Your pond pump runs 24 hours a day, 365 days a year. Your furnace and air conditioner get an off-season, but the pump doesn't: that motor is spinning right now, and it will still be spinning at 3 AM. Over a year, that steady draw is the difference between a 60-watt pump that costs about $95 to run and a 250-watt pump that costs about $394.
A cheap pump that draws a lot of power can cost more over three years than an efficient one that cost more to buy. Here is how to work out your real cost, and how to bring it down.
Below are the formula, a calculator, a running-cost table for the main pump lines we carry, and ways to cut your electricity bill without shortchanging filtration.
The energy cost formula
The formula uses three numbers: your pump's wattage, the hours it runs, and your electricity rate.
Example: A 300-watt pump running 24/7:
300W × 24 × 365 = 2,628,000 Wh = 2,628 kWh
2,628 kWh × $0.18/kWh = $473.04/year = $39.42/month
Your electricity rate is on your utility bill, on the line for price per kWh. The U.S. average residential rate was 18.31 cents per kWh in July 2026, so this page uses $0.18. Rates run from 12.72 cents in Louisiana, the lowest state, to 48 cents in Hawaii, and California averaged 33.61 cents. The same 300 W pump costs about $334 a year in Louisiana and $1,261 in Hawaii. Rates are from the U.S. Energy Information Administration's July 2026 data, checked October 21, 2026.
Not sure of your pump's wattage? Look for the nameplate sticker on the pump housing or check the manual; some of our listings show it too. The nameplate gives watts (W) or amps. If it only gives amps, amps times voltage (usually 120 V or 230 V) gives an upper estimate, because an electric motor usually draws somewhat fewer watts than that.
Pond pump energy cost calculator
Enter your pump's wattage and your electricity rate. No email required.
Size the pump for flow and head first with our Pond Pump Calculator, then come back here for the energy math.
What each pump line costs to run
The table below gives yearly electricity and 3-year total cost of ownership (TCO), meaning the purchase price plus three years of electricity, for the main pump lines we carry. TCO is a fairer comparison than the sticker price, because a pump that runs 24/7 can cost more to power than to buy.
The power figures are the makers' own: the maximum draw for PerformancePro, Sequence, the OASE 11500 and Evolution Aqua, Anjon's rated watts, and OASE's operating figure for the 6800. A pump running at your system's head usually draws less than its maximum, so the real cost is often lower. EasyPro doesn't publish watts for the VSP165, so read them off the nameplate and use the calculator above. Yearly costs run the pump 24/7 at $0.18/kWh, the U.S. average, and at $0.13/kWh, about the lowest state rate. The 3-year column adds three years of electricity at $0.18/kWh to the listing price. Treat the numbers as a comparison, not a bill.
| Pump | Type | Maker's power figure | Yearly kWh | Yearly @$0.18 (U.S. average) | Yearly @$0.13 (about the lowest state rate) | 3-year cost @$0.18 | Shop |
|---|---|---|---|---|---|---|---|
| Sequence Titan 12000SEQ21 | External | 845 W max | 7,402 | $1,332 | $962 | see current price | View |
| Sequence Titan 18000SEQ45 | External | 2,110 W max | 18,484 | $3,327 | $2,403 | see current price | View |
| Sequence Power 4000 (11200PWR81 or 13200PWR81) | External | 2,162 or 2,595 W max | 18,939 or 22,732 | $3,409 or $4,092 | $2,462 or $2,955 | see current price or see current price | View |
| PerformancePro Cascade Low RPM (5 sizes) | External | 130 to 340 W max (1/8 or 1/4 HP) | 1,139 to 2,978 | $205 to $536 | $148 to $387 | see current price to see current price | View |
| PerformancePro Cascade High RPM (6 sizes) | External | 600 to 1,930 W max (1/3 to 2 HP) | 5,256 to 16,907 | $946 to $3,043 | $683 to $2,198 | see current price to see current price | View |
| Anjon Landshark (4 sizes) | External | 250 to 1,100 W (rated) | 2,190 to 9,636 | $394 to $1,734 | $285 to $1,253 | see current price to see current price | View |
| EasyPro VSP165 Variable Speed | Ext Variable | Not published by EasyPro; varies with speed | Use the calculator with the nameplate watts | see current price, plus electricity | View | ||
| OASE AquaMax Eco Expert 6800 | Submersible | 440 W | 3,854 | $694 | $501 | see current price | View |
| OASE AquaMax Eco Expert 11500 | Submersible | 730 W max | 6,395 | $1,151 | $831 | see current price | View |
| Anjon Monsoon MS-3000 | Submersible | 192 W | 1,682 | $303 | $219 | see current price | View |
| Anjon Monsoon MS-6100 | Submersible | 354 W | 3,101 | $558 | $403 | see current price | View |
| Evolution Aqua VP10 Adjustable Flow | Sub Variable | 90 W max | 788 | $142 | $102 | see current price | View |
Of the pumps in the table, the Evolution Aqua VP10 costs the least to run, about $142 a year at its 90 W maximum, but it tops out at 2,642 GPH, so it suits smaller ponds. The Anjon Monsoon line covers the widest range of sizes, from 54 W for the MS-550 to 1,100 W for the MS-15000. Most external figures here are maximums, so read your own pump's nameplate and use the calculator for a closer number.
