Unvented water cylinders, do not require a cold water tank and can be installed anywhere in the house. They are called “unvented” because they do not rely on a vent pipe to the outside to regulate pressure. Instead, they are directly connected to the mains water supply, which provides high pressure and a constant flow rate. Unvented cylinders are more expensive than vented ones, but they are more efficient and suitable for larger households with multiple bathrooms and a high hot water demand.

The main advantage of an unvented system is that it provides high water pressure, which means that you can have strong, powerful showers and quick filling baths. Additionally, they are generally more energy efficient than vented systems as they have better insulation and heat loss is reduced.

They come in various sizes to suit different needs and are usually made of stainless steel, which is durable and long-lasting. They have a number of safety features built in, including pressure relief valves and temperature controls, to prevent over-heating or over-pressurisation. It is important to note that unvented systems must be installed by a G3 qualified professional, as there are strict regulations in place to ensure the safety of these systems. Regular maintenance/ annual service is also required to keep the system running smoothly and safely.