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If it is a unvented cylinder and that pipe is a discharge pipe, the end must be sited outside as close to ground and cover with guard grille. That way, if there is something wrong with cylinder, the PRV or TRV will open, release water, sometime very hot and steam, it is discharging safety...

Take it all out and rerun new waste pipe with a correct fall toward the soil stack, leaving as it is could create blockage and smelly water hanging around dipped pipe. Daniel

Where do the 28mm copper pipe come from? Hope it isn't coming from unvented cylinder Daniel.

Op, you doing just fine, I've done thousands of fittings and never had any problem. It all about gravity, a bit of blob will always appear at bottom of fitting, it will be fine. I have a MAPP Gas but it has adjustable knob that reduce heat, making it useful for different size of fittings...

Don't run the the hot water taps, that's a waste of water lol. Switch on hot water only, on the programmer. The pump will run and get the flow and return between boiler and cylinder going, this will usually clear up air lock in return pipe. Daniel.

I would go for cold storage cistern, hot water cylinder and system boiler. What sort of accommodation have you got? Bed and breakfast? Daniel.

Give it time, it will clear up in time as the air will come out via the vent pipe or the radiators which you bleed later. A tip, after refilling heating, run the hot water only and the pump will clear up flow and return pipe between boiler and airing cupboard. Daniel.

Gas steel pipe ( screwed iron pipe in old day) was in used well in the 90's You have never heard of liquid bitumen? In the old day, screwed iron pipe were laid on top of concrete base and then bitumen tar were pour all over concrete slab including the pipe then screed over. The tar act as DPM...

I prefer to use sleeve cos if water pipe freeze in winter, it could spilt and leak water into cavity and you don't know it. Daniel.

It will not work. It only work in one direction. Daniel.

Don't bother, renew the bath, get a nice steel bath. Daniel.

Can't you ask the installer who did the boiler change, they may know what it is. Daniel.

Got my multi tool for that, easy done. Daniel.

You may need a tap extender as the new tap's tail is shorter than old cross head taps. The left tap look like 15mm copper pipe and 22mm or 3/4inch imp copper pipe on right. Left tap look easy but right tap a pain to get due to copper overflow. Daniel.

Op, as the heating pipework is iron, I wouldn't bother repairing it, as the heating is now sealed and higher, will cause some joints to leak or corroded pipes to pinhole leak. I would abandon it and run new copper pipework, drop from loft to each radiators. Ken, pump don't increase pressure...

Is your boiler Baxi, by any chance? Daniel.

Mira Excel shower ( one with pump ) is unsuitable for main fed, higher flow rate may affect normal working condition of shower. Op, have you got heating radiators that is fed from ground floor? There might be leaking pipe inside concrete floor. Daniel.

I thought those are illegal and not allowed under water regulation, due to risk of back flow from dirty water into water main. Daniel.

What pan has you got? Close coupled or low level pan? Daniel.

I think it is definitely ceramic, look at the price. Daniel.