Think this way, people use 2 or more 172 or 226 W pelts and cool them with just a big heater core. 2 172 W pelts can put 500 W of heat into the water.
You're going to have a much larger pump and more cooling capacity. Should be fine as long as you keep the flow up.
edit: Two 400 or 500 W elements, one from each end would work just fine. I was just trying to show how common items could be used.
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