Where the World Shops for Energy
  Home » Shop » Goldline » GL30 LogIn  |  CheckOut   
Solar PV Electric
Water Heaters
Space Heating
Pool Heaters
Pool and Spa
Water Conservation
Wind Power
Energy Savings
Outdoor Lifestyle
Parts & Supplies
Great Gift Ideas!
Clearance and Sales
New Arrivals
9am - 5pm EST M-F
800 333 9276
941 360 9276
Sales Support
Tech Support
Contact Info
Legal | Policies
Mailing List

Email Address:


Solar Direct, Inc. is a BBB Accredited Business. Click for the BBB Business 
Review of this Solar Energy Equipment & Systems Dealers in Sarasota FL
Credit Card Processing

 © 2022 Solar Direct
 All Rights Reserved
Goldline GL-30 Solar Control Unit
   Model: GL30
Goldline GL-30 Solar Control Unit
CLICK dropdown arrow in selection boxes to
    configure product and determine total cost.

Base Price:  $218.77
    Shipping based on delivery destination:
        For Shipments Outside of the Contiguous US please Contact Us for a Quote
            Optional Installation Services
            Tell Someone About This Great Deal!
            Found a lower price? Let us know![?]
In Cart
Processing: 1 - 3 Business Days
Plus Transportation Time

    goldline control unitIncludes control unit only. Please click below for other options:

    Control Unit with power cord
    Control Unit with sensors
    Control Unit with power cord and sensors

    Goldline GL-30 Solar Control Unit - 110 Volts

    The Goldline GL-30 differential temperature control is designed to provide maximum operating efficiency and flexibility to effectively manage today's innovative solar energy systems. It is a continuation of the advanced electronic technology which produced the popular C-30 and CM-30 controllers - standards of the solar industry since 1975, with hundreds of thousands of units installed worldwide. With an adjustable high limit of 50º-104ºF, the GL-30 is capable of handling most differential temperature control functions for operation of domestic water heating and sophisticated space heating and cooling. The GL-30 is designed to control recirculation, drain-back and closed loop systems.

    Replacement unit for CM30 and C30:
    Control does not include power cord or sensors [must be purchased separately or in a package]
    Two SB-10K sensors may be required. [sold separately]
    NOTE: TD-GL & DIX-30 Temperature Displays are discontinued

    LED Indicators
    Three highly visible LEDs show:
     Power to control 
    Power out from control
    Power out from control due to a recirculation mode to protect
    the system from freeze damage.

    GL-30 Output
    The GL-30 output is rated at 20 Amps and is designed to directly
    operate a pump or fan for heat collection when the controller is sensing an appropriate temperature differential.

    The GL-30 has an adjustable differential with a range of 8º to 24ºF. Solar systems with long pipe runs normally require a higher
    turn-on differential temperature, and open loop systems with short pipe runs usually require a lower turn-on differential temperature for optimum performance. The GL-30 offers versatility to tailor controls to numerous specific systems designs.

    Storage High Limit

    The GL-30 allows you to set a high limit storage temperature from 110º to 230ºF.

    Recirculation Freeze Protection
    Recirculation freeze protection, when enabled, turns the GL-30
    output on to circulate warmer storage water through the collectors when near freezing temperatures are reached at the collector sensor.

    System Test Switch
    The system test switch manually switches the GL-30 to ON, AUTO,
    or OFF for complete control over the system at all times.

    Product Application: Solar Domestic Water Heating System


    HELP » Contact Customer Support
    Toll-Free help line offering product info and ordering support
    Online e-mail technical and installation support

    A complete typical solar domestic water heating system components and layout is shown below.

