When we light the fire in our house after a while a loud banging noise can be heard from the pipes upstairs. The fire has a back boiler attached to it to heat the hot water but it has no pump. The banging can be so loud that I am concerned that the pipes will be damaged and eventually leak. The banging will happen regardless of whether our oil fired boiler is running or not.
Any advice on what is causing this (and how to cure it) would be greatly appreciated.