When boilers reach a certain age, they begin to experience issues, and you may end up constantly caught between repairing or replacing them. However, that isn't to suggest that newer boilers will not give you issues at some point. While, in most cases, it appears cheaper to continue repairing a faulty boiler, these repair costs could pile up over time. Also, the energy price rise means that repairing and using old model boilers will continue to increase your energy bills.