When people think of flood protection they picture barriers, doors and sandbags, but water pumps are the unsung heroes. No matter what barrier you use, some water will always find a way through, whether that is seepage through walls, groundwater rising, or simply rainwater landing behind the barrier.
Choosing the right type of flood pump is one of the biggest differences between a dry home and a very stressful insurance claim. After surveying hundreds of flooded properties across the UK, we see the same mistake over and over: people buy the wrong pump for the job. Here is a simple, no-nonsense guide to the three main types of pump used in flood protection, and how to choose the right one. If you would rather jump straight to specific products at each budget, see Your Ultimate Guide to Flood Pumps.
1. Puddle pumps
Best for: pumping shallow water. Think: seepage, rainwater on floors, flood water leaking in.
Puddle pumps can clear water down to very low levels, much lower than a standard sump pump, which makes them ideal for:
- Water sitting on flat floors
- Small leaks
- Seepage through the ground or the walls
- Cleaning up after a flood
They are lightweight, portable, and need no chamber or pre-installation work. You simply drop one into the water and away it goes.
Good to know: puddle pumps run with very little water around them, but they do not always have the highest flow rates. They are perfect for mopping up, not for moving huge volumes fast. Browse our puddle pumps, or read what is a puddle pump for more.
2. Submersible (sump) pumps
Best for: groundwater, basements, long-term protection and installations. Think: part of your permanent flood resilience setup.
A sump pump sits inside a chamber, and automatic versions work using a float switch. When water levels rise, the pump kicks in and moves the water away before it reaches floor level. Sump pumps are great for:
- Groundwater entering basements
- Seepage rising through cracks and joints
- Keeping cellars dry
- Managing rainfall that collects behind flood barriers
- Passive flood defences, installed in chambers with automatic float switches
They typically have higher flow rates than puddle pumps and are extremely reliable when installed properly. For most homes with flood or groundwater issues, a packaged pump station is the gold standard.
Important: a sump pump must be submerged to stay cool. It cannot run dry, so it needs a proper chamber. See our submersible pumps.
3. Engine-driven pumps
Best for: large volumes of water, outdoor use, and areas with no power. Think: emergency backup during storms or power cuts, or rural areas off the mains.
Engine pumps move a lot of water very quickly. Because they run on petrol or diesel, they are ideal when:
- Power may fail, which often happens in storms
- You need to drain a garden, yard or large area fast
- You are working in a remote or rural location
If your property relies heavily on electric pumps, it is wise to keep an engine pump as a backup. If the power goes out, your whole flood system is useless without one.
Important: engine pumps cannot be used indoors, due to fumes and fire risk, and they are noisier than the other two types. They also usually require priming and more oversight. See our engine-driven pumps.
So which pump do you actually need?
Most homes benefit from a combination:
- Sump pump: installed protection for groundwater and seepage.
- Puddle pump: quick response for surface water and post-flood clean-up.
- Engine pump: backup when the power fails, or when you need high flow fast.
If you only choose one, make sure it suits the type of flooding you actually experience, not the one that looks cheapest or most powerful on paper. For specific models at each budget, see Your Ultimate Guide to Flood Pumps, or use the Pump Finder.
