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

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 Boiler

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:

 

 

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