Jump Start 45W Seedling Heat Mat - 20" x 20"

The 20" × 20" surface comfortably fits two standard 10" × 20" propagation trays side by side, similar to the components included with the Jump Start 72-Cell Hot House. You can also use it with a single larger flat, multiple smaller containers, or a combination of pots arranged across the square footprint. Any container sitting on the mat will receive consistent bottom heat from the 45W heating surface.

The mat can be plugged directly into a standard 120V outlet and will run at a fixed output without a thermostat. For growers who need precise, crop-specific temperature control, the Jump Start Digital Temperature Controller is fully compatible and sold separately — it's especially recommended at 45W to avoid overheating sensitive seedlings in warmer ambient conditions.

Both mats share the same multi-layer construction, waterproof build, UL listing, and 6-foot cord — the key differences are surface area and wattage. The Jump Start 17W Seedling Heat Mat (8.875" x 19.5") is sized for a single standard tray, while this 20" × 20" model at 45W covers a larger square footprint suited to two trays or wider container setups. Choose based on your propagation volume and available bench space.

Yes. The mat is fully waterproof and designed to handle incidental water contact and splashing without performance loss or safety concerns. Avoid submerging the mat or allowing standing water to pool at the cord connection point, and follow standard safe-use practices for powered equipment in wet environments.

The mat surface includes printed guidance covering light requirements, watering practices, and planting tips — a useful quick reference for newer growers or anyone starting a new crop type. For full setup and safety instructions, refer to the downloadable instruction sheet linked above.

Yes. The mat is UL listed and built for continuous operation. Running it with a thermostat is the recommended approach at 45W, as the controller will cycle the mat on and off to maintain your set temperature rather than running at full output continuously — which improves both energy efficiency and precision across varying ambient conditions.