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They’re usually ok to work on hot water as they circulate around the plate heat exchanger same as using it in summer mode. Your mates must have been something different. They usually have sensors/ntcs to prevent overheating

Are the flow and return valves under the boiler open?

This makes no sense. Have you confirmed correct voltage? Is it on a plug-top or hard wired?

And how do you think the used hot water gets replenished to be re-heated?

No, not really know what's being said @ericmark, but used to threads occasionally going off tangent

Usually orange and grey

Would be easier to remove the head and link the 2 switch wires.

It depends, if it’s not too far down to the drain connection, then maybe upgrade to pvc to that point and use a cast to pvc adapter, eg Fernco. If not a viable option, then maybe x2 fernco, a bossed pipe or piece of pipe and strap boss.

I haven’t used them but I have one of their pop up wastes and they’re ok for the price.

That looks like it’s been bodged onto a cast iron soil pipe and then bodged even further with the bath waste and loads of silicone. Were you feeding and tending to the horse whilst the work was being done?

Great, Ohm's law i can do!

Not adjustables as they don’t have the required grip. Water pump pliers, mole grips or similar

Would maths be needed for inspection and testing of domestic properties and/or is that not something I should venture into?

Great and thank you. I shall have a read.

At this stage,I’m not entirely sure. Probably just the domestic stuff like wiring and lighting. I work in social housing and have some basic knowledge but would like to back myself more when talking about things. Yep, certainly lost at the moment with indices, algebra or anything else :sad...

but the room sealed boiler is freely vented to outside, so not a clue how one tests it is room sealed, maybe some form of smoke generator? Aye you could, but combustion performance analyser (CPA/FGA) would be more suitable and what a gas engineer working on boilers should carry. As for an...

I want to learn more about electrics, not necessarily become an electrician, just more competent and professional in my existing gas engineer role. I try to take as much information as I can from reputable sources, such as @flameport ‘s website/YT channel. However I thought I would try and teach...

It could easily be changed at this stage as well.

Should be doable depending on your hole and depth size. The bracket should go underneath, if you’re struggling maybe pay someone?

Not unless they’re used in Baxi boilers :ROFLMAO: :ROFLMAO: