What is unvented system?

In an unvented system there is no cold water tank – instead a sealed hot water cylinder is fed directly by the cold water mains. An unvented cylinder will have outlet pipe work connected to it that distributes the heated content of the cylinder (hot water) to multiple outlets around the house.

How does an unvented system work?

An unvented cylinder is connected directly to the mains water supply. It uses electricity or gas to heat water to a pre-set temperature. The act of heating water causes it to expand, which creates pressure within the cylinder. That pressure pushes the water outward throughout your home’s pipes.

What is a unvented?

An unvented hot water cylinder differs in that it provides mains pressure hot water directly from the cold mains as opposed to tank pressure water provided with a vented cylinder. The cold water is directly pulled from the main water supply and is then heated by the selected heat source relevant to the cylinder type.

What is the difference between vented and unvented systems?

The main difference between a vented and unvented water storage cylinder is that an unvented hot water cylinder takes its water supply directly from the mains. You can get hot water out of an unvented cyinder at a much better pressure than a traditional vented cylinder as it is pressurised.

Can I use a vented cylinder in an unvented system?

Yes you can. You just won’t fit the expansion vessel and the inlet control group.

Is an unvented cylinder better than a combi boiler?

Probably the greatest benefit of a system boiler with unvented cylinder, aside from the fantastic water pressure, is the fact that it is incredibly energy efficient. This is because cold water storage tanks simply aren’t needed (much like the storage combi).

Why do unvented cylinders explode?

An uncontrolled/uncontrollable heat source putting heat into a sealed system, without any means of removing the heat or releasing the pressure will eventually result in a bang-type pressure release. Domestic cylinder explosions in the UK have mostly been vented types (frozen, blocked OV, incorrectly installed).

What is unvented system? In an unvented system there is no cold water tank – instead a sealed hot water cylinder is fed directly by the cold water mains. An unvented cylinder will have outlet pipe work connected to it that distributes the heated content of the cylinder (hot water) to multiple outlets around the…