It’s easy if you are a qualified plumber that is experienced with Thermann hot water units. At Plumbdog we have worked with Thermann since we were pups and while we are licensed and qualified plumbers, we are also licensed gas fitters to which means we also issue the Certificate of Compliance when the job is done which is a requirement when gas works are completed. Thermann hot water systems need to be installed by a licensed tradesperson and in accordance with relevant codes.