Combination boilers or Combi boilers for short are probably the most cost-effective domestic boiler for most types of homes. They control both hot water and central heating. They will allow hot water to be produced before heating the radiators. Their energy efficiency makes them the unit of choice for environmentally-conscious homeowners. Heating water directly from the mains and whenever a tap is turned on, you can get unlimited hot water whenever you need it. There’s no need for a cylinder or water tank, saving you space in your home. Remember hot water has to be stored at above 60 degrees to make sure there is no risk of Legionella, so you’re not paying to heat water 24/7. Combi boilers are also quicker to install than a whole system. Some of the bigger Combi boilers can also be zoned off and run underfloor heating as well as radiators if you wanted to.
Combi boilers’ efficiency ratings generally rank them as one of the highest types of A rated boilers on the market. Helping you to substantially reduce your heating bills and save space. Many people have a combi conversion – this is when a system or heat only boiler is removed along with the tanks. In older properties the airing cupboard can be converted to a shower and make the bathroom bigger. By removing the tanks out of the loft, you reduce risk of flooding and possibly give you the space you need for a loft conversion! – these are some of the reasons the Combi boiler is the best-selling boiler in the UK.
Combi boilers, the advantages:
- Instant response to tap usage and temperature
- Minimal waiting time for hot water and central heating
- Modern combis are perfect for homes with less space
- Some combis can fit exactly in to a kitchen cupboard
- Can run of smart controls
- Water delivered directly from the mains pressure at mains pressure
- Provide powerful showers without the need for a pump
- Easier to maintain since there’s generally less pipework to be installed
- Much lower risk of pipework freezing
- All parts are in the boiler so easier to diagnose faults
- No need for loft space, unless you want to put the boiler in the loft to free space up.
- Most energy efficient way of heating water
- If there’s just the two of you in the home it’s very cheap to run.
Combi Boilers, the down side.
- Not be the best choice for homes with low water pressure issues
- Not possible to run two baths or showers at the same time
- Leaks can cause loss of water pressure resulting in the boiler failing
- Not ideal for larger homes – any home bigger than 4 bedrooms needs careful consideration
- May not be compatible with your shower
- Require a good level of mains pressure
- Gas supply needs to be no less the 22mm to get the right pressure, can add a few hundred pounds to the installation cost.
- If a combi fails you lose everything, no hot water back up
- Whilst you can put a pump on a Combi to boost pressure it’s very expensive and only has a small pressure improvement.