Combi vs Conventional Boilers: What is the difference?
Have you decided it’s time for a new boiler? Great! When it comes to making your boiler choice, there are a number of factors to consider when making the choice about the right boiler for your household.
A combi, or combination boiler, is the most common type of boiler system in the UK. It is a high efficiency water heater and central heating boiler within the same unit.
When you run a the hot tap, the water is directly heated by the mains, so there is no need for a hot or cold water storage tank in your roof space.
So you will never have to wait for the water to heat up when you have a bath – or even worse, have the water running freezing cold halfway through your shower!
Combi Boilers Explained
System Boilers Explained
There are various other options available to suit certain households and families, including conventional boilers, which are slowly declining in popularity. They take up more space and are typically feed from a cold water storage tank situated in the loft and also require a hot water cylinder that is normally located in an airing cupboard. The boiler heats the water in the radiators and outlets in bathrooms or the kitchen.
Sometimes called conventional boilers, regular boilers are suited to older and larger homes. They have two water tanks typically in the loft space: A large cold water storage tank that feeds the hot water cylinder, and a smaller feed and expansion tank that feeds the boiler and heating system. This system provides good flow rates where lots of water is used simultaneously as booster pumps can be fitted to showers.
- Instant unlimited hot water supply
- Highly efficient, when compared to older boiler models
- Frees up space in the property
- Easier to install
- No back up if breaks down
- Slightly more expensive than a regular boiler
- You’re relying on the mains water flow-rate
- You can use several taps at once
- Ideal for larger properties where there are two or more bathrooms
- Suitable with an older heating system
- Immersion as back up
- A good option where water pressure is low because not reliant on mains pressure
- Compatible with solar heating systems for a lower carbon footprint and energy costs
- Poor energy efficiency, especially if the tanks are poorly insulated
- You can only use up as much hot water as there is in the tank
- Most heating components are outside the cylinder so take up more space
- Installation is more expensive
Ask these questions before making a choice about your boiler:
- How many people live in the house and will you be showering at the same time?
- Are you planning a loft conversion or extension in the future.
- Where will you position your boiler?
- Is the mains supply powerful enough
We will ask all of these questions and look over the current system to help you make the right decision.