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@wvm
My earlier comments refer to pressurised hot water systems and, I think, the tank components only. That's the area that can go bang if a fault developes.
Similarly, with central heating, the danger area is the boiler. Pipework, I believe is OK.
I'm pretty certain that it's fine for anyone to fit a boiler, plumb it in, etc. but it needs a qualified person to make the gas connection and commission the unit.
^All bar room lawyer talk!