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Hot Water Recirculating Pump Leaking? Causes and Fixes in Murrieta

By the Murrieta Leak Pros team ·

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Many Murrieta homes have a hot water recirculating pump near the water heater, or a small valve under the sink farthest from it. It keeps hot water moving so you do not wait at the tap. That also means hot water flows through the pipes for hours a day, and a small leak in that loop can waste a lot of water and energy. Call (951) 299-3473 24/7.

If you find water you cannot explain, our leak detection Murrieta CA team checks the pump, the valves and the return line under the slab.

Why is my recirculating pump leaking?

A recirculating pump usually leaks for 5 reasons: worn flange gaskets or unions at the pump, a failed seal in the pump body, a check valve that sticks or cracks, scale from hard water at the fittings, or a leak in the hot water return line. If the pump looks dry but you have a warm spot on a floor, the return line under the slab is the likely source.

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Graphic of 5 causes of a hot water recirculating pump or return line leak
Graphic of 5 causes of a hot water recirculating pump or return line leak

What should you check first?

  1. Unplug the pump or switch off its timer.
  2. Look for drips at the two pipe unions and under the motor housing. White or green crust means a slow leak.
  3. Feel the floor along the path from the water heater to the far bathroom. A warm strip is a red flag.
  4. Check the under-sink valve if you have a pumpless crossover system. Look for drips and water in the cabinet.
  5. Do a meter test with all taps off. If the meter moves with the pump off too, the leak is in the pipes. See our water meter leak test.

Murrieta's water is hard, and scale builds up fast at hot fittings. Shut off the valves on each side of the pump before you touch the unions.

How can a recirculating line cause a slab leak?

The return line runs hot water back to the heater for hours a day. Heat makes the pipe expand and contract, and in a slab home that pipe can rub against concrete or rebar until it wears through. That is why many hot water slab leaks start on the recirculation loop. A warm floor, a high gas bill and a heater that runs all the time are the clues.

Read our guide to a hot water slab leak and warm floor for more signs. Thermal cameras find these well, as our infrared & sonic leak detection guide explains.

Have a leak? Don’t wait for it to get worse.

Our technicians are standing by 24/7 with the equipment to find your leak fast. No unnecessary digging, no guesswork.

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Repair or reroute?

  • Pump or gasket: often a quick swap of the gaskets, the cartridge or the whole pump.
  • Return line under the slab: a spot repair through the floor, or a reroute through the attic or walls.
  • Timer or sensor: setting the pump to run only at busy times cuts wear and energy use.

Slab leak detection in Murrieta usually costs about $250 to $650. Repairs depend on where the leak is. Our slab leak repair Murrieta page explains spot repair and reroute options. The U.S. Department of Energy also explains how hot water use affects energy bills.

Gas water heaters sit right next to most recirculating pumps. If you ever smell rotten eggs there, leave and call SoCalGas first, then our gas leak Murrieta CA service. After a strong quake, also see how to check your sewer line after an earthquake. If water shows up near a floor drain instead, our sewer line leak detection team checks the drain side.

Frequently asked questions

Can a hot water recirculating pump cause a slab leak?

The pump itself does not, but the hot return line it feeds can wear through under the slab over time from constant heat and movement.

How do I know if my recirculating pump is bad?

Signs include a loud hum, no quick hot water at the far tap, drips at the unions or the motor, and a pump that feels very hot to the touch.

Should I turn off my recirculating pump?

If you suspect a leak, yes. Unplug it and do a meter test. A timer can also cut how long it runs each day.

How much does slab leak detection cost in Murrieta?

Slab leak detection in Murrieta usually costs about $250 to $650, depending on the home and the leak.

Prices are approximate estimates for planning. Your final price depends on your property and is confirmed before work begins.

Where can I get help with this in Murrieta?

Murrieta Leak Pros offers Slab Leak Detection, Water Leak Detection. We serve every Murrieta neighborhood:

We also serve Temecula, Menifee, Wildomar, Lake Elsinore, Winchester, French Valley, Canyon Lake, Hemet and Sun City. See all service areas →

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