What temperature do tubular heaters reach?

Watlow manufactures high-temperature tubular heaters to bridge the gap between standard tubular heaters and Watlow MULTICELL&#; heaters. This high temperature heater is well suited for process air heating applications in excess of ˚F (704˚C), resulting in a maximum sheath temperature of ˚F (983˚C). Controlled lab testing between the new design and current tubular designs shows an increase in life of approximately 50 percent. The high-temperature heaters consist of an engineered tubing with an outer sheath of Alloy 600 and a special internal construction. The outer sheath offers high temperature capabilities, reduced oxidation as well as corrosion resistance. The tubular heater offering is available in 0.430 and 0.375 inch diameters that are configurable either as formed tubulars or process heaters. The tubular heaters can also be welded to flanges and plates for mounting purposes. Maximum sheath length available is 275 inches for the 0.430 inch and 0.375 inch diameters. The factory should be contacted for longer sheath lengths.

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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

Very roughly speaking, to maintain a temperature of 45 degrees Fahrenheit / 15 degrees Celcius you&#;ll need approximately 25 watts of power per sq. ft. of floor area. E.g. 1KW would heat approximately 40 sq.ft. (5ft x 8ft).

To calculate the heater or number of heaters you&#;ll require within your greenhouse is affected by several factors:

(1) The size of the greenhouse
(2) Whether the greenhouse is insulated or not
(3) The external temperature
(4) The internal temperature required.

It is therefore only possible for us to provide you with a rough guide as to the tubular heater(s) you&#;ll require. The table shown below shows you the wattage required to keep your greenhouse frost free &#; whether insulated or not insulated &#; and the possible combination of heaters required to achieve this:

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

The table above illustrates how important insulating your greenhouse can be.

Foshan Osno contains other products and information you need, so please check it out.

Heatsheets Insulation 
By simply lining your greenhouse with Heatsheets you'll reduce the size or number of heaters you&#;ll require to keep your greenhouse warm.

Easy to install you can save up to 50% of your heating costs by insulating your greenhouse. 

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Tubular Heaters have been designed to be left running constantly (and switched off when not needed) as they have an output of 60w per foot.

However, by attaching a thermostat to the heater &#; for example our Root!t Thermostat &#; you&#;ll ensure your heaters are only run when needed to maintain the temperature you specify and will turn off and on automatically.

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For more information, please visit Tubular heater winding and manufacturing machine.