I have a new duct heater and I want to make sure I am using the correct wire and breaker on the heater and the breaker panel. For some reason I can’t post a photo, but the sticker says
Warren Electric heater with Integral Limit Control
With that amount of amperage it would require # 8 copper wire with a 50 amp double pole breaker. Being you are asking this question I would highly recommend having a qualified contractor install for you