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. A four-bedroomed house in Berkhamsted had new Jaga radiators fitted when the Ecodan system was installed in the Autumn of 2010. …