Worcester-Bosch Boilers

How do I decide which type of condensing boiler best suits my needs?

There are 3 different types of high-efficiency condensing boiler:

• Combi
• Regular (a regular boiler is often also referred to as a “traditional” or “conventional” boiler.)
• System

Each type delivers all the benefits of high-efficiency technology, but which one you choose will depend on several factors, including your property, your lifestyle and the professional advice of your CORGI (gas) or OFTEC (oil) registered installer.

What is a regular boiler?

To the left is an example of a central heating and hot water system layout using a regular boiler.

If you are replacing an older model of boiler, the chances are that you will have a regular (conventional) boiler. A typical conventional system incorporates a boiler and extended controls, a feed and expansion cistern, and a hot water cylinder (usually in the airing cupboard) which is often fed by a cold water storage cistern located in the loft.

*a thermostatically-controlled shower safeguards against sudden changes in water temperature.

Here are a few examples and guidelines to think about and help you identify the type of condensing boiler most likely suited to your needs.

Consideration	Most suitable boiler
You want to use your loft space for a room conversion or other purpose	COMBI
You live in a flat or bungalow (i.e. have very little or no roof space)	COMBI
Your home has more than 2 bathrooms	REGULAR OR SYSTEM
Your main water pressure is low	REGULAR OR SYSTEM
You want to replace an old boiler to improve an existing conventional central heating system	REGULAR, SYSTEM or COMBI
There is a need to have hot water available on tap without waiting for it to heat up.	COMBI