Why is my boiler making a strange noise?
2 days agou2002·u2002If your boiler is making hissing noises; then your boiler is probably kettling. This can cause the boiler to overheat. There are many reasons for kettling, one is an increase in limescale inside the tank. Limescale can result from having water with excess calcium and magnesium in it that can build up over time.Get Price