Hello: I was able to salvage a like new Modine HER150 B 3201 Electric Heater--Industrial/Commerical type from a demolition job my company was performing. I checked the Modine web site and found this model is a 240volt 3-Phase electric power type. I noted that Modine made a HER100 that could be one or 3-Phase operation. All the wiring diagrams are posted here on the web site. My question is can I rewire the Model HER150 to operate on 240volt 1-Phase electrical power I have in my repair shop? And what is the real difference between these two models---specs seem identical except for electric requirements and btuh--I figured the difference was in the coils...but could not tell this from the specs. I would appreciate any information. Thank you.

The answer is yes you could rewire this heater and use it on single phase, keep in mind that it will pull a higher amp draw then the HER-100 because it is a larger heater. (more BTU's) These heaters have heating elements in them with an electrical connection on each end of the element (this is single phase) You might have three elements , each being single phase but wired to three phase power . Three phase is three wires , single phase is two wires. If you used only two of these three wires then it would be single phase, what they do is use a different combination of two of these three wires to feed the single phase heating elements so if you wired it for single phase then the two line voltage wires would feed each of the elements, this means that the amp draw would be greater running it on single phase then three phase and would need to be compensated for in choosing the wire size. You could also not wire one of the heating elements and this would drop the amount of current (amp draw) required, meaning smaller wire . I hope this is helpfull. Mike

I am looking at a HER100 that 208 volt. acetc, do you know if this can also run at 240 volt without modifications? What amp circuit would I need to run an what gauge wire?

Thanks!

Yes, this unit will also run on 240 vac at a lower amperage than the at 208 volts. Power=Voltage x Amperage. Change the voltage upward and the amperage goes down.