Last week I got hit with a colossal water bill. After contacting the supplier I was told to conduct a stop tap test on my water meter. I was confident this would reveal an external leak as we'd seen no sign water is leaking anywhere indoors. However, the test indicate the leak is indeed internal.
The supplier said that we now need to get a plumber in - at our expense - to locate and fix the leak. But I find it hard to understand how on earth anyone can track down a leak when there's no evidence of any water escaping other than the meter showing.
The supplier suggested the likely culprits were toilets or the boiler. I don't really understand how a boiler can leak water without us knowing, so I checked the toilets and couldn't see any water escaping down the overflows. We don't hear water running anywhere although we do have a water softener which I suppose could be involved somehow.
What I'm really dreading is a plumber coming out and racking up a huge bill spending hours failing to find a leak. Is there anything I can do to try and locate this leak myself, and if not, what can a plumber do that I cannot?