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There are four different types of hot water cylinder, that each work in different ways or have different properties. These four types are:

  • Direct hot water cylinders
  • Indirect hot water cylinders
  • Vented hot water cylinders
  • Unvented hot water cylinders

So what are the differences between these two? And which do you need?

Direct hot water cylinders

Direct hot water cylinders are designed with immersion heaters within the cylinder itself. These heat the water directly, and some even use multiple heaters to keep the water hot, and provide maximum performance.

Indirect hot water cylinders

These are a type of hot water cylinder that require an external source of heat, which is generally the boiler. Indirect hot water cylinders can also sometimes be fitted with an immersion heater as a back up heater or for boost functions.

Vented hot water cylinders

Vented hot water cylinders are those that are connected to a cold water tank, and get their water supply from this instead of the mains water supply.

Unvented hot water cylinders

These are a type of hot water cylinder that are connected directly to the mains water supply. This means you wont need a cold water storage tank. As this is fed by pressure, rather than gravity, you can also install this almost anywhere in your home.

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