Last year my gas plumber got rid of the old fashion immersion tank and replace with a new combi boiler in the attic. It been great as it is out of the way, more efficient and the hot water pressure is perfect. But I notice in winter I get condensation builds up in the attic! I live in a terrace house and do not have underfelt under the roof-slates, therefore the cold slates and a warm boiler builds up condensation during winter!!
I'm thinking of having underfelt putting in by professional roofer. The underfelt is 'breathable' and hopes this will solve the problem (??)
I wonder if anyone had similar experience?