4 Best Seedling Heat Mats With Thermostat For Germination


HTMLFont size

This post contains affiliate links. As an amazon associate I earn from qualifying purchase (at no extra cost to you)

Growing seeds requires the best germination conditions, especially warmth. This product review explains the most cost-effective seedling heat mats with thermostat that will speed up germination and maximize yield.

Since there are various types of seeds, there are different germination conditions as well. Seeds need enough light, air, moisture, and heat.

For urban gardeners, you may be starting seeds indoors. Hence, you might not have warm soil. A seedling mat is a waterproof growing medium that uses heating coils to produce constant warmth.

I’ve provided important details and tips in selecting the right seedling heat pad. These will help you keep the soil warm and test new seeds.

Once you’ve chosen a model, you can maintain the crucial germination environment to start early and harvest on time.

The guide below will help you pick the best seedling heat mat with thermostat that will suit your requirements to Start seeds indoors and produce your own transplants and get ahead on your spring garden.

At A Glance: Our Top Picks For Best seedling heat mat with thermostat Choices For 2019 

Top 7 Plant Heating Mat Thermostat: How Do They Compare?

The VIVOHOME Waterproof Seedling Heat Mat and Digital Thermostat Combo Set balances weight, right dimensions, sufficient power, and thermostat control.

This energy-efficient model can increase the growing temperature by 10 to 20 degrees Fahrenheit. As a result, you can maintain the warmth of up to 108 degrees Fahrenheit.

The VIVOSUN Seedling Heat Mat and Digital Thermostat Combo Set is at par with the first product in terms of temperature control.However, it takes up more wattage and space.

Yet, this unit is the ideal pick if you have several trays of seeds to germinate. In this way, you can maximize the wattage it takes up.

The Growerology Waterproof heat pads for plants and iPower GLHTMTL Waterproof plant heating mat are affordable choices. However, they are smaller than the first two items.

But if you only need to keep a growing temperature between 70 to degrees Fahrenheit, then these two are valuable investments.

When Should You Use a Seedling Heating Pad?

Similar to humans, we use plant heating mats to get extra heat to maintain warm temperatures. This also happens to seeds because they need water and warmth to encourage growth.

Cold temperature interrupts the germinating process. Germinating pads provide heat to keep ideal warm temperatures on a starting tray.

Likewise, they keep the soil at around 21 degrees Celsius or 70 degrees Fahrenheit. Therefore, heat mats give you a jump-start in seeding and cloning.

The normal soil temperature is usually five to 10 degrees cooler than the air temperature. Then, the water evaporates from the soil. When the air temperature increases, the soil temperature rises as well.

This is why gardeners opt to germinate indoors, especially if they don’t have the time to wait for the soil to warm up.

Furthermore, seedling heat pads give a uniform temperature. You can modify the temperature to the requirements of your needs. Having said that, you need a thermostat to regulate the heat.

Pairing Up Germinating Mats and Thermostat Controllers

Thermostat controllers aid seedling mats in providing optimal temperature, oxygen, light, and moisture. As a result, the warm soil drives the seeds to grow.

You can buy an individual thermostat, but it is wiser to opt for a heating pad with a built-in thermostat.

This is optional, but you can place collapsed cardboard boxes or Styrofoam plate under the heat mat. These additional insulation will help the mat sustain heat.

Next, put the heat pad on a wire rack or cemented surface. Don’t use wooden tables because the mats may overheat and leave burn marks.

Afterward, place the seedling pots on a plastic starting stray. Only then can you use the thermostat to check how you can control soil temperature.

In addition, thermostats let you program safety shut-offs when the germinating pad hits a temperature of 10 degrees above the room temperature.

Consequently, thermostats work best in small grow spaces because it will be more difficult for the heat pad to keep the temperature 10 degrees above a colder environment.

Make sure not to overheat the soil. If you do, the soil will run dry and cook your plants.

Product Review of the 4 Best plant heating mats with Built-In Thermostats  

For this part, I’ve compiled vital information such as features, weaknesses, and assets that will help you pick the right heat mat. Analyze and weigh such factors against your growing needs.

1: Overall Best: Vivohome Waterproof seedling heat mat with thermostat

Vivohome Waterproof Seedling Heat Mat With Thermostat

Get the ultimate temperature control and faster seed germination using the VIVOHOME Seedling Heat Mat and Digital Thermostat Controller. You can use this indoors to provide enough heat to establish healthy germination.

