According to heat pump manufacturer Grundfos, the Grundfos Alpha2 is the most advanced energy efficient domestic circulator currently on the market. The Commission of European Communities EuP Directive states that from 2013 only A-rated glandless standalone circulators can be installed. The company says that its Grundfos A-rated Alpha2 circulator pumps use far less energy than typical (D-rated) pumps. With more …