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1) What is currently being powered by the 40 amp double pole breaker? Is the 40 amp breaker being used?
2) Does 4W mean 4 wires or 4 watts? Is that a typo? Doubt that a 220 volt wall heater is 4 watts? Please confirm.
(1) not being used
(2) The wall heater is 220V 2.15 amps 475 WATTS
Envi wall heater
Are you still there!
Thanks for the replies Paul
1) No, you will need a smaller breaker, ie....a 15 amp double pole breaker to serve the small heater in question.
2) If the heater is protected by using the existing 40 amp breaker, that is a violation of the National Electrical Code, since the breaker is sized too large. That is called "over-fusing". Your connected load is only 2.15 amps, therefore the smallest breaker would be a 15 amp.
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So if I have 2 heaters the same will the 15 amp breaker work
1) Yes, if both heaters are the same wattage and both 240 volts, your connected load will be 2 x 475 watts = 950 watts total.
Apply Watts Law where P = Watts, I = Current and E = Volts
P = I x E
Therefore, 950 W = I x 240
I = 950/240 = 3.95 amps.
2) The two heaters will be connected in parallel and served by a 15 amp double pole breaker, 240 volts.
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