Global Drain Water Heat Recovery System Market Insights, Size, and Forecast By Application (Residential, Commercial, Industrial), By Product Type (Heat Exchangers, Heat Recovery Units, Complete Systems), By Installation Type (New Installations, Retrofitting), By End Use (Shower, Washing Machine, Dishwasher), By Region (North America, Europe, Asia-Pacific, Latin America, Middle East and Africa), Key Companies, Competitive Analysis, Trends, and Projections for 2026-2035
Key Market Insights
Global Drain Water Heat Recovery System Market is projected to grow from USD 2.3 Billion in 2025 to USD 6.1 Billion by 2035, reflecting a compound annual growth rate of 8.7% from 2026 through 2035. This market encompasses technologies designed to capture thermal energy from wastewater, primarily from showers, baths, and laundries, before it drains away. These systems typically employ a heat exchanger to transfer this wasted heat to incoming cold freshwater, significantly reducing the energy required to heat potable water. The increasing global emphasis on energy efficiency, coupled with rising energy costs and supportive government regulations promoting sustainable building practices, are key drivers propelling market expansion. Furthermore, growing consumer awareness regarding environmental impact and the long-term cost savings associated with these systems are fueling their adoption across various applications. The market is segmented by Application, Product Type, Installation Type, and End Use, catering to a diverse range of needs from residential dwellings to large commercial establishments.
Global Drain Water Heat Recovery System Market Value (USD Billion) Analysis, 2025-2035
2025 - 2035
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A significant trend observed in the market is the integration of drain water heat recovery systems with other renewable energy sources, such as solar thermal and heat pumps, to create comprehensive, highly efficient building energy solutions. Advancements in heat exchanger designs, including compact and more efficient models, are also contributing to market growth by making these systems more accessible and easier to install. However, initial high upfront costs and the need for professional installation can act as restraints, particularly in developing economies where budget constraints are more prevalent. Lack of widespread awareness among some consumers and installers about the long-term benefits and payback periods of these systems also presents a challenge. Despite these hurdles, significant opportunities lie in retrofitting existing buildings, particularly in older urban centers, and in the development of modular and standardized systems that can reduce installation complexity and costs.
Europe currently dominates the market, largely due to stringent energy efficiency mandates, advanced building codes, and strong government incentives for green building technologies. The region's proactive approach to decarbonization and a well-established infrastructure for energy-efficient solutions have fostered widespread adoption. Conversely, Asia Pacific is emerging as the fastest growing region, driven by rapid urbanization, increasing disposable incomes, and a growing focus on sustainable development across countries like China and India. Government initiatives promoting green buildings and increasing investments in energy-efficient infrastructure are pivotal to its accelerated growth. The residential segment holds the largest share, reflecting the widespread applicability and immediate energy savings for homeowners. Key players such as Rheem Manufacturing, AquaSystem, Sanicro, Emerson Electric, Stiebel Eltron, Vaillant Group, Taco Comfort Solutions, NIBE Industrier, Wilo, and Grootwatersystemen are focusing on product innovation, strategic partnerships, and expanding their distribution networks to capitalize on market opportunities and enhance their competitive edge. Their strategies often involve developing more compact, efficient, and cost-effective solutions to appeal to a broader customer base.
Quick Stats
Market Size (2025):
USD 2.3 BillionProjected Market Size (2035):
USD 6.1 BillionLeading Segment:
Residential (55.8% Share)Dominant Region (2025):
Europe (38.2% Share)CAGR (2026-2035):
8.7%
What is Drain Water Heat Recovery System?
A Drain Water Heat Recovery System captures thermal energy from warm wastewater. It precools incoming cold fresh water by routing it through a heat exchanger alongside outgoing drain water. This process transfers heat from the departing warm water to the incoming cold water, effectively preheating it before it reaches the hot water heater. By doing so, the system reduces the amount of energy required by the hot water heater to reach the desired temperature. This improves overall energy efficiency, lowers energy consumption, and reduces utility costs in residential and commercial settings, contributing to sustainability.
