Jährliche Serviceuntersuchung der Brennwertkessel | Thermona - YouTube
VIESSMANN 7855664 Wärmetauscher bei Meinhausshop kaufen
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