Having a greenhouse is great, whether you love growing exotic plants in your garden, or you simply want to create an additional oasis – greenhouses enable you to step into a new world and experience scents, plants and climates that simply wouldn’t be possible in colder weather. It can also be a great transition for your conservatory plants to have a new home.

In England it can be difficult to grow particular plants, mostly because of our temperamental weather (which to our dismay, is part and parcel of being British). However, one of the most important characteristics of a greenhouse is its ability to trap in heat when the external environment becomes too cool.

They’re also good at protecting your plants for birds, eradicating the need for bird netting. In certain conditions, the greenhouse is able to trap enough sunlight for the plants to grow at an optimal rate, in others they need a helping hand.

Greenhouse heaters are there to give you an extra boost, and can pretty much save your plants, vegetables and flowers from dying after you’ve spent so much time nurturing them.

Below, we review the 6 best greenhouse heaters to help your plants grow.

We’ve also included an FAQ and a quick summary in the buyer guide to help you make the right decision.

1

Sunhouse Tubular Heater with Thermostat & Mounting Brackets

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The Sunhouse Tubular Heater with Thermostat & Mounting Brackets is a little tubular heater that will provide safe, low heat for your greenhouse allowing it to be used for an extended period of time. The heater warms up the environment quickly, coming with an inbuilt thermostat that automatically switches on and off when necessary to keep the greenhouse temperature constant. This saves you the hassle of having to manually ensure the temperature stays optimal.

It is splash-proof and fixed with an easy to adjust knob for manual temperature adjustments if required. The tubular heater designs combines function with visual aesthetics and blends in easily with your greenhouse space. It is easy to set up with just a few simple tools and totally safe around your children or pets.

At 80 watts, the energy consumption is low, and the accompanying wall mounting brackets mean assembly is relatively simple. 

This is ideal if you’re looking for something that won’t break the bank, but still gives you the boost that you’re looking for.

Key Features:

Simple plug-in heater

Built in thermostat for temperature control

Specification:

Brand

Sunhouse

Weight

880 g

Dimensions

7 x 9.5 x 83 cm

Wattage

80 w

Pros

Quick and simple to get started. Included brackets a nice touch

No exposed parts meaning it safe around children

The consistent temperature control means there is little maintenance required

Cons

Not effective for large-scale greenhouse areas

2

Hylite Slimline Eco Heater with built in Thermostat

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The first Hylite product on this list is another slimline heater that also falls into the easy-to-use category. The Hylite Slimline Eco Heater with built in Thermostat is designed as a high quality, seamless tube solution with a white enamel finish that is easy to clean and looks great wherever you fix it. It also has that greenhouse ‘look and feel’. 

It is both an affordable and efficient solution, with a 55 watt capacity and an inbuilt thermostat. This automatically switches on and off to regulate the temperature of your greenhouse, ensuring that it maintains pre-set optimal conditions in place without getting too hot or too cold. It also helps on energy saving, helping to keep those bill payments down.

It is splash proof and water resistant, ensuring it is not a safety hazard to children or pets. The attached brackets ensure it can be fixed easily to the wall, but they also come with rubber feet to facilitate its placement on the floor. It also has a one and a half meter cord.

This is ideal for someone who is looking for a quick little boost, as the wattage caters to smaller greenhouses too.

Key Features:

Built in thermostat that regulates temperature

Attached wall brackets

Rubber feet

IP44 splash rating

Specification:

Brand

Hylite

Weight

953 g

Dimensions

50 x 4 x 8 cm

Wattage

55 w

Pros

Energy saving solution

Thermostat regulates temperature meaning little maintenance

Plug-and-play solution

Cons

Not effective in large spaces

3

LightHouse Eco Heat Greenhouse Heater

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Designed specifically for greenhouses, the LightHouse Eco Heat Greenhouse Heater guards against sudden fluctuations in temperature and humidity. It consumes less than 50w of power per foot which is about the same rate as a regular light bulb and 25% less than a lot of similar products. 

It’s built to keep the temperature stable in the autumn and winter months at a relatively low rate.

