after it`s cleaned up it doesn`t appear again during the evening, i am washing up and using the hotwater continuosly. It must come during the day while we are away. The hot water system is set to heat twice a day.
Sounds like it may be condensation.
It depends on where you notice leak Do you see it around perimeter of boiler? or directly under..It could be a leaky or cracked boiler or a relief valve leaking. When boiler heats up it expands so if it is a cast iron boiler it may be cracked and leaking when it heats up..Or .like I mentioned it could be the relief valve..Hope that helps you