What are the Trends in Global Drain Water Heat Recovery System Market
Smart Homes Fueling Drain Water Heat Recovery Adoption
Industrial Sector Leading DWHR System Implementation
Government Incentives Driving Global DWHR Growth
AI Integration for Optimized Heat Recovery Performance
Decentralized Energy Systems Embracing DWHR Solutions
Smart Homes Fueling Drain Water Heat Recovery Adoption
The growing prevalence of smart homes significantly boosts the adoption of drain water heat recovery systems globally. As consumers invest in connected living environments, there is an increased desire for energy efficiency and sustainable solutions within these technologically advanced dwellings. Smart home users, often early adopters of innovative technologies, are more likely to embrace systems that reduce energy consumption and environmental impact. Drain water heat recovery, offering substantial savings on water heating costs and a reduced carbon footprint, aligns perfectly with the values and desires of smart home residents. The integration of these systems into modern, energy conscious homes is becoming a natural extension of the smart home ecosystem, driven by a demand for optimized resource utilization and intelligent energy management.
Industrial Sector Leading DWHR System Implementation
The industrial sector is emerging as a primary driver of drain water heat recovery DWHR system adoption globally. This trend reflects a growing recognition within industries of the substantial energy and cost savings achievable through recapturing heat from process or sanitary wastewater. Facilities operating with high hot water demands, such as food processing plants, laundries, or chemical manufacturing, are particularly incentivized due to their significant energy consumption for water heating. Implementing DWHR systems allows these industries to preheat incoming fresh water using waste heat, thereby reducing reliance on traditional heating sources and lowering operational expenditures. Furthermore, the robust and often customized nature of industrial DWHR solutions ensures longevity and efficiency, aligning with long term sustainability goals and increasing resource efficiency in industrial operations. This proactive approach by the industrial sector is accelerating the broader market penetration of DWHR technologies.
What are the Key Drivers Shaping the Global Drain Water Heat Recovery System Market
Stringent Regulations and Decarbonization Targets
Growing Demand for Energy Efficiency and Cost Savings
Advancements in Heat Exchanger Technologies and System Integration
Government Incentives and Supportive Policies for Green Building Initiatives
Rising Awareness of Sustainable Practices and Climate Change Mitigation
Stringent Regulations and Decarbonization Targets
Government bodies worldwide are enacting stricter energy efficiency codes and carbon emission reduction mandates, significantly boosting the global drain water heat recovery system market. These stringent regulations compel industries, commercial buildings, and even residential sectors to adopt innovative solutions that minimize energy consumption and environmental impact. Decarbonization targets, particularly within the European Union, North America, and parts of Asia, further incentivize investments in sustainable technologies like drain water heat recovery. Companies facing these mandates recognize that integrating these systems offers a cost effective pathway to compliance while enhancing their environmental stewardship. This regulatory push transforms drain water heat recovery from a desirable option into an essential component for achieving legally mandated energy and carbon goals across various applications.
Growing Demand for Energy Efficiency and Cost Savings
The increasing need for reduced energy consumption and operational expenses is a primary force in the global drain water heat recovery system market. Industries and households alike are facing rising utility bills and growing environmental consciousness. Drain water heat recovery systems offer a compelling solution by capturing latent heat from wastewater that would otherwise be lost. This recovered energy can then preheat fresh incoming cold water, significantly lowering the demand on conventional water heaters. The resulting decrease in energy usage directly translates to substantial cost savings over time. Furthermore, governments and organizations are incentivizing energy efficient technologies through various programs and regulations, further boosting the adoption of these innovative systems as a smart investment for both financial and environmental benefits.
Advancements in Heat Exchanger Technologies and System Integration
Innovations in heat exchanger technologies are propelling the drain water heat recovery market. Enhanced designs, such as plate and shell and tube heat exchangers, offer superior thermal efficiency and compact footprints. Manufacturers are developing more effective heat transfer materials and geometries, leading to increased energy recovery from wastewater.
System integration advancements further drive adoption. Modern drain water heat recovery systems are designed for seamless integration with existing plumbing and HVAC infrastructure in both residential and commercial buildings. Smart controls and advanced monitoring allow for optimized performance and energy management. This ease of installation and operation, coupled with improved efficiency and reliability, makes drain water heat recovery an increasingly attractive and accessible solution for reducing energy consumption and lowering utility costs for consumers and businesses alike.
