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You can still do it, just yours is round as opposed to the hexagonal types. Be careful, use water pump pliers or similar to back it off. Maybe clean the brass on the spindle using a cleaning strip.

I work I social housing and the amount of times I’ve seen similar is frightening. Customers who have inadvertently knocked their boiler fcu switch off and these are in plain sight, but still call us out for no heating or hot water. At least yours was hidden to be accidentally knocked.

I do normally have a look and usually make sure it’s tight too. We have an option to pass it on if it’s not visible, I just wanted to know if the test I’m doing is ok. Vast majority of our properties have the connection where needed. However, some of our sparks aren’t arsed about it being after...

I usually get 0.2 or 0.3 ohms. Not sure if it’s the setting on my auto ranging mm.

Yes, that should be fine to swap out without issue.

I attended a job the other day and couldn’t visually see the main bonding connection and tbh didn’t have the time to pull the washing machine out and check. Is there a way to test if there’s a connection, or does it need to be visually inspected? Aside: I sometimes have to connect the bonding...

What did your installer say?

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?