How to Heat Bricks for Small Greenhouses

Written by katie jensen
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How to Heat Bricks for Small Greenhouses
A small greenhouse doesn't require a huge heat source. (Metal greenhouse in summer with open door image by Scott Latham from

Greenhouses extend the growing season into the months on either side of the growing season. Insulated greenhouses with a heating source allow plant cultivation in the dead of winter. Small greenhouses don't need as much heat as larger greenhouses because they have less space to heat. Heating a greenhouse is done by mechanical heaters, passive heating or heating an element of the greenhouse, like bricks, and letting them give off ambient heat throughout the cold nights. Heating several bricks may be all you need to keep your small greenhouse warm.

Skill level:

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Things you need

  • Oven
  • Hot pads
  • Black plastic

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  1. 1

    Turn on your oven to 177 degrees Celsius.

  2. 2

    Place bricks inside the oven. How many bricks depends on the size of the greenhouse and how low the temperature is expected to get.

  3. 3

    Remove bricks with hot pads.

  4. 4

    Place the heated bricks in the centre of the greenhouse away from plants, as 176 degrees C will burn any leaves that touch the bricks. Bricks will stay warm to hot for up to a day.

  1. 1

    Cover the bricks with black plastic. A garbage bag will work.

  2. 2

    Set the bricks in the greenhouse where they will be in direct sunlight all day.

  3. 3

    Move the bricks to the centre of the greenhouse on the floor, so they can radiate heat to the plants.

Tips and warnings

  • Heat more bricks if a cold snap is expected.

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