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3 Best Heated Electric Propagators to Promote Early Germination! (2021 Review)

In this guide we’ll take a look at the best heated electric propagators for the UK market.
I’ve compared design, size, energy efficiency and cost
to give you my top recommendations.

What is the Best Heated Electric Propagator?

In a rush? Here's my top choice...

Garland Super 7 Electric Heated Windowsill Propagator

Efficient and well-designed propagator for seedlings!

This Garland Super 7 Electric Heated Windowsill Propagator features 7 individual growing cells so you can grow different seedlings at the same time. It measures 76 x 18.5 x 15 cm, easily fitting on a window ledge, and heats evenly across the base thanks to a 13 W carbon-fibre heating element.

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Everything I Recommend

IMAGE RECOMMENDED PRODUCTSPRODUCT FEATURES
  • Sturdy and attractive design
  • Fits perfectly on windowsill
  • Best heated electric propagator
  • Economical 22 W heater
  • Adjustable ventilation panels
  • Fits pots up to 1 L
  • 18 W heater
  • Adjustable air vents
  • Roomy and versatile

More Detailed Electric Propagator Reviews

Garland Super 7 Electric Heated Windowsill Propagator

FEATURES RATING PRICE
FEATURES
  • Sturdy and attractive design
  • Fits perfectly on windowsill
  • Best heated electric propagator
OUR RATING
97
PRICE
CHECK PRICE →

Garland Super 7 Electric Heated Windowsill Propagator Review

This Garland Super 7 Electric Heated Windowsill Propagator is a sturdy and attractive heated propagator that fits nicely on a windowsill.

The kit consists of an attractive green and white tray made of durable, rigid plastic. On top of this sit seven ‘cells’ topped with clear, shatter-resistant lids with adjustable vent openings.

The overall size of the electric propagator is 76 x 18.5 x 15 cm so you won’t have any trouble fitting it on your window ledge.

It features a 13 W carbon-fibre heating element that evenly distributes heat across the base. Thanks to the design of separate ‘growing pods’ you can grow a range of different seedlings at the same time. Plus, you can easily remove the pods from the heated base once they have germinated to prevent leggy growth.

The separate cells also allow you to ventilate different varieties as required.

It comes with a lead and plug. From my experience, the lead is slightly on the short side; however, this is easily fixed with an extension lead.

This is a really attractive electric propagator that is practical and versatile. It is well made and durable and offers excellent value for money.

In my opinion it’s the best heated electric propagator available in the UK!

Pros

  • Simple to use - just plug it in and turn it on
  • Highly effective when it comes to starting seedling growth
  • A good size for most window sills, with a slimline design
  • The individual trays and lids make it easy to plant a range of seeds

Cons

  • Although simple to use, there are no controls and the heat is only increased by 8°C - so this propagator still needs to be kept inside on a warm windowsill
  • Does not appear to work for all seed types, especially those that require warmer temperatures
  • The plastic construction isn’t particularly durable and needs to be handled with care
  • There is no indicator light so it’s easy to accidentally leave it on

Stewart Essentials Electric Propagator

FEATURES RATING PRICE
FEATURES
  • Economical 22 W heater
  • Adjustable ventilation panels
  • Fits pots up to 1 L
OUR RATING
94
PRICE
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Stewart Essentials Electric Propagator Review

This Stewart Essentials Electric Propagator is a large electric propagator with a nice tall lid that allows you to grow larger plants and cuttings with ease.

The set consists of a simple heated tray with a ventilated plastic lid.

The simple design makes this a versatile electric propagator as you can use whatever size trays and pots you require (you’re not restricted by smaller ‘cells’).

The base will hold pots up to one litre in size and the overall dimensions of the unit are 52 x 42.5 x 28 cm. The unit has a 22 W heater to maintain a nice even temperature during the germination process. There are also two adjustable vents in the roof allowing you to further control the environment of the seedlings.

This is a versatile and reasonably priced electric propagator that will allow you to grow a range of seeds and cuttings, and you’re not restricted by pot size.

Pros

  • Has a lot of internal space for seeds
  • The adjustable ventilation panels offer relatively easy temperature and humidity control
  • Most users find this propagator highly effective when it comes to helping their seedlings germinate
  • Simple to use with easily adjustable air vents

Cons

  • Many customers have commented that the plastic lid is flimy compared to the rest of the parts and needs to be handled with care
  • The cable is fairly short so this propagator will need to be placed near a plug socket
  • Cannot be set to a certain temperature so it is still reliant on the temperature outside
  • With a square design, this propagator won't fit on many windowsills

Sankey Growarm 300 Electric Propagator

FEATURES RATING PRICE
FEATURES
  • 18 W heater
  • Adjustable air vents
  • Roomy and versatile
OUR RATING
90
PRICE
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Sankey Growarm 300 Electric Propagator Review

This Sankey Growarm 300 Electric Propagator comes with one large and two small seed trays. You also receive 5 x 9 cm flower pots which can be used instead of the trays. Other small pots in the base if you wish.

The electric propagator is made of reasonably sturdy plastic and the clear plastic lid has two adjustable air vents.