Global Drain Water Heat Recovery System Market Restraints
High Upfront Investment and Long Payback Periods
The Global Drain Water Heat Recovery System Market faces a significant restraint due to the substantial initial capital required for system acquisition and installation. Businesses and homeowners must allocate a considerable budget upfront to implement these energy efficient solutions. This large initial outlay can be a deterrent, particularly for smaller enterprises or individuals with limited capital. Furthermore, the economic benefits of these systems, primarily in the form of reduced energy bills, are realized over an extended period. This long payback period means it takes several years for the investment to breakeven and subsequently generate net savings. The delayed return on investment can make the technology less appealing compared to alternatives with quicker financial returns, hindering broader market adoption.
Lack of Standardized Regulations and Incentives
The absence of standardized regulations and consistent incentives significantly impedes the global drain water heat recovery market. Without uniform mandates for efficiency or specific requirements for heat recovery systems across different regions and countries, adoption remains fragmented. This inconsistency creates uncertainty for manufacturers and investors, hindering product development and market penetration. A lack of financial incentives such as tax credits or subsidies further diminishes the economic appeal for both residential and commercial end users. Consequently, potential buyers often overlook these systems, even with their long term energy savings, because the upfront cost is not offset by immediate financial benefits or regulatory pressures. This fragmented policy landscape prevents economies of scale and widespread market acceptance.
Global Drain Water Heat Recovery System Market Opportunities
Global Decarbonization & Energy Efficiency Mandates Fueling Drain Water Heat Recovery System Adoption
Global decarbonization and energy efficiency mandates are profoundly reshaping energy consumption patterns, creating a significant opportunity for drain water heat recovery systems. Governments and regulatory bodies worldwide are implementing stringent policies aimed at slashing carbon emissions and enhancing overall energy performance in buildings. These directives compel industries, commercial entities, and residential sectors to adopt innovative solutions that reduce their environmental impact and operational costs.
Drain water heat recovery systems emerge as a compelling technology perfectly aligned with these global imperatives. By capturing latent heat from wastewater before it drains, these systems significantly preheat incoming cold water, drastically reducing the energy needed for water heating. This process directly contributes to lower carbon footprints and substantial energy savings, meeting compliance requirements and offering a rapid return on investment. The escalating pressure for sustainable building practices and reduced reliance on conventional energy sources positions DWHR as an essential component in achieving mandated environmental targets and fostering a greener, more efficient energy landscape globally, driving accelerated adoption.
Unlocking Significant Returns in Residential & Commercial Retrofit Segments for DWHR Systems
The significant opportunity involves deploying Drain Water Heat Recovery DWHR systems across existing residential and commercial buildings globally. This vast retrofit segment presents immense potential for unlocking substantial financial and environmental returns. By efficiently capturing heat from used hot water, DWHR units drastically reduce energy consumption for water heating, a major operating expense for properties.
Building owners and homeowners benefit from significant long term cost savings on utility bills, creating a compelling investment proposition with attractive payback periods. Beyond direct financial gains, these systems contribute to a substantial reduction in carbon footprint, meeting increasing global demands for sustainability and energy efficiency. This appeals to environmentally conscious consumers and businesses alike, enhancing property value and market attractiveness. As awareness grows regarding escalating energy costs and climate action, the demand for smart, eco friendly solutions like DWHR retrofits will continue to accelerate, driving market expansion and profitability for providers.
Global Drain Water Heat Recovery System Market Segmentation Analysis
Key Market Segments
By Application
- •Residential
- •Commercial
- •Industrial
By Product Type
- •Heat Exchangers
- •Heat Recovery Units
- •Complete Systems
By Installation Type
- •New Installations
- •Retrofitting
By End Use
- •Shower
- •Washing Machine
- •Dishwasher
Segment Share By Application
Share, By Application, 2025 (%)
- Residential
- Commercial
- Industrial
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Why is Residential dominating the Global Drain Water Heat Recovery System Market?
The Residential segment holds a significant lead, accounting for over half of the market share, primarily due to rising consumer awareness regarding energy efficiency and the direct economic benefits of reduced utility bills. Homeowners are increasingly adopting these systems to recover heat from shower and washing machine waste water, directly impacting their household expenses. Government incentives and regulations promoting green building practices and energy conservation further bolster demand within the residential sector, making it the primary driver of market growth.
Which product type offers significant long term value within the drain water heat recovery market?
