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Open Vented Heating System
Pressurised Heating System
Open Vented Hot Water System
Pressurised Hot Water System
Heat Only Boiler
A Heat Only boiler heats water for the central heating system and hot water cylinder. It is the simplest of the boilers as there are fewer pipework connections to be made and fewer components to go wrong.
Hot water from the boiler flows through either the radiator circuit or through a coil in the hot water cylinder to heat your hot water, or both. (Note, the water heated by the boiler does not itself go into the hot water cylinder and out of the taps, it just heats up the cold water in the cylinder).
Like the Heat Only boiler, this heats water for the central heating system and hot water cylinder. The difference however is that it is used for a pressurised heating system and contains a number of system parts that would otherwise be external to a Heat Only boiler, for example the pump, expansion vessel and pressure relief valve.
Where major changes are being made to a system it is often cheaper and easier to install a system boiler rather than the separate component parts however it also means that when components fail, they must be replaced by the correct parts from the manufacturer and not generic items.
As you can imagine there will be Pros and Cons of any change to the system which will need discussing fully before you make a decision. Some of the key decision Pros and Cons are shown below:
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