What is a Combination (Combi) Boiler ?


Accounting for over half of new boiler installations high efficiency condensing combi boilers are a great space saving solution to that of a regular or system boiler.

Combi's work by heating hot water on demand which removes the need for a hot water tank in the airing cupboard, this provides good efficiency in smaller properties as the water is only heated as and when required.

A conventional boiler will require a cold water tank in the loft, combi boilers take their feed direct from the mains supply which saves yet more space, no hot or cold water tank, as a result of this less pipework is required which generally results in lower installation costs.

A combi boiler also handles the central heating system, hence the name, Combination boiler.

 When Should a Combi be Used ?

 It's important to seek professional advice on which boiler is best suited to your requirements.

In general a Combi boiler is a good choice if you live in a flat or wish to convert your loft into a living area.

If you have more than a couple of bathrooms or mains water pressure is low then a regular/conventional boiler is probably more suited, but remember, get professional advice.

 Pros and Cons of a Combi


 No tank or cylinder required

Minimal pipe work

Quick and easy installation

Mains pressure domestic hot water

Ideal for showers

Ideal for flats


 Not good for multi bathroom properties

Require good water pressure

No airing cupboard or backup electric hot water heating (Immersion)

 Are They Any Good ?

 As you can see in the table above the benefits far outweigh the disadvantages and will continue to do as long as the combi boiler continues to perform to a high level, at a reasonable cost.

This is the reason it's installed in over 50% of domestic households. It doesn't suit every household and if you do have space for tanks then a regular/conventional boiler may be more appropriate.


Aberdeen Boiler Renewals


Aberdeen Heating Renewals




MacDonald Plumbing & Heating

Telephone 01224 647007

 Mobile 07854 470042

37 Rosebery Street




AB15 5LN

"A Boiler For Every Budget"