In this guide we’ll look at the best greenhouse heaters for the UK market.
I’ve compared performance, size, build quality and cost
to give you my top recommendations.
What Are The Best Greenhouse Heaters?
More Detailed Greenhouse Heater Reviews
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Bio Green PAL 2.0/GB 2KW Palma Heater with Digital Thermostat Review
The Bio Green PAL 2.0/GB 2KW Palma Heater is the best electric greenhouse heater on the market. It’s powerful, economical and comes with a digital thermostat!
This electric greenhouse heater is compact and durable and features an IPX4 rating which means it is splash-proof.
The build quality is excellent, with a stainless steel construction, and the unit looks great too!
The heater features a handy carry handle so it is easy to move around. The heater also has a 190 cm cable, so it is easy to position in the right place.
This heater has a separate digital thermostat which can be set to temperatures from-50C to + 99C. This makes it easy to maintain the perfect temperatures for your plants.
The 2KW motor is effective at powering the fan to provide an air circulation rate of 163 m3/h. This means it creates an even temperature throughout the greenhouse with no hot or cold spots. Good air circulation is also vital to prevent mould, mildew and fungal diseases.
The heater is suitable for greenhouses and other spaces up to 39 sq. ft.
Overall, this is an effective and simple to use heater that you can just set up and leave to protect your plants over the winter. It is light and easy to carry, making it the best portable greenhouse heater that you can easily move around as required.
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2kw Electric Greenhouse Heater Review
This 2KW Electric Greenhouse Heater is robust, reliable and fantastic value for money! This heater is thermostatically controlled so will protect your greenhouse plants with no fuss.
This compact yet sturdy heater features a handy carry handle to make it easy to move around.
The heater has a 2KW motor and is thermostatically controlled so you can keep your greenhouse at just the right temperature for your plants.
The heater also includes a 3-speed fan that runs continuously to increase air circulation. The fan provides air circulation at a rate of 186 m³/hr which keeps your plants healthy and prevents the growth of mould and mildew.
This reliable and sturdy greenhouse heater offers excellent build quality and range of features, making it incredible value for money. This heater is the best small greenhouse heater in this price range – I strongly recommend!
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Biogreen WM-P5 Warmax Power4 Paraffin Heater Review
The Biogreen WM-P5 Warmax Power4 Paraffin Heater is the best paraffin greenhouse heater on the market, offering a simple yet effective way to keep your greenhouse frost free without the need to connect to the mains power!
This heater is simple to use. You simply insert the wick, fill the canister with paraffin, light it and trim the wick. It is important to trim the wick quite low to prevent smoking.
This tiny little heater will keep the average 8ft x 6ft greenhouse frost-free in the harshest weather conditions. The item has a nice traditional design, is reasonably priced and super cost-effective. 4 litres of paraffin is enough to keep it alight night and day for a week!
Overall, this is a simple product that keeps your greenhouse frost free and is ideal for use if you have no access to mains power from your garden.
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Dimplex ECOT1FT Tubular Heater Review
The Dimplex ECOT1FT Tubular Heater is compact, effective and thermostatically controlled making it the best small greenhouse heater on the market!
This heater is easily mounted onto brackets so you can keep it out the way! The mounting brackets and full instructions are included.
This heater is IPX4 rated, making it splash-proof and safe for use in the greenhouse.
The heater has low wattage and so is safe and cheap to run, yet still provides a frost-free environment for your plants!
The thermostatic control is easy to set and super accurate, so you get just the temperature you need. The heater comes with a 1.5-metre cable and a 3 pin plug.
This heater offers a safe, cost-effective and cheap to run option for keeping your greenhouse frost free this winter!
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Bright Spark Portable Gas Heater Review
The Bright Spark Portable Gas Heater is the best portable greenhouse heater on the market. It’s convenient, cost-effective and offers instant heat for the greenhouse!
This light and portable heater has a handy carry handle so can easily be moved wherever it is needed. Despite its lightness, the steel construction feels durable and long-lasting.
The heater provides instant heat and is fuelled by a butane canister. The heater features a piezo automatic ignition for easy lighting. Each canister will give up to 3 hours on full heat. The product also has an easy to use temperature control.
The Bright Spark Portable Gas Heater is a great low-cost solution to heating your greenhouse during times of freezing weather. As a portable gas heater, it’s really handy if you have no mains power in your greenhouse!
Greenhouse Heater Buyer’s Guide
Different greenhouse heaters will give out different amounts of heat. What you choose will depend on your needs. If you want to keep a standard greenhouse frost-free, then a high heat output will not be necessary. You may want to keep your greenhouse warmer than this, say 7 degrees Celsius to keep tender plants alive over winter. Again, this will not require a huge power output, but you may need more heat than a small paraffin heater can provide.
If you want to keep tropical plants or warm a conservatory during the winter months, you may need a higher output such as a 2-kilowatt heater. Many electric heaters have a variety of heating modes and a thermostat so you can set them according to your needs. Some gas heaters also offer a range of heat settings.
Most greenhouse heaters are designed to be as energy-efficient as possible. It is difficult to compare them as they use a range of fuels for power. However, to keep a greenhouse frost-free will add very little to your heating costs, regardless of whether you use electric, gas or paraffin.
A thermostat is a very handy feature on a greenhouse heater as it ensures the area remains at the exact temperature you want all the time. In addition, a thermostat ensures you don’t waste energy heating your greenhouse to a higher temperature than you need.
What size heater do you need for a greenhouse?
This question is difficult to answer as it will depend on the size of your greenhouse, the material it is made from and any insulation you have fitted. It will also depend on the temperature you want your greenhouse to be.
As a rough guide, the table below will show the power you need for different size greenhouses.
1Kw – Heat 48sq ft – Frost Protection 80sq ft
2Kw – Heat 60sq ft – Frost Protection 120sq ft
3Kw – Heat 120sq ft – Frost Protection 260sq ft
4Kw – Heat 150sq ft – Frost Protection 350sq ft
6Kw – Heat 200sq ft – Frost Protection 500sq ft
What is the best type of greenhouse heater?
The best greenhouse heater is the one that meets your requirements perfectly. This will depend on the size of your greenhouse, your access to mains electricity and the specific conditions your plants require.
If you have mains electricity, then an electric fan heater with a thermostat will be your best choice. This will ensure you can maintain your greenhouse at the right temperature over winter and increase air circulation to prevent mould, mildew and fungal diseases.
A greenhouse heater can help you make the most of your greenhouse by keeping tender plants over winter and plant new seedlings earlier in the spring.
I would recommend the Bio Green PAL 2.0/GB 2KW Palma Heater as it has a 2KW motor, a powerful fan and comes with an all-important digital thermostat.