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Hoss Germination Mat (100 Watt)


Our Hoss 100 Watt Germination Mat provides constant temperature to seed starting trays for germinating seedlings. 20.75″ wide x 48″ long. Large enough for our 162/338 Cell Seed Starting Trays or 6 of our 24 Cell Seed Starting Trays. UL Listed safe.

RECOMMENDED: Use with Hoss Germination Thermostat sold here.


Our 100 Watt Germination Mat allows you to maintain a constant soil temperature when germinating Seeds or propagating plants. The patented, double-layer construction is tough and waterproof, which makes it ideal for a wide range of growing situations. These work great in a greenhouse or indoor seed starting room. We highly recommend using with our Hoss Germination Thermostat to provide the best control of temperature.

This mat is 20.75" x 48" long. It is large enough to provide heat for our 162 or 338 Cell Seed Starting Trays. It is also large enough to hold 6 of our 24 Cell Seed Starting Trays or 12 of our 12 Cell Seed Starting Trays. This mat is essential when starting warm-season vegetable seedlings in the late winter months. It will drastically improve germination rates and germination time for peppers, tomatoes, eggplant, okra, melons, flowers and more!

Once Seeds have germinated, you may remove the trays from the heat mat if you need to use the mat to germinate other trays. You can also leave the trays on the mat as the seedlings grow. This will help to accelerate the growth and allow you to have transplants ready sooner than later.

Hoss 100 Watt Germination Mat Instructions:

  1. Place the mat on a stable, flat surface without any standing water.
  2. Insert the power plug into a standard 120V outlet.
  3. Place the propagation trays or other plant containers on top of the heat mat. If you have humidity domes for your trays, we highly recommend using them here to improve germination conditions.


  • 20.75" x 48”
  • 120 Volts
  • 100 Watts
  • 50/60 HZ


  • Use only according to instructions. Fire or electric shock may result from improper use.
  • Do not immerse the heat mat in water.
  • Make sure the surface underneath the heat mat is free of sharp points or objects which could damage it.

Customer Reviews

Based on 6 reviews
Pamela Bastian
Works great!

I had my mat on a wired shelf and it wasn’t heating. I called customer support and they told me to put something insulating under the mat. I put a double folded towel and it worked great!

Alistair Jones

Mat is durable and heats nicely. Definitely buy thermostat

Jennifer Baird
Hoss fan

Perfect mat, my veggies and herbs popped right up.

Peppers Loved It

I usually do all kinds of nutty things to get my peppers to germinate, including putting a tray of them in my oven with the light on to provide some warmth. Never had an accident, but this heating mat is definitely a step up lol. I love it and so do the peppers! And I don't expect it will break on me either.

Mike Boyd

Great advice and service