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mate suffered this every time neighbour used tap fitted simple shock arrestor straight after stop cock and it solved it https://www.screwfix.com/p/flomasta-vessel-shock-arrestor-1-1-2-bsp/905fa

historically oil has usually been more expensive than gas hence why most people when given the chance change to gas

possibility they are still connected and just capped off Remove the box and loosen them off a bit see if they weep if not loosen a bit more at a time

you wont cause a leak just break the bits off as none of the box forms any sort of seal with the gas service . The black ring is possibly just like a big circlip holding pipe to box Then you need a mark2 surface box when replacing it...

yes it can be reused . as per Page 14 in the instructions from your link ...

its perfectly ok to fit it on the flow

no chance whatsoever of causing a leak

cylinder stat is also placed far too high on the cylinder and temp is low at 50 Filter on expansion pipe ? Not the clearest of photos but it looks like your pump is on the flow into cylinder

No solution to your problem but in the hundreds of plates i have had out changed/cleaned etc i have never seen anything that resembles how gritty that looks . In one side of the plate let along both sides . Very strange

What sort of system do you have combi/heat only Where they all working before you changed them

just watch the red one with nothing being used in the house check it 15 minutes later and see if it has moved

there is an auto vent on top of the pump usually screwed down Noise on the instants on pre heat was usually a whistling sound associated with the divertor valve

Go and check it see if its registering you may have a leak under the floor

is your heating on when you hear it that looks like a central heating filter

yes there is as they can and do freeze

not strictly true failure of the gas valve / thermostats and other components can keep a boiler on in fault condition causing the pressure to rise as expansion vessel cannot accommodate the amount of expansion from the heat being generated

which can be dealt with with chemical clean and hot and cold flushes in the vast majority of cases . But then again that doesnt generate £££ for unnecessary work

Taking rads off and flushing them outside with a hose is going to clean them far better than a powerflush

yep the biggest boiler manufacturer in UK needs to take advice from JOHND and older plumbers need to stop adhering to manufacturers instructions on how to fit their boilers despite this voiding warranties. . oh look here is ideal also saying the same . . . 5 water treatment Central Heating The...

see rodders post . As i said some manufacturers do not recommend it