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exmweb.com | 1-800-363-2423 | [email protected] SIZE726DETERMINE THE RIGHT HEATER SIZE FOR YOUR NEEDSWattage selectionThe wattage requirement is determined from a consideration of the surface area, insulation properties of the enclosure, the temperature difference between the ambient and the enclosure and the heating power generated by existing components (e.g. transformer). The following formula can generally be used to calculate wattage requirements for uninsulated enclosures : Ph = ( A X T X k ) - Pv Ph = Required heating power for your application in Watts (W) Pv = Heating power generated by existing components in Watts A = Exposed enclosure surface area in square meters (m2) T = Temperature differential between the desired minimum interior temperature and the lowest possible external temperature of the enclosure in Kelvin (K). 1.8%u00b0F = 1%u00b0C = 1K k = Heat transmission coefficient of the enclosure material used : Painted steel : 5.5W/m2K Stainless steel : 3.7W/m2K Aluminum : 12W/m2K Plastic : 3.5W/m2KFor outdoor applications, it is recommended to double the heating power. This formula is supplied for reference purposes only. EXM offers no warranty, expressed nor implied, as to the application of this table in different environments, as the equipment may be subjected to conditions out of our control.