The 5 Best Seedling Heat Mats and Thermostats

Ed Wike
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It’s not easy to find the best seedling heat mat in today’s marketplace. Not only do a lot of different products exist, but seedling heat mats have been improving steadily over the last few years.

It’s also pretty confusing and there are plenty of heat mats on the market that don’t meet your needs properly, which is why I created this guide. This post does some of the heavy lifting for you and compares and contrasts the best seedling heat mats and thermometers.

NameCategoryProduct
VIVOSUN Durable Waterproof Seedling Heat Mat Warm Hydroponic Heating Pad 20" x 20" MET StandardBest OverallVIVOSUN Durable Waterproof Seedling Heat Mat Warm Hydroponic Heating Pad 20" x 20" MET Standard
Growerology Waterproof Seedling Heat MatBudget PickGrowerology Waterproof Seedling Heat Mat
iPower 54W 4 Feet T5 Fluorescent Grow Light Stand RackUpgrade PickiPower 54W 4 Feet T5 Fluorescent Grow Light Stand Rack

1. VIVOSUN Durable Waterproof Seedling Heat Mat Warm Hydroponic Heating Pad 20" x 20" MET Standard

Our rating: 9 / 10

VIVOSUN Durable Waterproof Seedling Heat Mat Warm Hydroponic Heating Pad 20" x 20" MET Standard

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Pros:

  • The sensors are built directly in the mat to give an accurate temperature reading
  • Excellent customer service and very durable
  • The power cord is plenty long for easy access
  • It won’t overheat unless you place it directly against the wall
  • Excellent warranty

Cons:

  • Won’t heat up unless there is moist
  • Not the prettiest product out there

Vivosun is a name you can rely on when it comes to seedling mats and thermostats, and it is for a very good reason. Vivosun offers three models to choose from depending on your seedling’s needs.

All of them are made with high-quality materials, and they are all waterproof so you can use them for pots with holes or irregularly shaped pots. It has an excellent temperature range – between 64-90 degrees.

The thermostat at the bottom of the mat is integrated into the mat, so the readings will be very accurate and precise. Most mats out there have sensors on the cord, which will cause some interference with the readings.

2. Growerology Waterproof Seedling Heat Mat

Our rating: 9 / 10

Growerology Waterproof Seedling Heat Mat

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Pros:

  • 6-month plant grow guarantee
  • Dishwasher safe
  • You can plant directly into the mat
  • If there is a problem with your product, you can contact Growerology and a replacement will be sent out
  • It's only available in the US

Cons:

  • It is very difficult to remove from the base stand
  • The temperature reads a bit high (probably due to where the sensor is placed in the mat)

Lastly, our best pick for seedling heat mats in the Growerology Waterproof Seedling Heat Mat for Seed Germination, Hydroponics and Plant Propagation. It is an extremely safe, low-emission technology with no radiation. It allows temperatures to be even. And the heat will not dry out your plants.

One thing we did notice with this product is that the temperature can read about 5-10 degrees higher than it actually is. This maybe due to the sensor being placed in the middle of the mat.

The Growerology is a big investment, but it is worth it since it comes with a 6-month plant grow guarantee. It is available in two sizes: 10.24" x 20.75" and 15.75" x 20.75". And four colors: black, white, brown, and tan. You can also purchase an optional base stand to place underneath the mat for easy storage (14.

3. Hydrofarm Jump Start MT10009

Our rating: 8 / 10

Hydrofarm Jump Start MT10009

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Pros:

  • Affordable price
  • Easy to use
  • Stand and shelves included
  • Expandable, can be attached to another mat
  • Better than using a hot water pan
  • Safe to use in a small greenhouse
  • Easy to move

Cons:

  • It’s not food-grade quality
  • It can leave cold spots
  • It’s not an automatic controller

The Hydrofarm Jump Start MT10009 is an electric seedling heat mat. It comes equipped with an adjustable thermostat for consistent heat. It’s perfect for seedlings, plants, and tropical fish. The mat’s power cord comes with a grounded 3 prong plug.

The Jump Start MT10009 seedling heat mat has an electrically conductive aluminum surface for optimal heat distribution. It’s durable enough to be used in a greenhouse, indoors, or outdoors. Plus, it’s NSF approved which means that it’s compliant with government safety standards.

