The best greenhouse heaters, compared.
Top pick: AC Infinity THERMOFORGE S7 Best value: Hylite 300 mm 28 W tube – 28 W at a stated 230 V, about £23.49, with IP44 claimed and 4.1 from 2,276 reviews, for a small volume. Updated October 2026.
A greenhouse heater on amazon.co.uk is usually a low-watt electric tube for background frost protection, sometimes a fan or small convector, and sometimes a paraffin wick heater where you have no socket. You are trying to keep plants just above freezing, or a little warmer, in a damp house on a nominal 230 V supply with a BS 1363 plug. The useful checks are a stated thermostat that is not only an overheat cut-out, a voltage of 230 V or 240 V, and an IP claim you can read. The [greenhouse heater buying guide](/hub/raised-beds-greenhouses-and-compost/greenhouse-heater/sub/greenhouse-heater-buying-guide) sets the socket, the degrees and the watts before the model. A greenhouse heater is a device from amazon.co.uk meant to take the chill off a damp house. A fan or a small convector is the higher-output option that moves air.
A greenhouse heater on amazon.co.uk is usually a low-watt electric tube for background frost protection, sometimes a fan or small convector, and sometimes a paraffin wick heater where you have no socket.
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Personal buying guide
Question 1 of 2
What job are you heating for?
The AC Infinity THERMOFORGE S7 is a 1,000 W PTC heater at £89.99, with 10 heat levels, overheat protection and tip-over alarms, sized at 22 × 17.8 × 26.4 cm and 2.38 kg. The specification block states 120 V and 8.33 A, which does not match a UK 230 V socket. Ducting is not in the box, and Wi-Fi needs a separate UIS controller. The stored review headers are 33 from the United States and one from Canada, so they are not United Kingdom experience. Rank 19 in Greenhouse Heaters does not change the voltage. A 120 V listing is a reason to stop before you treat the 4.4 stars from 46 reviews as a UK greenhouse result.
Pros
Cons
Best for: A 120 V grow-tent setup where that voltage is the supply you already have.
Less suitable: A UK greenhouse on a BS 1363 socket.
Specifications
Common questions
What voltage does the specification block state?
120 V AC and 8.33 A.
Does the box include ducting?
No. The bullet says ducting is not included.
Are the stored reviews from the United Kingdom?
No. The file has 33 United States headers and 1 Canada header.
The Airmaster FW400 is a 520 W floor convector at £25.94, stated as 240 V and 2.17 A, with a thermostat band of 5–30°C and coverage up to 10 m². That degree band is the only printed set point in this set that is not only an overheat cut-out. The unit is 35 × 17.5 × 35 cm and 1.11 kg, with no IP rating and no timer in the specification block. One UK review used it for a night in a 6 × 8 when it was near freezing outside; other reviews are bedrooms and a laundry, and the lamp is called distracting. Another review says the booklet limits it to well insulated spaces or occasional use, which is that reviewer's report of the booklet, not a lab test. At 4.3 from 173 reviews it is the listing that matches a UK voltage and a stated frost-to-warm dial, though 520 W is still not the Two Wests figure for an uninsulated 6 × 8. Full output is about 13.7 pence an hour at 26.32 p/kWh, which is one hour of arithmetic, not a bill.
Pros
Cons
Best for: A greenhouse with a sound 240 V socket where you want a dial from 5°C and can keep the heater dry.
Less suitable: An uninsulated 6 × 8 ft house sized from a retailer watt table, or a wet house with no IP claim.
Specifications
Common questions
What thermostat range is stated?
Minimum 5°C and maximum 30°C.
Does it have a timer?
The listing FAQ asks. No timer is in the specification block.
Is an IP rating stated?
No. Indoor and floor standing are stated. One review quotes a booklet limit to well insulated spaces or occasional use.
The AAOBOSI is a 2,000 W floor fan heater at £119.99, with a stated 5–42°C band, a Smart Life app on 2.4 GHz, a remote and a 7-day timer. The file gives no mains voltage, so a BS 1363 socket is not confirmed by the specification block. Stored UK reviews describe gyms, rooms, garages and workshops more often than a greenhouse, and some say the heat will not stay mild or that the unit does not switch off at the set point. Buttons are called fiddly, and one unit was dead on arrival. The bullet claims a shutdown at 75°C and a 2 m lead, on a unit that is 23 × 26.5 × 21 cm and 2.9 kg. Full output is about 53 pence an hour at Ofgem's 26.32 p/kWh rate for 1 October to 31 December 2026, which is arithmetic for one hour, not a winter bill. It sits in Electric Heating in this capture, not in Greenhouse Heaters.
Pros
Cons
Best for: A dry indoor space where you want app scheduling and can confirm the voltage on the unit.
