The best flat suction pumps, compared.
Top pick: Einhell GC-SP 3580 LL Best value: Einhell GC-SP 3580 LL – Best value for a clear flat finish: about £47.99 and 4.5 from 6,700 reviews, with 8,000 L/h. The hose is extra, and some UK reviews report an EU plug. Updated 22.10.2026.
A flat suction pump is a submersible drainage pump for shallow standing water. The job is a thin residual film on a flat floor, often claimed at about 1 mm, so the last puddle can be wiped. In the UK, shoppers use one to empty a paddling pool or hot tub, to clear a flooded cellar, to drain a pond, or to move water from a butt or pit. You recognise a suitable pump by stable checks. The residual figure must separate manual flat mode from the cut-off of a float or sensor. The solids rating must match the water: clean-only for pools and clear spills, or a dual base for muddy pond or flood water. Maximum head, hose diameter and cable length have to cover the real lift, and a narrow hose cuts the headline flow. A mains unit should be 230 V with a BS 1363 plug, used through an RCD. Those checks are set out in the [flat suction pump buying guide](/hub/garden-watering/flat-suction-pump/sub/flat-suction-pump-buying-guide).
A flat suction pump is a submersible drainage pump for shallow standing water. The job is a thin residual film on a flat floor, often claimed at about 1 mm, so the last puddle can be wiped.
18 products checked · 56 hrs invested · +18,600 readers
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Personal buying guide
Question 1 of 2
What are you emptying?
Einhell’s 350 W clear flat suction listing is £47.99 on amazon.co.uk with 8,000 L/h, 7.5 m head and a 1 mm residual claim, plus a 5 m cord in the item highlight. Across 6,700 ratings the line is 4.5; UK reviews praise hot-tub and paddling-pool empties once a wide hose is fitted and the float is clipped for continuous run. Reviewers say automatic float cut-off sits much deeper than the 8 mm start / 1 mm residual wording, so the wipe-dry finish needs manual mode, not float-auto alone. A discharge hose is not in the box, and narrow garden hose or a kinked layflat hose cuts the flow. Several UK and Ireland reviews report a European plug on arrival even though the attribute block does not state BS 1363. Bottom suction can seal onto a soft liner or suck grit into the rotor, so keep the inlet clear and the pump off a soft floor. In this set it is the lowest-priced proven clear flat pump with the largest review file.
Pros
Cons
Best for: Paddling pools, hot tubs and clear shallow spills where you will buy a wide hose and run continuous mode for the last millimetres
Less suitable: Dirty pond or flood water with solids, buyers who need a stated UK plug in the attributes, or anyone trusting float-auto alone for a wipe-dry floor
Specifications
Common questions
Does it leave only 1 mm in automatic float mode?
The listing and UK reviews say the 1 mm residual is for low-level pumping; automatic float cut-off is much higher. Reviewers clip the float for continuous run to finish shallow water.
Is a discharge hose included?
The listing does not include a hose in the components. UK reviews say you need to supply a suitable wide hose and fittings.
Is a UK plug guaranteed?
The attribute block does not state a BS 1363 plug. Several UK and Ireland reviews report a European plug on arrival.
The Einhell GE-DP 7035 LL Dual is £68.98 for 700 W, 16,000 L/h, 7 m head, dirty solids to 35 mm and a 1 mm flat claim via a rotatable base. Across 551 amazon.co.uk ratings the line is 4.4; UK reviewers call it strong for ponds, fields, basements and pool work, and they like the 10 m cord in the item highlight. In 1 mm mode the bottom plate needs a hard base or suction can seal and block the inlet — a soft pool floor is a common complaint. One large-pool user reported residual closer to about 2 cm than a wipe-dry film, so treat the millimetre claim as best-case on a suitable surface. Hose is not stated as included; adapters are claimed in manufacturer text. Some marketplace bullets describe a wet-dry vacuum and conflict with the pump title — ignore those for features. In this set it is the mid-price Dual with the strongest review volume among mixed clean/dirty flat pumps.
Pros
Cons
Best for: Mixed UK garden jobs — muddy pond or flood water plus a flat finish — when you already have hose and a firm base for low-level mode
Less suitable: Buyers who only empty clear pools and want the cheapest clear flat pump, or soft liners where the inlet seals shut
Specifications
Common questions
Can it handle dirty pond water and still finish flat?
Manufacturer text rates dirty water to 35 mm solids and flat suction to 1 mm via the rotatable base. UK reviews use it for ponds, sumps and pools.
How long is the power cable?
The item highlight states a 10 m cord.
Will the base seal on a soft floor in 1 mm mode?
A UK review says the bottom plate needs a hard base at 1 mm or suction can block the inlet.