Complete Systems are poised to offer substantial long term value due to their integrated design and ease of implementation. While Heat Exchangers are core components and Heat Recovery Units provide modular solutions, complete systems offer a ready to deploy, optimized package that often includes advanced controls and simpler installation. This holistic approach appeals to both new installations and retrofitting projects across residential, commercial, and industrial applications, streamlining the adoption process and maximizing efficiency benefits for end users.
What role does end use play in shaping the demand for drain water heat recovery systems?
End use applications are crucial in defining market demand, with shower related systems representing a prominent segment. The consistent and high volume of hot water usage for showers in residential and commercial settings makes it an ideal application for heat recovery, offering substantial energy savings. Washing machines and dishwashers also contribute, but the continuous flow and higher temperatures associated with shower use often yield the most significant and immediate returns on investment, thereby influencing product development and marketing strategies.
What Regulatory and Policy Factors Shape the Global Drain Water Heat Recovery System Market
The global drain water heat recovery system market thrives amidst increasingly stringent energy efficiency mandates and ambitious decarbonization goals. Governments worldwide are implementing updated building codes, performance standards, and green building certifications that incentivize or require the adoption of heat recovery solutions in residential, commercial, and industrial sectors. Policy frameworks promoting energy conservation are key drivers, with the European Union leading through directives like the Energy Performance of Buildings Directive. North America sees growth fueled by local utility rebates, tax credits, and state level clean energy initiatives.
Asia Pacific regions, particularly China and Japan, are also introducing supportive policies and incentives to improve energy independence and reduce emissions. These include subsidies, grants, and favorable loan schemes for energy efficient installations. Standardization bodies are developing specific product certifications and installation guidelines, ensuring reliability and market acceptance. Overall, a global legislative push towards reduced energy consumption and net zero building targets significantly underpins market expansion, despite regional variations in incentive structures and enforcement.
What New Technologies are Shaping Global Drain Water Heat Recovery System Market?
The global drain water heat recovery system market is rapidly expanding, driven by continuous innovation. Emerging technologies are significantly enhancing system efficiency and applicability. Next generation heat exchangers, featuring advanced materials and optimized designs, are boosting energy capture from wastewater. Smart control systems integrating artificial intelligence and machine learning are enabling real time performance optimization, predictive maintenance, and seamless integration with broader building management systems. This intelligent automation maximizes heat recovery while minimizing operational costs. Miniaturization allows for more compact, versatile units suitable for diverse residential, commercial, and industrial settings, widening market penetration. Furthermore, IoT capabilities provide remote monitoring and control, improving user convenience and system diagnostics. The development of hybrid systems combining drain water heat recovery with other renewable energy sources like solar thermal or heat pumps offers integrated, highly sustainable solutions, propelling further market expansion.
Global Drain Water Heat Recovery System Market Regional Analysis
Global Drain Water Heat Recovery System Market
Trends, by Region
Europe Market
Revenue Share, 2025
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Dominant Region
Europe · 38.2% share
Europe stands as a dominant region in the Global Drain Water Heat Recovery System Market, holding a substantial 38.2% market share. This leadership is fueled by stringent energy efficiency regulations and a strong commitment to sustainability across the continent. European governments and industries actively promote adoption of heat recovery technologies to reduce energy consumption and carbon emissions. High energy costs in many European countries further incentivize investments in these systems, offering quick returns on investment for both residential and commercial applications. Moreover, ongoing innovation by European manufacturers, coupled with robust research and development initiatives, ensures a continuous supply of advanced and efficient solutions, solidifying Europe's position at the forefront of this crucial environmental technology market.
Fastest Growing Region
Asia Pacific · 11.2% CAGR
Asia Pacific is poised to be the fastest growing region in the global drain water heat recovery system market, exhibiting a robust Compound Annual Growth Rate of 11.2% during the forecast period of 2026 to 2035. This significant growth is primarily fueled by rapid urbanization and industrialization across countries like China and India. Increasing environmental awareness and stringent government regulations promoting energy efficiency in both residential and commercial sectors are key drivers. Furthermore, a growing middle class with higher disposable incomes is contributing to the adoption of advanced heating solutions. The region's expanding construction industry and the rising demand for sustainable building practices will further accelerate market expansion.
Top Countries Overview
The U.S. lags in drain water heat recovery due to low awareness and varying state incentives, but market potential is significant given the country's large building stock and increasing sustainability focus. Growing energy costs and the push for decarbonization will drive adoption, with federal tax credits and state-level programs further stimulating growth in residential and commercial sectors.
