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.
Oil fired boilers have an oil pump which delivers oil at high pressure to an atomizing nozzle which sprays into the fire chamber. The fuel is ignited with a pilot light or electric ignitor, in the case of a gas fired unit, or a high voltage spark created by a transformer on oil fired units.