WarmTech Solutions

One of the biggest pros of condensing boilers over non-condensing options is the fact that they are much more energy efficient. 

'Condensing boilers are undoubtedly better for the environment, recycling waste gas that would have otherwise been emitted into the atmosphere, Non-condensing units have wastefully contributed to CO2 emissions.'

'They require less fuel to generate the same amount of heat  and produce fewer carbon emissions,

This is why, as of 2005, the UK government announced that condensing boilers would become mandatory if you are getting a new or replacement boiler. As such, the rate of condensing boilers has soared over the last two decades; according to a government housing survey, in 2001, just 2% of homes had condensing boilers - in 2020, it was estimated that 74% had them.

It’s reported that condensing boilers are at least 25% more efficient than non-condensing, given that they turn much more of their fuel into usable heat. 'The newer condensing models can reach over 90% efficiency,' notes Nick Tandy, Head Engineer at Toasti. 'However, non-condensing boilers generally reach an efficiency of between 70% and 80%.'

When it comes to costs, non-condensing boilers have traditionally been much cheaper to install, fix and maintain. However, because condensing boilers are actually more energy efficient, you’ll likely end up saving more money on your heating bills in the long-term - even though they are more complex (read: pricier) to repair and install. 

'Heating accounts for about 55% of your annual energy bills, so an efficient boiler makes a big impact,' says Joanna. 'If you replace an old G-rated boiler with a modern A-rated boiler with a full set of heating controls, you could save a fair amount.' The Energy Saving Trust estimates that if you switch from a non-condensing boiler to a condensing model, you could save up to £305 per year, which is pretty significant!