Available in multiple wattages of 45w, 80w and 135w, it can be mounted on the wall or attached to soil beds, heating up your soil environment and the seedling root ensuring a stable environment for optimum growth. We also like the green colour it comes in, blending perfectly with the plants and bringing a more visually appealing heater to your greenhouse. 

This lighthouse Eco Heater is an easy plug-to-use product  and it does not need too many special equipments to set up. The failures of this nice heater include the fact that It does not work well for large spaces and its durability is questionable

With varying wattage, you can really be flexible with this product and find one that works just for you – which is ideal.

Key Features:

Built-in temperature control thermostat

IP44 splash rating

Specification:

Brand

LightHouse

Weight

1.66 kg

Dimensions

915 mm

Wattage

915 w

Pros

Energy saving solution helps to keep costs down

Temperature remains constant through all seasons

Green colour blends in with greenhouse plants

Cons

Only suitable for smaller space

4

Hausen Electric Tubular Heater

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The Hausen Electric Tubular Heater for greenhouses is produced by a brand that specializes in home and leisure products, assuring you of its durability. Affordable, splash proof and power saving, the electric heater provides a constant, stable environment for your greenhouse plants, seedlings and cuttings.

It is compact and well sealed, preventing your environment from frost, damp and condensation. It is available in several tube lengths and wattages, with 90°c and 130°c thermal protectors, so you can choose your model depending on the size of the greenhouse or space of intended use.

It comes with a 1.5 metre cable, fixings, mounting brackets and two thermal protectors of different degrees.  The only thing to be conscious of is that there may be a bit of smoke when you first use it, but this is not to worry about as it stops after usage for some time.

Key Features:

90°c and 130°c thermal protectors

Low power consumption

IP55 waterproof rating

Specification:

Brand

Hausen

Weight

1.6 kg

Dimensions

915 mm

Wattage

120 w

Pros

Multi-purpose solution that can heat more than just a greenhouse

Durable and efficient solution that ensures a consistent temperature even if there are sudden fluctuations in temperature

Well sealed and compact

Cons

Not ideal for damp spaces

5

Simplicity Heater Set - Greenhouse Fan Heater + Digital Thermometer

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Though it is our only heavy-duty heater on this list, you can be sure of the Simplicity Heater Set’s reliability in that it’ll heat your greenhouse well and to the desired temperature. Although recently brought to market, it uses old fan models to create a reliable mix of the old and new fan heater.

This heater is ideal for use in larger greenhouses, keeping your plants frost free and well above the temperature outside. It also works well for other spaces and outbuildings.

Its tough metal exterior means that it can be used in multiple capacities. The coil and fan can be used to target air in several directions, ensuring an even distribution of heat.

It is IPX4 rated ensuring that it complies with the most rigorous of safety standards. This heater can also double up as a fan during summer and comes with a 1kw and 2kw heat setting. 

The heater comes with a thermostat in the form of a remote control that shuts off the fan when the optimal temperature is reached, meaning little need for constant manual checking. The notable standout is that it can reach higher temperatures compared to other tubular heaters listed. This product is durable, well sealed, easy to use and can be used all year round.

The only consideration with this model is that the coil does not cool down so quickly after the right temperature has been achieved.

Key Features:

Coil-and-fan unit

Digital thermostat

IPX4 splash rating

Heavy duty metal casing

Specification:

Brand

Simplicity

Weight

953 g

Dimensions

230 x 198 x 320 cm

Wattage

2 kW

Pros

A heavy-duty fan, ideal for covering larger greenhouse areas

Digital thermometer turns off when correct temperature is reached

High splash rating

Cons

Coil takes a while to cool down

6

Hylite Tubular Heater

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Small, compact and easy to use, the energy efficient Hylite Tubular Heater consumes just 120 watts of power, low compared to most available heaters on the market. Since the power consumed is only about that of two bulbs, you should manage your expectations of what to expect in terms of output, though it is still a very reliable heater for a modestly sized greenhouse.

Though small, you can be sure that the temperature of your flowerbed wont drop to harmful levels and that your tomatoes, chillies, lime, seedlings or cuttings will survive winter. It is a heater that is best suited to small, confined areas.

