Does combi always need to be on external wall?

converted-lurker

Quick question, does a combi boiler always need to be on an external wall. The place we were going to put it is no longer an external wall but has a flue chimney (this is where old boiler is) - would this work?

Thanks

mysk_girl

Mine is just on an internal stud wall, you just need to be able to get the flue to the outside - ask the boiler installer how long a flue you can get away with.

rustyboy21

I am almost certain you couldn't put a combi boilers fluing system out of the chimney. The pipe would have to be extremely long and due to them being condensing there wouldn't be enough force to extract the gasses that far up a flue, they would cool down on their way.

You can do a number of bends on a flue pipe in order to get to an outside wall, but with each flue bend, you will shorten the overall max flue length.

If you have had an old back boiler in , in the past, have you had a look at the new Baxi CBBU which would take it's place?

You will have loads of engineers on here saying they wouldn't fit one, it is only down to the fact they are more time consuming to fit and more expensive, so the enigneer doesn't make as much on them and a lot of them don't know how to fit them anyway, as they didn't fit original ones. I know of 4 people who ave fitted them and they love them. Even a welsh council is fittting them into their homes as standard when refurbs are taking place.

ic

A flue on a room sealed boiler is both the air intake and exhaust - so assuming your old boiler only exhausted up its flue, the existing flue will not be suitable. They could replace it with one for your new boiler, as long as the run isn't too long. The technical specs of a boiler should include the max flue length.

Canucklehead

converted-lurker wrote: »

Quick question, does a combi boiler always need to be on an external wall. The place we were going to put it is no longer an external wall but has a flue chimney (this is where old boiler is) - would this work?

Thanks

Quick answer.


No.

Without knowing the layout of your property it is just about impossible to tell you what your options are.


GSR.

Sues48

rustyboy21 wrote: »

I am almost certain you couldn't put a combi boilers fluing system out of the chimney. The pipe would have to be extremely long and due to them being condensing there wouldn't be enough force to extract the gasses that far up a flue, they would cool down on their way.

You can do a number of bends on a flue pipe in order to get to an outside wall, but with each flue bend, you will shorten the overall max flue length.

If you have had an old back boiler in , in the past, have you had a look at the new Baxi CBBU which would take it's place?

You will have loads of engineers on here saying they wouldn't fit one, it is only down to the fact they are more time consuming to fit and more expensive, so the enigneer doesn't make as much on them and a lot of them don't know how to fit them anyway, as they didn't fit original ones. I know of 4 people who ave fitted them and they love them. Even a welsh council is fittting them into their homes as standard when refurbs are taking place.

Can you give me a rough idea on price please? We are in the process of planning a new kitchen and I'm trying to persuade DH to replace our old boiler at the same time which would free up a cuboard. The house origionaly had a back boiler and an ugly gas fire which we replaced soon after moving into the house.

rustyboy21

Sues48 wrote: »

Can you give me a rough idea on price please? We are in the process of planning a new kitchen and I'm trying to persuade DH to replace our old boiler at the same time which would free up a cuboard. The house origionaly had a back boiler and an ugly gas fire which we replaced soon after moving into the house.

The following would be the cheapest you could get away with, through plumbnation, but they don't really have a good track record, so I believe, would be dearer elsewhere

https://www.plumbnation.co.uk/viewcart.php

You would also have to factor in, possible pump system for boiler, new cylinder for hot water and labour costs which would also have to include going up on your roof and installing the new liner. You would also possibly require a new fireplace in order to hide the workings and install the electric fire.

It wouldn't be as cheap as this through an independant shop or installer, as they don't have the buying terms plumbnation do, but you would find it more difficult to install it if you bought it of the internet. A lot of installers insist they buy it, as after they install it, they would be responsible for it and have to answer for any problems via the manufacturer re installation.

It is a nice bit of kit, the fire quoted is the cheapest one, the other ones are nicer, but used it as an example.

You will find it virtually impossible to find a wall hung boiler which would be able to flue up the chinmey as they aren't made to do this. This boiler is. Before anyone asks, you will need to have the fire too, although sold seperately, it is for use as a whole unit, so any problems, the manufacturer wouldn't touch it without the fire being there. You can only have an electric fire with it too, no gas fires available. Anyone who says there is , is talking rubbish.

Sues48

Thanks, initially was looking at resiting boiler in loft or airing cuboard. BIL who works for BG installed previous boiler and fire, has a mate who has his own business and recons we could get that done for around £2000 but obviously it wwill be major upheaval, not ure if it's really worth it just for 1 extra kitchen cuboard:eek:

ed110220

AFAIK, there is only one modern boiler that can be vented up a chimney and that is the Baxi Bermuda BBU HE. It is a condensing boiler so it's efficient, but it's not a combi, it heats water to be stored in a tank. You will need to fit a new balanced flue for it though to fit in the chimney min. 3m and max. 12m long.

gas4you

There are several boilers that allow flueing up an existing chimney/ flue with a special new plastic balanced flue liner.

You will also need to have access for the condensing drain to exit the property.

New flues like this will cost a lot though.