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What's the difference between a vented and unvented cylinder?

3 Answers

Answered by BoilerOne

29th May 2019

BoilerOne answered the question "What's the difference between a vented and unvented cylinder?"

A vented system would have an open vent into the header tank for expansion, and will provide gravity hot water from the height of the header tank. An unvented cylinder uses mains cold water at a set pressure to provide a balanced and higher pressure to hot and cold outlets. It is important that the pressure and flow are checked prior to installing an unvented cylinder. BoilerOne recommend you consult a heating engineer with an unvented qualification to install your cylinder.

Answered by Fortune And Co Plumbing and Heating Ltd

22nd May 2019

Fortune And Co Plumbing and Heating Ltd answered the question "What's the difference between a vented and unvented cylinder?"

An Unvented cylinder is connected directly to the mains water so there is no need to a cold water tank in the loft. You are essentially cutting out the middleman and the water pressure should be much stronger. Unlike vented cylinders, there is not a vent pipe or tank to cope with excess water as it heats and expands.

Answered by A.D. Energy

17th May 2019

A.D. Energy answered the question "What's the difference between a vented and unvented cylinder?"

A vented system is typically a system that has water tanks feeding the heating and/or hot water cylinder. The tanks in the loft act as expansion for when the system heats up. Vented hot water systems are low pressure. Unvented systems are pressurised and are mains fed. The system has expansion vessels and various safety devices to protect the system. Pressure from these is much better due to being mains fed. You can also usually have multiple hot water outlets open without a reduction in pressure.

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