Q My Ideal Mexico boiler is now 12 years old and at some stage will have to be replaced. Is it possible to replace it with something similar, or am I obliged to put in a condensing or combi boiler? I ...

A The problem of copper pipes leaking when buried in concrete slabs or cement-based floor screeds is a thorny issue. It first gained publicity in the early Eighties, when "research" allegedly found ...