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In the past leak was above the heater part of boiler at the right angle (with an automatic valve) (lets call it A)that bled to the wall outside: now sadly corroded Are you sure its not coming from above and running down into the bottom part of the boiler? Might be, but when it happened not...

Apologies to all for my lack of clarity javascript:emoticon(':oops:') 1 old (pre 1995) worchester highflow 3.5 boiler 2 high >3bar mains cold water supply 3 pilot light often cuts out if i have the hot water running full for more than 4 minutes 4 recently changed the flexible inpipe...

bit of kettle calling pot black looking for helpful suggestions!

Disaster always had problems with demand valves and overflow leaks in the past. tonight the input pressure went above 4 bar and I couldn't bleed in time Result: leak red water then black water on floor then no hot water at all whilst the pilot light carries on mains water pressure high...