SunBlaster Heat Sheet Propagation Heating Mat, 9.1"x19.7"

A Root-Zone Heat Mat With Setup Instructions Built Right In

Cold growing media slows germination and rooting even when the air above the tray is warm enough, since roots respond more to the temperature directly around them than to ambient room air. SunBlaster's Heat Sheet Propagation Mat sits under a tray and warms the root zone directly, raising it up to 20 degrees Fahrenheit above ambient air temperature to speed up germination and rooting.

The mat's full setup and safe-use instructions are printed directly on its surface, so there's no separate manual to dig up when it's time to set up a new tray.

Key Features & Benefits

• Warms Root Zone Up to 20°F Over Ambient — raises media temperature to improve germination and cutting success.
• Instructions Printed on the Mat — setup and safe-use guidance is built into the product, not a separate insert.
• Low 17-Watt Draw — runs continuously on a standard household outlet without a dedicated circuit.
• Sized for a Standard 1020 Tray — measures 9.1 x 19.7 inches to fit under a standard propagation tray.

Who Should Use This Heat Mat

This mat fits growers starting seeds or rooting cuttings in a room where ambient temperature runs on the cool side, including basements, garages, and unheated grow spaces where root-zone warmth would otherwise lag behind the target range.

About SunBlaster

SunBlaster, based in Langley, British Columbia, builds propagation heating hardware alongside its lighting and tray lines, pairing the Heat Sheet mat with its own Digital Heat Sheet Controller for growers who want adjustable, rather than fixed, root-zone temperature.

Frequently Asked Questions

How much warmer does the root zone get with this mat?

The mat is built to warm the root area by up to 20 degrees Fahrenheit, or about 11 degrees Celsius, over ambient air temperature. Actual temperature rise depends on the ambient room temperature and how much growing medium sits above the mat.

How do I know if I'm using the mat correctly?

Complete setup and usage instructions are printed directly on the mat itself, so there's no separate manual to track down or lose. Placing the tray directly on the mat, rather than on an intermediate shelf, gives the most consistent heat transfer to the root zone.

How much power does this mat draw?

The mat draws 17 watts, low enough to run continuously on a standard household outlet without a dedicated circuit. It measures 9 by 19.5 inches, sized for a standard 1020 tray.

Do I need a separate temperature controller?

Not necessarily; the mat runs at a fixed output level on its own. Pairing it with SunBlaster's Digital Heat Sheet Controller adds precise, adjustable temperature control if a specific germination temperature target matters for a particular crop.