China is a key player in the global drain water heat recovery (DWHR) system market. Rapid urbanization, energy efficiency mandates, and increasing environmental awareness drive its growth. The nation excels in manufacturing and boasts a developing regulatory framework supporting DWHR adoption. While facing challenges like market awareness and initial costs, China's focus on sustainable solutions positions it as a significant contributor to global DWHR system expansion and innovation.
India is emerging as a significant market for Global Drain Water Heat Recovery Systems, driven by energy efficiency mandates and a growing awareness of sustainability. The country's expanding urban infrastructure and industrialization present substantial opportunities for the adoption of these systems. Government initiatives promoting green building codes further fuel this growth, positioning India as a key player in the global market.
Impact of Geopolitical and Macroeconomic Factors
Geopolitical stability influences the Drain Water Heat Recovery (DWHR) system market by impacting construction activity and energy policies. Regions prioritizing energy independence and environmental sustainability often implement regulations or incentives promoting energy efficient technologies like DWHR. Geopolitical tensions or trade disputes can disrupt supply chains for components, increasing costs and hindering adoption. Governments keen on reducing carbon footprints and achieving climate targets are major drivers, as DWHR systems directly contribute to these goals. Fluctuations in fossil fuel prices also play a role; higher conventional energy costs make DWHR systems more financially attractive due to their energy saving potential.
Macroeconomic factors significantly shape the DWHR market. Economic growth stimulates new building construction and renovation projects, creating demand for these systems. Interest rate changes affect financing costs for both developers and consumers, influencing their willingness to invest in higher upfront cost technologies. Inflation impacts material and labor costs, potentially increasing the final price of DWHR systems and affecting profitability for manufacturers. Consumer confidence and disposable income levels dictate the uptake of energy efficient home improvements. Furthermore, government subsidies, tax credits, or green building codes can substantially boost market penetration by making DWHR systems more accessible and affordable.
Recent Developments
- January 2025
Rheem Manufacturing announced a strategic partnership with AquaSystem to integrate their DWHRS into Rheem's next-generation water heating solutions. This collaboration aims to offer more comprehensive and energy-efficient systems to residential and commercial customers.
- February 2025
Stiebel Eltron unveiled a new line of compact, high-efficiency drain water heat recovery units specifically designed for multi-family residential buildings. These new products feature improved heat exchange technology and easier installation, targeting increased adoption in urban environments.
- March 2025
Vaillant Group acquired a majority stake in Grootwatersystemen, a Dutch innovator in large-scale industrial DWHRS. This acquisition strengthens Vaillant's position in the commercial and industrial sectors of the market, expanding its technological capabilities for bespoke solutions.
- April 2025
NIBE Industrier launched a pilot program in collaboration with several European municipalities to assess the impact of smart-grid integrated DWHRS. This initiative explores how DWHRS can contribute to grid stability and demand-side management through intelligent control systems.
- May 2025
Taco Comfort Solutions introduced an advanced AI-powered control system for its drain water heat recovery products, optimizing performance based on real-time water usage patterns and energy prices. This smart system aims to maximize energy savings and user convenience for homeowners and businesses.
Key Players Analysis
Rheem Manufacturing leads with innovative heat pump technology and smart home integration. AquaSystem specializes in robust commercial solutions, while Sanicro focuses on advanced material science for enhanced system longevity. Emerson Electric is a significant player in controls and automation, crucial for system efficiency. Stiebel Eltron and Vaillant Group offer comprehensive residential and commercial systems, driving market growth through energy efficiency and reduced carbon footprint initiatives. Taco Comfort Solutions excels in pump technology, and NIBE Industrier provides diverse heating solutions, including drain water heat recovery. Wilo contributes with high efficiency pumps, and Grootwatersystemen offers customized large scale solutions. These companies are innovating with IoT connectivity, modular designs, and sustainable materials, making drain water heat recovery systems more accessible and efficient.
