Jon Klima, Owner
360 Trout Lane, PO Box 23, Guffey, CO 80820
Phone: 719 479-2281,  Email:
In business for 40 years





The Solar Controls Corp. 80-171RA is a basic ON/OFF digital differential temperature controller from the early 1980s for domestic hot water operation. This controller has a single 120 VAC output receptacle for the circulation pump. The output relay is rated at 10 amps or 1/4 HP @ 129 VAC or 10 amps @ 28 VDC. The controller incorporates a solid state operational amplifier to determine when the pump should be turned ON and OFF.


Tis controller utilizes two 30 K ohm thermosistor sensors for the collector and storage sensor.


I've tested this controller and its delta Ts are 20º/4º @ a storage temperature of 77 ºF, 23º/5º @ a storage temperature of 125.5 ºF, and 25º/4.5º @ a storage temperature of 154 ºF. The recirculation freeze protection starts at 39.5 ºF and the high limit shutdown happens at 191 ºF. Either recirculation freeze protection or high limit shutdown can easily be disabled by simply cutting the resprctive resistor on the PC board.


If you are looking to replace your defective Solar Controls Corp. 80-171RA controller or just want one as a backup, order this one today as it is the only one left. Prices shown do not include postage.  Colorado sales will be charged the appropriate sales tax. Yes, I accept credit card payments through PayPal, checks, and money orders.  For questions or to place an order, send me an email (see top of this page) stating what you are interested in along with your zip code.  I'll check the postage to your zip code and send you a return email with the total cost.



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This page was last changed on 2-26-2019