Click here for the Ultra-HECS Controllers Data Sheet

Ultra-HECS™ Controller Overview

Summit’s Ultra High-Efficiency Control System (Ultra-HECS) controls or unmatched patented energy efficiency combining an ambient temperature sensing RTD and a temperature controller in series with Summit’s temperature sensing RTDs, controllers, and solid state relay circuitry to provide the ultimate in energy-efficient roof ice melt system performance.

The ambient controller powers Summit’s roof panels only when the ambient temperature is between the Heater-On set point and the Low-Temperature Cutout set point (both field-adjustable).

When this condition is met the Ultra-HECS will adjust the power level to Summit’s roof panels to maximize efficiency and keep them at the maintained temperature set point (field-adjustable). As temperatures drop and winds increase, the controller increases the heating cable output.

Percent of Steady
State of Power
27-30°F, Light Winds 20-25%
27-30°F, Strong Winds 35-50%
20-25°F, Light Winds 40-60%
20-25°F, Strong Winds 50-70%
10-15°F, Light Winds 60-90%
10-15°F, Strong Winds 100%

Figure A: Energy Loads for Various Weather Conditions

General Information

Summit’s Ultra High-Efficiency Control System (Ultra-HECS™) is UL Listed and has been updated to have the most modern technology available to provide the most reliable performance ever. It is specifically designed to combine the patented energy efficiency of the PRO™ and LT™ Roof Ice Melt Systems with multiple sensors to dramatically reduce energy consumption. At the onset of snow accumulation the building manager engages the heating system by turning on the main and branch circuit breakers.

A temperature sensor measures the outside air temperature and only permits the Summit panel controllers to power the heating cable when the ambient temperature nears freezing (e.g., 34°F). The Summit panel controllers then maintain the roofing panels above freezing (e.g., 40°F) so that snow melt will not re-freeze and form icicles and ice dams at the eaves. Summit’s systems use self-regulating heating cables as the source of heat and are designed to handle most worst-case winter storm conditions.


True Energy Efficiency

Our Ultra High-Efficiency Controllers are designed to perform using a fraction of the energy required by others. For example, Summit’s patented PRO Roof Ice Melt System uses 1/3 less electricity than any other Class 1 heavy snow area system. As a result, Summit’s PRO’s circuits extend 1/3 further than the others.

When the Ultra-HECS is used in combination with Summit’s systems, the energy savings extends well beyond that. For example, when ambient temperatures are in the 20-32º F. range, only a portion of the heaters’ energy is required for proper operation. The Ultra-HECS modulates power to the heaters, keeping the energy consumption to a minimum.

If a simple ambient temperature sensing controller were used, the systems’ Cover Panel temperature would range from 40 during extreme winter conditions (10-15°F, snowing, windy) to 70°F during milder winter conditions (25-32°F, calm, sunny). Figures B and C show the relative energy consumption for an ambient on/off controlled system versus the Ultra-HECS for two winter days. The Ultra-HECS reduces Summit’s energy consumption by 40-60% during mild winter days and by 10-40% during colder and stormy winter days. For the average winter, energy savings should average around 35%.

Figure B: Extreme Winter Day


Figure C: Mild Winter Day

Low Ambient Temperature Options

Snow melt at the roof/snow interface depends on the roof snow depth, ambient temperature, roof design, and building insulation, so there are low ambient temperature conditions when no snowmelting occurs. For new construction in heavy snowfall areas, temperatures below a -10°F range will most often create “no snowmelting” conditions. The Ultra-HECS includes a control panel mounted solid state controller and an eave soffit mounted RTD temperature sensor.

The temperature at which Summit systems turn on can be set and adjusted at the control panel (we recommend 36-40°F). In addition, the Low-Temperature Cutout feature can be set at the control panel (we recommend -10°F to start) and can then be adjusted up or down based on the local winter conditions for the building.

For example, if 10°F is the proper Low-Temperature Cutout set point and the winter had 150 hours below 10°F, up to 10% energy savings can be realized when compared to a control system. Figure D demonstrates how the low temperature cutout option would typically operate without the low temperature cutout option operating.



When compared with standard ambient-only temperature control, the Ultra High-Efficiency Control System can provide up to 50% energy savings for a typical winter, particularly in heavy snow, Class 1 Snow Areas. In addition, up to 10% more energy savings can be realized when using the low temperature cutout feature.


  • UL Listed by Certified UL-508 Shop Designed, Constructed,
    Tested, and Approved
  • Designed to control multiple zones of all roof and gutter circuits
  • Includes controller and power distribution
  • Power distribution includes distribution blocks and modular, mounted
    branch circuit breakers and 30mA ground fault (EPD) breakers
  • Integrated timers to delay operation for interval activation between
    circuits to manage inrush current load
  • Utilizes solid-state relays for quiet and efficient operation
  • Accommodates 1-phase or 3-phase incoming power
  • Operates on 208, 220, 240, or 277 Vac
  • Ambient controller sensor displays ambient temperature
    and Heater-On set point
  • Multiple separate control zones available
  • Up to 18 branch circuits with ground fault protection
  • Summit Panel Cover controller sensors display Panel Cover
    temperature and set point
  • NEMA 1 or 4/12 enclosures available
  • PROUDLY built in the U.S.A.

Figure D: Low-Temperature Cutout Operation