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I installed a Dayton 3UG73D 5000W Electric Utility Heater 2 years ago. I woke up this morning to find my garage, where it is located, to be extremely hot. I checked the heater and removed the bottom panel to find the top wire coming off the thermostat to be charred and extremely hot. This is a 240V single phase heater. I wired it using 10 AWG-2 with ground connected to a 30amp double through double pull breaker. Each line (white wire and black wire) is supplying 120V and each is connected to the L1 and L2 terminals as indicated on the wiring diagram. Did I wire this correctly or is there something wrong with the unit itself?

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To wgrochowski -- It appears there IS a problem with the 3UG73D heater thermostat connection. Dayton gave you a hushup replacement. I installed 2 of these in my work shop about 3 years ago. One stopped working a year ago and I did nothing about it because the other one turned out to be sufficient. The second did the same thing about two weeks ago. I went online and found other customers having the same problem. The most recent had one wire to the thermostat slightly charred and burned off. The first one, however, from a year ago had the wire seriously burned and fire inside has charred the metal above the thermostat.

Posted on Feb 29, 2012

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220 - 240 volt, 60 hertz, properly grounded circuit with 40 amp breaker or fuse protection with #8 gauge wire. For Electric Heaters.

Posted on Dec 28, 2010

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  • wgrochowski Dec 28, 2010

    #8 AWG wire with 40amp breaker is not need as long as the run from the panel to the heater is 100 feet or less. #10/2 on a 30amp would be appropriate.

  • Robert Moller
    Robert Moller Dec 28, 2010 according to page 5 #10 gauge unless otherwise stated by local codes. Sorry our code specifies #8

  • wgrochowski Dec 28, 2010

    My problem is not how I wired it. The manufacturer's wire coming off the top of the thermostat is overheating to the brink of a fire. The good news is that Dayton contacted a local grainger dealer and agreed to analyze my unit and replace it with a new one for free. I am concerned there is a defect with my particular unit as it is only 1 year old.

    Thanks for your help.



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