Simple explanations for plumbing problems

Water coming out of overflow pipe on side of house

Why is water coming out of the overflow pipe?

Overflow pipes are designed to both stop your home flooding and warm you of a problem. 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.

Overflow pipe running

What should I do if water coming out of overflow pipe on side of house?

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.

Plastic pipe from eaves – if water hasn’t been used for a while 

Ball valve has a slight leak that isn’t noticeable when water is being drawn off regularly.

Plastic pipe from near bathroom/toilet 

Water level in toilet cistern is too high.  Could be:

  • If the float valve is passing there will be a constant drip on the valve when you take the lid off the toilet cistern.
  • If the float has split and filled with water it won’t float so won’t close the valve fully
  • If the water level has been set too high the valve will never shut and will constantly overfill.

Plastic pipe near a boiler

Could be the condensate pipe from a modern condensing boiler leaking.

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.

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