Depending on the type of heating and hot water system you have this could be a few things. All are easy to diagnose and range from a few pounds to a few hundred pounds. Follow the easy steps and we’ll find the problem.
1. Look where the overflowing pipe comes out of your house. Is it from the eaves of the roof, near a bathroom / toilet or near a boiler/hot water cylinder.
2.Look at the type of pipe the water is coming from what is the material is it metal of plastic.
Metal pipe near a boiler or hot water tank leaking – This is one of the safety valves opening on the central heating system/unvented cylinder. The valve opens to release excess pressure from the system.