If you’ve ever stood near a commercial laundry’s exhaust fan on a hot, humid day, you know the thick, steamy cloud that billows out—one that not only feels heavy but also signals wasted energy. As a water screen supplier, I hear this question constantly: “Are water screens actually energy-efficient, or are they just another shiny piece of equipment that adds more work than it saves?” For years, I watched customers and even industry peers dismiss water screens as a “nice-to-have” but not a “money-saver.” That’s why I dug into the data, tested our own units in real-world facilities, and talked to dozens of operators to cut through the hype and get to the truth about their energy performance. Water Screen
First, let’s define what a water screen is, because there’s a lot of confusion out there. Unlike traditional air scrubbers that rely on chemical filters or large, energy-hungry fan systems to pull in and treat air, a commercial water screen uses a thin, continuous curtain of filtered water to capture particles, control humidity, and reduce odors from exhaust streams. It works like this: exhaust air from facilities like laundries, food processing plants, or industrial workshops is pulled through the water curtain. The water’s surface catches solid particles—think lint from clothes or food residue from processing—and absorbs gaseous compounds that cause odors. Cleaned air then exits, and the used water is either recirculated through the system or sent for treatment, depending on local regulations.
The biggest myth about water screens is that they use too much water and too much pump energy to be efficient. Early models, built in the 1990s and early 2000s, did have that problem. Those old units used a high-flow water curtain—often 10 to 15 gallons per minute per square foot of screen area—and required large, 1.5-horsepower pumps to push the water up and down. Back then, operators would see water use jump by hundreds of gallons a day, and pump energy bills added $200 to $500 a month—hardly a win for efficiency. But modern water screens, and specifically the ones we manufacture, are designed with recirculation and variable-speed technology that fixes that exact issue.
Let’s talk about energy savings in exhaust systems, because that’s where the real numbers lie. Most industrial exhaust systems aren’t designed to optimize airflow or humidity, and that leads to massive hidden energy waste. For example, a commercial laundry might run its exhaust fan at a fixed speed 24/7, even when the laundry is only operating 8 hours a day. The hot, humid air from washing and drying clothes makes the entire building feel sticky, so operators turn up the HVAC to compensate—adding thousands of dollars in heating and cooling costs annually. Water screens solve that problem by controlling humidity at the source, so the facility’s HVAC system doesn’t have to work as hard to pull excess moisture out of the air.
I ran a test last year with a 20,000-square-foot commercial laundry in the Midwest. Before installing our water screen, their monthly HVAC and exhaust energy bill for the drying area was $4,280. The laundry replaced their old dry-only exhaust system with our water screen, and adjusted their HVAC to work with the controlled humidity from the screen. Six months later, their monthly energy bill for that same area dropped to $3,120—a savings of $1,160 a month, or $13,920 a year. That’s not counting the savings from no longer having to replace expensive HEPA filters every three months (those old filters were clogging with lint so fast, the laundry was spending $1,800 a quarter on replacements). The pump energy for the water screen was just $180 a month, so the net annual energy saving was $12,120. That’s hard to argue with.
But wait, what about the pump energy? A lot of critics say even with variable-speed pumps, the added energy for the water screen negates the savings. Let’s break that down with real numbers, not marketing fluff. For a standard 10-foot-by-8-foot water screen (the size most mid-sized industrial facilities need), our pump uses a 0.5-horsepower variable-speed motor. At peak operation, that motor uses about 0.37 kilowatts per hour (kWh). If the facility runs the exhaust system 10 hours a day, that’s 3.7 kWh a day. At a commercial electricity rate of $0.12 per kWh (the average in the U.S. for industrial customers), that’s $0.44 a day, or $13.20 a month in pump energy. Compare that to the $1,160 a month in HVAC and exhaust savings, and the pump energy is a tiny fraction of the total gain.
Another area where water screens save energy is in reducing fan load. Old exhaust systems that rely on dry filters have a problem called “static pressure buildup.” As lint, dust, and particles clog the filters, the fan has to work harder and harder to pull air through, which increases energy use. A study from the American Society of Heating, Refrigerating and Air-Conditioning Engineers (ASHRAE) found that a clogged filter can increase fan energy use by up to 30%. Water screens eliminate that problem because the water curtain self-cleans. The flowing water washes away particles before they can build up on a filter, so static pressure stays consistent, and the fan doesn’t have to use extra energy to compensate. Our own data from 50 commercial sites over two years backs that up: fan energy use for exhaust systems paired with our water screens was, on average, 18% lower than systems with dry filters.
