Which boiler to choose?
There are four main factors to consider when choosing a boiler. This page aims to set out the pros and cons of each. Click on the links below.
- Condensing boilers vs conventional boilers. Condensing boilers are more energy efficient: about 90% efficient rather than 70-80% efficient for a conventional boiler. The savings are made by condensing the water vapour in the exhaust gases
- vs 'wall hung' boilers. Wall hung boilers need a hot water tank, wheras combination boilers make hot water as necessary
- Boiler size depends on a variety of factors such as building size, usage pattern, and number of windows, and is best judged by a qualified engineer
- Fuel - gas is the most common fuel, but in certain areas LPG or oil are more convenient
In addition, a term we use elsewhere on the site is 'system' boilers. These are like normal boilers, but they have system components (such as the pump, the motorised valves, and a pressure vessel) inside. Your installer may decide that a system boiler suits your particular house.
Call us with any queries
Condensing boilers
| Pro |
Con |
- No additional cost - EnergySmart discounts make condensing boilers a competitive or cheaper option than conventional boilers
- Operate at higher efficiency than conventional boilers ~90% efficient rather than 70-80% - saves on your bills, and helps the environment
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- The boiler needs a drain to cllect the condensed water
- When in condensing mode the boiler sometimes produces a plume of water vapour round the flue. This is harmless, but must be sited so that it doesn't cause annoyance to neighbours
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Combination boilers
Non combination boilers are known as 'wall hung' (or occasionally 'floor mounted') boilers.
| Pro |
Con |
- Suitable for flats and smaller houses where there is limited space for a hot water tank
- Hot water delivered at mains pressure, on demand
- Often costs less to install (as no tank is necessary)
- No bulky hot water tank is necessary
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- The delivery of hot water is slightly slower
- Flow rate is diminished if two taps are running at the same time
- there is no opportunity to install a backup electric immersion heater
- More expensive if you already have a hot water tank
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