Electric Pumps

Electric water pump — what it is

An electric water pump moves liquid with an impeller driven by a motor on a 230V or 400V supply. The most common design is the submersible pump — lowered directly into the water, rated IP68 (fully sealed for continuous submersion). Unlike an engine-driven water pump, it needs no refuelling, so it suits permanent installation in a well, septic tank or cellar.

The NORWIT.PL range includes electric water pumps primarily from Wacker Neuson, Enar and Master Heaters — from clean-water models to designs resistant to sand, silt and small stones. Equipment from these manufacturers is on the brand pages Wacker Neuson, Enar and Master Heaters. Below: the difference between clean-water, dirty-water and sludge pumps, and how to choose the right power and voltage for the job.

Types — clean-water, dirty-water and sludge pumps

Suitability depends on the size of solid particles the impeller can pass: around 5 mm in clean water, 20–35 mm in dirty water, up to 30–50 mm in electric sludge pumps with a wear-resistant cast-iron housing.

230V or 400V — sizing an electric water pump

Power is matched to the total head (the level difference between the water surface and the discharge point, from a few metres up to 40 m) and to the discharge hose length, since friction in the pipe reduces output with distance. Flow rate in this category ranges from around 100 to over 2,000 l/min.

A 400V supply is chosen above roughly 500–1,000 l/min, or when the site already has a three-phase connection — such a pump empties a deep excavation or large tank faster.

Electric pump or engine-driven pump — the differences

Both designs move water, but differ in power source. An electric pump needs a 230V or 400V supply, though it is quiet and stays permanently submerged. An engine-driven water pump has a petrol or diesel engine, works independently of the mains, but needs refuelling (a tank lasts 2–6 hours) and must run outdoors because of the exhaust.

For a permanent well or pumping-station installation, choose an electric pump — it switches on automatically via a float switch. When there is no power on site, an engine-driven water pump is the better choice.

Dewatering excavations

A dirty-water or sludge pump is the standard tool for dewatering foundation excavations, cellars flooded after a failure, and for cleaning septic tanks and settling tanks. An impeller for 20–35 mm particles (up to 30–50 mm in the sludge version) handles the sand and silt carried by the water, and a total head of up to several dozen metres empties even a deep excavation. It starts manually or automatically via a float switch, which turns the pump on once the water reaches a set level.

After working in water with sand or sludge, flush the pump with clean water for 1–2 minutes before lifting it out. Every few dozen to a few hundred running hours, check the mechanical seal, float switch and power cable for wear, and store the pump in a dry place during longer standstills.

Frequently asked questions about electric water pumps

Why buy electric water pumps at NORWIT.PL

For electric water pumps, we rely on proven brands: Wacker Neuson, Enar and Master Heaters for clean and dirty water, plus Evak and Toolsa in electric sludge pumps. We advise on the right power, voltage (230V or 400V) and total head for the job. When mains independence matters, check our water pumps and engine-driven pumps. Orders are placed online, with nationwide shipping.