The CORGI fitter who replaced the boiler was the same person who advised that the leak could have been caused by a pinhole in the heating coil of the indirect tank. I was doubtful at the time because the CH tank water level is at a lower level than that in the HW tank, so a leak should have...
Another point - the boiler is a replacement for an ideal Mexico which had been in service for about 25 years, and was fitted into exiting system which only needed to be modified to accept the different pipe fittings of the newer boiler.
I have removed the sump plate from the heat exchanger and viewed the condenser collector. No water is falling from the heat exchanger at any point I can see, no water drips from the condenser waste pipe when the boiler is not firing. The header tank will still lose about 4 gallons over 24-48...
By filling it manually, I monitor the system, If a valve is fitted, as is normally the case the valve can stick 'up' as it is not used much.
I'll try monitoring the water from the condenser.
Thanks
An ideal Mexico floor standing (replacement) boiler was put in in Sept08. It was fine for about 3 months and then the header tank kept emptying out. It is an open vented tank which I fill manually.
The system will lose about 2-3 gallons of water per day. It was suggested the heating...