Oil boiler with flexible balanced flue

[morganb]

I've got a job coming up to fit an oil boiler in a utility. It's replacing an old boiler flueing into a lined chimney. The boiler is sited so I can't fit either a horizontal flue (even with plume management) or vertical. They're reluctant to move the boiler, or change to an external one.

I'm looking to fit a flexible liner down the existing chimney to the boiler. I've have fitted condensing oil boiler as an open flued with stainless liner before, but I'm not to keen to repeat that. I'm looking at the Grant balanced liner, but the only problem I have is it only goes up to 26 kW, the boiler will probably be a 26-35.

Does anyone know what kW the Warmflow balanced liner will go up to, if the Grant conventional liner is a decent piece of kit, or if any of the lesser manufacturers make similar balanced kits? Also how difficult is a balanced liner to get down a chimney, the run is about 4 metres vertical then another metre at an angle.

 

[lame plumber]

cmon, time to tell a few porkies and get an external boiler fitted, why make life hard for yourself.

 

[WHPES]

Your boiler is over 26kw. Is it a huge house?

You are best with the Grant high level banalced flue kits. I have fitted loads of those. You need to check that the liner will fit down the existing chimney. I wouldn't touch the Warmflow one with the proverbial end of a stick!

Having said that when customers see the estimates for both options, the usually go for the external boiler in the end anyway as the flue kit and fitting can often add well over £1,000 onto the job by the time you have messed about with the chimney stacks etc.

 

[morganb]

24 radiators, 250 litre unvented and an annex to be plumbed/heated at a later date so fairly large domestic.

I've given them a price for both, they are similarly priced so it's up to them what they go with. For me I'd quite like to try the balanced liner as it's an easy one to do for my first time. If it needs the 26-35 then I've just gone with the external.

 

[bigads28]

I've only fitted the balanced flue liner on a gas fired back boiler with no end of problems because of flue chill. The water used to run down onto the fan and blow it.

The gas boilers were condensing so flue temps were low and made of plastic. Do the oil ones suffer from similar issues or are the temps higher?

Slightly off topic but I didn't realise you got these liners on anything else.