Not sure which pump fits your pond? Start with our Koi Pond Pump Guide to match flow rate to pond size, then come back here to check the energy math.
Variable speed pumps
Pump power follows the affinity laws: power draw changes with the cube of speed. Cut the speed in half and, in theory, the pump needs about one-eighth of the power, not half. Real motors and drives lose some of that gain, so at 50% speed a pump typically uses about a quarter of its full-speed power.
That matters for koi ponds because most owners buy a pump rated for more GPH than they need, on purpose, to leave headroom for TDH losses. On a single-speed pump, that extra capacity costs electricity. On a variable speed pump, you turn it down to the flow you need and keep the savings.
Here is an example. You need 3,000 GPH for your filtration and buy a variable speed pump rated at 5,000 GPH, so you run it at about 60% speed. On paper that takes about 22% of full power (0.6 x 0.6 x 0.6). Real pumps fall short of the theory, but even at twice that figure, a pump that draws 400 W at full speed would pull about 175 W at your target flow: roughly $276 a year instead of $631. No maker publishes reduced-speed watts, but some pumps show them: the Evolution Aqua Varipump's display shows its operating wattage, so you can read your real draw at each setting.
Variable speed pumps cost more upfront than a single-speed pump of the same size. To find your payback time, divide the price difference by what you save each year. At the $180 to $240 a year in the FAQ below, every $500 of extra cost takes about two to three years to earn back. After that, the savings keep coming for as long as the pump runs.
Six ways to cut your pond pump's electricity bill
Even if you're not ready to swap pumps, these changes can reduce what you're paying right now.
- Size your pipe correctly. Larger pipe means less friction, so the pump works against a lower Total Dynamic Head (TDH). Our TDH guide puts friction at about 16 feet of head per 100 feet of 1.5" pipe at 3,000 GPH, against about 4 feet for 2" pipe. With less head to fight, a smaller pump can do the job, or a variable speed pump can run slower. Use our Pond Pump Calculator to check your pipe sizing.
- Use variable speed and dial down to what you need. Because power falls with the cube of speed, even small speed cuts save a lot. If you already have a variable speed pump, try turning it down 10 to 20% and watch whether your filtration keeps up.
- Run your waterfall pump on a timer. Your filtration pump needs to run 24/7, but does anyone enjoy a waterfall at 3 AM? Putting a dedicated waterfall pump on a 12 to 16 hour timer cuts that pump's electricity by a third to a half. Keep the filtration system running around the clock and time only the feature pump.
- Position the pump close to the pond. Every extra foot of pipe adds friction, and shorter runs mean lower TDH. Plan your equipment pad with this in mind.
- Keep your pre-strainer clean. A clogged strainer basket starves the pump of water, so you pay for less flow and risk cavitation damage. Clean it weekly during heavy leaf season.
- Consider two right-sized pumps (more on this below). Two pumps that together match your flow can use less electricity than one oversized pump, and they give you a backup.
Two smaller pumps or one big one?
When two smaller pumps beat one big pump
Two smaller pumps can use less electricity than one oversized pump, and they keep water moving if one fails.
