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Current is drawn NOT pushed. Always safe to add lower consumer to higher provider but unsafe the other way around. Now that does not mean it will work if breaker is 20A and heater is kicking on while a high draw whatever he is adding also kicks in at the same time which will trip the breaker so that the wiring to both is saved from overload. Is using propane for water heater an option? More information is needed like what he wants to plug in.
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