Last updated: 23 March 2026

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Robotic vs Suction Pool Cleaners: The Honest Comparison

Two technologies, two philosophies, one goal: a clean pool without you doing the work. Robotic cleaners are the premium option with their own brain, motor and filter. Suction cleaners are the budget option that borrow your pump's power. We ran both types in the same pool for 4 months, measuring debris pickup, energy consumption, noise levels and water clarity after each cycle. Here is what the data says.

4 monthsSide-by-Side Test
7p vs 37pCost Per Cycle
50 vs 100+Micron Filtration

Technology Comparison

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Robotic Cleaners

How: Self-contained unit with motor, pump, filter. Runs on 24V DC. Cleans: Floor, walls, waterline (model dependent). Filtration: 2 to 50 microns (onboard filter). Energy: 150-200W, costs 7p-10p per cycle. Noise: Near-silent. Price: £499 to £1,500.

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Suction Cleaners

How: Connects to skimmer, uses pool pump suction. Cleans: Floor, partial walls. Filtration: 100+ microns (pump basket only). Energy: Uses your 1.5 kW pump, costs 37p-50p per cycle. Noise: Pump noise (65-75 dB). Price: £149 to £400.

5-Year Total Cost of Ownership

Robotic (Dolphin E20): £649 + £25/yr filters + £5/yr electricity = £774 over 5 years

Suction (Zodiac MX8): £349 + £0 consumables + £97/yr electricity + £50/yr pump wear = £1,084 over 5 years

The cheaper cleaner costs £310 more to own over 5 years. The robot wins on total cost.

"Suction cleaners add 30 to 40% more wear to your pool pump compared to normal filtration cycles. That accelerates pump replacement from 8-10 years to 5-7 years. Factor in a £400 to £600 pump replacement when calculating suction cleaner costs."
— Neil Mayoh, technical standards manager at ISPE
Top 5 Pool Cleaners Dolphin vs Zodiac All Types Compared Buying Guide

Frequently Asked Questions

Q What is the main difference between robotic and suction pool cleaners?
A robotic cleaner has its own motor, pump and filter. It runs independently on low voltage. A suction cleaner connects to your pool skimmer and relies on your existing pool pump for power. Robotic cleaners are more expensive to buy but cheaper to run and deliver better cleaning results.
Q Which type saves more money long term?
Robotic cleaners save significantly on electricity. A robotic cleaner costs £5 per season to run vs £97 for a suction cleaner (which runs your pool pump for 3+ hours per clean). Over 5 years, the robotic cleaner saves £460 in electricity, more than offsetting its higher purchase price.
Q Can I use both types in the same pool?
Yes. Some pool owners use a suction cleaner for quick daily maintenance and a robotic cleaner for deep weekly cleans. This is particularly useful during autumn leaf fall when the suction cleaner handles the bulk debris and the robot finishes with fine particle filtration.
Q Which is better for a small pool?
For pools under 8 metres, either type works well. A suction cleaner is the most cost-effective choice. For pools 8 to 15 metres, a robotic cleaner delivers noticeably better results. For pools over 15 metres, robotic is strongly recommended due to independent filtration and lower pump wear.
Tom Bradshaw
Tom Bradshaw
Pool Maintenance & Automation Specialist

Tom has spent 7 years testing pool cleaning equipment in the UK. A former pool technician with ISPE certification, he has tested over 30 robotic pool cleaners across in-ground and above-ground pools. His reviews are based on real cleaning cycles, debris pickup tests and long-term reliability tracking through British seasons.

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Still deciding? The Dolphin S200 is our top recommendation for most UK homes.

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