Home Company Where we are Customer Services Installer Services Installations Products Book online De Pretto Service has been offering assistance and maintenance services for Vaillant boilers in the province of Venice for years. CONTACT US Customer Services We offer a wide range of customer-facing services, from periodic maintenance to deadline reporting services via SMS and EMAIL. All the services 140 years Vaillant 7 years warranty The 7-year warranty allows you to extend the warranty of your Vaillant boiler from two to seven years (2 + 5). For the entire duration of the warranty you will not have to incur any costs for technical assistance to your boiler! Home | Company | Where we are | Customer Services | Installer Services | Installations | Products De Pretto srl unipersonale Spinea (Venice) Via V. Alfieri 88 30038 - Venice Dorsoduro 2353 Fondamenta Barbarigo Venice Business Registry REA VE 339870 Qualification N ° 11545 to run civil heating systems with nominal thermal power higher than 0.232 MW DGR 3452 of 18 / 11/2008 with DDR N ° 29 of 22/01/2009 Since June 2013 the staff and the company have been qualified and certified according to the European directive CE 304/2008 on the use of fluorinated gases (F-GAS).