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Breaker wire size chart11/20/2023 ![]() (For example: a 2250 Watt Pic-A-Watt® heater will provide as much heat as a 9 foot baseboard.)Ĭomfort: A fan-forced heater will heat a room within a few minutes whereas a baseboard will require 30 to 40 minutes. Space: A baseboard heater takes up more wall space than a fan-forced heater which can cause problems placing furniture. A 120 Volt heater run at 240 Volt will be 4x 120 Volt rated wattage, destroying the heater which possesses a severe fire hazard. A 240 Volt heater run at 120 Volt will produce 25% of the rated wattage. 120 and 240 Volt heaters are not interchangeable.240 Volt heating circuits are more common because it reduces the Amp draw on your breaker/fuse panel, as the chart shows, you can place more heaters on a 20 Amp 240 Volt circuit (maximum of 3840 Watts) versus a 120 Volt circuit (maximum of 1920 Watts). A 1500 Watt heater will cost the same to run whether it is 120 or 240 Volt.If more heaters are needed either run a new circuit or increase the wire and breaker size to accommodate the load.) These 3 heaters would require 14/2 wire and a 20 Amp 2-Pole breaker if they were to all be placed on the same circuit. When placing multiple heaters on a circuit do not exceed the wattage listed for the corresponding wire and circuit breaker size.Use 2-wire cable with ground (Romex™ or BX). ![]() 120 Volt heaters require 1-Pole circuit breakers 240 Volt heaters need 2-Pole breakers.(For example: a 20 Amp heating circuit cannot have more than 16 Amps of load connected.) ![]() According to the National Electric Code heating circuits are considered a continuous load and therefore must be derated by 25%.Always consult local codes for proper sizing. ![]()
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