Water Pump Uses and Functions Across Commercial and Strata Systems

How Water Pumps Work

At the core, water pumps are mechanical devices designed to move liquids by increasing pressure or displacement. They convert mechanical energy, usually from an electric motor, into hydraulic or kinetic energy that pushes water through a system. In practice, that means using mechanical energy to move water from one point to another, against gravity, against friction in the pipework, or against resistance further down the line.

The energy transfer mechanism differs by pump type, but it generally comes down to one of three components: an impeller, a piston, or a diaphragm. Each imparts velocity and pressure to the fluid passing through it, converting the motor’s rotation or reciprocating motion into the force that actually moves the water. In a multi-storey building, this energy has real work to do. A pump has to provide enough energy to overcome elevation, pressure requirements, and pipe friction all at once, including sustaining high pressure across many floors rather than just shifting volume at ground level, which is why the same amount of pump performs very differently depending on the building it’s installed in. What a pump depends on, mechanically, is the specific component generating that force, be it an impeller, piston or diaphragm.

Whatever the mechanism, the goal is the same: pump fluid from one point in the system to another, reliably and without damage to the equipment doing the work.



The Main Types of Water Pumps and How They Function

Not every pump moves water the same way. The mechanism behind a pump determines what it's suited for.



Centrifugal Pumps

A centrifugal water pump uses a rotating impeller to create pressure, converting rotational energy into centrifugal force that flings fluid outward against the pump casing and into the system. Such pumps are the most common type found in commercial and strata buildings, largely because proper maintenance is straightforward and they handle continuous operation well. One rule applies across the board: centrifugal pumps should never run dry, since running without water to move quickly damages the impeller and seals.



Positive Displacement Pumps

These operate on the positive displacement principle: rather than relying on rotational force, they trap a fixed volume of fluid and push it through the system, which means they can produce a constant flow rate regardless of pressure changes downstream, supporting maximum efficiency across variable demand. Common examples include rotary pump designs like gear pumps, which use meshing components instead of an impeller. Because of how they generate pressure, positive displacement pumps need a relief valve fitted at the pump outlet to prevent damage if it becomes blocked or restricted, and a properly functioning relief valve protects the pump's lifespan as much as it protects the piping downstream.



Diaphragm Pumps

Diaphragm pumps belong to the broader family of reciprocating pumps, using a flexible diaphragm moving back and forth inside the pump chamber to draw in and push out fluid. They excel at handling high viscosity fluids, which makes them useful for certain dosing and chemical-handling applications in chemical plants and other industrial sites, and they're also well suited to thick fluids and sludges that would strain a standard centrifugal design. Centrifugal pumps, by contrast, are generally the more efficient choice for low viscosity fluids like clean water, which is part of why they dominate general building water movement.



Jet Pumps

Jet pumps work on a different principle again, using suction lift to draw water up from a source below the pump via a venturi effect rather than sitting submerged in the fluid itself. They're less common in multi-storey commercial buildings than submersible or centrifugal types, but they still turn up in some transfer applications.



Submersible Pumps

Submersible pumps operate while fully submerged in water, which improves efficiency since the surrounding liquid helps cool the motor and there's no suction side to worry about: fluid enters the pump directly rather than needing to be drawn upward through a separate line. These turn up constantly as submersible sump pumps in basements and plant rooms, alongside broader stormwater systems and drainage applications.



Peristaltic Pumps

Peristaltic pumps push fluid through a flexible tube using a set of rollers inside the pump housing that compress the tube as they rotate. These are more specialised than the pump types above, mostly showing up in chemical dosing rather than general building water movement, and they need their tubing replaced as a routine part of maintenance since it's the component under constant mechanical stress.



Applications of Water Pumps in Commercial and Strata Buildings

Once you know how pumps generate movement, the next question is what they’re actually being asked to do on site. In a commercial or strata building, a handful of core applications of water pumps cover most of what pumps are installed for.



Booster Pumps: Boosting Water Pressure Through the Building

Water booster pumps exist to solve one specific problem: water pressure that’s fine at street level often weakens to low pressure by the time it reaches upper floors. In multi-storey buildings, boosting pressure through the plumbing system is one of the most common jobs a pump performs, keeping bathrooms, kitchens and common areas supplied with steady water flow no matter how high up they sit. A properly configured booster system doesn’t just push water upward: it has to maintain pressure consistently as demand shifts across dozens of fixtures at once. Lowara is one of the brands we supply for buildings that need to keep supplying water reliably under high pressure, alongside pressure and transfer applications more broadly.

Draining Stormwater and Construction Sites

Pumps play a defensive role too, moving excess water away from a site rather than delivering it somewhere useful. Stormwater pumps clear runoff from car parks, roofs and hardstand areas before it becomes a flooding risk, and high-capacity trash pumps are brought in to remove standing water and thick liquids mixed with debris from construction sites during a build. Portable trash pumps on these sites are often engine-driven rather than electric, running on diesel or gasoline engines so they can operate anywhere without mains power. Zenit is a brand well suited to this kind of stormwater and wastewater work.

Pulling Water From Below Ground

Submersible and groundwater pumps handle the opposite direction of travel, drawing water up rather than pushing it along. Because the pump sits fully submerged, pumping water this way avoids the suction losses a surface-mounted unit has to fight, which shows up as lower power consumption over the life of the system. This covers sump pumps preventing water buildup in basements, car parks and plant rooms, along with dewatering applications on commercial and construction sites. Some sump applications use pedestal pumps instead, where the motor sits above the waterline on a shaft while the impeller stays submerged, useful when servicing needs to happen without pulling the whole unit. Franklin Electric is one of the brands we supply for submersible and groundwater applications.

Circulating Water Through HVAC Systems

Circulation pumps are a function most people never think about, quietly moving hot or chilled water through a building’s HVAC system to heat or cool the space. Without a working circulation pump, a building’s heating and cooling system has no way to actually deliver that temperature-controlled water to where it’s needed.



Moving Sewage, Process Water and Industrial Fluids

Centrifugal pumps are commonly used to move sewage through a building’s waste system, coping well with continuous water flow carrying suspended solids. In industrial settings, pumps handle process water, cooling water and chemical solutions as part of standard operations, often feeding into broader wastewater treatment processes further down the line, and transporting industrial fluids that would otherwise have to be moved manually.



Choosing the Right Pump for the Job

With this many functions covered by “water pump” as a category, choosing the right pump system comes down to matching the pump to the job rather than picking based on size or price. Two factors matter most: flow rate and pressure needs, since undersizing either leaves a building under-serviced and oversizing wastes energy and money. That also means understanding how fluid flow behaves under different demand conditions, from sustaining high pressure across many floors to simply moving volume efficiently at a lower level. Matching a pump’s mechanism to what it’s moving matters just as much, since high viscosity fluids call for a different design than clean water does. Power source availability is also worth checking early, since not every plant room or pit has the electrical capacity already in place for a larger unit, and retrofitting that can add real cost to a project.



Keeping Pumps Running

Where a pump is used shapes how it should be maintained just as much as what type it is. Pump efficiency declines over time due to wear and tear, which is exactly why routine servicing exists. A few maintenance basics apply across most pump types: regular inspection of valves improves efficiency and catches problems before they cause a failure, positive displacement pumps need their relief valves checked to make sure they’re still doing their job, and centrifugal pumps need dry-run protection in place so an interrupted water supply doesn’t destroy the pump before anyone notices. None of this replaces a proper service schedule, but knowing what each pump type is sensitive to helps explain why servicing catches different things depending on what’s actually installed.

Frequently Asked Questions