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Did you try increasing pump speed on new one?

Air lock, try turning gas off at boiler, Turn system on and alternate pump speed settings to shift air away from the boiler

Pump in the correct direction

Pump valve's fully open?

Apparently you can still hold a driving licence with mono vision. So you could keep your licence and not drive if not confident

Try Stella pans, we have had ours for over 20 years . They are really good quality and easy cleaning

You may have a pre heat hot water on your boiler, it will come on at random times , What make and model is your boiler?

Finish above floor, fixings for skirting

And the condese pipe from boiler is wrong size and a mess

Please don't be offended but I cannot believe you actually get paid for work when your level of construction and experience is so limited

Have the earth checked by a electrician, it has been said that a bad connection may cause pinholes in pipe work

How did the pile of rubble get there if access is only through your land?

Congratulations to all the family

You may need compartment ventilation, check the manufacturers instructions

Pretty sure your waste pipes are 40mm, this is undersized. A vent pipe is a pipe on the system that is taken high up and left open. If no vent is installed it can create a vacuum on the system and you have trouble with the water not discharging properly. Maybe worth taking to the freeholder if...

18 KW boiler requires approx 1.8 cubic metres of gas . 15mm copper pipe at 3 metres length, capable of discharge of approx 2.9 cubic metres

I would have run it in 22mm . However it will not be a problem regarding pressure drops etc

Pipe work looks undersized. Would also help if it was vented high up

It could be possible to do a air pressure test, or maybe a bung at manhole and water test depending on pipework

No, very costly to run unless you have a super insulated property.