Just a question. I am plumbing in a new heater into my system. 250k btu hayward heater. The diagrams for installing mention nothing of a bypass for the heater but in many diagrams I see there is a bypass of the heater with a valve in it. Is this necessary or not? If it is good is there any harm in having it bypass all the time when the heater is not in use. Does this help in keeping the pool heater to last longer since there won't be as much chlorine going through it. (Just picturing putting valves on the supply and return side of the heater so it can be compltley removed from the flow of water when not in use? Any help is appreciated.