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Direct Unvented Cylinders

Direct - The water in a direct cylinder is heated ‘directly’ by the cylinder itself. Other appliances, such as boilers or solar panels are not used to generate the hot water within the cylinder. Instead an immersion heater within the cylinder itself is used to heat the water.

Some cylinders have more than one immersion heater installed within them to allow a more powerful performance, producing more hot water quickly.

Direct cylinders come as either vented or unvented models (this impacts on how the water is distributed across the property to the hot water outlets such as showers & taps) and they tend to be used when a traditional central heating system is not available.


Unvented - If you need a cylinder that uses the mains water pressure to distribute the hot water around your property for use at your hot water outlets (i.e. taps, showers) then you will need to invest in an unvented hot water cylinder.

Unvented cylinders are commonly used as part of a system boiler installation as this enables you to take advantage of the high pressure water supply. If you have limited space in your loft then you will also be pleased to hear that unvented cylinders take up less space than vented cylinders as no feeder tank is required.

At Direct Heating Supplies we have a range of Unvented Direct Hot Water Cylinders available at fantastic low prices.

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