Plants Seedling Heating Mat, IP67 Waterproof, 20W Heat Warmer Mat for Growing Greenhouse or Grow Box (20 x 10 in, Thermo
£28.99 inc. VAT (£24.16 ex. VAT)
- Premium quality at just £28.99 inc. VAT
- Free UK delivery on every order
- 30-day no-quibble returns under Consumer Rights Act 2015
- Secure checkout with buyer protection on every purchase
Why Choose PlantsSeed
Optimised Root Zone Heating for British Growing Seasons
Achieve early, uniform seed germination regardless of chilly UK spring weather. The PlantsSeed 20W seedling heat mat uk delivers constant, gentle warming to elevate root zone temperatures 10-20°F (6-11°C) above ambient room temperatures. Perfect for starting tomatoes, chillies, cucumbers, sweet peas, and herbs weeks ahead of the outdoor season.
Integrated Digital Thermostat & Automated Timer
Unlike basic heating pads that continuously run hot and risk drying out compost or scorching delicate roots, our advanced seedling heat mat with thermostat uk features built-in microchip controls. Effortlessly select target temperatures between 20°C and 30°C (68°F-86°F) and set operational run-times using the clear digital display. No separate probe plugins or complicated external wiring required.
IP67 Waterproof & Rugged Multi-Layer PVC Construction
Engineered for damp greenhouse benches, humid grow boxes, and busy kitchen windowsills. Featuring a fully sealed IP67 waterproof rating, this mat withstands splash water, liquid fertilizer runoff, and heavy humidity exposure. The multi-layer reinforced PVC shell protects internal heating wires from wear while distributing heat evenly across the entire 20 x 10 inch surface.
Energy Efficient UK Plug & Play Setup
Running at just 20 Watts, this high-performance propagation heat mat uk consumes minimal electricity, costing mere pence per day. Fitted with a fused 3-pin UK mains plug and high-flex cable, simply unroll, plug in, set your temperature, and place your 1020 seed cell flat or propagator dome directly on top.
Technical Specifications
- Power Consumption
- 20W (230V, 50Hz)
- Temperature Control Range
- 20°C - 30°C (68°F - 86°F)
- Dimensions
- 50.8 x 25.4 cm (20 x 10 inches)
- Waterproof Rating
- IP67 Submersible Sealed Casing
- Plug Standard
- UK 3-Pin Fused Plug (BS 1363)
- Cable Length
- 1.8 Metres Heavy-Duty Flex
- Safety Certifications
- UKCA, CE, RoHS, BS EN 60335
- Warranty
- 2 Years UK Manufacturer Warranty
Price Comparison
See how our price compares across UK retailers
| Retailer | Price | Delivery | Warranty |
|---|---|---|---|
| PlantsSeed UK (Specialist)BEST | £28.99 | FREE | 12 months + UK Support |
| eBay (est.) | £36.24 | Varies | Seller dependent |
| High Street RRP | £46.38 | N/A | Varies |
Prices checked 5 August 2026. Prices may vary.
Customer Reviews
My chilli seed germination rate went from around 40% on my windowsill to near 100% in under 6 days. Having the thermostat built right into the cord without needing a separate plugin box is a total game changer.
Living in the North, starting tomato seeds in February is usually impossible without heated space. This mat maintained a steady 24°C in my unheated greenhouse despite cold nights. Fast UK delivery too!
As a plant biologist and hobby gardener, precise temperature control is critical. Tested the surface temp with a digital infrared thermometer and it held within ±0.5°C of the set point. Excellent product quality.
Great heating mat. The digital display is clear and easy to program. The PVC material was a bit stiff straight out of the box due to cold weather shipping, but flattened out within 10 minutes once powered on.
Replaced an older Garland un-heated propagator setup with this mat under my standard seed tray. My sweet peas sprouted in 4 days! The IP67 waterproofing gives great peace of mind when watering.
Works as advertised for early allotment crops. Really low power draw on my smart plug monitoring (around 19.5W actual). Cable length could ideally be half a metre longer, but standard UK socket extension solved it.
Superb value for money at under £30. Other brands like Vivosun charge extra for thermostatic probes, so having it built in with IP67 waterproof build makes this the best choice for UK indoor growers.