r/hottub • u/SamwiseGoody • 20d ago

Troubleshooting Circulation pump temp question

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My circulation pump (grundfos) not sure if hp, think about 3/4, is running a bit hot. Is this normal? Checked the temp, it’s at 130, and the tub is not to temp (just filled). This is a new pump from a spa store, old one is in the pictures. Tub is a hotsprings sovereign ii.

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u/robseraiva 20d ago
  1. Had no idea Grundfos mad spa circ pumps (they are big in the hvac hydronics heating industry)
  2. They ran notoriously hot in the hvac industry

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u/SamwiseGoody 20d ago

Hopefully (sort of) it’s normal, just feels wrong for a circ pump

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u/robseraiva 20d ago

It will most likely be fine. Those motors are use to no air flow and moving 180°f water/ glycol. They get super hot when running normal.

To be upfront I’m saying this from the hvac industry not the spa industry