There are three types of boilers, combi, regular, and system.
- While conventional regular boilers are fed a supply of cold water from the large feed and expansion tank in your attic, a combi boiler gets its water supply directly from the mains, delivering a stronger pressure similar to a system boiler.
And, while both system and regular boilers require a hot water cylinder to store hot water, combi boilers produce hot water on demand when you turn on your tap. Combi boilers basically combine a water heater and a central heating boiler in a single compact unit. Combination boilers are available in different types; gas combi boilers, oil combi boilers, LPG combi boilers, and electric boilers. Natural gas combi boilers are the most commonly installed type. If your home is connected to a gas network, it is often the best alternative to keep running costs at a minimum. For homes not connected to a gas network, an oil combi boiler is a popular choice. These HVAC systems require a tanker of oil to be kept outside your building which needs to be topped up by your oil supplier as or when it runs out. Liquefied petroleum gas combines gaseous hydrocarbons produced from gas and oil extraction 66% and oil refining 34%. This setup is the same as oil boilers. For instance, the boiler needs to be supplied with fuel from a tank and refilled when running low. Electric combi boilers are slightly different from the others because it does not burn fuel to heat water, rather, it passes the water over an electric element.