What temperature do tubular heaters reach?

Watlow specializes in manufacturing high-temperature tubular heaters that are designed to meet the needs of both standard tubular heater applications and the more advanced Watlow MULTICELL® heaters. These high-temperature heaters are capable of exceeding temperatures of 704°F (approximately 374°C), with a maximum sheath temperature reaching up to 983°F (approximately 528°C). Recent controlled lab tests have indicated that the new design offers an impressive increase in lifespan, approximately 50 percent longer than traditional tubular heater designs. Constructed from engineered tubing, these high-temperature heaters feature an outer sheath made from Alloy 600, alongside a specialized internal structure that ensures durability. This outer sheath not only excels in high-temperature capabilities but also provides reduced oxidation and corrosion resistance, making these heaters ideal for various industrial applications. This range of tubular heaters is available in diameters of 0.430 and 0.375 inches, and can be customized as formed tubulars or process heaters. Additionally, these heaters can be easily welded to flanges and plates for mounting purposes. For those needing additional length, the maximum sheath length available is 275 inches for both diameter options; contact the factory for longer configurations.

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How to choose the right size and wattage of tubular heaters for your greenhouse

These aluminium Tubular Heaters are rated at approximately 60 watts per foot (30cm). The wattage of each heater available in the range is shown below:

Heater Length Wattage 1' 31cm 60w 2' 61cm 120w 3' 91cm 180w 4' 122cm 240w

To maintain a temperature of 45 degrees Fahrenheit / 15 degrees Celsius, approximately 25 watts of power per square foot of floor area will be needed. For example, 1 kW would efficiently heat around 40 square feet (5ft x 8ft).

The required number of heaters for your greenhouse will depend on several factors:

(1) The size of the greenhouse
(2) Insulation status
(3) External temperatures
(4) Desired internal temperatures.

Thus, we can only provide a rough guide regarding the tubular heater(s) you’ll need. The following table outlines the wattage necessary to keep your greenhouse frost-free, both insulated and uninsulated, alongside the possible configurations of heaters:

Greenhouse Size Insulated Wattage Required Quantity / Size 6' x 8' / 1.8m x 2.4m yes 936w 4 x 4ft 6' x 8' / 1.8m x 2.4m no w 5 x 4ft 8' x 8' / 2.4m x 2.4m yes w 5 x 4ft 8' x 8' / 2.4m x 2.4m no w 6 x 4ft 8' x 10' / 2.4m x 3.0m yes w 5 x 4ft + 1 x 2ft 8' x 10' / 2.4m x 3.0m no w 7 x 4ft 8' x 12' / 2.4m x 3.6m yes w 6 x 4ft + 1 x 1ft 8' x 12' / 2.4m x 3.6m no w 8 x 4ft 10' x 12' / 3m x 3.6m yes w 8 x 4ft + 1 x 3ft 10' x 12' / 3m x 3.6m no w 10 x 4ft + 1 x 3ft

This table illustrates the significant impact of greenhouse insulation on required heating.

Foshan Osno offers a wide range of products; be sure to explore for more information.

Heatsheets Insulation
Using Heatsheets to line your greenhouse can drastically reduce the need for heaters, saving you up to 50% on heating costs through insulation.

These sheets are easy to install and provide effective temperature regulation.

Tubular heaters are designed to operate continuously, and can be controlled using thermostats like the Root!t Thermostat for precise temperature management.

For further details, visit Tubular heater winding and manufacturing machine.