Below are some terminology and parts of a typical central heating system:Water Circulation:The water in some systems is pumped via a circulating pump. The cylinder uses gravity to circulate its water down to the radiators and boilers can circulate hot water to a cylinder to heat its contents via a heat exchanger.Corrosion:A very black and sludge type mass can form and lie at the bottom in the bottom of radiators. This will reduce the water flow around the system and also reduce their efficiency. This can cause rust to form in the radiators. There are chemical additives and inhibitors for sale that clean and protect a system once it is refilled. A Plumber can carry out all types of maintenance.Pipes:Most domestic central heating systems these days are fitted with pipework to the radiators that are 15mm in diameter. Only very old one-pipe systems will now have pipework that is larger than this and will be quite rare now. The water is pumped around and diverted by convection to each radiator. Plumbers know all about heating systems.The Boiler:The boiler is the main part of any heating system, so should there be any issues with it, then, you should make sure you have all the details for the boiler and system, if you need to contact the maker, note the model, year, and any code numbers. All the details are usually on a tally plate on the boiler. Remember, the boiler may have been worked on before, for example the casing might be original, but everything else may be a replacement. Combi-Boiler:This style of boiler does not need tanks or pipework up in the loft. It is also really economical as it only heats the up water as it is needed. The kicker is that while a hot tub is very hot, the flow will be slow. Great for small apartments and flats where space is limited. Sealed System:The sealed systems have an expansion cylinder that allows the hot water to expand. This type of system will have a small pressure gauge somewhere on the central heating boiler.

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