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 Social Wall all the latest news and curiosities from our official Facebook page Home | Company | Where we are | Customer Services | Installer Services | Implants | Products | Privacy | Cookie Policy 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 303/08 on the use of fluorinated gases (F-GAS).