Viessmann is launching a promotion offering installers and developers a Vitodens 242-F solar storage combined boiler and Vitosol solar kit package at a discount of approximately £1,000. The offer will run until November 2012, whilst stocks last. The compact size of the Vitodens 242-F gas-fired condensing boiler makes it an ideal installation for tight spaces, Viessmann says. The boiler comes …