Unvented Central Heating System Diagram

The s plan is popular because it is versatile you can add an unlimited number of zones simple to wire and easy to fault find on.

Unvented central heating system diagram.

In an unvented system there is no header tank and the water in the pipes is under pressure. The electric versions use a coiled heating element to heat the water rapidly in a. When the water in a pressurised system expands the pressure in the. The arrangement shown here is most likely for an existing y plan system where the cylinder is being changed to an unvented one.

Instantaneous hot water heating systems this method involves using gas or electricity to heat the water to a useable temperature without the need to store the water. For an entirely new installation s plan would be a far better choice as that does not have the default open problem and also allows the use of multiple zones for the central heating. Modern heating systems run by gas boilers tend to be unvented or pressurised. One givaway is that there is often a pressure gauge on the boiler measured in bar.

S plan heating systems are now the most common type of system installed in the uk after combination boiler systems which do not have any external motorised valves. A guide to the different ways of heating domestic hot water so you can identify problems and faults with the hot water tank or central heating system and carry out any maintenance needed. A guide to the most common types of domestic heating and hot water systems with diagrams including indirect boiler system unvented system thermal store. However our purewell variheat cast iron condensing boiler can be installed in an open heating system.