Compliance with strict standards
European Efficiency Directive Only boilers which meet the efficiency requirements defined by this directive and bearing EC markings can be manufactured and marketed. These markings can be accompanied by additional markings in the form of stars. The level of efficiency is denoted by a number of stars (from one to four) which signifies the energy performance of the boilers. These stars are assigned according to the efficiency of boilers at full load, and at 30% load. De Dietrich adheres to this directive, and proposes :
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