This model increases the heat of the soil moderately. It also provides optimum soil temperature for plants to help you germinate seeds.

The heating pad will automatically warm the rooting area 10 to 20 degree Fahrenheit over ambient temperature.

  • Weight: 1.65 pounds
  • Dimensions: 11 x 4.7 x 4.4 inches
  • Power: 18W, 120V
  • Thermostat: Keeps the temperature between 68 to 108 degrees Fahrenheit
  • Warranty: 1 year

Meanwhile, the thermostat controller improves propagation rates by keeping ideal root temperatures between 68 to 108 degrees Fahrenheit.

This control device enables gardeners to choose and maintain optimum rooting temperatures. In this way, you earn faster seedling and cutting growth.

This is one of the easiest germinating mats to use. Simply place the unit mat on a flat, dry surface. Put the seedling trays on top. Plug the cord into a standard 120V outlet.

On the other hand, the digital controller features a three-button interface for easy calibration and simple operation. The LED screen shows the current temperature whenever the SET is not activated.

Press the SET button to display the current pre-set temperature. Then, press the up or down button to adjust the temperature.

The HEATING light cycle is on when the mat is not emitting heat. The light will turn off automatically when the mat hits the pre-set temperature.

Next, press and hold the DOWN button for three seconds to show the temperature in Celsius. Press and hold the UP button to display the temperature in Fahrenheit.

The package comes with a seedling heat mat, a 1-pack digital thermostat controller, and a handy carrying bag.

The unit is fitted with a 5.8 feet long power cord and 6.4 feet long probe cord. Simply roll the mat if you need to store or pack the package.

Have that peace of mind because the heat mat complies with MET standards. Even the thermostat controller is UL certified, which supports a 1000W power load.

VIVOHOME 20W Waterproof Seedling Heat Mat for Seed Starting Propagation and Increase Germination Success 10 Inch x 20.75 Inch MET Safety Standard Certified

You can guarantee an increased growing success using the VIVOHOME Waterproof Seedling Heat Mat and Digital Thermostat Controller. Follow the manufacturer’s instructions and watch your seeds sprout healthily and quickly. This unit is for indoor gardeners who need sufficient heat to establish a warm, yet healthy growing environment.

2: Runner-Up: VIVOSUN Seedling Heat Mat and Digital Thermostat Combo

VIVOSUN 10"x20.75" Seedling Heat Mat and Digital Thermostat Combo Set MET Standard

The VIVOSUN Seedling Heat Mat and Digital Thermostat Combo Setis thebest choice for safe and professional heat-matregulation. Using its tactile buttons and clear display, you get a steady temperature, uniformed heat distribution, and superior craftsmanship.

The VIVOSUN Seedling Heat Mat and Digital Thermostat Combo Set delivers professional heating results by maintaining temperatures around 10 to 20 degrees Fahrenheit above air temperature. This warm temperature is perfect for seed starting and cutting propagation.

Aside from keeping a stable temperature, the digital thermostat has a sensor probe that gives accurate readings in both warm and cool environments.

You can use a humidity dome to help the mat get warmer. Once dew develops inside the dome, you won’t have to worry about your plants drying out.

What I like the most is the zero-effort set-up. For a gardener who has tons of things to do, a simple operation is a time-saving gift.

  • Weight: 3.7 pounds
  • Dimensions: 22.1 x 4.4 x 4.3 inches
  • Power: 20W, 120V
  • Thermostat: Keeps the temperature between 68 to 108 degrees Fahrenheit
  • Warranty: 1 year

To set your desired temperature, all you have to do is press SET once to show the current target temperature. Then, hold SET for three seconds to program a new target temperature.

Use the ‘+’ and ‘-’ to adjust the target temperature. Press SET again to confirm. Hold ‘-’ to show Celsius while ‘+’ will display Fahrenheit. See, only three buttons!

For further convenience, you can place the controller however you want from the eyelet tab. Even so, you can easily stick the thermostat probe to a terrarium or wall due to the adjustable suction cup.

Another good thing is that the outlet’s angle keeps cords from getting tangled. You can enjoy installation flexibility with the 6’5” probe cord and 5’10” power cord.

