We have a commercial building, and recently purchased a water heater which requires 240v.
We have two older 240 3 phase power panels (one not being used) (I think called "B" phase) which we cannot obtain 120v from.
We also have 120v coming in on a separate panel which is only 100 amp service.
The water heater requires 112 amps at full load, and gets it sequentially from 3 - 40 amp GFI breakers. Hooking up to two of these 240 3 phase wires as the licensed electrician advised gives us 239v at the heater, but apparently we also need 120, as we are not getting sufficient heat from the unit. Are we better off upgrading the 120v 100 amp service to 200 amp (or more), or is there a way to get 240v and 120v from the old B phase which would be more cost effective than using the 120v service?
We have two older 240 3 phase power panels (one not being used) (I think called "B" phase) which we cannot obtain 120v from.
We also have 120v coming in on a separate panel which is only 100 amp service.
The water heater requires 112 amps at full load, and gets it sequentially from 3 - 40 amp GFI breakers. Hooking up to two of these 240 3 phase wires as the licensed electrician advised gives us 239v at the heater, but apparently we also need 120, as we are not getting sufficient heat from the unit. Are we better off upgrading the 120v 100 amp service to 200 amp (or more), or is there a way to get 240v and 120v from the old B phase which would be more cost effective than using the 120v service?