A relay is nothing more than a "switchable switch"... it is a switch that can carry a heavy load - switched by a switch that is only capable of carrying a light load. This saves the light switch from burning out.
I would ABSOLUTELY run the electric pump on a relay... regardless of how it's wired now. All you have to do is to wire the "LOAD" (the pump) to the relay and have the relay doing the heavy current... and use the wiring you have now run to it - to switch the relay.
I would think that the pump should be run "continuous". So it might only be switched on once during the run cycle... but should still be on a relay. The wire gauge and relay should be sized correctly for the load. Looking at their website - they sell a 30 amp relay as an "upgrade"...
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