I agree with checking radiator valves and any compression joints for signs of white or green staining/corrosion.
Some of the leaks are microscopic.
Check around the pins of the thermostatic radiator valves when you remove the heads for any sign of corrosion - often white in colour.
Also check...
As above. Faster hot tank heat up and same for radiators circuits when hot water isn’t also on. Have your heating timed to come on immediately after hot water is timed to go off
For starters, - did you try to adjust the pressure on the original oil pump? Often people mess with them and turn the pressure adjusting screw, typically when wrongly thinking they can bleed the oil line there.
Also did you check oil flow okay - oil filters clean at tank or wherever?
Did you...
If you have a plumber, then seems they know nothing about gravity hot water systems.
On looking at the photos, I think you have 2 hot outlets - the usual hot outlet horizontally from top of cylinder with vent, plus you have a second separate hot outlet at left side of cylinder (immediately...
Shouldn’t be an airlock as mains pressure at 3 bar will easily blast out any air.
Check valves in shower valve or built in filters perhaps faulty or blocked with debris? Hot water pipework filters particularly likely to have blockages
Maybe a blockage or the shower is faulty - not having all elements working (which would mean very poor flow when achieving suitable hot enough temperature.
Check you have cover on correctly with temperature & flow spindles and knobs in proper position - ie, fully on for hottest temperature etc...
It is a bypass valve, the purpose of which is to open automatically, but only when needed to create a bypass. They can sometimes begin to create a noise. Best to get it checked out or possibly replaced as it needs to be at a fixed setting so to open only when system needs flow through it...
Do you have the Aga properly serviced? Maybe stating the obvious points but my first thought would be the steel pipe feeding the Aga burner gradually narrows with carbon & has to be carefully cleaned, literally drilled out each yearly service. The wicks not as important, but need to be replaced...
Never did try to scare the OP Ric!
But I wouldn’t take any old excuse or lies from anyone responsible for something I am paying for.
Flux on all pipes is a tell tale sign of careless work. We wouldn’t accept a painter to leave paint splattered over floors or windows would we?
I have seen flux...
If he does say that flux isn’t corrosive, - ask him is it okay then if you do him a favour and paint his van wheels with same flux to ‘protect’ them from corrosion. Lol!
I suggest leading the plumber into admitting he is in the wrong by asking him - Is flux corrosive?
Hopefully he will reply, Yes, and then gives you the opportunity to say politely “That’s what I thought, so I cleaned all the flux off those joints after noticing it.”
Polite reply here, but firstly stating the obvious maybe, - second hand boilers are a big risk and will require overhauled. I hope you paid little or nothing for it.
Secondly, - since you have no idea about connecting the oil pump, you obviously won’t have the know how to install and commission...
You have an unvented hot and cold water system.
Your heating system is a sealed system (as it has no small feed tank in attic to fill it).
The Megaflo cylinder will be ideal for you as it gives better flow rates of hot water than a combi boiler would. Perfect for larger homes with 2 or more...