Global Marine Scrubber Systems Market Outlook, 2031

The global marine scrubber systems industry covers exhaust gas cleaning systems installed on ships to remove sulphur oxides, and to some extent particulate matter, from engine and boiler exhaust, allowing vessels to continue burning cheaper high-sulphur fuel oil while complying with sulphur limits. Under MARPOL Annex VI, the International Maritime Organization's global sulphur cap of 0.50% took effect in January 2020, and emission control areas require 0.10% sulphur. Scrubbers spray seawater or alkaline water into the exhaust to absorb sulphur dioxide. Open-loop scrubbers use seawater and discharge the washwater back to the sea after treatment; closed-loop scrubbers use freshwater dosed with caustic soda and recirculate it, producing smaller discharge volumes and sludge; hybrid scrubbers can switch between modes. Scrubbers are installed on container ships, bulk carriers, tankers, cruise ships, car carriers and ferries, both as retrofits and on newbuilds. Major suppliers include Wärtsilä, Alfa Laval, Yara Marine Technologies, Valmet, Clean Marine, Fuji Electric, Panasia, Ecospray, Andritz, Hyundai Heavy Industries' HiMSEN and Korean and Chinese suppliers such as Doosan Lentjes, Saacke, PureteQ and Ecopro. More than 5,000 ships have been fitted with scrubbers, accounting for a large share of global bunker demand for high-sulphur fuel oil.

Scrubber installations surged in 2018 and 2019 ahead of IMO 2020, then slowed as the price spread between high-sulphur fuel oil and very low sulphur fuel oil narrowed during the pandemic. When energy prices rose in 2022, the spread widened again, improving scrubber economics and reviving orders, particularly for large container ships, tankers and bulk carriers. The market is now shaped by regional regulations and decarbonisation. The Mediterranean Sea became an emission control area for sulphur from May 2025, requiring ships to burn 0.10% sulphur fuel or use scrubbers, which increased the value of scrubbers for ships trading there. The Canadian Arctic and Norwegian Sea emission control areas entered into force in March 2026, with the 0.10% sulphur limit applying from March 2027, and a North-East Atlantic emission control area is under consideration at the IMO. At the same time, restrictions on open-loop scrubber washwater discharge are spreading: many ports in Europe, the Middle East and Asia ban open-loop use, and in July 2025 the OSPAR Convention parties agreed to ban open-loop discharge in their waters from July 2027 and all scrubber discharge in inland waters and ports from 2029. Decarbonisation adds uncertainty: the IMO failed to adopt its Net-Zero Framework in October 2025 and adjourned for 12 months, and alternative fuels such as LNG, methanol and ammonia may reduce future demand for scrubbers, while suppliers are adapting scrubbers to capture carbon dioxide onboard.

Market Dynamics

Market Drivers
• Sulphur Regulations and Emission Control Areas:The IMO's global 0.50% sulphur cap and 0.10% limits in emission control areas, including the Baltic Sea, North Sea, North American coasts, US Caribbean, the Mediterranean since May 2025, and the Canadian Arctic and Norwegian Sea from 2027, require ships to use compliant fuels or scrubbers. New and proposed emission control areas, such as the North-East Atlantic, extend the areas where scrubbers deliver the greatest savings compared with expensive distillate fuels.
• Fuel Price Spread and Payback Economics:Scrubber economics depend on the price difference between high-sulphur fuel oil and compliant fuels such as very low sulphur fuel oil and marine gasoil. When the spread is wide, as in 2022 and during periods of market volatility, scrubbers can pay back their installation cost within one to three years for large ships with high fuel consumption. Shipowners and charterers share the savings, and scrubber-fitted ships can earn charter premiums.

