Hot water cylinder or instantaneous boiler: which suits the demand

The difference between a storage system and an instantaneous one isn't just the purchase price: it changes how the installation responds when several points ask for hot water at the same time.

Cylinder: hot water ready, with a limit

The cylinder heats and stores a fixed volume of water (usually between 50 and 200 litres in a home), available instantly until it runs out; then it needs time to recover temperature. It's a good option when demand is concentrated at specific moments (a morning shower) and there aren't too many simultaneous points of use.

Instantaneous boiler: no litre limit, but limited flow

The instantaneous boiler heats water as it passes through, with no tank, so in theory it never runs out. Its limit isn't litres but flow rate: if several hot water points are opened at once (a shower and a dishwasher, for example), it may not keep up and hold the temperature at all of them.

How to choose by home

For homes of 1–2 people with moderate use, the instantaneous boiler is usually enough and takes up less space. For homes with several bathrooms and frequent simultaneous use, a good-capacity cylinder (or a high-output boiler) avoids the "we ran out of hot water" feeling that clients complain about afterwards.

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