Electric pool vacuum vs suction and pressure cleaners
An electric pool vacuum carries its own motor and its own filter, so it cleans without borrowing anything from the pool's plumbing. Suction-side and pressure-side cleaners do the opposite: they are passive bodies driven by water your pump is already moving, or by a second pump installed to move it. That single difference decides how much each type costs to run, and the gap is wider than most buyers expect.
Below is a worked example with every assumption written down, then a look at what the purchase price and the navigation actually buy. The running-cost figures are an illustration built from stated assumptions, not measurements taken from a meter.
What counts as an electric pool vacuum
Two designs share the label. A cordless unit runs from an onboard battery, so nothing connects to the pool while it works and nothing connects to the house except a charger between cycles. A corded unit takes low-voltage power through its own cable from a deck control box. Both filter debris internally, keeping it out of your pump basket and filter.
The WYBOT C1 Cordless Robotic Pool Cleaner at $399.99 at the time of writing is a representative entry point. Its listing quotes 3,038 GPH suction, runtime of up to 150 minutes in Eco mode, a 180 micron large-particle cartridge, coverage for pools up to 1,615 sq ft, and a 2-year limited warranty, cleaning floor, walls, waterline, steps and slopes using S-path and N-path navigation.
Where suction-side and pressure-side cleaners get their power
A suction-side cleaner has no motor. It connects by hose to a skimmer or dedicated suction line and is dragged around by the flow your filtration pump generates, sending everything it collects into the pump basket and filter. A pressure-side cleaner also has no motor, but runs off a return line, which on most installations means a separate booster pump sized to drive it. The question is never whether the cleaner uses electricity; it is which motor does the work and for how long.
| Cleaner type | What drives it | What the pool has to supply | Where the debris ends up |
|---|---|---|---|
| Cordless electric robot | Onboard battery and internal motors | Nothing. A wall outlet to recharge between cycles | Onboard filter cartridge or basket |
| Corded electric robot | Its own low-voltage supply through a deck control box | One household outlet within cable reach | Onboard filter cartridge or basket |
| Suction-side cleaner | Flow from the pool's filtration pump | Pump running, plus a skimmer or dedicated suction line | Pump basket and pool filter |
| Pressure-side cleaner | Pressure from a return line, usually via a booster pump | A return line and, on most builds, a second pump | Its own mesh collection bag |
A worked example of the running cost, with every assumption stated
The arithmetic below is an illustration, not a measurement. These cleaners do not generally publish a wattage figure, so the one power number used here is a published charging figure; everything else is an assumption you should replace with your own.
The Beatbot Sora 10 Robotic Pool Cleaner listing states charging takes about 3.5 hours at 65W. Assume the charger pulls a constant 65 W for the whole 3.5 hours. That gives roughly 0.23 kWh per full charge. This is deliberately an upper bound, because a real charger tapers as the cell fills, so actual consumption will be lower.
Now assume three cleaning cycles a week across a 20-week season, which is 60 charges, or about 13.8 kWh. Take your own price per kWh from a utility bill; at an assumed 18 cents, the season's electricity comes to roughly $2.50. That is the entire energy bill for a cordless machine, and the assumptions are doing all the work in that number.
For a pressure-side cleaner the driver is a booster pump, so read the nameplate on yours rather than trusting any figure here. As a purely hypothetical comparison, suppose it reads 750 W and you run it three hours per cleaning cycle. That is 2.25 kWh per cycle, 135 kWh across the same 60 cycles, and about $24 at the same assumed 18 cents. On these assumptions the pressure-side setup costs roughly ten times as much to run, and the ratio holds as long as the booster pump has to spin.
Suction-side cleaners sit in between and are hardest to pin down honestly. They add no second motor, but only work while the filtration pump runs, so the marginal cost depends on whether you extend pump hours and by how much. If you do not extend them at all, the marginal energy cost is close to zero, and the real cost shows up as debris routed through your filter instead.
Corded electric: what the cable actually carries
A corded cleaner has no battery to size and no charge cycle to wait for, so cycle length is set by a timer instead. The Chasing Hydro 4 Corded Robotic Pool Cleaner at $799 offers 1, 2 and 3 hour presets, a 49.2 ft (15 m) anti-snag swivel cable, 320 L/min (5,070 GPH) suction, 180 micron filtration, and coverage up to 1,614 sq ft, with HydroCurve S path navigation quoted at up to 95% coverage. The robot weighs 6.5 kg (14.3 lb) with a 1.5 kg (3.3 lb) control box, under a 2-year limited warranty covering the main unit for 24 months and consumables for 6 months.
