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Direct Vented Water Cylinders

Inside a direct vented water cylinder there is an immersion heater element which is used to heat up the water. Vented water heaters are gravity-fed from your cold water cistern tank which is usually stored in the loft of a property. The operating pressure of your shower, bath and taps all depends on the vertical distance. To equalise any excess pressure in the system, these water heaters have a vent pipe at the top of the cylinder which goes back to the cold water tank.