It is splash-proof and comes with easy to set up mounting brackets. It also comes with an inbuilt thermostat and, although there is no marking on it, you can gradually increase the temperature till you feel it is at its optimal.

Key Features:

Inbuilt thermostat for temperature control

Compact tubular design

Comes with mounting brackets

Specification:

Brand

Hylite

Weight

950 g

Dimensions

1 metre

Wattage

120 w

Pros

Energy saving heater that keeps costs down

Ideal for small, confined spaces

Reliable and easy to use

Cons

Not effective for large spaces

Summary

You’ll see from the above products that there are so many great options to choose from, so if you’ve landed here – you’re probably not completely sure which heater is the best for you. It’s common when you’ve never bought a product before to be apprehensive, so we’ve listed a few things for you to consider below before making your purchase! Remember that a lot of the time it’s down to personal preference and what works for you, as well as the plants that you already have in your greenhouse.

Size

Size definitely does matter when picking a heater, and we don’t mean the wattage. We mean the physical size of the heater. It’s important to think about this especially if you have a really small greenhouse or a large one. You want to find one that works efficiently in the space that it has. This doesn’t actually have a direct correlation to wattage

Type of plants you’re growing

It’s important to consider the type of plants or vegetables that you’re growing, as this will influence firstly whether you need a greenhouse heater, and secondly, which one is the best for you. If this is your first time filling a greenhouse with plants and vegetables, make sure you do thorough research on the optimum temperatures and climates for them, and get a second opinion if you’re a beginner. The last thing you want to do is accidentally buy the wrong heater and misjudge the climate, which will then leave you without any plants. Also, if you’re looking to move your conservatory plants into a greenhouse, check what their temperatures are too.

Wattage/heat

Although this sounds obvious, make sure that you check the wattage before purchasing. Similar to the type of plants you’re growing, your heater will be pretty much redundant if you accidentally buy the wrong wattage. Remember, it’s easier to warm up a greenhouse than cool it down, so you’re always better off buying a smaller heater with less wattage and building up the heat (if necessary), than buying one that completely exceeds the climate that you’d be looking for in the first place.

FAQ

What do greenhouse heaters do in the winter?

In conditions where the temperature is lower or during winter seasons when there is barely enough sun, the sunlight trapped is not enough to keep the greenhouse plants growing in optimal conditions. To sustain the greenhouse plants, a source of artificial heat from a greenhouse heater is often required. This works differently than if you were growing plants outside or caring for a lawn, requiring the correct fertilizer and a robust lawn spreader to ensure even distribution of the lawn food.

What are the other artificial sources of light available?

There are several possible artificial sources of heat for a greenhouse, including heating coils, fans, natural or bottled gas, electric and solar greenhouse heaters, some of which work very well with thermostats to regulate the temperature of the greenhouse. It’s also smart to invest in a weed killer (or a best moss killer if this is what is the issue) and ensure that the area around your greenhouse is well-kept.

What do greenhouse heaters actually do?

The heaters keep a greenhouse at optimal temperature for the livestock to grow, working especially well if you live in a place with a relatively low temperature all year. These work differently to a conservatory heater, which can have the temperature amended depending on requirements.

Are greenhouse heaters safe?

Of course they are. Providing that you have bought the correct sizing and wattage, and you make sure that you regularly check it for any glitches/dirt/wear and tear then it is completely safe. Of course, you shouldn’t allow young children near greenhouse heaters, but overall these are completely safe and should last you a long time – particularly as they aren’t exposed to the elements.

What plants and vegetables work best in greenhouses?

These work well in warmer temperatures (with a heater):

  • Cucumbers, Tomatoes, Peppers, Squash
  • Orchids, Venus Flytraps, Cacti
  • Ferns, Pansies, Gazanias

These work in colder temperatures (without a heater)

  • Lettuce, Broccoli, Peas, Carrots
  • Thyme, Mint, Basil
  • Crocus, Niger, Snowdrop

Of course, there’s an extensive list that can be attributed to both colder and warmer temperatures, however we hope these give you some inspiration!