It is often wrongly assumed that old boilers are inefficient: 75% efficiency, 70% efficiency and 60% efficiency. These boilers can have an efficiency of around 95%, while older boilers usually have an efficiency of 60 to 70%. Cast iron boilers, on the other hand, should be considered for replacement if they have been operating for more than 20 or 30 years. Some of these boilers can last up to 50 years or more, but even with decent annual maintenance, their efficiency is much lower than that of current cast iron boilers.
If your boiler is older than 6 years old, it is recommended to replace it with a new, highly efficient boiler. Modern boilers can vary their performance up and down to adapt to changes in temperature, which is very efficient, but only when combined with a control that speaks the same language. These reduce boiler performance depending on outside temperatures and help it operate for longer periods with lower yields, which is much more efficient. A new boiler will also operate at maximum efficiency, meaning it will use less fuel to heat your home, helping to keep heating costs low.
A service makes a boiler more energy efficient The more efficient your boiler is, the less energy it needs to operate and the warmer your home will be. On the other hand, a boiler over 20 years old would be very inefficient& and upgrading to a modern boiler would likely save the higher figure of around 340 pounds a year, but only if configured correctly. There are many changes you can make to greatly improve the efficiency of your current system without changing the boiler. A high-efficiency gas condensing boiler is one of the most economical and cleanest ways to heat your home, reduce your monthly heating bills and reduce environmental impact.
New boilers are more efficient, have long warranties and can often pay for themselves thanks to savings in energy bills. It is difficult to determine the efficiency rating of older boilers because the ratings are applied retrospectively. A condensing boiler recovers more heat from the exhaust gases and uses it to heat central heating water, making it more efficient than older boilers. If a landlord fails to professionally service the boiler at least once every 12 months, they are violating the Landlords and Tenants Act of 1985, which enshrined this obligation in law.
A modern boiler is more efficient and, in fact, could be around 95% more efficient than an existing older boiler.