I Had a insurance Home Emergency call out person out 2 hours ago due to my boiler leaking. His diagnosis was that I need a new heat exchanger or boiler but his office would get back to me with a price. The company only gives £500 labour and £100 parts insurance so I want to check if what they are telling me is right. Basically I can see there is a leak in the seal between the heat exchanger and the sump. Does this warrant a new heat enchanger or boiler. Advice please as its close to xmas. Many Thanks