Keep your greenhouse warm
Reliable heat for healthy growthBio Green greenhouse heaters deliver efficient, consistent warmth for stronger plants and year-round success. With thermostat control they only run when your plants need it.
Get your greenhouse ready for winter
Keep your plants frost-free all winter
One frosty night can undo a whole season of work. With a reliable greenhouse heater and a thermostat, your greenhouse stays above freezing automatically – so citrus trees, geraniums, tender perennials and young seedlings come safely through the winter.
- Automatic frost protection with thermostat control
- PALMA heater & fan for standard 120 V outlets – 5,120 BTU/h
- PHOENIX with 2,800 W for larger greenhouses (240 V)
- Grow tunnels and winter covers for beds and raised planters
How do you want to protect your plants?
Electric greenhouse heatersPALMA runs on a standard 120 V outlet, PHOENIX delivers 2,800 W on 240 V. With a thermostat they only heat when your plants need it.Shop heaters →
Frost protection & grow tunnelsThe SUPERDOME grow tunnel and winter covers shield beds and young plants from frost, wind and snow – no power needed.Shop winter protection →
Thermostats & accessoriesThe THERMO 2 digital thermostat switches your heater on and off automatically – from -58 to +210 °F – and saves energy.Shop thermostats →Greenhouse heaters
The right heater for your greenhouse
Not sure how much heating power you need? Our free calculator does the math for you.
Start the calculatorNote the length, width and height of your greenhouse and the type of glazing.
Enter your coldest night and target temperature – the calculator recommends the right heater for 120 V or 240 V.
Order directly in our shop – free shipping on orders over $100, delivered within the USA.
Heating your greenhouse – frequently asked questions
What temperature should a greenhouse be kept at in winter?
For simple frost protection, about 40 °F (4 °C) is usually enough. Tender plants such as citrus or tropical plants prefer 50–60 °F (10–16 °C). A thermostat keeps the temperature stable automatically and saves energy.
How many BTUs does my greenhouse heater need?
That depends on the size of your greenhouse, the glazing and your coldest winter night. Our Greenhouse Heater Calculator gives you a recommendation in under a minute – in BTU/h and watts.
120 V or 240 V – which heater fits my outlet?
The PALMA plugs into any standard 120 V household outlet (750 / 1,500 W, up to 5,120 BTU/h). The PHOENIX delivers 2,800 W and needs a 240 V dryer-style outlet. Not sure what you have? Ask an electrician before ordering.
Can I use the heater in summer too?
Yes – PALMA and PHOENIX can also run as a fan. Good air circulation in summer helps prevent heat build-up and mold in the greenhouse.
How fast do you ship?
Orders ship with UPS within the USA; standard delivery takes 3–5 business days. Shipping is free on orders over $100.