This paper begins by summarizing the main mechanisms by which componen
ts in central heating systems can corrode, and indicating the factors
which can increase or decrease the rates of corrosion. The basic princ
iples are then applied to the analysis of three case studies of corros
ion failure in heating systems: rusting through of mild steel radiator
s after only 2 years in service; premature pitting corrosion of alumin
ium heat-exchanger tubes; and external corrosion of mild steel water p
ipes. (C) 1997 Elsevier Science Ltd.