Is the following allowable

[nogoodatfaultfinding]

I have a customer who wants a combi installed as at the moment they have no heating (as in no heating was ever installed except Baxi wall heaters) and only an immersion for hot water.

They are insisting on on a combi and if i dont put it in they will find someone who will.
The biggest problem i am having is that they insist on having it in an airing cupboard in the middle of their house upstairs.

The whole of upstairs is laminated and they will not lift any of it.

They are quite happy to have drops throughout and gas running up outside wall into loft and down to where they want boiler but i cant figure out the blow off.

Am i able to tee the blow off into the condensate which will be installed with a punp of its own. This way if it ever overpressureises the pump will push it up and over and out!

Also has to be a vertical flue which with an extension going through roof there will be approx 1.2m of flue in loft space will this need a bracket ( I know its good practise) ?

Thanks
Charles

 

[Biggles..]

tee boiler blowoff back into the return,fit additional prv closer to a good exit point ensuring its operating pressure is less thanthat of the boilers PRV.

Baxi already do such a kit for their boilers.

Alternatively high temp plastic is allowed for unvented discharge so see no reason why not to run condense in say 1.25 high temp(generally specialist pushfit waste) with the prv terminating inot it via a HepVo trap.

Sorry just read pumped condensate,pump would have to be capable of taking high temp water,most condensate pumps wont do this.Seen plenty of boilers discharging all products into sumps(galv tank) and then a submersable fitted.Interlock boiler if pump fails.

hope some of that helps.

lee

Of course the flue will need supporting,thats a no brainer

 

[electronicsuk]

Amazing that they will not remove the flooring, presumably for aesthetic reasons, they are quite happy to have exposed pipework running through the house to every rad

 

[namsag]

Flue needs clipping at a maximum of every 1.8 metres if its going straight up without any elbows clip it to the roof truss ,clip should come with roof terminal kit