Less suitable: A damp greenhouse on a UK socket when the listing never states 230 V or 240 V.
Specifications
Common questions
What thermostat range does the listing state?
The item highlight states 5–42°C. The bullet says the external probe holds that band to ±2°C.
Does the listing state the mains voltage?
No. The specification block has no voltage line.
Can it be controlled from an app?
The bullets name the Smart Life app on 2.4 GHz Wi-Fi, plus a wireless remote, a wired panel and buttons on the unit.
The SISUPASSIE is a ceramic fan heater at £49.99 whose bullets name fan-only, 1,500 W and 3,000 W modes, a 1.3 m lead and a self-resetting thermal breaker. The specification block has no voltage, no IP rating, no dimensions and no degree range. It ranks 6 in Patio Heaters and 3,142 in Garden, not in Greenhouse Heaters. Twenty-two of the review blocks are United Kingdom, and they describe rooms and a garage. One buyer used it in a greenhouse because it switches off when hot, and another calls it a compact 2,000 W unit, so the review pool mixes wattage claims. One review says it ran cooler than a 2,000 W heater and that the dial is on or off. The "200 square feet in 3 seconds" line is a bullet, not a measured greenhouse trial.
Pros
Cons
Best for: A short burst of fan heat in a dry room, if the rating plate shows a UK voltage.
Less suitable: Frost protection in a damp greenhouse when voltage and a degree band are missing.
Specifications
Common questions
What heat settings does the listing state?
The bullets name three modes: fan only, 1500 W and 3000 W.
Is a mains voltage printed?
No. The specification block has no voltage or amperage line.
Where is it ranked?
3,142 in Garden and 6 in Patio Heaters. It is not ranked in Greenhouse Heaters in this file.
The Hylite HHT203 is a 300 mm, 28 W tube at £23.49, stated as 230 V and 0.12 A, with a claimed IP44 rating, a claimed thermostat and a 1.5 m cable and plug. The specification block prints no degree scale, and UK reviews call the thermostat crude. In the first 50 United Kingdom reviews, one buyer found a 3 A fuse and another still found a 13 A fuse; a review that says to fit 3 A is not the maker's instruction, because the listing states no fuse. Uses in those reviews include greenhouse damp, a wardrobe, kennels, a boat and a kitchen, and one review is about a 500 mm 55 W Hylite, so lengths are mixed. It ranks 2 in Greenhouse Heaters, which is a sales rank, not a test that 28 W heats a 6 × 8 ft house. At 4.1 from 2,276 reviews and about 0.7 pence an hour at full output on 26.32 p/kWh, it is the low-cost background tube in this set for a small volume. The body is 4 × 30 × 4 cm and 0.59 kg, for wall or floor as the bullet states.
Pros
Cons
Best for: Background warmth and damp control in a small greenhouse, cupboard or similar volume on 230 V.
Less suitable: A 6 × 8 ft house in a cold snap, or anyone who needs a printed degree scale.
Specifications
Common questions
What IP rating is claimed?
The bullet says IP44. That is a splash claim in the text, not a photographed rating plate.
Does it have a timer?
The listing FAQ asks. No timer is in the specification block.
What do reviews say about the fuse?
In the first 50 United Kingdom reviews, one buyer found a 3 A fuse and another still found a 13 A fuse.
The Morris is a 2 ft, 120 W tube at £29.99, stated as 240 V and 0.5 A, with a coverage field of 4 m² and brackets you slide together, screw in and clip. The bullet's IP55 claim, including the word waterproof, is a limited-dust and low-pressure-jet description in buyer notes on BS EN 60529, not a heater you may hose. The "90° thermostat cut out" and the 90 degrees Fahrenheit field are an overheat device; a UK review says there is no temperature dial. The bar is 5 × 60 × 5 cm and 1.08 kg. Reviews mention a car on an extension lead, cupboards, a boat, two failures inside a year, and one line that a small or medium greenhouse is a fair use. At 4.1 from 500 reviews and rank 3 in Greenhouse Heaters, 120 W is still far under a 420 W frost example for a wrapped 6 × 8. Full output is about 3.2 pence an hour at 26.32 p/kWh.
Pros
Cons
Best for: A small or medium house on 240 V where you want a low-watt tube and will add your own thermostat or thermometer.
Less suitable: Anyone who reads IP55 as waterproof, or who needs a settable frost temperature.
Specifications
Common questions
Does it have a thermostat you can set?
The bullet describes a 90° cut-out. The spec field says 90 degrees Fahrenheit. Reviews say there is no temperature dial.
What IP rating is claimed?
IP55, in the bullet and in special features, which also say waterproof (IP55).
What is in the box?
Mounting brackets. The bullet says you slide them together, screw them in and clip the tube.