Cordless electric: the charge cycle is the whole bill
With a cordless unit, runtime and coverage per charge are what matter, because a machine that cannot finish your pool in one cycle doubles your charge count. The WYBOT S2 High-end Cordless Robotic Pool Cleaner at $759.99 quotes up to 210 minutes per charge, about a 3-hour quick charge, 3,592 GPH suction, a 180 micron filter backed by ultra-fine cotton foam, coverage up to 3,230 sq ft, and a 2-year limited warranty. That coverage is double the C1's, the real reason to pay the difference on a larger pool.
The purchase price gap is the bigger number
Energy is the smaller line item. What decides most purchases is total installed cost, and a pressure-side setup carries a booster pump, the plumbing to feed it and the electrical work to power it. An electric robot carries none of that. The Sora 10 at $449 quotes 6,800 GPH suction, a 7,800 mAh battery, up to 5 hours on a floor-only clean or about 4 hours for a full floor, wall and waterline pass, 150 micron filtration, coverage up to 3,229 sq ft (300 m2), 8.5 kg (18.74 lb) and a 2-year warranty. Nothing is plumbed in.
Navigation is the part a suction cleaner cannot match
A cleaner dragged by water flow cannot plan. It covers ground by persistence, revisiting the easy middle of the pool and missing corners it never happens to reach. Powered cleaners drive a deliberate path, and the better ones sense what is in front of them. The WYBOT C2 Vision Cordless Robotic Pool Cleaner at $629.99 adds an onboard AI camera with an AI visual algorithm for detection and avoidance, quoting up to 180 minutes in Eco mode, 3,883 GPH suction, a 180 micron cartridge plus a 10 micron ultra-fine HEPA filter, coverage up to 2,152 sq ft, and a 2-year limited warranty.
Which type fits your pool
If your pool already has a booster pump and a pressure-side cleaner that works, the case for replacing it is about labour and filter load rather than a dramatic energy saving. If you are starting from nothing, an electric robot avoids the second pump entirely, and the running-cost gap compounds every season.
Match coverage to surface area first: the models above range from 1,614 sq ft up to 3,230 sq ft per cycle, and buying under that line means two cycles instead of one. Choose corded for fixed timer cycles and no charge wait, cordless for nothing trailing in the water. Our guide to how robotic pool cleaners work and how to choose one covers filtration and drive systems in more detail.
Frequently asked questions
Is an automatic vacuum for pool cleaning really cheaper to run?
On the assumptions in the worked example above, a cordless robot's seasonal electricity is a couple of dollars, while a pressure-side setup driving a booster pump lands near two dozen. Substitute your own pump nameplate wattage and utility rate before trusting the ratio, since both vary widely. The direction of the answer holds even when its size moves.
What is the difference between a robot pool sweep and a robotic pool vacuum?
The terms are used loosely and often mean the same product. In practice a sweep describes a cleaner that agitates and lifts debris for the pool's filter to catch, while a vacuum captures and holds debris in its own filter. Every electric robot here is the second kind, which is why nothing it collects reaches your pump basket.
Does a cordless robotic pool vacuum need an outlet by the pool?
No. A cordless unit charges wherever you keep its charger, then goes in the water with no connection to anything. A corded model is different: its control box sits on the deck and needs a household outlet within reach of the cable, which on the Chasing Hydro 4 is 49.2 ft (15 m). Follow the installation instructions for outlet requirements.
Can an electric pool cleaner replace the filtration pump?
No, and it is not meant to. The pump circulates and sanitises the whole body of water, while the cleaner removes settled and floating debris from surfaces. What an electric cleaner does change is filter load, since debris it captures in a 150 or 180 micron cartridge never reaches your pump basket or filter media.
How long does one charge last on a cordless model?
It depends on the model and the mode. Published Eco-mode runtimes here run from up to 150 minutes on the WYBOT C1 and 180 minutes on the C2 Vision to 210 minutes on the S2, while the Sora 10 quotes up to 5 hours on a floor-only clean. Match that against a full pass of your pool.
Comparing the range before you buy
Energy is the small number, installed cost is the big one, and an electric pool vacuum removes the second pump from the equation entirely. Work the arithmetic with your own rate and pump nameplate, then match coverage to your pool. The full robotic pool cleaner range at RoboticsSelect shows current pricing across cordless and corded models, with free shipping, price matching and full manufacturer warranties.