I highly recommend everyone at Copperhead Mechanical. They removed an old boiler and gas hot water heater from our old house in Wanless Park. Adrian, owner of Copperhead, made the Viessman recommendation and set up all the professionals to complete a turnkey job in record time. Parish, Huebsch, Sudev, and the crew worked long hard days to put the project together with the utmost professionalism. It was cool out at night and They offered to deliver electric heaters to the house for our comfort. I trusted these guys with the heating of my home and they all delivered, and then some. The Viessman Combi Boiler has run flawlessly for 6 months, and saved me over 40% in natural gas. Great Investment.