The Hylite HHT210 is a 1,000 mm, 120 W tube at £33.95, with IP44 and a thermostat claimed in the bullets and a 1.5 m cable and plug. This file has no voltage or amperage line, so do not copy the 230 V figure from the 300 mm Hylite. United Kingdom reviews say the set point is trial and error because there is no scale, and they mention a conservatory, a greenhouse on frosty nights, a garage, a porch, a camper and condensation. One first unit tripped a fuse. One review says it was not quite enough on its own for an insulated 6 × 8 in a cold snap, so a fan heater still ran. It weighs 0.6 kg, with no dimensions in the spec block, and this capture has no Greenhouse Heaters rank. At 4.1 from 390 reviews it is a longer background tube than the 28 W bar, and the missing voltage is the first thing to check on the rating plate.
Pros
Cons
Best for: A longer run of background heat along staging, once the rating plate shows a UK voltage.
Less suitable: A cold-snap 6 × 8 on its own, or a buyer who needs the voltage printed before ordering.
Specifications
Common questions
Is the mains voltage stated?
No. This file has no voltage or amperage line.
Does the thermostat have a temperature scale?
Not in the specification block. United Kingdom reviews say the set point is trial and error because there is no scale.
What did a greenhouse review say about a 6x8?
One review says it was not quite enough on its own for an insulated 6x8 in a cold snap, so a fan heater still ran.
The LightHouse Eco Heat is a 305 mm floor tube at £22.99, stated as 230 V and 0.22 A, weighing 0.74 kg. The title says 45 W and the heat-output field says 50 W, so both figures stay in the same file. There is no thermostat line, and the coverage field prints 8.611129 with no unit, which is not a size you can plan from. UK reviews include a tent held near 6°C when it was 0°C outside, a shed checked with a separate thermometer, a cupboard, smoke on first plug-in that then cleared, and a review that it did not heat. Rank 7 in Greenhouse Heaters and 4.0 from 495 reviews do not turn 45–50 W into the watt sum for a 6 × 8 ft house. Wall mounting is asked in the listing FAQ and not answered; the spec block says floor.
Pros
Cons
Best for: A small tent, cupboard or shed where 45–50 W and 230 V are enough to take the chill off.
Less suitable: A 6 × 8 ft house that needs a thermostat and a much higher watt figure.
Specifications
Common questions
Does the listing state a thermostat?
No. The listing FAQ asks, and the specification block has no thermostat line.
Why do the watts not match?
The title says 45 W. The heat-output field says 50 W. Both figures are in the same file.
Can it be wall mounted, according to the spec block?
Mounting type is floor. Wall mounting is asked in the listing FAQ and not answered.
The Trendi is a paraffin wick heater at £18.95 with a 4.5 litre tank, a twin wick and a bullet claim of up to 80 hours from one filling of premium paraffin. Fuel is not listed as included, and there is no thermostat. The heat-output field prints 4,500 W and the coverage field prints 0.0307 m²; neither is a measured size for a greenhouse, and the bullet's "up to a 6 × 8" should not be read as that watt figure. The unit is about 30 × 30 × 40 cm and 1.95 kg, and it is a tabletop heater. UK reviews call it larger than expected and use it for frost, and they also mention poor screws, nuts off the chimney, a burner that did not sit firmly on the tank, and smoke when the wick is high. Soot on plants appears in a UK review of this ASIN. At 3.7 from 577 reviews it is the only no-socket heater in the set, and it still needs a vent because paraffin adds water and carbon monoxide.
Pros
Cons
Best for: A greenhouse with no socket, for H2 or hardier plants, with a vent left open.
Less suitable: Any site that already has a sound 230 V or 240 V socket, or orchids and cacti.
Specifications
Common questions
What fuel does it take?
Premium paraffin. The bullet states a 4.5 litre tank and up to 80 hours from one filling. Fuel is not listed as included.
Is there a thermostat?
No thermostat line is in the file.
What does the 4500 W field mean?
It is the heat-output line in the spec block. The same file's bullets describe a 4.5 litre paraffin tank, not a measured watt test.
Nine heaters are on this page. The number on each card is the amazon.co.uk star rating times 20, which is how the display file scores them: 4.4 becomes 88 and 3.7 becomes 74. There is no laboratory test. The top pick and the best value are the awards already on that file. Voltage, a thermostat you can set, watts after insulation, an IP claim and price are how the notes were written. They do not replace the star score. A 120 V specification and a 4,500 W paraffin field stay on the card as conflicts, not as UK results.
Voltage and plug
25%A stated 230 V or 240 V is the first filter. A 120 V line, or no voltage at all, is a reason to stop before you read the stars.
Thermostat
25%A printed degree band, such as 5–30°C, is a set point. An overheat cut-out, or a dial with no scale, is not the same control.
