In article 64bd3d97-eb36-4dd5-baf8-8ed05fe92208
@googlegroups.com, says...


Leak on heat exchanger of boiler itself.
They can leak only when it's firing/hot.
Water evaporates so not necessarily any drips.


Fill plastic bags with cold water - possibly place in the
freezer for a while to ensure they are really cold - and
hang/place them anywhere that the water vapour might escape
and watch for tell-tale condensation


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Terry

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