The #1 brand in high-efficiency condensing tankless water heaters , combination boilers and wall-mounted boilers. Official ENERGY S TAR® Partner. Navien products are available in the U.S. and Canad a through a select network of wholesale distributors. We are ready to upload more than 61 GB of essential corporate doc uments such as: contact numbers and e-mail addresses of employees and customers, financial data (audits, payment details, reports) , NDA’s, etc.