This sounds like a massive repipe job then - what a shame!
I reckon, for such a volume of water to disappear, the pipe with the burst must be in an air void somewhere, allowing the water to disappear.
So, are you going to repipe on the surface, or start breaking the concrete out? Your main flow and return to / from the boiler terminate in things called 'manifolds', if its microbore - then the flow and return to the rads branch off from there. I guess the leak will be in one of the boiler pipes.
Lets know how you get on.
John
I reckon, for such a volume of water to disappear, the pipe with the burst must be in an air void somewhere, allowing the water to disappear.
So, are you going to repipe on the surface, or start breaking the concrete out? Your main flow and return to / from the boiler terminate in things called 'manifolds', if its microbore - then the flow and return to the rads branch off from there. I guess the leak will be in one of the boiler pipes.
Lets know how you get on.
John