Heating accounts for about 60 per cent of what you spend in a year on energy bills – so an efficient boiler makes a big difference.
Modern boilers are more efficient for several reasons but their main advantage is that they are all condensing boilers. All well-maintained boilers burn their fuel very efficiently but they inevitably lose some heat in the hot gases that escape up the flue. A condensing boiler has a larger heat exchanger so it recovers more heat, sends cooler gases up the flue and is more efficient.
Sometimes the flue gases get so cool that the water vapour in the gas condenses out – hence the name – and even more energy is recovered from the condensing vapour.
What should I consider when replacing my boiler?
If it is time to change your boiler, you need to decide what type of boiler is right for you. Here are some things to consider:
Fuel type – If you have mains gas, a gas boiler is likely to be the cheapest heating option. Fuel prices as of May 2017 suggest that oil heating is currently a cheaper option; however, historically oil heating has been more expensive.
If you don’t have a gas supply to your premises, it might be worth considering a form of low carbon heating such as a heat pump or biomass. With the renewable heat incentive, these may be a cheaper overall. Alternatively, you may want to get a gas connection to your premises. The company that owns and operates the gas network in your area may be able to help with the cost of getting a new connection – and it may even be fully funded.
Boiler type – Most old gas and oil boilers are regular boilers that have a separate hot water cylinder to store hot water rather than providing it directly from the boiler. When you replace your boiler, you can buy a new regular boiler – and keep your hot water cylinder – or buy a combi boiler that doesn’t need a cylinder. A regular boiler is more efficient than a combi at producing hot water in the first place, but then some heat is lost from the hot water cylinder, so a combi may be more efficient overall.
Space at your premises – Combi boilers don’t need hot water cylinders and so require less space.
Compatibility with solar water heating – If you’re thinking of installing solar water heating, it’s worth noting that many combi boilers are not compatible with this heating system or cannot use it so effectively.
Finding an installer – For a list of registered installers visit the Competent Persons Register, SNIPEF OF HHIC. For gas and LPG boilers, the installer must be Gas Safe registered. For oil boilers, an OFTEC registered installer is recommended. It’s worth getting three quotes from different installers. Your registered installer will ensure that your system complies with current building regulations and will make sure you get all the documentation to prove this. Keep these documents safe; you will need them when you sell the property.
Source: Energy Saving Trust