It is essential to select the right fountain during replacement to ensure a smooth flow of water. A too-large outdoor fountain pump makes the water too little to flow while a too-small may burn out because of running out of water. Always troubleshoot the problems before considering replacement. It could be fixable issues like clogging or issues with the power cord.

To select a replacement for an outdoor fountain pump, first, decide the one you need. Whether standard submersible, in-line cable, or low water shut-off pumps. The standard submersible has water flowing through them and can overheat and damage when there is no water. Low water shut-off works like standard submersible but automatically turns off in the absence of water and turns back on when water is available, making them ideal for dry areas. In-line capable don’t have water flowing through them. Instead, they sit below the fountain with a tube connection between the fountain and the pump.

The following are low water shut-off fountain pumps available:

Small Fountains

They are slightly larger than the tabletop fountains. The pumping height is approximately 3-ft, and the flow rate is between 80 to 170 GPH.


They are the smallest fountains that sit on tables. The flow rate is 50 to 80 GPH, and the pumping height is approximately 2-ft.


The pumping height is 5-ft, and the flow rate of 150 to 300 GPH. The GPH used determines the flow.


They are the largest fountains supporting a pumping height of 7-ft and a flow rate of 300 to 500 GPH. They are best for large fountains.

Besides these sizes, the following are the factors to consider when choosing a pump;

Water Volume

Larger water volumes require large pumps. Find out the volume of a pond in gallons by multiplying the width feet by length feet by average depth feet by 7.5. If the result is 300 gallons and requires a two-hour interval water circulation, a pump with a 150GPH flow rate is appropriate.

Water Type

The flow rate depends on the functions. Waterfalls and those with skimmers require circulation at the one-hour interval. Ponds with fish should circulate every hour while those without circulate every two hours. Small water bodies about 250 gallons should allow water circulation once an hour, while the larger require circulation half the rate of the smaller ones.


Fountains requiring high water pressure need more robust pumps. Pumps have head heights that help in determining their suitability. The vertical height in which water will travel and 1/10 of horizontal distance from the pump determine the minimum head height.

Discharge Diameter

The tubing size and the discharge diameter should match to ensure an accurate flow rate.

Water Function

Aeration is necessary for water housing fish and other animals. Larger pumps enhance water circulation, which promotes filtration and ventilation. More fish survive in ponds with large pumps.

Replacement fountain pump selection may be intimidating, mainly because the fountain comes with the pump during the original purchase. There are several features, such as size, low water shut-off, height requirements, and flow rate. A little research may reduce the struggle of getting the right item.