About Our Greenhouse Heaters 🌡️
Keeping your plants thriving through British winters requires reliable frost protection. Our greenhouse heaters range from compact 1.8kW electric models to powerful 2.7kW thermostatically controlled units, all designed for the unique challenges of greenhouse environments. You'll find electric greenhouse heaters with push-button simplicity, high-quality LPG and natural gas options for off-grid locations, and traditional paraffin heaters for budget-conscious growers.
Why We Chose This Range
“We curating our heater range based on one metric: thermostatic reliability. In a humid greenhouse environment, cheap domestic heaters fail because their components aren't IPX4 rated. We chose the Elite and Bio Green models specifically because they handle the 90% humidity of a winter greenhouse without shorting. For off-grid allotments, our paraffin and gas heaters are selected for their clean-burn technology, reducing the risk of ethylene build-up which can damage delicate foliage.”
— Matt, Founder of Greenhouse StoresEvery heater ships with free UK delivery and a 1-year warranty, arriving within 5 days. Whether you need a tubular heater for gentle background warmth or a thermostatic fan heater to circulate air and prevent mould, stainless steel construction across our range withstands the damp conditions that corrode cheaper alternatives. Prices start from affordable entry-level frost protection scaling up to commercial-grade heating systems.
🔧 Matt's Installation Tip: The "Bubble Wrap" Calculation
Don't just buy a bigger heater to solve a cold greenhouse problem. Before installing a heater, I always advise customers to line their greenhouse with UV-stabilised bubble wrap. This single act can reduce your heating costs by up to 50% and allows a standard 2kW heater to protect a much larger 10x12 structure.
Crucially, place your electric heater at one end of the greenhouse, but not directly under a shelf. You need the warm air to rise and circulate in a 'loop'. If you're using a gas heater, remember that for every litre of fuel burnt, you release moisture into the air—you *must* keep a louvre vent slightly cracked to prevent botrytis (grey mould) from taking hold. Read our guide on greenhouse winterisation here.
Choosing Your Greenhouse Heater
Start by measuring your space. A 6x4ft greenhouse needs roughly 2kW for frost protection (maintaining 2°C minimum), while an 8x6ft structure requires 2.5kW. For tropical growing at 15°C+, double these figures.
Technical Comparison: Performance Signals
| Heater Type | Best For | Typical Running Cost | Power Source |
|---|---|---|---|
| Electric Fan | Consistent 10°C+ Heat | Moderate | Mains Power |
| Propane Gas | Large/Remote Structures | High | Gas Cylinder |
| Paraffin | Frost Protection (Small) | Low | Liquid Fuel |
| Tubular | Background Heat | Very Low | Mains Power |
🔥 Heater Sizing Reference
| Size | Frost (2°C) | Warmth (15°C) |
|---|---|---|
| 6ft x 4ft | 2kW | 3.5kW |
| 8ft x 6ft | 2.5kW | 4.5kW |
| 10ft x 8ft | 3kW | 6kW |
| 12ft x 8ft | 3.5kW | 7kW |
Frequently Asked Questions about Greenhouse Heaters
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What size heater do I need for my greenhouse?
As a rule of thumb, a 2kW electric heater is perfect for an 8x6 or 10x6 greenhouse to maintain frost-free conditions. If you are 'forcing' tropical plants or early crops, you may need 3kW. Use our BTU calculator for exact requirements based on your glazing type (Glass vs Polycarbonate).
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Is it safe to use an electric heater in a greenhouse?
Yes, provided the heater is IPX4 rated (splash-proof). All the electric heaters we stock are designed for damp environments. Always ensure your power supply is RCD protected and cables are kept off the floor away from standing water.
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How can I reduce the cost of heating my greenhouse?
Insulation is key. Using heavyduty bubble wrap on the interior and sealing drafts around doors can halve your electricity or gas consumption. Using a heater with a digital thermostat also prevents the heater from running longer than strictly necessary.
✅ Why Buy Greenhouse Heaters from Greenhouse Stores?
Every heater in our collection is CE certified and built for British growing conditions. Free UK mainland delivery gets your heater to you within 5 days, and our 1-year warranty covers manufacturing defects. Need help calculating the right size or choosing between fuel types? Call our greenhouse heating specialists on 0800 098 8877 or email sales@greenhousestores.co.uk for personalized advice.