What is the difference between a combi boiler and a condensing boiler?

Before getting onto the point of difference between the combi boilers and the condensing boilers, let us get a clear vision to their terms.

What are Combi Boilers?

Combination boiler or combi boilers come being one of the most common types of boilers used in UK for a reason. Unlike the system and conventional units, the combination boilers are designed to be an all in one unit which produces hot water for taps and central heating in order to cut down the use of storage tanks or cylinders, thus occupying the least space required to house the boiler. Additionally on a comparison, the installations are much easier and faster than any other boiler unit.

The combi boilers operates by using the water from the main supply that results in stronger water pressure and ensures that you would never be lacking on hot water again. The modern highly efficient units come, being a stainless steel condensing boiler with an inbuilt heat exchanger that operates in order to serve the customers with hot water immediately.

There are two main reasons behind the combi boilers great and powerful efficiency i.e. these units have high operating efficiency and low internal water volume. This means when in summer days you don’t need space heating you are only paying to heat water which is domestically required.

What are Condensing Boilers?

The gases that are produced from the operation of a normal boiler carry heat that gets lost as soon as these gases are emitted out into the atmosphere. This means that your home isn’t benefiting from some of the heat being generated by your boiler. To combat these, the condensing boilers are designed with two inbuilt heat exchangers in order to ensure more efficient performance of your system with less heat being lost. The condensing boiler thus doesn’t needs to work hard which eventually results into the use of less energy. On a comparison with the non-condensing units, the condensing boilers are made to use less fuel and power while producing fewer CO2 emissions.  

How can a Combi boiler also be condensing?

A boiler at general, whether it be a combi, system or regular unit, operates not only to produce heat but also to produce waste flue gases which are dispersed out into the atmosphere via a flue. In order to combat this when a flue gas heat recovery system is installed inside a boiler, it becomes a condensing unit.

Therefore, a boiler system that operates by using water directly from the mains and comes being compact is a combi boiler which eventually turns into a condensing unit as soon as a flue gas heat recovery system is installed in it, thus making it a condensing combi boiler.

A condensing combi boiler can serve you with a no. of benefits-

  1. Lower energy bills
  2. Reduced carbon footprint
  3. Hot water on demand
  4. More space around the home
  5. Easy to install

A condensing combi boiler comes with the ability to achieve an efficiency mark 90% which makes them highly efficient.

Some best condensing boilers

  • Viessmann Vitodens 200-W
  • ATAG iC Economiser Plus 35
  • Vaillant ecoTEC exclusive with Green iQ combi
  • Worcester Bosch Greenstar CDi Classic

Therefore a condensing boiler operates more efficiently in homes with low system temperature and is easy to install and use. Condensing boiler has always been the ideal choice for the users as it allows them to reuse the heat and minimizes the energy bills as well.

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