Advantages of a combi boiler
Normally with a combi boiler there is a simple compact unit in the kitchen or utility room or occasionally in an airing cupboard. Space is saved due to the lack of a hot water storage unit, a cold water storage unit and other components that usually make up a normal heating system.
The major advantages of this type of boiler are the monetary savings seen on the cost of hot water, the fact that you get water out of the taps or shower at the same pressure as if it was from the mains and the fact that there are no tanks being placed in the roofing and less pipe work to install. This in turn means installation is faster and not as difficult thus reducing initial costs as well.
As combis are so common Potterton Boiler Repair London costs should be relatively low whilst parts and engineers easy to find.

Disadvantages of a combi boiler
There is only one real disadvantage to these boilers and that is that in order to get hot water on demand you need an adequate supply of cold water. This means that if a large number of taps or showers are using hot water at the same time then the flow to each one is reduced depending on the amount of power your combi boiler has. Consequently, if the mains water supply is not adequate or you have sudden pressure decreases then this type of boiler are not suitable for your situation.
Conclusion
There are a number of advantages to the combi boiler such as hot water on demand and cold water coming from the water main thus eliminating the need for a cold water tank and a hot water cylinder. They are also highly efficient and can often generate significant savings on gas bills. Potterton Boiler Repairs London can give you the right advice about what you require while getting a new boiler or repair the old one.