Kärcher’s SP 16.000 Dual is £99.00 with 16,000 L/h, 7 m head, dirty solids to 20 mm and a 1 mm flat claim via the filter basket. Across 39 amazon.co.uk ratings the line is 4.4; UK buyers praise fast pool, pond and flood clearing when hose and clip stay fitted. The plastic hose clip is easy to knock off when you lower the pump — without it the elbow will not hold under pressure. Flat-mode adjustment can feel clunky, and the float can cut out early unless you set or fix it for continuous run. No hose is in the box; Quick Connect and a G1 thread are. Narrow garden hose via adaptors throttles real flow far below the headline figure. The review sample is thinner than the Einhell Dual row, so treat stars as directionally useful rather than settled. In this set it is the premium brand Dual for shoppers who want the Kärcher filter-basket layout and will buy hose and a spare clip.
Pros
Cons
Best for: Brand-led Dual buyers emptying ponds, pools or shallow floods who will fit a proper wide hose and keep the outlet clip safe
Less suitable: Tight budgets, buyers who want the thickest UK review file, or anyone expecting headline L/h on a thin garden hose
Specifications
Common questions
What particle size can it pass in dirty mode?
The listing states dirty water with particles up to 20 mm, with a separate flat pick-up setting for 1 mm residual.
Is a hose included?
No. Scope of delivery names Quick Connect and a G1 thread. UK reviews buy separate hose and adaptors.
Why might the outlet come off in use?
UK reviews warn the plastic hose clip can knock off when lowering the pump; without the clip the elbow will not stay under pressure.
VEATON’s FSP750C-A is £69.99 for a 750 W sensor pump with 13,000 L/h at 0 m head, 9 m max head and an 8 m cable. Residual claims are about 5 mm with the strainer fitted, or 1 mm without the strainer in clean water only. Across 14 amazon.co.uk ratings the line is 4.0; UK reviewers praise lift for short rises, fast container emptying and auto stop when water is gone. Automatic start with the strainer is about 2.5 cm when water contacts the probes — residual depth is not the start level. Hose adapters and a rope are in the box; the hose is not. It is less versatile than true clean/dirty Duals with a solids millimetre rating, so muddy pond water needs care and the strainer left on. In this set it is the sensor-led low-suction option for shallow auto work rather than the Dual pick for dirty free passage.
Pros
Cons
Best for: Shallow sumps, rainwater transfer and clean low-level empties where sensor auto stop matters more than 35 mm dirty solids
Less suitable: Muddy ponds or flood grit that need a Dual dirty base, or buyers who want thousands of UK reviews behind the listing
Specifications
Common questions
What residual water should I expect?
Bullets state about 5 mm with the strainer fitted, or 1 mm without the strainer in clean water only.
Is the hose included?
No. Hose adapters and a rope are included; the hose is not.
When does automatic mode start?
With the strainer fitted, bullets say it starts at about 2.5 cm when water contacts the probes. Residual depth is not the start level.
Gardena’s 20000 BASIC 2-in-1 is £59.99 with a 20,000 L/h claim, dirty solids to 35 mm, a 1 mm residue claim and a UK plug named in the title (09018-28). Only three amazon.co.uk reviews average 3.5, so the star line is too thin to treat as settled proof. The small UK sample likes sturdy build, adjustable base height and fast flow, including moving water about 15 m away in one report. No pipe is included — only 25 mm and 38 mm connections — so you still buy hose separately. One of the three reviewers reported scratches and felt the unit looked used on arrival. Max head is not stated on the listing, which leaves lift planning incomplete. In this set it is the named-UK-plug Dual at mid price, bought for the plug and brand more than for review confidence.
Pros
Cons
Best for: Buyers who specifically want a Gardena Dual with a UK plug named on the listing and will accept a thin review file
Less suitable: Anyone who needs thick UK review evidence before buying, or a pump that ships ready with discharge hose
Specifications
Common questions
Does the title promise a UK plug?
Yes. The amazon.co.uk title includes UK plug (09018-28).
Is a pipe or hose in the box?
No. Connections are included; UK reviews say no pipe is included.
How strong is the review sample?
Only three amazon.co.uk reviews are on the Customer Reviews line, so treat star averages as thin.
The published score on each row is the amazon.co.uk star rating times 20, taken from the saved listings. It is not a laboratory test and not a measured flow. The top pick and the best value follow the scoring note: residual fit and review volume, not the raw star figure alone. Price sits outside that score. The weights below are the order used to read a listing. They sum to 100.
Residual water and mode
30%The millimetre claim only counts in the mode that reaches it. Manual or continuous flat running is not the same height as float or sensor cut-off.
