In a previous post I was inquiring about the proper place a heater should take in a system (before the SWG). I was ready to go and buy tubing but made the mistake of reading too much and got caught up in the highly interesting but so complicated hydraulics 101 post.
80% of my tubing is 2", only the section following the SWG leading to 6 jets is 1.5". I'm starting to understand my pool is "different" because of all those jets in the sitting area and believe the 1.5" tubing is to increase psi?
Now, I'm about to add 2 valves to connect my heater (heat exchanger). This heater has 1.5" in/out connectors and will be located approximately 30' from the valves (adding 60' of tubing). I was told it's better to bring the cold water (pool water) further versus loosing precious hot water (water that will make a very short loop through the exchanger and return to the gas hot water tank).
Since the exchanger has 1.5" connectors should I keep the 2" size all the way and simply reduce/enlarge at the exchanger? Is there an advantage to use flexible tubing versus rigid? Don't 90° connectors of rigid tubing increase head loss thus advantaging flexible ones?