The recirculating pump controller is working well. Software has gone through 6 iterations over the past several years. It's now time to upgrade the hardware on a test field unit and see what happens. Update concept shifts from Arduino Uno to Teensy 3.2 CPU running version 6.1 of the core code. Objective is to shrink the size of the finished product box by 40%, lower total assembly cost, and improve performance. We also changed out the 4x20 LCD screen for a 240X320 TFT display which will allow us to draw some graphs of temps over time or other information.