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With a rig, the load is well out of a pump's optimal flow range and so, you can expect your pump to draw more power, and heat up more.
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I think they heat up less with more restiction. at least thats what I've been told. Next time I take apart my rig I'll have to test that.
Anyway relays are stupid. Just leave the pump on, its made to run years without fail, so why bother switching it on and off?