The primary differences in vented and sealed systems
The primary differences in vented and sealed systems
Before you buy a central heating system you need to establish what type of system and heating boiler you will want. To help you understand the choices available we will outline the primary forms of system. Most if not all of these Central Heating System comprise of a heating boiler, radiator and pipework.
Due to the mean temperature that is experienced across the UK, Europe and in some parts of Russia, individuals barely find the need for air conditioning. The majority of new houses that are being built in this day and age are built with a Central Heating System.
Having become used to modern comforts we cannot do without a heating system. You can relax at dwelling house when the heating is running. In addition to heating the home the central heating system will be used to supply hot water when called for. As heating and hot water are essentials your system needs to be reliable. You want to fit the central heating system to your home requirements so that it both meets your needs and uses gas efficiently.
Whilst there are multiple forms the two main types of system are vented and sealed systems.
The most frequent type of system is the pumped/vented system. A pumped/vented Central Heating System has a hot water cylinder and a feed and expansion tank. In addition to allowing for water expansion when heated the expansion tank also tops up the central heating system with water when necessary. The tank is positioned in the highest place in the home, normally the attic area.
As thinking develops sealed systems are now more normally being installed in homes. There is no need for the water expansion tank if you prefer to have a sealed central heating system installed. The water for a sealed Central Heating System is rendered direct from the main water supply. It feeds directly from the primary water supply. This removes the requirement for any piping or central heating water tanks in the loft, seaing the system and removing the need to vent the hot water has some advantages:
- as the pipe work is removed from the attic it will not be at risk of freezing in the winter
- no maintenance work on the tank or pipe work that would be in the attic in a pumped/vented system
- less hazard of pipe work developing leaks
- reduced risk of airlocks, corroding and sludge as there isn’t a chance of air being drawn down into the system through open vents as the system is sealed
It is usual for the water supply pressure to change and that this is dealt with by integrating a pressure vessel. Valves allow cold water to enter and top up the system when pressure falls, other safety mechanics open valves if the internal pressure is to high.