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Hydrofarm MT10009 48-by-20-Inch Seedling Heat Mat

4.6 out of 5 stars 1,051 customer reviews
| 82 answered questions

List Price: $89.95
Price: $43.21 & FREE Shipping on orders over $49. Details
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48 inches x 20 inches
107 Watt
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  • Seedling heat mat for better veggie, herb, and flower seed germination
  • Warms root area 10 to 20 degrees over ambient temperature
  • Increases the success of seedlings and cuttings
  • UL listed, waterproof construction retains moisture for optimal safety
  • Includes 6-foot power cord, instructions; UL listed
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$43.21 & FREE Shipping on orders over $49. Details In Stock. Ships from and sold by Amazon.com.

Frequently Bought Together

  • Hydrofarm MT10009 48-by-20-Inch Seedling Heat Mat
  • +
  • Jump Start MTPRTC, Digital ETL-Certified Heat Mat Thermostat for Seed Germination, Reptiles and Brewing
Total price: $70.14
Buy the selected items together

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Size: 48 inches x 20 inches | Style: 107 Watt
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Product Description

Size: 48 inches x 20 inches | Style: 107 Watt

The Seedling Heat Mat uses 107 watts to warm root area 10 to 20 degrees over ambient temperature and improve seed germination and increases the success of seedlings and cuttings. UL listed, waterproof construction with six foot power cord.

Product Information

Size:48 inches x 20 inches  |  Style:107 Watt
Product Dimensions 20 x 48 x 3 inches
Item Weight 1.7 pounds
Shipping Weight 3.1 pounds (View shipping rates and policies)
Manufacturer Hydrofarm
ASIN B000E3B8XG
Item model number MT10009
Customer Reviews
4.6 out of 5 stars 1,051 customer reviews

4.6 out of 5 stars
Best Sellers Rank #53,735 in Patio, Lawn & Garden (See Top 100 in Patio, Lawn & Garden)
#18 in Patio, Lawn & Garden > Gardening > Indoor Gardening & Hydroponics > Heating Quilts & Mats

Technical Specification

Warranty [pdf ]

Warranty & Support

Product Warranty: For warranty information about this product, please click here. [PDF ]

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Customer Questions & Answers

Customer Reviews

Top Customer Reviews

By J. DERAMO on April 19, 2009
Verified Purchase
We are home gardeners and have tried many ways to provide bottom-heat for vegetable seed germination -- atop my always-on docked laptop was the most effective but the space was tiny. We bought a 20" x 20" heat mat and now have the right tool for the job. We set it up on a card table and found that it was not providing sufficient heat to the soil in the trays above. After an overnight on the mat, the soil surface was less than 10 degrees above ambient temperature. The room where the seeds are was 60 degrees overnight, and the soil surface in the trays was 68 degrees -- certainly not good enough for eggplant germination. I used an infrared thermometer (Raytek Minitemp MT6 here on Amazon) to check all temps. The exposed mat surface (no tray on top) was 82 degrees. I felt the surface on the underside of the card able and it was definitely warm, indicating heat loss downward. I wanted all of the heat to go up into the soil, so I cut a piece of rigid-foam insulation just slightly larger than the heat mat (22" x 22") and put it under the mat. Within 15 minutes the exposed surface of the mat was at 97 degrees and when I moved a tray to measure the temp of the mat beneath a tray, it was at 115 degrees. 2 hours later, the soil surface temperature was at 85 degrees. I am now confident the soil will get enough heat for proper germination, and I will begin using the heat mat thermostat to regulate soil temps based on the particular seeds we're starting (search the Web for "vegetable seed germination temperatures" to find one of the many reference charts available). We can also regulate temperature by covering or uncovering the trays to change the rate of evaporative cooling. We are well aware that covered soil is more prone to damping off/seedling death, which we now control with a spray of strong-brewed chamomile tea.
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Style Name: 17 WattSize: 9 inches x 19.5 inches Verified Purchase
I love this heat mat. I use it for 7 day periods with it on 24/7 (no thermostat) placed underneath the gallon glass jar in which the kombucha I brew resides. It brews much faster in higher temperatures, and this heat mat provides 10 degree increase without ever getting dangerously hot.
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Style Name: 7.3 WattSize: 3 inch x 20 inch Verified Purchase
Not sure exactly why people say it's great, and then rate it 4 stars without any reason for the knockdown???

The mat is great and does exactly what it's supposed to...creates a nice warm pad for beneath some windowsill starter "greenhouse" kits. It raises the temperature of the soil, and makes the environment within the planter even more warm and humid.

For the record, I bought both the"Jiffy 5710 12-Pellet Indoor Plant Start Greenhouse" and the "Hydrofarm JS12GH Jumpstart 12-Pellet Indoor Seed Start Greenhouse" (Sorry, Amazon wont' let me link them at the moment) and you can fit TWO of either of these on the mat...which made it a great investment. 24 plants are getting the heat. (For the record, I liked the Hydrofarm greenhouse better due to a nicer plactic lid).

BUT, the first few days I noticed that all the heat was probably going into my cold cold windowsill. SO, I picked up some cork trivets for cheap (either on Amazon or your favorite Bed and Bath type store), placed them on the windowsill, heating mat on top, and the planters on top of that. Next day the difference was very evident. Extremely foggy planters and the bottom was very warm. I think the plants are VERY appreciative. Make sure you insulate the mat or risk losing all your heat into whatever you have it placed on.

Going to pick up another one or two of these. I don't have room for the 25 planter starter greenhouses, but I can fit 2x12 in two different windowsills just fine.
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Style Name: 17 WattSize: 9 inches x 19.5 inches Verified Purchase
I bought this heat mat to get my seeds started inside. Since my apartment is cold and seeds like heat I thought i'd give it a try. Three days after I planted my seeds I had a ton of sprouts. Nearly every seed germinated. If you need some extra warmth to get your seeds going definitly get one of these heat mats.

It didn't get too hot and I was able to keep it right on my countertop. My only problem was I should have had a light to put over my seedlings once they sprouted. It's very easy to use as you just plug it in and put your tray on top. The instructions are even written right on the mat itself.
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Style Name: 45 WattSize: 20 inches x 20 inches Verified Purchase
The first time I have tried using a heat mat. I placed the mat on a sheet of 3/4" styrofoam insulation and set my covered seed trays on top. I planted presoaked seeds of tomato and pepper. In two days I had sprouts. This was in a cool (50 degree)greenhouse. The temp inside the seed trays was 80-85 degrees.
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Style Name: 17 WattSize: 9 inches x 19.5 inches
I have this heat mat and used it last spring for starting my seeds. I like that it only uses 17 watts of electricity - about the same as a compact florescent light bulb.

This fall, I discovered a second use for it. I put it under my desk at my home office to keep my feet warm -- I get cold toes in my 1850s farmhouse. Most toe warmers I've seen use 50-60 watts of electricity. The efficiency of this little heat mat is great.
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Style Name: 45 WattSize: 20 inches x 20 inches Verified Purchase
This mat does the job! If you have a couple of seed flats to warm, this mat will suffice. On the other hand, if you, like me, really enjoy starting plants from seeds, you may want a larger size mat (or more than one of this size). In any case, this one does exactly what it is supposed to do: it gently (and reliably) warms seed flats until the seeds sprout.
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