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.
About Boilers. Boilers and furnaces are often confused, but the terms are far from interchangeable. Both are systems that heat your home, but the similarities end there. Boilers heat water, providing either steam or hot water as a method of heat; furnaces heat the air. 1  Steam boilers distribute heat through pipes to steam radiators. 2  Hot water boilers distribute heat through baseboard radiators or radiant flooring systems, or they can send the heat to a coil that heats the air.