A live trial of an Ecodan air source heat pump in Hertfordshire has demonstrated that Mitsubishi’s system was still achieving over 300% efficiency levels (a COP of 3.0 – Coefficient of Performance) throughout the sub-zero temperatures of December 2010. <br> <br> A four-bedroomed house in Berkhamsted had new Jaga radiators fitted when the Ecodan system was installed in the Autumn of 2010. <br> <br> And during December, the family of four enjoyed an average indoor temperature of around 20 degrees C. <br> <br> An important element in the success of this system was the choice of Jaga’s Strada DBE radiators, with their Dynamic Boost Effect allowing the home owner to increase a room’s temperature quickly if necessary. <br> <br> The 8.5kW Ecodan unit which was installed in the alleyway of the house, has been monitored over the last six months and provides all the heating and hot water that the family required.<br> <br>