Hello all. Just had a new Raypak 2100 heater installed and have a question about water flow. I have a Jandy valve plumbed in such that I can bypass the heater, or make all of the water flow through the heater, or split the flow half through the heater and the other half out the return line. What is the best way to set the valve to obtain the most efficient heating. Thanks for any reply.
View attachment 36389
View attachment 36389