Clean or dirty solids
25%Clean-only suits pools and clear spills. Muddy water needs a stated free passage or a dual base. A solids rating is not a sewage rating.
Head, hose and cable
20%Headline litres per hour are usually at near-zero head. Lift, hose diameter and cable length decide whether that figure is usable on the job.
UK electrical fit
15%A mains pump should be 230 V with a BS 1363 plug, used on an RCD. A Schuko-only lead is a buying problem, and the listing must be checked.
Review evidence
10%Star ratings and review counts come from amazon.co.uk. A large sample is stronger evidence than a similar star line from a handful of reviews. Thin samples stay visible.
Choose the residual mode first, then the solids rating, then the real lift. A 1 mm claim in float-auto is the usual miss, and a narrow hose will not deliver the headline litres per hour. Price bands on these amazon.co.uk listings sit roughly from the mid-£40s into the £90s before you buy hose and clips.
A flat suction pump is a corded submersible built to finish shallow water, not to feed a sprinkler. Ordinary drainage pumps often stop when several centimetres remain. A flat-suction listing claims a much lower residual, commonly about 1 mm, so a floor, pool or tub can be wiped rather than baled. That claim is only as good as the mode you use. Manual or continuous running, with the float clipped or fixed, is what listings and reviews associate with the last millimetres.
Listings and UK reviews separate the flat residual from the float cut-off. Clipping the float is how reviewers finish shallow water. A sensor start depth is also not the residual depth.
Litres per hour are usually at near-zero head. A long lift or a narrow garden hose cuts the flow. These boxes do not include the discharge hose.
A clean-water pump can jam on grit. A flat inlet can seal on a soft liner. Some UK deliveries arrive with a European plug even when the attributes do not state one. Check the box.
The first check is the residual height and the mode that produces it. Manual or continuous running, with the float clipped or fixed, is the path listings and reviews tie to a film of about 1 mm. Automatic float cut-off, and the water level that wakes a sensor, sit higher. One sensor listing starts at about 2.5 cm with the strainer fitted, while the residual with that strainer is about 5 mm and the 1 mm path is clean water with the strainer off.
Clean-only flat pumps are for pools, hot tubs and clear spills. Dirty or dual pumps state a free passage, in this category about 20 mm or 35 mm, and switch to a flat base or filter setting for the finish. That passage is still not sewage. Headline flow is the near-zero-head figure. Read maximum head, hose diameter and cable length against the lift you actually have. A mains pump should be 230 V with a BS 1363 plug, on an RCD of 30 mA or less. Do not assume the plug from the marketplace alone.
Three typical situations, each with a recommendation from this comparison.
You are emptying a paddling pool, hot tub or clear spill and you will fit a wide hose yourself. The Einhell GC-SP 3580 LL is the clear-water flat listing at about £47.99, with 8,000 L/h, a 7.5 m head and 4.5 from 6,700 reviews. Clip the float if you want the last millimetres. Skip it for grit.
The water is muddy and you still want a flat mode for the finish. The Einhell GE-DP 7035 LL is the top pick: 16,000 L/h, solids to 35 mm, a 1 mm flat claim and a 10 m cord highlight, at about £68.98 with 4.4 from 551 reviews. It needs a firm base in flat mode.
You want a sensor to stop when shallow clean water is gone, more than a 35 mm dirty passage. The VEATON FSP750C-A lists 13,000 L/h at 0 m, a 9 m head and an 8 m cable, at about £69.99. Residual with the strainer is about 5 mm. The hose is extra, and the review file is 14 ratings.
The top pick is the Einhell GE-DP 7035 LL at about £68.98: a dual pump with 16,000 L/h, solids to 35 mm, a 1 mm flat claim and a 10 m cord highlight, with 4.4 from 551 amazon.co.uk reviews. The best value is the Einhell GC-SP 3580 LL at about £47.99, with 8,000 L/h and 4.5 from 6,700 reviews, for clear water only. Neither ships a hose, and float-auto is not the same as the 1 mm finish.
Einhell GC-SP 3580 LL
Best value for a clear flat finish: about £47.99 and 4.5 from 6,700 reviews, with 8,000 L/h. The hose is extra, and some UK reviews report an EU plug.
Editorial
Peter F. is the editor for DIY & tools at productscompared.co.uk. Comparisons in this category are checked against amazon.co.uk listings, review evidence and public UK sources.
Guides on what to look for, how to use a product, and common mistakes.
Public UK sources and the saved amazon.co.uk listings for this set, checked on 21 October 2026.
This page contains affiliate links to amazon.co.uk. If you buy through them, we may earn a commission at no extra cost to you. Prices, star ratings and review counts come from the saved amazon.co.uk listings. This is not a laboratory test.
