By Shaz · Updated September 2026
Robotic vs Pressure vs Suction Pool Cleaners: Which Is Best?
Automatic pool cleaners come in three main types — suction-side, pressure-side and robotic — and they are not created equal. They differ in how they're powered, how well they clean, how much they cost to run, and how much of your pool's plumbing they rely on. This guide breaks down all three in plain terms so you can choose the right one for your pool, your budget and how much maintenance you're willing to do. Short answer: For most pool owners, a robotic pool cleaner is the best all-round choice — it cleans the floor, walls and waterline, uses the least energy, filters independently of your pool system, and needs no extra plumbing. Suction and pressure cleaners cost less upfront but rely on your pump, clean less thoroughly, and cost more to run over time.The Three Types of Automatic Pool Cleaner
Suction-side cleaners
A suction-side cleaner connects to your pool's existing suction line (usually the skimmer) and uses the pull of your circulation pump to move around and vacuum debris. The dirt goes into your pool's filter, not the cleaner.- Powered by: your existing pool pump
- Best at: picking up small-to-medium debris on the floor
- Trade-off: adds load to your pump and filter, moves semi-randomly, and struggles with walls and large debris
Pressure-side cleaners
A pressure-side cleaner uses pressurised water — often from a dedicated booster pump — to drive itself and to blow debris up into its own attached bag. Because debris bypasses your pool filter, it eases some filter load, but the booster pump adds significant energy use.- Powered by: return line, usually with a separate booster pump
- Best at: handling larger debris like leaves and acorns
- Trade-off: highest energy use of the three, extra plumbing/pump to install and maintain
Robotic cleaners
A robotic cleaner (such as a Dolphin by Maytronics) is fully self-contained. It plugs into a standard outlet through a low-voltage transformer and runs completely independently of your pool's pump and filter, using its own motors, brushes and onboard filter basket. For a deeper look at the mechanics, see our guide on how Dolphin robotic pool cleaners work.- Powered by: its own 24V motor via a wall outlet — no pool plumbing needed
- Best at: everything — floor, walls, waterline, fine and large debris, active scrubbing
- Trade-off: higher upfront price (offset by lower running costs)
Head-to-Head Comparison
| Factor | Suction-Side | Pressure-Side | Robotic |
|---|---|---|---|
| Upfront cost | Lowest | Medium–High (+ booster pump) | Highest |
| Running cost / energy | Medium (uses pump) | Highest (booster pump) | Lowest (24V motor) |
| Cleans walls & waterline | Limited | Limited | Yes |
| Active scrubbing brushes | No | Basic | Yes |
| Own filter (spares your pool filter) | No | Partial | Yes |
| Extra plumbing / pump needed | No | Often yes | No |
| Navigation | Semi-random | Semi-random | Smart mapping (CleverClean) |
| Strain on pool system | High | Medium | None |
Cleaning Performance
This is where robotic cleaners pull clearly ahead. Suction and pressure models mainly work the floor and move in semi-random patterns, so coverage is inconsistent and walls and the waterline are often neglected. Robotic cleaners use smart scanning to map the pool and cover it systematically, climb walls on rubber tracks, and use active brushes that physically scrub algae and biofilm off surfaces rather than just vacuuming loose dirt.Running Costs & Energy
Upfront price only tells half the story. A pressure-side cleaner with a booster pump is the most expensive to run, and a suction-side cleaner still relies on your main pump running longer. A robotic cleaner uses a low-voltage motor that can consume up to 90% less energy than a pressure system — so the higher purchase price is steadily offset by lower electricity bills, fewer chemicals and reduced wear on your pool equipment.Installation & Maintenance
Setup
Suction and pressure cleaners must be connected to your pool's plumbing (and pressure models may need a booster pump installed). A robotic cleaner needs nothing but a nearby outlet — drop it in and press start.Upkeep
Suction/pressure models send debris into your pool filter or a bag you empty. Robotic cleaners have a top-loading basket you rinse after each cycle — quick and hygienic, and it keeps debris out of your pool's filter entirely.Which Type Should You Choose?
- Tightest budget, simple needs: a suction-side cleaner is the cheapest way to automate basic floor cleaning.
- Heavy leaf load, existing booster pump: a pressure-side cleaner handles big debris well.
- Best overall cleaning, lowest running cost, least hassle: a robotic cleaner — the right choice for the large majority of pool owners who want a genuinely clean pool with minimal effort.
Frequently Asked Questions
Are robotic pool cleaners better than suction or pressure cleaners?
For most pools, yes. Robotic cleaners clean the floor, walls and waterline, scrub with active brushes, filter debris independently of your pool system and use the least energy. Suction and pressure cleaners are cheaper upfront but clean less thoroughly and cost more to run.Do robotic pool cleaners use a lot of electricity?
No. They run on a low-voltage 24V motor and can use up to 90% less energy than a pressure-side cleaner with a booster pump, adding only a small amount to your electricity bill per cycle.Does a robotic cleaner need a booster pump or extra plumbing?
No. Unlike pressure-side cleaners, a robotic cleaner is self-contained and plugs into a standard outlet. It needs no connection to your pool's pump or plumbing.Will a suction or pressure cleaner strain my pool pump?
Suction-side cleaners add load to your main pump and filter, and pressure-side models often require a separate booster pump. A robotic cleaner puts no additional strain on your pool's circulation system.Which type is cheapest overall?
Suction-side cleaners are cheapest to buy, but robotic cleaners are often cheapest over their lifetime once you factor in lower energy use, reduced chemical needs and less wear on your pool equipment.Models in this guide:
- Dolphin Nautilus CC Plus Wi-Fi — full review & specs
- Dolphin E30 — full review & specs
- Dolphin S300 — full review & specs
Browse all Dolphin models or see every comparison.