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Henrad are Stelrad radiators re badged for independent merchants. Panel rads are finished by a electrostatic process where the paint finish is 'baked' on . Unfortunately rads do rust in bathrooms it's a damp place! I'd be taking care with the one that's bubbling may just be a pinhole behind...

As above check combi manufacturers instructions. Going by the hose union tap it looks like new cold connection was made on incoming supply to softener rather than softened side. If you can use softened water in your combi needs pipework altering. I'd be swapping those small flexi hoses for...

Vote for loctite 55 here used it for over 10 years at one point had a team of 12 . We use nothing else never yet had a leak . Can't say that about ptfe!

Each make of pipe has its own insert Depends on fittings make/type if it's demountable. Clear picture required!

Agreed that's a Y plan with a god dam awful airjec doing cold feed/open vent. Im betting that's full of crap. Cylinder stat should be higher up as well. Boiler stat needs turning down a bit they do get out of calibration.

Changing a number of rads indicates a serious problem somewhere. Get a magnet and check if pipework adjacent to pump and cold feed and open vent . If full of crap magnet will be attracted to pipework. Re quote just looks ott try getting someone who's experienced with your type system to look...

As above snapped spindle replacement valve only cure I'd fit a decent lever valve.

First move is to turn off all rads that are working see if the others come on. If they do system probably needs balancing.

Taping pin gently normal works. After that if your not confident in dealing with it you don't need a degree in plumbing you just need a plumber! We would just freeze pipe adapt it then fit new trv few minutes job but we have the gear.

As above try finding leak. If it's taking 6 weeks to drop pressure I'd be having a good look at all rad valves . Take of heads of trv's and dust caps off lockshields. Auto air valves if you have any can be another source of problems. Just fit a decent system filter, difficult to understand...

We have used many hundreds of polyfit fittings on first fix with zero problems. I certainly wouldn't be bothering to change undisturbed fittings . You can use speedfit fittings on polypipe tube but you must use the polypipe inserts. Most polypipe inserts are now black plastic they work...

That's one of the polypipe versions (polyfit) As above push collet in and pull pipe out.

Terrain was bought out by Polypipe many years ago. They then ran range down and totally discontinued it about 3 to 4 years ago. To be blunt i think your on a hiding to nothing. Maybe email Polypipe and ask if adaptors are available but don't hold your breath!

It's two screws lol

Absolutely take wires out of board replace with link If you do any work on system and have to drain or even just get rid of pressure that's time to remove switch. It's threaded 1/4 bsp so you just need a 1/4 plug.

Grant register installer here. Simple answer link pressure swith out they haven't been fitted to new Grant combi's for several years. We remove them every time we find them mostly because when your working on boiler they are renown for snapping off! From memory the pressure switch connections...

Today first powered flight 1903 Wright brothers at Kitty hawk lasted 12 seconds and covered 120ft.

Maybe a screwdriver slot under all that crud in center?

As above zero problems. We have been working on a large property near Scunthorpe for approaching 10 years. 36 loops in total all commissioned a few at a time. Last 4 due to work near Easter next year!

Never got my head round water saving toilets you have to flush 3 times! Had any number of conversations customers that rotate round ' you mean it won't clear the solids madam?'