Typically, the “as new” efficiency of an oil or gas boiler over 15 years old would have been less than 80%. It’s present efficiency today, due to wear and tear is unlikely to be greater than 70%.
The current range of boilers available today will have efficiencies greater than 90%. This represents an operational improvement in efficiency of up to 20 percentage points
Increasing the operational efficiency of your boiler by this amount represents an actual fuel saving of more than 25%. In other words, by replacing an older, low efficiency boiler with a new, high efficiency boiler, you can cut your fuel bills by a quarter.
So, replacing old boilers makes good sense for two reasons:
Significant fuel cost savings, which can only increase as energy prices escalate.
Improved reliability and safety.
If you have a boiler older than 15 years then it is most likely during the next few years that you will have to replace it on reliability grounds in any case. Change it now and start saving immediately!
By planning the change (rather than it being forced on you in the depth of winter when it breaks down) you can get competitive quotations and reduce the cost.