It is always important to hire only qualified tradesmen when you want to have a water heater installation done efficiently. There are cheaper methods to go but in the future the cheaper ways costs more. The reason for for the reason that an unqualified water heater installer may cause conditions will develop in the future. If the future rolls around this unqualified hot water heater installer will be nowhere found. At that point you will have to speak to a qualified installer to get it done right.
It is easy to discover a qualified tradesmen to install your water heater. You just need to go to a few construction sites and enquire of the builders who they normally use. Builders will only use reputable hot water heater installers because they do not have the time to waste on incompetent installations. Also, builders have a very reputation to maintain plus they do not want to ruin it by hiring a sub-par installer.
Once you have chosen your qualified installer make sure that you have everything detailed on paper. When you put all things in writing there can be no misunderstandings later on. Therefore, hire merely a qualified installer and everything will be fine.