The CE mark, or formerly EC mark, is a mandatory conformity marking for certain products sold within the European Economic Area (EEA) since 1985. The CE marking is also found on products sold outside the EEA that are manufactured in, or designed to be sold in, the EEA.
Condensing boilers are water heaters fueled by gas or oil. They achieve high efficiency (typically greater than 90% on the higher heating value) by condensing water vapour in the exhaust gases and so recovering its latent heat of vaporisation, which would otherwise have been wasted.
Simply put, coal-fired electricity generation is a five-step process: 1  Thermal coal (either black or brown) that has been pulverised to a fine powder is burned. 2  The resulting heat is used to turn water into steam.  The steam at very high pressure is then used to spin a turbine, connected to an electrical generator.