I would like to take this opportunity to say I am over the moon with our new boiler. It knocks a thousands spots of the one that has been replaced. Within half an hour of the new boiler being commissioned and switched on we had a very toasty home. The efficiency of the Worcester Bosch Greenstar 30i is second. It was professionally installed by your engineers, who where courteous all the time. I love the new nest to control the heating system too. The mere fact that I can turn the heating on before I arrive home is brilliant. Thank you. You will be recommended to others. Craig Loftus