What Type Of Boiler Is In Your House?

The majority of boilers encountered in domestic dwellings fall into two main categories

, namely, standard central heating boilers and combination boilers. From each of these two divisions boilers can be subdivided into sealed and vented types. A further classification can then be also applied when looking at how such a device operates. For example is the boiler condensing or non-condensing. Standard central heating boilers are generally induced or forced draught combustion units, which means that they are fan assisted.

System boilers are complex. They contain more than just the boiler itself. Other items that are included within the casing are an expansion vessel, pressure release valve and a pump. These contents are normally suitable for domestic situations as very little customisation is needed. A standardised version suffices in most occasions.

Standard central heating boilers have a pilot ignition system that is either permanent or present only during operation. Pilot ignition systems mostly use a thermocouple device to ensure a flame is present and signal the gas solenoid valve to stay open only when this is the case. Heat produced from the combustion of Natural Gas or LPG is transferred to the heat exchanger, which receives return fluid from the colder side of the central heating pipe-work.

An increase in temperature of typically 12 degrees is caused by the thermal fluid flowing by the heat exchanger. It is possible to purchase heat exchangers that are made out of different material such as aluminium, copper, steel, or cast iron. The combustion products are delivered by the boiler from the combustion chamber to the flue terminal via a flue system.

Nitrogen Oxide, Sulphur Oxide, additional water vapour, carbon monoxide, and particulate matter can all be found as additional substances in the Flue gas. Due to the combustion activity that takes place the oxygen and carbon dioxide concentrations can also be different. The water vapour possesses a large amount of latent heat and this thermal energy will then be lost to the atmosphere.

by: Barry O'Flynn

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