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.
Kev
Every hot water system in France is done that way, though they are most often only electrically heated. You can get cylenders with indirect coils though.
In article , Uno- Hoo! writes
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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