Most people experience blockage or problems in the expansion tanks of their boilers but the good thing is that the first thing they do, is that they call Potterton Boiler Repairs London. But to understand these expansion tanks you must know that there are mainly two these tanks when it comes to the boiler that works with hot water. The old style of these includes a large tank which is horizontal and is made out of steel. The new style includes a tank with a relatively smaller and more efficient diaphragm. In the older systems of these boilers, the expansion tank which is made out of steal, may be placed in your building’s attic or is located between the basements. While the diaphragm of the new expansion tank systems, is supposedly attached to the pipes of the boiler. You must properly charge the expansion tank with the help of air so that the entrance of water can be avoided. This saves your boiler exceeding the boiling pressure of your desire. Some other possibilities for your boiler to leak are:Fault in the circulation of the pumpThe valve which relieves the pressure could be damagedLeaks at the connection of the water pipeMost of these detail repairs require a trained technician ideally from Potterton Boiler Repairs London. They will perform some difficult but reliable repairs like if the circulator has a fault, then they will possibly replace the seal of the pump. If the valve has been damaged and the expansion tank has been filled with leaking water, they would possibly turn the boiler off so that it can cool down and then inspect the issue. Many small but effective repairs like these can save your house from getting freeze up and renew the boiler that you have.