There will be a data tag on the boiler(usually with the manufacturers name and model) and this will list the boilers MAWP. If the tag is illegible or missing, there will also be a stamped marking on the actual pressure vessel itself with its unique identifier and MAWP. If the
Despite the fact that you may not have heard of an expansion vessel before, its a crucial part of your heating system that allows it to maintain a constant pressure. If you have a closed-water heating system in your home, such as a combi boiler, you will have an expansion vessel. Put simply, it acts as a kind of shock absorber, handling the expansion and contraction of water in your central heating system as it
What to do if your boiler pressure is too high | Viessmann
Boiler pressure is controlled by the expansion vessel, the balance of air versus water in your central heating system. Too little air in your expansion vessel and the pressure may become too high. resulting in the water coming out of your pressure relief valve.
The boiler plays a significant role in its energy cost. Many times it can burn in excess of 4 times its initial cost in fuel annually. When looking at ways to greatly mitigate this cost, there are a number of areas one can look at for relief. Lets evaluate those priorities
A pressure vessel is a container designed to hold gases or liquids at a pressure substantially different from the ambient pressure.. Construction methods and materials may be chosen to suit the application, and will depend on the size of the vessel, the contents, working pressure, mass constraints, and the number of items required.
The vessel is kept under pressure from the incoming water supply and heated either by immersion heaters (a direct model) or by a heat source located outside the vessel such as a boiler or a wet solar system (an indirect model). The 'vessel' to which we refer normally takes the shape of a cylinder.
How to recharge expansion vessel on combi boiler - Boiler Work