SunBlaster Digital Heat Sheet Controller

Precision Temperature Control for Heat Mats and Growing Medium

A heat mat run without any feedback stays at a single fixed output regardless of what the growing medium actually needs, which can leave seeds or cuttings too warm on some days and too cool on others. SunBlaster's Digital Heat Sheet Controller closes that loop, reading root-zone temperature from a probe and adjusting power to the mat to hold a specific target.

The controller uses a water-resistant stainless steel probe on a suction cup mount with a 6-foot cord, and its large, bright display shows readings in Celsius or Fahrenheit for growers tracking a specific germination temperature target.

Key Features & Benefits

• Water-Resistant Stainless Steel Probe — reads root-zone temperature directly rather than relying on ambient air.
• Suction Cup Mount With 6-Foot Cord — positions the probe at the tray while the controller sits elsewhere.
• Large, Bright Display — shows readings in Celsius or Fahrenheit for easy monitoring.
• Works With SunBlaster and Other Heat Mats — compatible with the SunBlaster Heat Sheet and seedling heat mats generally.

Who Should Use This Controller

This controller fits growers who need a specific, consistent root-zone temperature rather than whatever a heat mat happens to put out at a fixed setting, including growers propagating temperature-sensitive cuttings or running multiple trays that need to match each other.

About SunBlaster

SunBlaster designs propagation hardware, including heat mats and temperature controllers, from its base in Langley, British Columbia, building the Digital Heat Sheet Controller to pair with its own Heat Sheet mat as well as seedling heat mats from other manufacturers.

Frequently Asked Questions

How do I set up the temperature probe?

The water-resistant stainless steel probe attaches with a suction cup mount, typically placed directly in the growing medium or against the tray so it reads root-zone temperature rather than ambient air. The 6-foot cord gives enough reach to route the probe to a tray positioned away from the controller itself.

Does this work with heat mats from other brands?

It's designed for use with the SunBlaster Heat Sheet and is built to work with seedling heat mats generally, not just SunBlaster's own line. Confirm the mat's power draw falls within the controller's rated capacity before pairing them.

Can I switch between Fahrenheit and Celsius?

Yes, the display shows temperature readings in either Fahrenheit or Celsius. Switch between the two to match whichever unit a grower is used to working in.

Why use a digital controller instead of running the mat at a fixed output?

A heat mat run without a controller stays at one fixed output level regardless of the actual root-zone temperature, which can overshoot on a warm day or undershoot on a cold one. The digital controller reads the probe continuously and adjusts power to the mat to hold a specific target temperature instead.