SearchAsk us anythingarrow rightHow efficient is a 20 year old boiler?Modern condensing boilers are potentially effective 89-94. Boilers over 20 years of age can only be effective 60.Let's Get It Fixed!Our virtual experts can diagnose your issue (for free!) and resolve simple problems.Chat with a live expertChat nowCall 1 (855) 466-3948Call nowRATESHARECopy linkTwitterLinkedinFacebookmagnifying glassLink copied to clipboard.SUBMIT AN ANSWERShop Recommended ProductsShop HomeX Recommended ProductsRELATED QUESTIONSHow efficient is an old boiler?If your boiler is over six years old (and certainly if you are ten or fifteen years old), it is worth replacing it with a modern condensing boiler. These boilers can have a yield of about 95 while the old boilers are normally effective 6070.How efficient is my old oil boiler?These boilers can have yields of about 95 while the old boilers are generally 6070 efficient. If you get your maintained boiler your energy technician should be able to let you know how effective your boiler is, but you should be able to save by modernizing your boiler if it is about 80 effective.What is a good boiler efficiency?The AFUE rating for a complete electric boiler is between 95 and 100. Non-condensing boilers have efficiency ratings of around 80-88, and condensing boilers have an efficiency of over 88.How efficient is my old boiler?If the boiler is more than six years old (and certainly if it is ten or fifteen), it is worth replacing with a modern condensate boiler. These boilers can have yields of about 95 while the old boilers are generally effective 6070.How efficient are Baxi boilers?Annual gas consumption 15 000kWh (a little lower than the national average) Boiler Baxi Combi Instant 80e D operating at 78.6 efficiency. Boiler new Baxi Aventa Plus 39c Combi A operating at 90.8 efficiency.