buying house - 22 year old boiler

[someonelse]

traditional boiler in airing cupboard with hot water cylinder (+immersion).
It seems to work fine but I imagine it will need replacing at some point. My concern is the location. Airing cupboard is internal - no outside wall. I imagine it would have to be a new condensing boiler? So Qs are
* is that a correct assumption?
* does it need an outside wall to allow the excess water to escape?
* if so would that mean lots of disruptive new pipework to relocate the boiler?
* or could one use the downstairs loo which is beneath the airing cupboard
cheers!

 

[oldbutnotdead]

Yes any replacement gas boiler will have to be condensing. Your bigger problem could be the flue- if it's currently hidden in a chimney or similar that's a big no no.
Condensate/prv can drain internally, the loo below will probably work.

 

[bernardgreen]

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[someonelse]

when I poked my head into the attic there seemed to be a flue going up and throught the roof...

 

[CBW]

You could always relocate the boiler when you replace it.

 

[MeldrewsMate]

Yes, the condensate must be discharged into a plastic waste system, so as long as the toilet drain is plastic (not cast iron) then it would be suitable.
An alternative is to use a condensate pump.

 

[Mottie]

If you are an end of terrace or Semi detached with a flank wall, you could relocate the boiler to the loft. Thats what we did and it works fine. Nerxt door has their boiler in the airing cupboard on the landing with the flue going out the roof. Condensate is piped between the upstairs floor and the downstairs ceiling and tees into the bath drain

 

[gas112]

Yes, the condensate must be discharged into a plastic waste system, so as long as the toilet drain is plastic (not cast iron) then it would be suitable.
An alternative is to use a condensate pump.

cast is allowed providing it doesnt go in at highest point and so that water washes away any residual condense

 

[someonelse]

Thanks all.
Semi-detached.

At this stage a) not yet bought b) boiler is still working and c) I'm not looking to renegotiate price.

Just want an idea of how complex, disruptive and/or costly an upgade could be. I could of course pay an engineer to inspect and quote but it's pretty self-evident he'd say it will need replacing in the near future so I might as well wait till that moment before getting formal quotes.

From your helpful responses above it seems there are various options, not all of which will involve re-laying pipework all over the place!