Watts after insulation
20%A retailer watt example for a 6 × 8 ft house is far above a 28 W or 45–50 W tube. Rank in Greenhouse Heaters does not change that sum.
Damp and IP claim
15%IP44 is a splash claim and IP55 is limited dust and low-pressure jets, from buyer notes on BS EN 60529. Silence on IP stays silence.
Price after the job fits
15%Shelf price is compared only after voltage, degrees and watts match the house. Pence per hour at 26.32 p/kWh is one hour of arithmetic, not a winter bill.
Name the socket and the temperature before you compare stars. A low-watt tube, a fan or convector, and a paraffin wick heater are different purchases. Prices on this page are amazon.co.uk shelf prices, from about £18.95 to about £119.99. The card score is the star rating times 20. That is not a laboratory test.
A greenhouse heater in this comparison is a device from amazon.co.uk meant to take the chill off a damp house. The usual shape is a low-watt electric tube for background frost protection. A fan or a small convector is the higher-output option that moves air. A paraffin wick heater is the option when you have no socket. The Royal Horticultural Society treats fans as the higher-output choice that moves air, tubes as the lower-energy frost tool, and says a fan should be one sold for greenhouses.
The Trendi heat-output field prints 4,500 W. The same listing describes a 4.5 litre paraffin tank. That watt line was not measured. The bullet's claim of up to a 6 × 8 is not that figure either.
The Morris 90° line is overheat protection. UK reviews say there is no temperature dial. Hylite bullets say a thermostat, and reviews say the dial has no scale. The Airmaster 5–30°C band is the printed set point in this set.
The Hylite 300 mm tube ranks 2 in Greenhouse Heaters. That is a sales rank. 28 W is not the Two Wests frost example for a 6 × 8 ft house, insulated or not. Use it for a small volume and check the night with a thermometer.
Voltage decides whether the heater belongs on a UK socket. You want a stated 230 V or 240 V and a BS 1363 plug. Regulation 35 of the Electrical Equipment (Safety) Regulations 2016 expects a correctly fitted BS 1363 plug, or a converted plug with a BS 1362 fuse to the maker's instructions. The Airmaster states 240 V, the Hylite 300 mm states 230 V, the Morris states 240 V, and the LightHouse states 230 V. The AC Infinity specification block states 120 V and 8.33 A.
Watts only make sense after you know the glass and the insulation. Two Wests gives about 936 W for an insulated 6 × 8 ft house and about 1,170 W if it is not insulated, for frost. Heathfield LED uses about 6.25 W per square metre of glass per degree, and about 30 per cent less with bubble wrap. The RHS wants bubble wrap and a max-min thermometer. A 28 W Hylite or a 120 W tube is background heat for a small volume. The Airmaster at 520 W is still under that uninsulated example.
Three typical situations, each with a recommendation from this comparison.
You have a sound 240 V socket and you want a dial that states degrees, not only an overheat cut-out. The Airmaster FW400 is the top pick: 520 W, a stated 5–30°C band and coverage up to 10 m². It has no IP rating in the listing, so you keep it dry.
You want background warmth and damp control in a small greenhouse, cupboard or similar space on 230 V, and you accept that 28 W is not a 6 × 8 ft house. The Hylite 300 mm tube is the best value at about £23.49, with IP44 claimed and no printed degree scale.
You have no socket, so paraffin is the only no-mains heater in this set. The Trendi 4.5 L wick heater is about £18.95, with no thermostat. Leave a vent open. The Royal Horticultural Society limits paraffin to H2 or hardier plants.
Nine heaters are not one greenhouse heater. The Airmaster FW400, a 520 W floor convector at about £25.94, is the top pick because it is the listing that states both 240 V and a 5–30°C thermostat, with 4.3 from 173 amazon.co.uk reviews. It has no IP rating, and 520 W is still under a retailer watt example for an uninsulated 6 × 8 ft house. The Hylite 300 mm 28 W tube at about £23.49 is the best value for a small volume on a stated 230 V, with IP44 claimed and 4.1 from 2,276 reviews. The dial has no degree scale. A house with no socket is a paraffin decision, and a 120 V grow-tent heater is a reason to stop.
Hylite 300 mm 28 W tube
28 W at a stated 230 V, about £23.49, with IP44 claimed and 4.1 from 2,276 reviews, for a small volume.
Editorial
Peter F. is the editor for DIY & tools at productscompared.co.uk. Comparisons in this category are checked against amazon.co.uk listings, review evidence and public UK sources.
Guides on what to look for, how to use a product, and common mistakes.
Public UK sources from the research digest, last checked on 17 October 2026.
This article contains affiliate links. If you buy through these links, we may earn a commission at no extra cost to you. The cards use amazon.co.uk listing data and public UK sources. They are not a laboratory test.
