Our boiler stopped working a few days ago so we got a few engineers out to price a new one , the first one said to upgrade to a Combi boiler as we have a system that’s about 23 years old and said it would be no bother to set it all up. The second guy we mentioned for pricing a combi just on the basis that it would be better than just getting a like for like system but he said the radiators would not handle it so it would not be possible without putting whole new system in ? Only reason I am now wary is my gran feels she was told something similar several years ago so I thought I should check with a forum.... I will attach a picture but does that sound right? If you need any more info just ask