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Moreover a glossary are given as follows for a better understanding of technical terms.
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Combination boiler
A combination boiler provides central heating and instant hot water with no need for a storage facility. This is part of a sealed system which means that there is no need for a tank in the loft or water storage cylinder.Condensing boiler
High efficiency boilers or condensing boilers work on the principal of recovering as much as possible of the waste heat that is normally rejected into the atmosphere from the flue of a standard efficiency (non-condensing) boiler. Consequently, condensing boilers are far more energy-efficient.They operate at an efficiency rate of around 90% compared to about 78% for standard efficiency boilers. This delivers excellent savings on fuel bills and reduced levels of pollution. The Government legislation that came into effect in April 2005 has resulted in a dramatic change in the type of boilers that can be fitted in your home.