The savings come from sizing more than from the number of pumps. Two 1/8 HP Cascade Low RPM C1/8-22 pumps are rated 130 W and 36 GPM maximum each, so together they make 260 W and 72 GPM. One 1/4 HP C1/4-44 is rated 280 W and 73 GPM, and it reaches 21.8 feet of head against 15.4. On paper the pair saves about 20 W, or $32 a year, and the single pump handles more head. So two small pumps don't automatically beat one bigger one. They win when the single pump you would otherwise buy is bigger than you need, or when you can switch one off for part of the year. Compare the combined nameplate watts with the single pump's before you decide.
But the benefits go beyond electricity:
- Built-in redundancy. If one pump fails, the other keeps your filtration running while you troubleshoot or wait for a replacement. With a single pump, failure means zero flow and a potential fish emergency.
- Independent throttling. If both are variable speed, you can run one at high and one at low, or shut one down entirely during cooler months when biological filtration demand drops.
- Staged flow. Run one pump for base filtration and add the second only when you need extra flow for water features, UV sterilizers, or heavy feeding periods.
- Easier maintenance. Service one pump while the other keeps the system running, with no emergency shutdown and less stress on the koi.
This makes the most sense once your total flow need reaches about 4,000 GPH. For smaller ponds, one efficient pump or a variable speed unit is usually simpler and cheaper. Our Koi Pond Pump Guide will help you find your target GPH first.
Pond pumps and air pumps
This guide covers water pumps, the ones that circulate pond water through your filtration. Aeration pumps push air, not water, and are a separate category that usually draws less power. See our Pond Aeration Guide for those.
Frequently asked questions
How much does the average pond pump cost to run per month?
Most koi pond pumps cost between $9 and $39 a month to run, depending on the wattage and your local electricity rate. A typical 300-watt pump at the national average of $0.18/kWh costs about $39 a month. Efficient models in the 100 to 200 watt range bring that down to about $13 to $26 a month, and a variable speed pump turned down to around 50 W can cost as little as $7 a month. Use the calculator above with your pump's actual wattage to get your number.
Are external pumps more energy efficient than submersible pumps?
It depends more on the model and on your system's head than on the type. External pumps tend to hold their flow better against head, which is where most koi ponds run, while a pump's headline GPH is measured at zero head. Asynchronous submersibles like the Anjon Monsoon and Evolution Aqua lines are efficient for their size: the Monsoon MS-3000, for example, is listed at 3,000 GPH for 192 W. Compare flow at your head against listed watts, and remember that variable speed, available in both external and submersible designs, makes the biggest difference.
Is it worth upgrading to a variable speed pump?
Often, yes. A variable speed pump at 70% speed uses roughly half the energy it uses at full speed, because power falls with the cube of speed. If you spend $30 a month running a single-speed pump, a variable speed replacement could cut that to $10 to $15 a month, saving $180 to $240 a year. Payback depends on the price difference: at those savings, every $500 of extra cost takes about two to three years to earn back. The table above lists the power draw for each pump line.
Does pipe size affect energy cost?
Yes. Undersized pipe adds friction, which raises the Total Dynamic Head (TDH) the pump works against. At 3,000 GPH, 1.5-inch pipe loses about 16 feet of head per 100 feet of pipe, against about 4 feet for 2-inch, according to our TDH guide. Less head lets you use a smaller pump or turn a variable speed pump down, and that is where the electricity savings come from.
Can I run my pond pump on solar?
Technically yes, but it's impractical for a koi pond. The pump runs 24/7, so a 300-watt pump would need a solar array plus a battery bank big enough to carry it through nights and cloudy days. A reliable setup with panels, batteries and an inverter runs to several thousand dollars, often more than the electricity it would save over the pump's life. Solar suits small decorative fountain pumps that only run in daylight. For a koi pond, an efficient or variable speed pump is the cheaper way to a lower bill.
Putting it together
The point of this page is what you will actually pay over three years, purchase price and electricity together. Sometimes the cheaper pump costs more in the long run, and sometimes it really is the better deal. The table and the calculator show you which.
If you're building a new pond or replacing a pump, start with two questions:
- How much flow do I need? Use our Pond Pump Calculator to find out.
- What will it cost over three years? Use the table and calculator on this page to compare.
Got questions about which pump fits your setup? Our Koi Pond Pump Guide covers flow rate, head pressure and plumbing layout. Or give us a call; we're happy to talk pumps.