What is the difference between vented and unvented hot water heating systems?

January 24, 2019
A vented hot water system is a traditional approach to water systems where there is a cold water storage tank (installed in the loft) which supplies water to the hot water cylinder via a vent pipe. The system is relatively simple in its construction and installation and operates at lower pressure.
 
This system is the cheaper option of the two, but it may deliver water at a lower pressure which can be a drawback. With the presence of a tank and cylinder for storage, this system may take up more space in the home. However, this system requires almost no maintenance. One of the main advantages of this system is that if for any reason the main supply of water or gas is cut off, you can still have access to limited hot water.
 
An unvented cylinder, on the other hand, is connected directly to the main supply of water and hence does not require a separate cold water tank. This system is a space-saving option. The water pressure here is better as the system is connected directly to the mains. Unvented systems do not have a vent pipe or tank for the excess water as it heats and expands. These systems come with inbuilt safety features such as expansion units at the top or an air bubble that is inserted while installing the system. These also include other safety mechanisms, such as pressure relief valves and twin thermostats. The main advantage of this system is that it improves the performance of your bath and shower. The lack of a separate tank of water helps avoid issues such as freezing during winter or contamination.
 
Able Heating provides heating services in Pulborough, Brighton and Crawley. Browse through the website for more information.