Market Challenges
• Restrictions on Open-Loop Washwater Discharge:Environmental concerns about acidic, metal-laden and polycyclic aromatic hydrocarbon-containing washwater have led many ports and countries to ban open-loop scrubber discharges, and OSPAR parties agreed in 2025 to ban open-loop discharge from 2027. Stricter rules may require hybrid or closed-loop systems, increasing costs and complexity, and the IMO continues to review washwater guidelines. Uncertainty about future bans discourages some investments.
• Decarbonisation and Alternative Fuels:The shipping industry's shift toward lower-carbon fuels, including LNG, methanol, ammonia and biofuels, and the IMO's greenhouse gas strategy may reduce long-term use of high-sulphur fuel oil and therefore demand for scrubbers. Ships designed for alternative fuels may not need scrubbers, and the EU ETS for shipping and FuelEU Maritime increase the cost of fossil fuels. The delay of the IMO Net-Zero Framework in 2025 added uncertainty.



Market Trends
• Hybrid and Closed-Loop Systems:Shipowners increasingly choose hybrid scrubbers that can operate in open-loop mode at sea and closed-loop mode in ports and restricted areas, or closed-loop systems with washwater treatment, to comply with discharge bans. Suppliers are improving washwater treatment, reducing caustic consumption and developing systems that remove particulate matter and black carbon, which is a concern in the Arctic. Monitoring of washwater quality and emissions is becoming more sophisticated.
• Onboard Carbon Capture Integrated with Scrubbers:Scrubber suppliers and shipbuilders are developing onboard carbon capture and storage systems, often integrated with or built on scrubber technology, to capture carbon dioxide from exhaust and store it on board for offloading. Wärtsilä, Alfa Laval, Value Maritime, Seabound and others have pilot and commercial projects, and onboard carbon capture could help ships comply with future greenhouse gas rules while continuing to use conventional fuels.

Segment Analysis

Open-loop scrubbers account for the largest share of installed marine scrubbers, while hybrid and closed-loop systems are growing because of discharge restrictions. Open-loop scrubbers use seawater's natural alkalinity to neutralise sulphur oxides and discharge washwater back to the sea after treatment to meet pH and turbidity limits, and they accounted for the majority of systems installed before IMO 2020 because they are simpler and cheaper. Their use is increasingly restricted in ports and coastal waters. Closed-loop scrubbers circulate freshwater dosed with sodium hydroxide, with a small bleed-off treated and discharged or held on board, and they can operate in areas where open-loop discharge is banned and in low-alkalinity waters, but they require caustic soda supply, storage and sludge handling. Hybrid scrubbers can switch between open-loop and closed-loop modes, offering flexibility for ships trading in areas with different rules, and they are increasingly preferred for new installations. Inline scrubbers are installed in the exhaust pipe of each engine, while multi-inlet or integrated scrubbers serve several engines and boilers. Scrubbers with additional particulate matter and black carbon removal are emerging. Retrofit kits, washwater treatment systems, monitoring systems and spare parts form an aftermarket segment.

Container ships, tankers and bulk carriers account for the largest share of marine scrubber installations, while cruise ships, ro-ro vessels and car carriers form important segments. Container ships, particularly large vessels on Asia-Europe and transpacific routes with high fuel consumption, are one of the largest segments, and many major container lines such as MSC and others have fitted scrubbers to large parts of their fleets. Tankers, including very large crude carriers, product tankers and chemical tankers, have high fuel consumption and have adopted scrubbers widely, and the tanker market's strength has supported investments. Bulk carriers, including Capesize and Newcastlemax vessels, are major users because of long voyages and fuel use. Cruise ships were early adopters, installing scrubbers, often closed-loop or hybrid, to comply with emission control areas in the Baltic, North Sea and North America, and they increasingly also use LNG. Ro-ro, ferry and car carrier vessels operating in emission control areas in Northern Europe use scrubbers. Offshore vessels, reefers, general cargo ships and LPG carriers form smaller segments. Naval and government vessels rarely use scrubbers. Newbuilding orders increasingly specify either scrubber installation or alternative fuel capability.

