There are three main types of boiler: combi boiler, heat only boiler and system boiler. We help you identify which one you have and consider the advantages and disadvantages of each. You may be thinking about a new boiler. This guide can help you decide whether to stick with your existing boiler type or install a different boiler type. How else can we help? Research many more topics at our Information Hub. Do you need help sizing your boiler? Use our easy guide to work it out: What size boiler do I need?. Are you thinking about moving your boiler or changing boiler type, try our other helpful guide: When to swap, move or change your boiler.
Boiler Types Explained | Combi, Heat Only & System
Summary of Boiler Types
What is a combi boiler?
A combi boiler is a single unit that generates all the heating and hot water for the home. There are no hot water tanks. How much is a combi boiler? Read our guide to Combi Boiler Prices
What is a system boiler?
A system boiler has all the same components as a combi boiler without the hot water production. It works with a steel hot water cylinder. How much is a system boiler? Read our guide to: System Boiler Prices
Advantages of a Combi boiler
- Creates space when removing old hot water tanks
- Lower maintenance costs - the integral heating and hot water functions are covered by the boiler manufacturer's warranty/guarantee
- No long wait times for hot water
Disadvantages of a combi boiler
- They do not work well in properties with poor flow rates and/or poor incoming water pressure
- Hot water flow rates are reduced when providing hot water to two or more outlets simultaneously, although this is really only a problem in houses with two or more showers.