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The North Tyneside fab..

Of course there is...transistors are in everything and there's always been a demand for those that want the valve sound. Classic valves are reproduced by many manufacturers today and there's a vast no. of manufacturers producing valve equipment. Specialist valves are commonly used in high power...

The number registered has doubled over the last 20 years. The average age is now around 55 with very few under 40 in the trade. A significant no. only work part time and are semi-retired.

Don't touch any valves relating to the heating system...there's always a chance they'll leak. If the heating system pressure is say 1 bar cold or thereabouts it is fine Try isolating the cold main coming into the property (under the sink maybe?) and at the cylinder cold inlet to the pressure...

That relay requires you to energise the coil by switching the Neutral...prob. not what you want.

Have a look at Finder plug-in DIN rail mount relays... Untitled by Gasguru posted 1 Nov 2014 at 6:22 PM

You don't touch those immersion heaters. Normally with a cylinder heated by electricity you would have a duel tariff contract. The heater towards the top is only ever switched on to top up the cylinder if you run out of hot water during the day as that would use higher rate electric. The lower...

Are Toyota really any better or does a typical Toyota driver not notice so many issues? Certainly a few years back the company were a shambles, the firmware was a disgrace with pretty much every basic rule being ignored. Somewhere on the web are the Court transcripts that make interesting...

15mm drops to each radiator is fine. Read up on heating design eg. https://www.cibse.org/knowledge/knowledge-items/detail?id=a0q3Y00000IhQ78QAF

Tee into the 22mm...

2 is the Flow, 1 is the Return. Is doesn't really matter which way the TRV goes...far more important is that it can sense the airflow returning the radiator ie. don't jam it in a corner or behind a sofa. Assuming the heat load is miniscule in the new extension it shouldn't matter too much...

Are you saying the pressure gauge below the large orange box (the overheat thermostat) is showing 1 bar? It looks like it also shows the temperature in the underfloor loops too. A long time ago Nu-heat supplied Kee Triple pipe and sold adapters...they may have an idea of the pipes longevity. If...

The condensate is considered part of the boiler and despite your previous installer making a horlicks of it the work should be carried out by a reg. gas installer. https://www.diynot.com/diy/threads/diy-gas.8090/

It looks like he's used a rubber bung to convert from the white condensate pipe to the black waste pipe and due to the fact that the white pipe is not a standard size he's used a ton of PTFE tape to try and seal it. It needs a proper fall on the pipe and a solvent reducer.

Show us another picture of the connection on the right (& pipework). It looks a right bodge and the pipe appears to have cracked. The installer can come back and re-do for free or get a Gas-Safe inspection and they will force him to re-do.

It would require the mixer cartridge in the tap fitting/shower valve to be replaced. Depending on whether those taps/shower valves have been installed correctly and how old they are determines the cost (and whether available). Another option is to fit non return valves on the hot feeds to the...

Yes 2 port valves (with a thermal actuator I'd guess) for each zone...2 downstairs and 5 upstairs by the look of it. But overall a single Honeywell for the entire heating zone. I'm guessing the prog stats operate the thermal zone actuators, when they open their end switches operate and they...

Looks like there's only a single motorised valve for all the heating (the other one is the cylinder). What's the pressure gauge showing just above the large orange overheat thermostat?

Not so fast :) Now many years ago Keston made the worst boilers in the industry and very few gas engs. would even touch them (just not worth the agro). Some design aspects were absolutely dire. Originally Keston had a manufacturing facility in Romania of all places and they were an assortment...

The word is it's prone to leaking and the company (based in ROI) disappeared years ago. AFAIK it has no oxygen barrier in the pipe wall and hence the green bronze pump and plate heat exchanger to separate it from the boiler circuit. Nuheat used the pipe for a while so it might be worth talking...