The mat comes with two shelves that can be used to store your seedlings or farming tools. In addition, it comes with a stand that makes it easy to mount the mat on to your preferred surface for optimal use.

4. VIVOSUN 48"x20.75" Seedling Heat Mat and Digital Thermostat Combo Set

Our rating: 8 / 10

VIVOSUN 48"x20.75" Seedling Heat Mat and Digital Thermostat Combo Set

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Pros:

  • Does not overheat
  • Offers accurate monitoring/control of temperature
  • Excellent customer service

We prefer to grow our own food because we know what we’re actually putting into our bodies. Gardening also offers a sense of fulfillment and independence – and is super fun!

If you tend to be an indoor gardener, one of the most important gardening tools you need is heating mats and thermometers. This combo comes with the best of both worlds: a digital thermostat and cord-free heating mat that allows you to check and control the temperature from your smartphone!

This heating mat and uni-temperature digital thermostat combo offers the accuracy of a professional heating system. Even better, it’s incredibly comfortable for you to use – you don’t want containers hot enough for seedlings to burn. It’s also versatile as you can use it for plants, seedlings, and more.

5. iPower 54W 4 Feet T5 Fluorescent Grow Light Stand Rack

Our rating: 8 / 10

iPower 54W 4 Feet T5 Fluorescent Grow Light Stand Rack

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Pros:

  • reasonably priced
  • easy to use
  • sturdy build

Cons:

  • it might be too small for some uses
  • the thermostat functionality is not the best

The iPower SD-iHLN5-1000 T5 Grow light is a 54W 4-foot light that includes: (1) white T5 grow light bulb, (1) orange T5 grow light bulb, (1) electronic ballast, (1) grounded power cord, (1) water-proof socket, and (1) ground spike.

Frequently Asked Questions (FAQ)

How hot does a seedling mat get?

All the thermostats included in this section will allow you to control the temperature as your seedlings require. Some are more accurate than others so make sure to check the specifications before purchasing one. You’ll also want to consider the size of the mat. This is because mat sizes vary depending on the thermostat or temperature control included with the seedling pallet included.

Are seedling heat mats safe?

That depends on the product and your unique situation. Heat mats are safe for young plants, but you’ll need to recognize the risk and plan accordingly.

Fluctuating temperatures can result in unripe tomatoes or flowers that never open. Inadequate heat will also slow germination which can significantly delay the growth of your seedlings.

With the right heat mat, you can ensure consistent and steady heat so your plants flourish.

Should you need to adjust the temperature, thermostats do the trick.

Technically, any seedling heat mat can overheat if used for the wrong plants, in the wrong location, in the wrong way, or with the wrong thermostat.

The right seedling heat mat and thermostat will ensure safe warmth for your delicate plants and sensitive seeds.

How long do you use a heat mat for seedlings?

You should use a heat mat for germination for about 7-10 days. When the seedlings have sprouted, you can remove the mat, but continue maintaining proper room temperature and humidity for growing seedlings on the surface of the soil.

Do I need a thermostat for my heat mat?

If you’re going to use a heating pad for seedling who are used to warm temperatures all the time, you won’t need a thermostat. But if you monitor the temperature of your seedlings by making sure the room is warm and they are cozy, you may prefer to use a thermostat and avoid constant monitoring. These are also useful if you live in an area where the temperature periodically fluctuates, or if you’re growing in an enclosed space where you can’t monitor the temperature without risking damaging your seedlings.

Conclusion

When choosing a heat mat for your seedlings, you should be looking for a product that’s durable, reliable, and energy efficient. We found that the Sunmate SM-SSR-25 and the Hydrofarm Mercury1550 are two top contenders when it comes to these characteristics. These products use minimal energy to help deliver a maximum amount of heat to your plants.

Our Recommendation

NameCategoryProduct
VIVOSUN Durable Waterproof Seedling Heat Mat Warm Hydroponic Heating Pad 20" x 20" MET StandardBest OverallVIVOSUN Durable Waterproof Seedling Heat Mat Warm Hydroponic Heating Pad 20" x 20" MET Standard
Growerology Waterproof Seedling Heat MatBudget PickGrowerology Waterproof Seedling Heat Mat
iPower 54W 4 Feet T5 Fluorescent Grow Light Stand RackUpgrade PickiPower 54W 4 Feet T5 Fluorescent Grow Light Stand Rack