What is the difference between Vented and Unvented Hot Water Cylinders?

Unvented cylinders work directly from the mains supply of water and are essentially a hot water storage cylinder, whereas vented cylinders are connected, via a vent pipe, to the cold water storage tank which is usually located within the loft space of most properties.  Because unvented cylinders are fed directly from the mains supply of water, the water pressure and flow is much stronger, providing hot water at mains pressure to all outlets within the home. This means you don’t have to rely on a pump to maintain the strength of the flow when using hot water outlets or heating systems and great water pressure is a huge benefit, especially for homes with more than one bathroom.

Choosing a high performance unvented cylinder also eliminates the requirement for a cold water storage tank, meaning valuable space isn’t lost to extra pipe work and fittings. 

Unvented Hot Water Cylinder