The decision between repairing and replacing a boiler financial can be a big one. Sometimes the nature of the boiler repair makes having a new boiler install the only option. It maybe it cannot be repair for safety reason or the parts has become obsolete. On other types of boiler breakdown, if the boiler is old it may not be cost effective repairing the boiler. Another consideration is the efficiency and the size of your gas bill. Finally and most importantly is the safety. Modern boilers have advance a long way in terms of safety, and a new boiler should give you piece of mind.