Quick question that may be a dumb one. When heating your spa is there an ideal rpm setting for maximum heat rise with minimal time running the heater?
I have a Jandy LXI 400KBTU heater and Jandy 2.0hp vs EPump. My pool builder set the default speed to 2250RPMs' when the spa is heating, it seems to jump up to full jet speeds at 3450rpms some of the time when i put it to spa mode and heat on, sometimes i override it to the 2250 sometimes i let it run full speed. The manual calls for 75gpm flow through the heater for ideal working flow while heating. I can't find anywhere where i could figure with my pump running what speed will give me that ideal heating flow rate. obviously the lower speed setting uses less energy and the slower flow I would think would allow the water to heat better as it passes through the equipment.
Right now its taking about 30 mins to go from the high 70s to 104, and and hour to 104 if the pool is colder high 60s/low70s.
Any ideas of the ideal setting from anyone with an epump or similar variabel speed pump