What Are Some Ways to Prevent an ITT Marlow Pump from Overheating?

If your ITT Marlow pump is running hot, it’s more than just a temporary glitch—it could be a sign of a deeper issue that, if left unchecked, may lead to serious damage. Overheating not only shortens the pump’s lifespan but also affects the overall performance of your spa or water system. The good news? With a few simple strategies, you can keep your pump cool, efficient, and running like a champ.

1. Keep It Clean, Inside and Out

Dirt, debris, and buildup can block water flow, which leads to stress on the motor. If water isn’t moving freely, the pump works harder to maintain pressure, and that extra effort generates heat. Cleaning the pump housing, filters, and intake regularly helps maintain proper flow and prevents the motor from getting bogged down.

For systems using ITT Marlow pumps, make sure to follow the manufacturer’s maintenance guide. Use a soft brush or cloth to clear away any mineral deposits or gunk around the impeller or intake.

2. Ensure Proper Ventilation

Pumps need room to breathe—literally. If your pump is installed in a tight cabinet or an enclosed spa area, poor airflow could be trapping heat. Make sure there’s enough ventilation around the motor. Adding vent slots, a small exhaust fan, or even repositioning the unit slightly can help it stay cool under pressure.

3. Don’t Skimp on Water Levels

Low water levels might seem like a small problem, but they can wreak havoc on a pump. Without enough water circulating through the system, the pump draws in air instead—and air can’t cool the motor like water does. This often causes the pump to run dry, heat up, and eventually shut down or burn out.

Whether it’s an in-ground spa or a standalone unit, keeping the water level high enough is one of the easiest ways to prevent overheating. This is especially important if you're using a pump for whirlpool tub systems that rely on a steady water feed for proper function.

4. Inspect the Bearings and Motor Regularly

The bearings inside the pump motor help reduce friction. Over time, they wear down or lose lubrication, which causes them to overheat. You may start to hear squealing or grinding sounds just before things go south. Don’t ignore those signs.

Lubricate the bearings if your pump allows it, or replace them when needed. Older ITT Marlow pumps can often benefit from a quick motor refresh. It’s a small job that can prevent big problems.

5. Use the Right Power Supply

Pumps are designed to run within specific voltage ranges. If your power source is unstable, too low, or surging too high, it puts extra load on the motor. This can lead to overheating fast. A dedicated GFCI circuit is ideal for spa and tub setups.

Also, double-check that the wiring and breakers match the pump’s voltage rating. If you’re unsure, have an electrician look it over. It’s not just about performance—mismatched voltage can become a fire hazard.

6. Don’t Run It Non-Stop

Even though many pumps are built for long use, running them constantly without breaks can still push them to the limit. That’s especially true in high-use settings like commercial spas or large residential setups. Set a timer or create an automatic shut-off cycle so the pump gets a breather.

This matters even more if you’re relying on a pump for whirlpool tub use where people tend to run the jets for extended sessions. Letting it rest helps preserve the motor’s internal components.

7. Upgrade If It’s Time

Sometimes, despite your best efforts, the pump still overheats. That could mean it’s just too old or not sized properly for your system. If your spa or whirlpool setup has been upgraded or modified over the years, the original pump might be struggling to keep up.

Upgrading to a newer model—especially one from the trusted ITT Marlow pumps lineup—can give you better efficiency, quieter operation, and improved cooling mechanisms. Plus, newer pumps often come with built-in thermal protection, so they shut off automatically if they start to overheat.

Final Thoughts

Keeping your pump in top shape doesn’t have to be complicated. Most of the time, simple steps like regular cleaning, proper water levels, and a little ventilation go a long way. Add in a routine check-up and you’ve got a solid plan to prevent overheating.

If you’re noticing heat issues more often, don’t wait for the motor to give out. A little attention now can save you from a costly repair or replacement later—and ensure your spa or whirlpool runs smooth for years to come.