Jump Start 17W Seedling Heat Mat - 8.875" x 19.5"

The mat can be plugged directly into a standard 120V outlet and will operate at a fixed output without a thermostat, raising root-zone temps 10°F–20°F above ambient continuously. For growers who want precise, crop-specific temperature control, the Jump Start Digital Temperature Controller for Heat Mats is fully compatible and sold separately.

The Jump Start mat uses a multi-layer construction with a strong internal heating wire that is 50% thicker than competing mats. This added thickness improves both heat uniformity across the mat surface and physical durability, making it more resistant to wear, puncture, and the demanding conditions of greenhouse and commercial propagation environments.

Yes. At 8.875" × 19.5", the mat is sized to sit beneath a standard 10" × 20" seedling tray with the tray extending slightly beyond the mat edges — which is intentional, ensuring the heat concentrates under the root zone rather than dissipating outward. This sizing makes it compatible with the full range of standard propagation trays and inserts, including the Jump Start Smart Float 55-cell grow tray.

Yes. The mat features fully waterproof construction designed to handle the watering and humidity conditions typical of propagation work. Incidental water contact and splashing are within its design tolerance. That said, avoid submerging the mat or allowing water to pool around the electrical cord connection point — standard safe practices for any powered device in a wet environment apply.

This is the same 17W mat included in kits like the Jump Start Germination Station and Hot House, sold here as a standalone unit. It's the right choice if you already have trays, inserts, and domes and just need a replacement or additional mat — or if you prefer to build your propagation setup à la carte.

Yes. The mat is UL listed and built for continuous operation throughout the growing season. Leaving it on between cycles poses no safety concern, though unplugging it when not in active use is a reasonable practice for energy conservation. When running a thermostat, the controller will cycle the mat on and off automatically to maintain your set temperature, further reducing unnecessary run time.