I have gas central heating served by a valiant boiler.

[Tina]

When I'm in bed at night I hear what sounds like a tank being filled every 30 minutes or so when I checked my water meter water is being used throughout the night ...any ideas what this is

 

[kozak1968]

Do you have a water softener?

 

[plumber0808]

You have a leak somewhere. Maybe a overflow running?

 

[Tina]

Don't know ???

 

[Tina]

I,ve looked for leaks and running water but can't find any my bedroom is above my bathroom so the noise seems to come from below

 

[Dotty]

Does water continually run down the inside of your toilet pan?

 

[Tina]

No I have a bath sink and separate shower in there nothing seems wrong in there

 

[plumber0808]

Possible leak under floor?

 

[Tina]

As i only seems to hear this happen at night when I'm in bed and the heating is off could it be anything to do with the outlet pipe that goes from the boiler to the drain ?

 

[michael c]

It is possible but unlikely, this would also happen during the day. I would expect a leak but what throws me is the fact you say it fills every half hour or so, this if the sound is beneath you suggests the toilet as it would need to be a ball valve filling.