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Energy bills have been increasing. There are still ways to reduce this.

Boiler Types

Choosing boilers is normally left to the engineer to specify. In a few cases clients do not understand the difference between systems. Once a specific system is installed, it is very difficult to change the system type.Firstly speaking boilers are divided into the following different fuel types:

Gas : Natural Gas (NG), Liquid Petroleum Gas (LPG), Hydrogen gas etc
Oil: Kerosene, Bio Kerosene, etc
Electric: Powered by mains electricity
Solid: Woodchip, pellets, coal, etc.

Then the boilers are further divided into the following types:

Combination Boiler

This due to small property sizes and lack of space has become a very popular choice for modern propeties.

Pros: Space saving heating and hot water in one appliance

Cons: If a critical part goes down, you can lose both heating and hot water. Requires larger gas pipes as the output is increased.

Hybrid Solutions: Combination Boiler with 1 Electric shower for backup purpose

System Boiler

Image: System Boiler – Copyright ©

This is commonly used with a Hot Water cylinder.

Pros: Hot water cylinder can be sized to demand with immersion heater backup.

Cons: Requires more space for the cylinder

Open Vent / Regular Boiler

Image: Regular / Open Vent Boiler – Copyright ©

This is commonly used in older systems with a central heating tank in the loft with possibly a cold water storage tank too.

Pros: Boiler size is small and where there are space constraints allows flexibility.

Cons: Open vent systems are liable for more corrosion than usual.

Combination Boiler with Store

This is a combined combination boiler with a hot water storage tanks.

Pros: Space saving with high hot water flow similar to unvented cylinders

Cons: The appliance can become more complex to fix and obtain system specific parts


How to decide which system is best use the following decision tree:

Disclaimer: Information on this website is provided for informational purpose therefore we cannot accept liability for subsequent problems. All repair tasks should be carried out by qualified trades people. We may also receive commission payments when you are taken to external websites and complete purchases from third party sellers, once you leave our site, we cannot be held liable for your purchases.