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Gas-fired boilers installed after 1 April 2005, and oil-fired boilers installed after 1 April 2007, must be condensing boilers, whether they are replacements or new installations.
Condensing boilers are more efficient than ordinary boilers as they:
A typical heating system will last about 25 years, though some boilers can last twice that long. Your heating system technician or energy auditor may be able to help you evaluate your existing system and decide whether replacement is a good idea.
If you know how efficient your existing heating system is (AFUE), it's pretty easy to calculate the savings you will get by replacing it. The chart below will help you determine potential savings resulting from replacement of your existing system. Your heating service technician or energy auditor may be able to help determine the AFUE of your present system. If you were only provided with the combustion efficiency, you can estimate the AFUE by multiplying the combustion efficiency by 0.85. The numbers in the chart assume that both the old and new systems are sized properly; savings will be greater than indicated if the old system is too large.