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A back Boiler should have a lined flue and in my experience, I haven't come across that many with spillage problems to be honest.
I personally doubt the spillage test has been done correctly. I cannot think of a BBU where you test for spillage through the fire front.
I recommend you get an Engineer who is experienced in service and repairs of BBU's.
I personally doubt the spillage test has been done correctly. I cannot think of a BBU where you test for spillage through the fire front.
I recommend you get an Engineer who is experienced in service and repairs of BBU's.