Furthermore, this unit is designed with the latest technology. It has an upgraded Alloy Nikrothal heating wire. This guarantees uniform heating and unbeatable durability.

Its multi-layer construction, with an extra layer of insulating PET film, assures that the mat won't overheat or scorch roots when left on 24 hours a day.

The high quality construction doesn’t stop there. There’s even an easy-to-grip hexagon controller made from extra-fortified plastic that won’t malfunction under harsh growing conditions.

You’ll definitely love that the seedling heat pad is ultra-durable, yet flexible and water-resistant. The unit’s functionalities follow MET standards. This is evident in the fortified connection between mat and power cord.

For safety, this germinating pad is IPX-4 water resistance. In effect, you can wipe up spills or scrub the mat clean without worry.

3: Most Budget-Friendly Option: Growerology heat mat thermostats Seed Starter Kit 

Growerology Waterproof Seedling Heat Mat for Seed Germination, Hydroponics and Plant Propagation - MET Certified Plant Heating Pad for Indoor and Outdoor Home Gardening Seed Starter Kit (10" x 20.75")

The Growerology Waterproof Seedling Heat Mat delivers better and faster results by providing improved insulation. You don’t have to worry about seed germination because the insulation components increase warmth. As a result, you nurture roots to grow into healthy plants.

The Growerology Waterproof Seedling Heat Matgrows bigger and healthier plants because it can warm the rooting area 10 to 20 degrees Fahrenheit above grow room temperature.

It accelerates seed germination by producing the ideal spot temperature. Once you’ve set the soil temperature between a steady 70 to 80 degrees Fahrenheit, you can prevent heat loss while increasing heat performance.

The insulation pad is made out of aluminum and foam. Place it under the heat mat to prevent heat loss. If you don’t use the insulation pad, the heat may transfer and get lost downward.

The good thing is that you can leave the heating pad on as long as needed. However, there is no timer nor automatic shut-off feature. But don’t worry, it is designed not to overheat.

If this is your first time to use a heating pad, then you’ll find the germination chart useful. The chart is printed exactly on the mat.

  • Weight: 0.75 pounds
  • Dimensions: 10 x 20.8 x 1 inches
  • Power: 18W, 120V
  • Thermostat: Keeps the temperature between degrees 70 to 80 degrees Fahrenheit
  • Warranty: 1 year

When I tried the product, the controller turned on the mat at 74 degrees. Afterward, the thermostat controller set it for 76 degrees. I have noticed that there’s an on and off cycle for about every 15 to 20 minutes.

As proof of durability, the MET-certified heat mat comes with a six feet power cord. Even with sturdy construction, the unit is flexible and easy to use. Not only that, this product is both CE and UL certified.

More than that, there’s an insulation piece you can put underneath the heat mat to boost efficiency. This piece prevents heat loss by reflecting the heat upwards, towards the roots.

Weighing only 0.75 pounds, this is the most lightweight and compact unit on this post. Although the downside is that you may need to rotate trays of seeds because of the small mat.

However, the bonus feature is the waterproof construction. Therefore, you don’t have to worry about misting your seeds.

The best part? You get these benefits at a cost-friendly price. In fact, this is the most affordable seedling heat pad on the market.

4: Price-To-Performance Pick: iPower GLHTMTL Durable Waterproof Seedling Mat

iPower GLHTMTL Durable Waterproof Seedling Mat 48" x 20" Warm Hydroponic Heating Pad

iPower is one the leading professional supplier of gardening tools for over 10 years. The quality components of the GLHTMTL Durable Waterproof Seedling Mat increase the success of cuttings and seedlings. This is for everyone who wants to improve germination using effective and ambient temperature.

The iPower GLHTMTL plant heating mat provides constant warm 10 to 20 degrees Fahrenheit above ambient room temperature. This is perfect for both experienced and first-time growers.

In general, you can warm up anything you place on top of the mat. This is because the maximum temperature is around 100 degrees. Yet, the heated areas will stay around 70 to 90 degrees Fahrenheit.

This germination helper increases the success of sprouting roots by gently warming the root area. You can place a humidity dome to maintain heat in the seedling heat mat.

For proper usage, place the mat on a flay, dry surface. Avoid cold surfaces because they will counteract the heating ability of the mat.

