Catch 22 - new boiler, extra rads, new roof flue

[kirstent]

Hi Guys,
I'm hoping someone can help us decide an order in which to proceed with our extension jobs.

We are having a 2 storey side extension which will add a bedroom with ensuite and dining room. Also having a reroof which is now felted and half slated.

We have an old combi which barely gives hot water and needs to be replaced. It is in a landing cupboard and flues vertically through the roof and the new condensate drain can go into the shower pipework through landing cupboard wall so all OK with that.

We want to get the new boiler put in and flued through the felt now so that the roofer can slate and lead around the right flue and we don't wreck our nice new roof but the extension is still just a shell with roof but no plaster, doors, windows etc.

We will be adding 1 or 2 new rads to the dining room and 1 rad and a towel rad to bedroom/ensuite which will all be added to the end of the existing heating runs.
When we get the boiler replaced we are expecting to have a powerflush and inhibitor added, but we will then need to add radiators. Will we need to drain the whole sytem to add the new radiators then reclean, refill and add inhibitor? Is that a good idea?
The existing rads have TRVs and open/close valves at other side (sorry, can't remember what they are called) so can we just close and drain the last rad then alter pipework and refill/top up inhibitor?

The other alternative is to get doors and windows in, electrics and plaster on, then do boiler, rads etc in one go but that could take a while and the roof would have to be left until later and it's getting cold!

Your opinions and advice would be very, very welcome so we can prioritise what we do next - being in by Christmas is becoming a distant dream!

Thanks, Kirsten

 

[Agile]

You seem to have it in your mind that things can only be done in their entireity.

I dont see any problem fitting the vertical flue NOW and the boiler later.

Of course you would need a helpful installer and I sppreciate that many are not as helpful as I am and just want to come and finish the job all in one go.

Tony

 

[Agile]

as far as new rads are concerned then if the installer fits full bore valve to system connection points then it will not be necessary to drain the whole system when the new rads are added.

Just needs a little planning and a helpful attitude!

Tony

 

[dcawkwell]

Move combi boiler to kitchen.
Therefore not a problem. Flue straight through wall as normal
and slightly cheaper flue.

 

[kirstent]

Thanks guys for the responses,

dcawkwell - moving boiler is a possibility and we considered it, but a lot of pipework would need to be moved and we are fortunate that where we would add new rads, the pipework is ready exposed due to ceiling being pulled down for knocking through into extension. Plus, having the boiler upstairs means that the bath and shower are less than a metre from the boiler so run hot quicker - we have to wait an age for hot water out of the kitchen tap tho!

Agile - full bore valves an excellent idea and one we hadn't considered. Husband has removed an unneeded rad today and putting a valve on that 'leg' will indeed mean we can add all rads to that run at a later date so we are basically ready for boiler change right now!
Re the flue, the new one will land about 150mm away from current one so we can't have both new and old in at the same time - roofer will have to hold off till boiler is swapped but that has suited us and him so far - he's just done a day here and there to give us time to insulate/put up fascia etc.
We are also lucky having a flexible gas installer - he's already come twice to move gas meter and resite gas pipe I'm sure won't mind fitting stuff in.

Many thanks - problem solved!
Kirsten