A central heating that is sealed uses a combination of parts to let the system work without a fitted feed and expansion cistern (or header tank). These parts are made up of a filling loop, pressure gauge, expansion relief valve, and expansion vessel. Hampstead Plumbers service and repair these systems on a regular basis.

Sealed System with a Combination Boiler.
The majority of modern combination (or combi) boilers often are made up of a pump, a pressure gauge, an expansion relief valve, a filling loop and an expansion vessel in with the boiler. This actually is a help to the installing engineer, allowing him to create a sealed system when installing a central heating system. Hot water is made instantly so a hot water cylinder does need to be fitted.

To Summarise.
Central heating systems can at first glance seem difficult and complicated to understand. Once you understand the controls and the various system components, along with your system, you will be better able to make more informed decisions about the replacing of system components. This includes maintenance also, which overall will keep your system efficient. A Hampstead Plumber is qualified to work on sealed systems.


A Vented System.
The vented system is another version of the system that feeds our heating. In this type of system there is a header tank fitted at the highest point in that system, which is normally in the loft. This tank is usually quite small in size and probably black. The tank lid will be loose and should be half full of water. Fitted at one side of the tank is a water feed that is controlled by a ball valve arrangement just like the one used in the WC cistern, this keeps the level correct. An overflow is also fitted so it will not overfill. A pipe runs out of the bottom of the tank and connects to the heating system. The sealed system has its uses for instance if you live in a small flat where space is limited, this system without a tank is ideal.”