Vented or unvented hot water tank: what’s the difference?

If you have a hot water tank in your home, it will usually be either vented or unvented.

You might also hear these called hot water cylinders, but most people simply know them as the tank in the airing cupboard.

The difference between the two affects how water gets into the tank, how it reaches your taps and showers, and the kind of water pressure you can expect.