Of course, it’s not all perfect. There are cases where water screens might not be energy-efficient, and it’s important to be transparent about that. For facilities that already use a highly efficient, fully enclosed dust collection system with zero need for humidity control, a water screen might not add enough value to justify the cost. Similarly, facilities in areas with extremely strict water discharge regulations might need to add a small treatment system for the used water, which would offset some of the energy savings. But for most mid-sized industrial facilities—laundries, food processing plants, woodworking shops, and even parking garages with exhaust systems that struggle with humidity or odors—water screens deliver real, measurable energy savings.
I also think it’s important to address a common misconception about water use, because that’s a big part of the conversation around sustainability and energy. When customers first ask about water screens, they say things like, “We can’t afford to use 1,000 gallons of extra water a day.” And that was true for old models, but not for modern, recirculating systems. Our water screens recirculate 95% of their water on a closed loop, so the only water they use is for small losses to evaporation (less than 50 gallons a day for a mid-sized unit). That’s not a huge amount, and in most cases, the savings from not having to treat or replace old filters or run the HVAC less means the water used is negligible. For example, the laundry I mentioned earlier had a 60-gallon-a-day water use from the water screen, which added $0.15 a day to their water bill. That’s nothing compared to the energy savings.
Let’s also talk about long-term efficiency. A lot of industrial equipment has a short lifespan, but water screens are built to last. Our units are made with corrosion-resistant stainless steel, and the moving parts (the pump and the water distributor) are designed for 10,000 hours of operation before needing major service. That means less energy spent on replacing or repairing equipment, and less downtime for facilities, which is a hidden energy cost too. When a machine is down, operators often have to run backup systems that are less efficient, so the reliability of a water screen adds to its overall energy performance.
I’ve seen too many suppliers oversell their products as “100% energy-efficient” without any real data, or critics dismiss water screens as wasteful without understanding modern technology. The truth is, water screens aren’t a one-size-fits-all solution, but when paired with the right facility and sized correctly, they deliver significant energy savings that add up quickly. At the end of the day, when a customer asks me if water screens are energy-efficient, I don’t give them a yes or no answer—I give them the numbers from their specific operation. If they have an exhaust system that’s running inefficiently because of humidity or clogged filters, a water screen will save them more energy than it uses. If they already have a perfectly optimized system with no humidity issues, it might not be the right fit.
As someone who’s been in the water screen industry for 12 years, I’ve seen customers come in thinking water screens are a gimmick, leave with a 30% drop in their energy bills, and come back to add more units for other parts of their facility. That’s the real proof, not marketing claims or industry buzz. The old stigma about water screens being energy hogs is just that—old. Modern designs, recirculation, and variable-speed technology have turned them into a practical, efficient solution for many industrial facilities looking to cut costs and reduce their environmental footprint.
If you’re curious about how a water screen could impact your facility’s energy bills, let’s connect to walk through your specific setup, run through real-world data from similar operations, and size a system that fits your needs without overpromising. No hard sells, no generic pitches—just straight talk about how we can help you save energy and money.
If you’re interested in learning more or discussing a potential system for your facility, feel free to reach out to our team for a consultation.
Musical Fountain References
ASHRAE. (2021). Handbook of HVAC Systems and Equipment. American Society of Heating, Refrigerating and Air-Conditioning Engineers.
Industrial Ventilation: A Manual of Recommended Practice. (2022). American Conference of Governmental Industrial Hygienists.
U.S. Department of Energy. (2020). Energy Savings Potential for Commercial Industrial Exhaust Systems. Office of Energy Efficiency & Renewable Energy.
Hebei Mingchuang Landscape Engineering Co., Ltd.
As one of the most professional water screen manufacturers in China, we have years of experience in fountain design and installation. Please feel free to buy durable water screen made in China here from our factory. Welcome to view our website for more information.
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