Viessmann Vitodens 100-W vs Worcester Bosch Greenstar 34CDi Classic
Bought a house, had a Viessmann Vitdoen 100 (4 years old), previous owner never serviced. Plumber suggest replacing entire unit as Viessmann are not well built/require lots of servicing a year. Please
Why choose a Viessmann replacement gas boiler | Clarity Heating