Modern radiators are more effective, efficient and economical and constant developments in manufacturing technology mean that there is now a greater range of designs than ever before. If you're looking for a simple way of saving money on your energy bills, replacing old radiators is one of the surest ways. If you're asking “how often should radiators be replaced?”, there's no easy answer but a general guideline is anywhere between fifteen and twenty years. If your radiators are nearing this age range, it's worth being conscious of how they're performing.