM]

last one i did with 'the gaffer' we pulled the old liner, got the chimney swept, gave it a spillage test then fitted the fire. job was done.

The thing with fires is you got to be as close to 100% sure as is possible, the chimney is sound all the way up and will continue to be so for some time after the appliance is fitted.
You as the fitter are responsible for this. Unless you have a thorough inspection done or drop a new liner down, can you ever be sure it is in sound order?

Would "it passed a flow flow and a spillage test when I fitted the new fire last week!" hold up in court?

 

[Mickyplumb]

Don't take any chances bro with flueing for gas fires.

 

[Mickyplumb]

Also, FYI you would probably have a 125mm up there, min 175mm min if you go for a DFE

 

[Bernie2]

Hmm! Beside all the regulations and who says what stuff. We did a lot of HA work on BBU's and fire fronts. The old liners where usually rusty and fell apart many times. I would recommend not to reuse one just from what I have seen happen to them.