Plug the electrical cord into a standard 120V outlet. Put a propagation tray or container on the mat. Having said that, this is the low-energy solution to your propagation needs.

  • Weight: 0.75 pounds
  • Dimensions: 10 x 20.8 x 1 inches
  • Power: 18W, 120V
  • Thermostat: Keeps the temperature between degrees 70 to 80 degrees Fahrenheit
  • Warranty: 1 year

During my trial, I was able to place four seed trays. The heating mechanism works like a charm because it was able to produce uniform heat. It took me about three days to see successful sprouting.

When it comes to durability, the unit has heavy duty multi-layer construction. In effect, the model can withstand rugged indoor gardening environments.

Medium weight plastic is the material that wraps the heating components. This model also comes with a new, stronger heating wire offers more uniform heating.

Aside from that, the waterproof design enables easier cleaning and scrubbing. Finally, the entire seedling heat mat is MET-listed. Meanwhile, the cord is ETL-listed.

Even if this is direct AC powered, you can keep the unit on during the whole germination process. This is because of the automatic shut-off feature, as well as the internal insulated wiring for enhanced safety.

Since this unit is waterproof, the mat is easy to clean and store. When you are done sprouting roots, you can wipe the mat with a damp cloth. Then, roll the package and store in a dry, safe place.


What Should You Look For When Buying Seedling Heat Mats?

High quality heating pads are not expensive. However, they should have all the vital features needed to help your seeds grow. Here are the factors to consider when selecting a model.

Power

You can determine the power in wattage, which indicates how much power a heat mat can produce. Similarly, the wattage identifies how high the temperature you can control.

It is ideal to keep about 10 to 20 degrees higher than the normal room temperature. Thus, you can opt for seedling mats that have a wattage from 15 to 25.

Design and Functionality

Most germinating mats are flat with a heavy plastic cover. There are small electrical coils inside that produce heat. Thus, make sure that the unit has a cord and plug that is long enough to reach electrical outlets.

Even if heating mats use electricity, most models are waterproof. This is beneficial especially since your plants still need water to thrive.

When it comes to size, the mat should be suitable to your gardening circumstances. For instance, anything bigger than a 10” x 10” is ideal for small indoor gardens. This should hold two starting trays.

Temperature Display and Controlling Scale

The built-in thermostat must show both measurements in degrees—Celsius and Fahrenheit. This saves you time calculating the temperature.

Additionally, quality thermostats can control the temperature of the heat mat. Some models even give the option to shut the heating off when the required temperature exceeds the normal room temperature.

Question and Answer Session

Should I Turn the Germinating Pad On All the Time?

That’s the beauty of seedling heat mads—you can power them on 24 hours a day. Note that you should only do this during seed germination.

You should remove the heat pad once the seeds sprout and begin to pop out of the soul. Otherwise, the high temperature will roast the roots.

Solutions to Problems

In some cases, seeding mats emit uneven heating patterns. To avoid this, always check the temperature using the thermostat.

Increase or drop the temperature as needed. You can also cover the trays and mat using domes or a plastic bag.

To produce even heat from the mat to the tray, put some nickels on the bottom of the trays. Nickels help conduct and transmit heat. They can easily heat the areas that might remain unheated.

It’s possible to receive the heat pads rolled up inside a package. Subsequently, it will be challenging to straighten out the plastic surface.

Heat the mats in the oven for at least 30 minutes. Then, wrap the mats in tin foil. Put the mats inside the oven again for 30 minutes.

After that, take the mats out and dispatch the foil. Once the mats are warm, you can unroll them into a flat shape without curled plastic edges.

Reminders and Takeaways

  • Although most heat mats are waterproof, digital controllers are not. Hence, do not submerge the digital controller or thermostat sensor probe in very wet soil and any kind of liquid.
  • Remove the plants immediately as soon as the seeds germinate. Otherwise, the plants will grow too fast and become leggy.
  • Always follow the manufacturer’s safety instructions.

Final Thoughts…

Now that you’ve discovered the four best seedling heat pads on the market, the final decision should depend on your preferences and growing requirements.

The germinating mats on this product review all have the necessary features to maintain a constant warm temperature for your seeds.

They are paired with quality thermostats to help you modify temperature according to the needs of your plants.

Go on and give your seeds the warmth they need to fast-track your yield!

Last Updated on

>