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Condensing boilers vs non-condensing boilers

Since 2005, the Building Regulations state that all newly installed domestic boilers should be high efficiency condensing boilers.  Exceptions apply in very rare cases where it is not feasible to install a condensing boiler.

  • Non-condensing boilers typically take in the air needed for combustion from inside the room; condensing boilers are fully room sealed and take air in directly from the outside through the flue
  • Condensing boilers are typically at least 25% more efficient than non-condensing boilers, which means that you get more useable heat from the fuel you burn; condensing boilers are around 90% efficient so you will save money on fuel bills - up to £310 a year, according to the Energy Saving Trust
  • You could be eligible for a grant to help with the cost of installing a new condensing boiler, or even be able to have it installed free of charge under the title="The Green Deal">Energy Companies Obligation (ECO)
  • If you update your heating controls at the same time as replacing your boiler, you could save even more money on your annual fuel bills
  • A new condensing boiler also has lower carbon emissions - you could be saving 1,200kg of carbon a year and reducing your carbon footprint substantially
  • Condensing boilers require an extra pipe to drain away the condensate liquid.  The manufacturers' installation instructions require that the installer fits this pipe internally into a waste pipe. In some cases, however, the condensate pipe may be fitted externally, and if it is not lagged or protected, it can freeze up in very cold weather, causing the boiler to shut down for protection. We have created a video to help you get your boiler restarted, if this should happen to you

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