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You don’t know much about gas do you mate? Have you tried the woodwork section of the site? Do you know about melting points? They’re not an issue until you have something out of control such as a fire. The temperatures achieved in a fire will melt copper. Around 1200 c iirc. Safety is foremost...

There are rules for boiler tails to prevent rupture on excess pressure/temperature. If followed, good as any material. Especially in a fire.

Old Duffers wouldn’t understand the benefits of plastic v Iron. Durability has to encompass thermal expansion and movement. Cast iron was never very good at this. Plastic is fairly corrosion proof and is happy to move a little if necessary. I know which I would trust at minus 20C

Probably an air lock

The end user pays for the VAT regardless of who fits or buys something. Anyone should know that. Everyone in the middle is a tax collector.

That is just a battery operated switch. Live in live out. Or volt free in and volt free out.

It’s your heating pumping over when hot water is heating by the sounds of it!

Backplate elbow and cut down to length to suit depth. Loctite string on thread.

These things happen. Don’t blame your tenant. Expensive doesn’t mean quality!

Fit a timer to the secondary pump. Time the hot water and get motorised valve checked. It’ll cost you a fortune the way it’s being used. Secondary circulation only at peak times of usage.

If your boiler is faulty out of the box, it’s your problem not the installers !

Put your little finger in it while you are cutting it! Follow me for more useful tips!

Emery cloth is best.

Good boiler. Keep it! Better than the crap we fit now! They can be mended. Unlikely to break!

It could give you a massive headache! It would alter the hydraulic balance!

Steel pipework shouldn’t be used on fresh water systems ! Galvanised was used when necessary but not recommended due to corrosion! Without seeing the pipework it’s hard to tell what’s causing your discolouration. Pictures would help.

You don’t need one ! Buy a pump and some inhibitor instead! You’ll need new pump valves too!

It’ll need replacing mate!

Give it a little time flushing through and see if it settles down.