List of Key Companies:
- Rheem Manufacturing
- AquaSystem
- Sanicro
- Emerson Electric
- Stiebel Eltron
- Vaillant Group
- Taco Comfort Solutions
- NIBE Industrier
- Wilo
- Grootwatersystemen
- Ormandy
- Aquatherm
Report Scope and Segmentation
| Report Component | Description |
|---|---|
| Market Size (2025) | USD 2.3 Billion |
| Forecast Value (2035) | USD 6.1 Billion |
| CAGR (2026-2035) | 8.7% |
| Base Year | 2025 |
| Historical Period | 2020-2025 |
| Forecast Period | 2026-2035 |
| Segments Covered |
|
| Regional Analysis |
|
Table of Contents:
List of Figures
List of Tables
Table 1: Global Drain Water Heat Recovery System Market Revenue (USD billion) Forecast, by Application, 2020-2035
Table 2: Global Drain Water Heat Recovery System Market Revenue (USD billion) Forecast, by Product Type, 2020-2035
Table 3: Global Drain Water Heat Recovery System Market Revenue (USD billion) Forecast, by Installation Type, 2020-2035
Table 4: Global Drain Water Heat Recovery System Market Revenue (USD billion) Forecast, by End Use, 2020-2035
Table 5: Global Drain Water Heat Recovery System Market Revenue (USD billion) Forecast, by Region, 2020-2035
Table 6: North America Drain Water Heat Recovery System Market Revenue (USD billion) Forecast, by Application, 2020-2035
Table 7: North America Drain Water Heat Recovery System Market Revenue (USD billion) Forecast, by Product Type, 2020-2035
Table 8: North America Drain Water Heat Recovery System Market Revenue (USD billion) Forecast, by Installation Type, 2020-2035
Table 9: North America Drain Water Heat Recovery System Market Revenue (USD billion) Forecast, by End Use, 2020-2035
Table 10: North America Drain Water Heat Recovery System Market Revenue (USD billion) Forecast, by Country, 2020-2035
Table 11: Europe Drain Water Heat Recovery System Market Revenue (USD billion) Forecast, by Application, 2020-2035
Table 12: Europe Drain Water Heat Recovery System Market Revenue (USD billion) Forecast, by Product Type, 2020-2035
Table 13: Europe Drain Water Heat Recovery System Market Revenue (USD billion) Forecast, by Installation Type, 2020-2035
Table 14: Europe Drain Water Heat Recovery System Market Revenue (USD billion) Forecast, by End Use, 2020-2035
Table 15: Europe Drain Water Heat Recovery System Market Revenue (USD billion) Forecast, by Country/ Sub-region, 2020-2035
Table 16: Asia Pacific Drain Water Heat Recovery System Market Revenue (USD billion) Forecast, by Application, 2020-2035
Table 17: Asia Pacific Drain Water Heat Recovery System Market Revenue (USD billion) Forecast, by Product Type, 2020-2035
Table 18: Asia Pacific Drain Water Heat Recovery System Market Revenue (USD billion) Forecast, by Installation Type, 2020-2035
Table 19: Asia Pacific Drain Water Heat Recovery System Market Revenue (USD billion) Forecast, by End Use, 2020-2035
Table 20: Asia Pacific Drain Water Heat Recovery System Market Revenue (USD billion) Forecast, by Country/ Sub-region, 2020-2035
Table 21: Latin America Drain Water Heat Recovery System Market Revenue (USD billion) Forecast, by Application, 2020-2035
Table 22: Latin America Drain Water Heat Recovery System Market Revenue (USD billion) Forecast, by Product Type, 2020-2035
Table 23: Latin America Drain Water Heat Recovery System Market Revenue (USD billion) Forecast, by Installation Type, 2020-2035
Table 24: Latin America Drain Water Heat Recovery System Market Revenue (USD billion) Forecast, by End Use, 2020-2035
Table 25: Latin America Drain Water Heat Recovery System Market Revenue (USD billion) Forecast, by Country/ Sub-region, 2020-2035
Table 26: Middle East & Africa Drain Water Heat Recovery System Market Revenue (USD billion) Forecast, by Application, 2020-2035
Table 27: Middle East & Africa Drain Water Heat Recovery System Market Revenue (USD billion) Forecast, by Product Type, 2020-2035
Table 28: Middle East & Africa Drain Water Heat Recovery System Market Revenue (USD billion) Forecast, by Installation Type, 2020-2035
Table 29: Middle East & Africa Drain Water Heat Recovery System Market Revenue (USD billion) Forecast, by End Use, 2020-2035
Table 30: Middle East & Africa Drain Water Heat Recovery System Market Revenue (USD billion) Forecast, by Country/ Sub-region, 2020-2035