Just had a discussion with someone who may be coming out to install my plumbing for my pool equipment which I originally intended to do myself since I am very handy. This is my first pool so I just wanted to be sure. From the great support from the crew at TFP and the many online searches and videos stating adding a bypass valve on a heater is beneficial in more than one way, I want one installed. The installer is insisting there is never a need for them and is refusing to do it. He's insisting I do not know what I am talking about and has proceeded to tell me he has installed over 200 heaters and not one has a bypass valve. My pool will not have an automatic chlorinator and it will be chlorine not salt if that makes a difference. Thanks