CH system (circa 1955 and originally gravity fed) has 1" steel pipework feeding into larger diameter steel pipes in sand filled trenches under concrete floor before returning to Vaillant EcoMax 835 boiler.
The system has a slow leak which went undetected during boiler installation in 2005. I estimate the leak to be roughly 500ml/hour and it hasn't changed materially since installation. There is no surface evidence of this leak and it would be unthinkable to start digging up the floors to find and repair it so I'm looking for some other solution.
It was once suggested to me that radweld might fix it, and it might, but I've no experience of it, and do wonder whether it might affect the Vaillant's heat exchanger in any way.
Any thoughts on this, or other possible fixes?
The system has a slow leak which went undetected during boiler installation in 2005. I estimate the leak to be roughly 500ml/hour and it hasn't changed materially since installation. There is no surface evidence of this leak and it would be unthinkable to start digging up the floors to find and repair it so I'm looking for some other solution.
It was once suggested to me that radweld might fix it, and it might, but I've no experience of it, and do wonder whether it might affect the Vaillant's heat exchanger in any way.
Any thoughts on this, or other possible fixes?