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Replacing all rads or installing new system then they have to be sized for low temperature heating to meet building regs. Max flow temp of 55°C

Look for a couple of motorised valves. These are normally close to each other and are boxes mounted to valves on pipes. One will be on a pipe going to the cylinder. You can usually manually open and latch this to stay open, and whilst you have the heating on, it will allow heated system water...

Get someone gas safe (with fires) to diagnose the fault and service the appliance.

When was it last serviced properly?

Scaled up cylinder perhaps? I'd need to be there really. Can't do this at distance!

Think some who come on here must believe we are paid for our contributions!

Or just get a new tap.

Apparently there's a term for someone who seeks confirmation bias. I won't post it here as don't want to offend. But I will keep it for future use.

I have had several customers with similar issues and currently have 3. They are all salamander pumps. Worked fine for several years and then pack up due to age (normal wear and tear). A replacement (like for like as much as possible) is fitted by themselves/a friend/a plumber as it's a simple...

This ^^^

Get your plumber to check because, as you're not sure what you're doing, we can't rely on the info. No offense.

Seen this plenty! Bottom immersion fails and instead of being replaced, wiring just gets connected to top immersion... Always HA properties.

This is a new issue that hasn't been a problem in the past if I've read the thread properly?

https://www.northwichplumbers.co.uk/how-to-fix-plumbing-crossover/

Nope. That's a motorised 2 port valve. I'm referring to mixer taps in your bathrooms.

Probably need your plumber (make sure he is G3 certified if working on the UV cylinder). You need to be able to isolate the hot supply to the system and then see if water continues to run from a hot tap after 10 mins or so. This would indicate that a NRV in a thermostatic mixer has failed...

Sometimes it's unavoidable but generally not a good sign... Especially when you see it on a system that is having issues! It causes an experienced plumber to begin wondering what else the installers may have done! If extension was added then highly likely that builders did the extension to the...

Check for a passing mixer valve. Thermostatic shower or bath filler.

Plastic pushfit on copper says a lot imo.

Like I said... Balance ;)