The 24 cm height of this propagator will allow for growth, and also mean it is roomy enough for small cuttings. The moisture mat helps keep up the humidity in the unit, therefore meaning less watering is required and your precious seedlings are less likely to dry out.

The base has and 18 W element to provide warmth and the vented lid allows you to control heat and humidity. The overall size of the unit is 26 x 42 x 52 cm.

It comes with a 3 m cable and 13 amp fitted plug.

This electric propagator is roomy and versatile and the addition of the capillary moisture mat means there is less chance of seedlings drying out.

Pros

  • Comes with 1 large and 2 small seed trays included
  • Most users find their seeds germinate even in very cold weather
  • Very effective, with most seeds germinating in a couple of days
  • It is easy to operate the vents, and these do offer some temperature and humidity control

Cons

  • The temperature it reaches depends on the room temperature and cannot be controlled independently
  • There is no indicator light so some users find they leave it on for longer than they meant to
  • Some customers commented that the construction is a little flimsy
  • As this propagator is fairly large, finding a location for it may be difficult

Things to Know Before Buying a Heated Electric Propagator

Getting your seeds off to a great start in life is easy with a heated electric propagator.

Whether you are looking to germinate seeds early, or struggling to get them to thrive, a heated propagator can provide the perfect home for your young plants.

Heated propagators create an ambient warmth that’s just a few degrees above air temperature, helping certain seeds to germinate. The best part is that they cost just a few pennies a day to run.

If you’re considering purchasing a heated electric propagator but you’re not sure where to start, the following tips will help you make an informed decision.

The size of the propagator is important; you should ideally be able to fit it on your windowsill or in your greenhouse.

Take a look at the product’s dimensions and match them up with the space you have available – propagators come in a range of sizes, so you’ll find one to fit your space with a bit of searching!

Having an idea about the length of the product’s cable before purchasing is also a good plan. Some propagators have cables of 1 m, whilst others have longer ones. Depending on where you have a power outlet, either in the house or greenhouse, you may have to use an extension cable.

Propagators can also vary in their capacity, and whether their capacity is spread between one or more sections. A propagator that can hold around 1 L will be suitable for most home use.

The lid height will dictate how long you can keep your produce growing in the propagator – if the plants start pushing the ceiling they’ll have to be taken out. If you need your seeds to grow a little taller, look for a container with a taller lid height.

Of course, if you’re only looking for your seeds to germinate and then plan on replanting them straight away, the height won’t matter so much.

The number of compartments will allow you to grow several types of different types of seeds; you can adjust the soil type and environment to suit the individual seed.

Most standard propagators either come with on large seed tray, or one larger tray and a few separate smaller trays. These may be contained under the same roof, or in individual ‘pods’.

Individual pods can really help you go further customise the environment for each seed.

For example, the Garland Super 7 Electric Heated Windowsill Propagator has seven different pods and each one has its own ventilation. These type of set up allows you to keep some seeds cooler than others, all on the same propagator.

The idea of adding a propagator to your house might seem daunting – doesn’t it cost a lot of money to have a heat source on for a long time?

Electric propagators can range in wattage, and the size of the propagator will also affect how much power you need. The wattage will determine the price to run it.

Generally, you want to be keeping the temperature of the soil inside the propagator at around 10 – 15°C depending on the seed.

You can buy propagators that range anywhere from 8 – 100 W. You can easily work out how much money each wattage propagator will cost you:

First, you will need to know how much your energy provider charges per kilowatt-hour. Let’s say they charge 14p per kWh.

If you run a propagator of 100 W for an hour, at this rate, it will cost you 1.4p for that hour. A propagator of 50 W will cost 0.7p for an hour, and so on.

As you can see, at these low wattages, keeping a propagator running is quite affordable.

Plus, if you get a propagator with a thermostat, it will regulate the temperature and save energy by turning off when it reaches that temperature.

Heated Electric Propagator FAQs

Most seeds germinate more effectively with some base heat. However, a heated propagator is particularly useful for plants that are usually grown in warmer climates as these generally need warmer temperatures to germinate. If you are planning to grow tomatoes, chillies, peppers, aubergines, cucumber or melons then an electric propagator will be a worthwhile investment. Heated propagators are also useful for seeds which require a long growing season as they enable you to get a head start and make the most of warm summer days.

An electric propagator is very simple to use. Once you have planted your seeds in the trays or pots and watered them, simply put them in and turn it on. You will probably not notice a great deal of warmth in the unit, however, you will see some condensation that will show you the unit is doing its job. If your unit has a capillary mat, then wet this under the tap and put it at in the base before putting your seeds in.

You can adjust the ventilation in your electric propagator as necessary but bear in mind that the unit will dry out more quickly when the vents are open. Once the seeds have germinated and are beginning to grow, you can either remove them from the propagator or just unplug the unit if all the seeds have germinated. You can also increase the ventilation at this stage to gradually acclimatise the seedlings.

Place your propagator somewhere warm and sunny, but ideally away from direct sunlight. A sunny windowsill tends to be the best option.

Remember to turn your propagator regularly, to encourage your seedlings to grow straight up and not bend towards the sunlight.

Sources
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