In fairness to all, we don't discuss pricing on the Wall. Thanks for your cooperation.
Goldline GL30 or Teckmar156
I have an older Grumman Sunstream solar system with a SigmaRho 180 differential controller. The controller is starting to go after 30 years. Either the Goldline GL30 or theTeckmar156 controller would be an appropriate replacement, using the existing 10k ohm sensors. The pumps draw about 1.5 amps, well within the controllers' specs. This is a simple on/off control strategy. The existing differential is 4 deg. and not adjustable. The Goldline seems a bit simpler. I'm looking to basically duplicate what's there. Any experience with reliability with either of these two units? thanks, Mark S.