when my boiler is running I get a constant loud knocking noise. Is there any reason as to why this is happening? Thanks
The water has sediment in it (minerals). The sediment has deposited the sediment in layers on the inside of the Water vessel. when the burner turns on the vessel transfers the heat to the sediment which transfers the heat to the water. When you have water between the layers or in Micro cracks of the sediment the water starts to boil. The water then causes pressure (steam) on and between the layers of sediment. The sound you hear is the water expanding like a little firecracker between the layers. This is normal but an indicator that the water heater is aging. The average heater lasts 10-12 years, some as few as 4 depending on the water and usage.
If it's a steam boiler, some of that can be normal. If it's a steam boiler, you should have it checked for proper operation. Those boilers and components cost about 3 times that of a hot water boiler. If it's a hot water boiler, then look at the circulator pump to see if the coupling is rusted or broken. If that's not it, check the water level and pressure. You want 12psi, plus 6psi for each floor above the boiler.
