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







The Now Devices Inc. (NDI) Apollo 44 is a basic ON/OFF differential temperature controller from the early 1980s for use with closed loop and drain back systems. This controller has a single 120 VAC output that is hardwired directly to the circulation pump. The output relay is rated at 1 HP at 120 or 240 VAC. The controller incorporates a solid state operational amplifier to determine when the pump should be turned ON and OFF. Two 30 K ohm sensors, one for the storage and one for the collector are required for the NDI/Apollo 44.


The ON and OFF Delta Ts are easily adjusted as are Freeze and Over-Temperature protection. Click here for a copy of the NDI/Apollo 44 Installation & Installation Manual.


If you are looking to replace your defective NDI/Apollo 44 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