Login Register

Airmaster Frost Watch Heater 520W 260 x 245 x 150

4.4 (126 reviews)
SKU: 240304163919008 EAN: 5027825601675

Compare 2 prices for Airmaster Frost Watch Heater 520W 260 x 245 x 150 — from £19.00 to £21.90 across 2 UK sellers including Electricals Online, BP Tools UK. Save up to £2.90 (13%).

£19.00 17h ago
View

Compare Prices from 2 Sellers

Prices updated 19 Apr 2026
2
BP Tools UK
£21.90 +£2.90
-1h
#2 BP Tools UK
-1h ago
£21.90 +£2.90
View
Worried about frost damage in your smaller rooms? Don’t be – this Airmaster Frost Watch Heater is perfect for those small areas most at risk. The 520W floorstanding unit can be used anywhere from toilets and greenhouses to caravans and animal accommodation.\nThe adjustable thermostat automatically regulates the temperature between 5°C and 30°C, and will start the heater when it’s needed. Silent operation means no noise disruption, and there’s an automatic safety cut-out for peace of mind.\n\n• Compact electrical convector heater for small rooms\n• 520W heat output with anti-frost protection\n• Floorstanding only – comes with feet\n• Adjustable thermostat with indicator light\n• Automatically regulates temperature from 5°C to 30°C\n• Silent operation for minimal disruption\n• Automatic safety cut-out for peace of mind\n• Robust metal / thermoplastic construction\n• Comes with 1.5m cable and 13A plug (10A fuse)\n• One-year manufacturer’s warranty (T&Cs apply)
Brand Airmaster
Colour White
Heating System Convection
Mounting Location Wall
MPN AIRFW400
Number of Heat Settings Variable
Power Source Electric
Voltage 240 V
No features listed
No items listed

Customer Reviews 126

4.4
126 reviews
5 star
90
4 star
14
3 star
9
2 star
6
1 star
7
Cheaper than paraffin
5.0
February 11, 2026
t2sn2bjvfi7dlrqn2y1efneuh Verified Purchase

Bought this to heat my mini greenhouse, after seeing the price of paraffin. It's brilliant and because it's thermosticaly controlled it's not on all the time. The price is superb. Thanks Toolstation.

Great little heater
5.0
January 18, 2026
Panther Lynn Verified Purchase

Great little heater. I bought this for my hand built little greenhouse which measures 6' High x 6' Wide x 4' Deep with twin wall polycarbonate panels. After a few days of testing it I now have it fine tuned. I have it on its lowest setting and it keeps its lowest temperature at night, when outside temperatures have fallen to -2⁰C, at 12.4⁰C. I can now start sowing my seeds ready for spring and summer. Air master were a good make years ago, when I worked in a garden shop, so I'm hoping that is still the case. It's a really good price, it's not a sturdy piece of kit, but for what it is I'm really happy with it . Time will tell if it lasts. I had to travel to a different Toolstation as my local one didn't have it in stock.

Cheap and cheerful and tiny
4.0
January 18, 2026
Recombinant Verified Purchase

Bought to keep a small unheated utility room from freezing. It has a low power output of 500watts so will struggle in a larger space. Have used it for a couple of weeks so far, no issues.
I subtracted a star because it is flimsy but what do you expect at this price.

Background heater
5.0
January 6, 2026
I prefer summer to winter Verified Purchase

Seems to be adequately responsive to the thermostat and maintains the bedroom at a reasonable temperature.

Nice good little heater
5.0
December 31, 2025
Z18runway Verified Purchase

The heating works very well and kept the space warm and comfortable. Overall a pleasant experience. Would recommend.

Air master Frost watch
5.0
December 5, 2025
Mr Thomas Verified Purchase

The Air master Frost heater is providing the protection to my workshop

Frost watch heater.
5.0
December 3, 2025
Shaun Catterall Verified Purchase

Great product for a good price. Just the job for the greenhouse.

A neat little heater, perfect for small spaces.
4.0
November 8, 2025
Tracey C Verified Purchase

A neat little heater for small spaces. I bought to use in our campervan, it did the job nicely. Unfortunately, when collected there was a bit of damage to the box & the plug on the heater was smashed up & had to be replaced so I have marked down 1star for that.

Simple and effective immediately!
5.0
November 3, 2025
d4dc84a5-a44b-5e9e-9771-19f805ca205b Verified Purchase

Just what I needed for summerhouse to keep away dampness!

Great little heater
5.0
October 4, 2025
Betsyboy Verified Purchase

Great little heater for instant heat.
Only 560watts but ideal to keep your shed greenhouse motorhome above freezing.
Stat included, great price

Depreciated returns
3.0
March 16, 2025
Si6 Verified Purchase

Works but comparable to a 700w device its inefficient, even in small areas. My advice would be to allow for extra dimensions in planning and get a 700w. Most cheap 2000w units have an option for 700/750w limited state.

Good value item
5.0
March 7, 2025
Gladfans Verified Purchase

Easy to assemble- perfect size with the frost guard for a small greenhouse.

Effective small heater.
5.0
March 7, 2025
Bert6 Verified Purchase

Great little heater for my motorhome. Gentle, effective silent heat on thermostat, and it looks good.

Good value for money
5.0
February 12, 2025
jjjjggg Verified Purchase

Obviously low power but, provided it lasts, great for frost protection in a shed or garage.

Green house heater with thermostat, ideal for small spaces
5.0
February 10, 2025
Micheal guisborough Verified Purchase

Excellent little heater for the greenhouse, light and easy to use

Good little heater
5.0
January 27, 2025
Spud22 Verified Purchase

I purchased this to heat a small utility with a glass roof that produced a lot of condensation when cold. It's done the job perfectly, no more condensation and cheap to run. Good little heater would recommend for small spaces.

A good cheap heater
5.0
January 25, 2025
Stevemrst Verified Purchase

Not the hottest in the world but keeps shed warm overnight

Nice low power heater
4.0
January 19, 2025
DC00 Verified Purchase

Good little heater which I'm using in my motorhome when temperatures drop. It would be nicer if the temperature dial had indicative temperatures rather than just dots as it takes a while to figure the best position

Just the job
5.0
January 18, 2025
David S Cheshire Verified Purchase

Small heater, ideal for frost protection, seems well made for the price.

Good value for money
5.0
January 12, 2025
HFM Verified Purchase

Good little heater works well for the size. Not too expensive to run.

200,000+ Products
220+ Trusted Sellers
183,000+ Price Points
72hr Price Updates

Featured Brands

All Brands