Is it a simple job to replace a conventional gravity-fed hot water cylinder
with a pressurised cylinder fed directly from the mains - or is there more
to it than that? ! My existing conventional cylinder has both electric
immersion heater element (never used) and an indirect heating coil fed from
the gas boiler.
It is straightforward as they are available in the same configurations as
vented cylinders but there's a lot more around the (far stronger) cylinder to
make it operate safely at mains pressure; pressure reducing, non-return
and pressure relief valves plus expansion vessel (either separate or built
in). You're not officially allowed to DIY the installation for safety reasons
and you're meant to have the installation inspected annually to check that
the safety devices are operational. These steps do add to the cost but as
another has said these systems are common and far cheaper in Europe.
One of my pals is a frequent visitor to France and picked up a system
there to install himself, and did so with no problem but certification could
be an issue if he was the sort of person that was worried about that sort of
thing when selling a house.
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