Retrofits account for a large share of marine scrubber installations, while newbuild installations are an important and stable segment. Retrofit installations on existing ships dominated the market during the IMO 2020 transition, as shipowners installed scrubbers in shipyards in China, Singapore, Europe and elsewhere, often requiring dry docking and significant structural work. Retrofit demand depends on the fuel price spread, ship age and remaining trading life, and it revived after 2022 when price spreads widened. Newbuild installations, in which scrubbers are designed and installed during ship construction, are cheaper and simpler to integrate, and many new container ships, tankers and bulk carriers are delivered with scrubbers, particularly those not designed for alternative fuels. The Mediterranean emission control area and future emission control areas encourage installations on ships trading in these regions. Aftermarket services, including maintenance, spare parts, washwater monitoring equipment, crew training and upgrades from open-loop to hybrid, provide recurring revenue. Removal or decommissioning of scrubbers is rare, as ships generally keep systems once installed. Suppliers also offer remote monitoring and performance optimisation services.

Main engines account for the largest share of exhaust treated by marine scrubbers, while multi-stream systems cover auxiliary engines and boilers. Main engine exhaust, from large two-stroke or four-stroke engines that propel ships, accounts for the largest share of sulphur oxide emissions and fuel consumption, and scrubbers treating main engine exhaust deliver most of the fuel savings. Auxiliary engines, which generate electricity on board, and boilers, which produce steam for heating fuel and cargo, also burn fuel and may be connected to the same scrubber in multi-inlet designs or treated separately. Integrated systems serving multiple exhaust streams reduce equipment and space requirements but are more complex. Some ships use scrubbers only on main engines and burn compliant fuel in auxiliary engines and boilers. Scrubber sizing depends on engine power, ranging from a few megawatts for smaller vessels to more than 60 megawatts for the largest container ships. Engine manufacturers, including MAN Energy Solutions, WinGD and Wärtsilä, work with scrubber suppliers to ensure compatibility, and exhaust back-pressure and bypass arrangements must be considered.

Regional Analysis

Europe and Asia-Pacific lead the marine scrubber systems market, with Europe home to major suppliers and strict emission control areas and Asia-Pacific the centre of shipbuilding, retrofitting and many shipowners, while North America and the Middle East are important trading regions. Europe is a key region for marine scrubbers, home to leading suppliers such as Wärtsilä, Alfa Laval, Yara Marine Technologies, Valmet, Andritz and Clean Marine, and to major shipowners in Greece, Norway, Denmark, Germany, Switzerland and Italy. European waters include emission control areas in the Baltic Sea, North Sea and, since May 2025, the Mediterranean, with the Norwegian Sea emission control area applying 0.10% sulphur from March 2027 and a North-East Atlantic emission control area proposed, increasing the value of scrubbers. At the same time, European ports such as Antwerp, Hamburg, Amsterdam and many others ban open-loop discharges, and OSPAR parties agreed in 2025 to ban open-loop discharge from 2027. Asia-Pacific is the centre of shipbuilding and retrofitting, with shipyards in China, South Korea, Japan and Singapore installing scrubbers on newbuilds and existing ships, and major shipowners in China, Japan, South Korea, Singapore, Hong Kong and Taiwan operating scrubber-fitted fleets. Chinese and Korean suppliers have gained market share. Several Asian ports and countries restrict open-loop discharges. North America has emission control areas along US and Canadian coasts and the US Caribbean, and the Canadian Arctic emission control area adds requirements from 2027, while some US states restrict scrubber discharges. The Middle East, including Fujairah and Saudi Arabian ports that restrict open-loop use, is a major bunkering and trading hub. Latin America and Africa are important trading regions with fewer restrictions.

Considered in this report
• Historic Year: 2020
• Base Year: 2025
• Estimated Year: 2026
• Forecast Year: 2031

Aspects covered in this report
• Global Marine Scrubber Systems Market with its value and forecast along with its segments
• Various drivers and challenges
• Ongoing trends and developments
• Top profiled companies
• Strategic recommendation

By Technology
• Open-Loop Scrubbers
• Closed-Loop Scrubbers
• Hybrid Scrubbers
• Scrubbers with Onboard Carbon Capture

By Vessel Type
• Container Ships
• Tankers
• Bulk Carriers
• Cruise Ships
• Ro-Ro, Ferries and Car Carriers
• Other Vessels

By Installation Type
• Retrofit
• Newbuild
• Aftermarket Services

By Application
• Main Engine
• Auxiliary Engine
• Boiler
• Multi-Stream Systems