    Product Features:
    Differential temperature control
    8-20ºF adjustable turn-on differential
    4ºF fixed turn-off differential
    110-230ºF adjustable high limit
    120/240 VAC input
    20A, 2HP output

    Product Specifications:
    Input power: 120 VAC or 240 VAC
    Output: SPDT powered contacts 1HP@115VAC, 2HP@240VAC
    rating @ 240VAC: 20A on NO contacts ; 10A on NC contacts
    Differential: 8/4 to 24/4°F
    High Limit: 110° to 230° F
    Environment: 15° to 130° F; 0 to 95% rH
    Accuracy: +/- 1°F
    Dimensions: 5.875" x 4.875" x 2.375"
    Temperature Sensors: Thermistor 10k @ 25°C/77°F not included

    Inside View Of Circuit Board

    Inside view
    of the
    circuit board

    Product Installation:
    View the following manual for installation and troubleshooting

    Download » Product Installation Manual
    Download » Goldline Warranty

    General Control and Sensor Trouble-Shooting Tips:

    All of the GoldLine (formally Independent Energy) controls (including C30, CM30, G30 and GL30 series) and some of the Heliotrope General (HG) DTT series controls incorporated the use of 10k sensors.  Some of the earlier HG controls and some other lesser known brands used 3k sensors.

    To determine the type of sensor, the resistance must be measured in ohms (using a volt/ohm meter) when the sensor is at 77 degrees F.  10k measures 10,000 ohms and 3k measures 3,000 ohms. As the temperature goes up, the resistance goes down. 

    Resistance can be checked at any temperature, and then
    convert the ohm reading measured to the temperature equivalent
    by using the conversion chart.

    Sensors can be purchased at
    Water Heaters Parts and Supplies

    Product Manufacturer: Goldline Controls Inc.

    Product Warranty: 10 Year Limited Warranty
    Goldline Controls Inc. now offers a full 10 year limited
    warranty on all solar controls and accessories! This warranty
    will cover repair or replacement of the control at no cost for
    the first 24 months. For years 3 through 5, the repair/
    replacement fee will be a maximum of 25% of the current list
    price, and for years 6 through 10, the repair/replacement fee
    will be a maximum of 50% of the current list price. The best
    controls now have the best warranty. See the Goldline
    warranty statement for detail.


    Processing and Delivery Information: Please allow Processing Time as stated above for your order, plus standard transportation delivery time. Orders placed after 2PM EST may not begin processing until the next business day. Please call for Rush Processing and/or Rush Shipping options.

Reviews In Cart

Customers who bought this product also purchased
Heliocol CPVC Pipe Connector - Model HC-117
Heliocol CPVC Pipe Connector - Model HC-117
CLEARANCE: Heliotrope Solar Roof Sensor for use with Solar Control. Model: AS2-10K
CLEARANCE: Heliotrope Solar Roof Sensor for use with Solar Control. Model: AS2-10K
Stainless Steel Hose Clamp<br>#40 2 Inch<br>For Sealing Rubber Couplings<br>onto Panel Header Pipe
Stainless Steel Hose Clamp
#40 2 Inch
For Sealing Rubber Couplings
onto Panel Header Pipe
Stainless Steel Screw For Fastening Butterfly Clip or SuperClip onto Roof or Rack
Stainless Steel Screw For Fastening Butterfly Clip or SuperClip onto Roof or Rack
CLEARANCE: Heliotrope 3-Way FloVerter Valve for automatic solar control. Model: FV-2.0
CLEARANCE: Heliotrope 3-Way FloVerter Valve for automatic solar control. Model: FV-2.0
Pipe Clamp<br>For Mounting PVC Piping<br>onto Wall / Roof Applications
Pipe Clamp
For Mounting PVC Piping
onto Wall / Roof Applications
Quick Search
Enter keywords

• Advanced Search
View all Products
View Cart more
0 items
Manufacturer Info
Other products
Invest in Solar
Promote Solar
Installations more
Professional installation available for most products.
Call us today for custom orders & installation quotes.
Solar Affiliates
Solar Affiliate Program

Affiliate Log In
Solar Affiliate Program
Great Deals
Tell A Friend
Tell someone you know about this product.
Connect with Us
      follow us 
on facebook Facebook
      follow us on twitter Twitter