Protecting Water and Wastewater Infrastructure from the Inside Out with Sherwin-Williams Heat-Flex® AEB

Water and wastewater infrastructure is critical to public health and environmental sustainability. However, these systems face persistent challenges, particularly when it comes to maintaining the integrity of condensating pipes and other thermal assets. One of the most insidious threats is corrosion under insulation (CUI), which occurs when moisture becomes trapped between traditional insulation materials and the metal substrate. This hidden corrosion can lead to costly failures, unplanned downtime and safety hazards.

Sherwin-Williams has introduced a revolutionary solution to this problem: Heat-Flex® AEB. This advanced thermal insulative coating is engineered specifically for the demands of water and wastewater facilities. Unlike traditional insulation systems, Heat-Flex® AEB is applied directly to primed steel surfaces, eliminating the need for mineral wool, cladding and the corrosion-prone gap between insulation and substrate.

Applications for Sherwin-Williams Heat-Flex® AEB in Water and Wastewater Facilities

Heat-Flex® AEB is particularly well-suited for use in water and wastewater treatment plants. These facilities often operate in environments where moisture, temperature fluctuations and chemical exposure are common. The coating's ability to form a seamless, protective barrier makes it ideal for use on process piping, storage tanks, valves and fittings.

In addition to protecting assets from corrosion, Heat-Flex® AEB helps maintain energy efficiency by reducing heat loss and minimizing thermal swings. This not only extends the life of infrastructure but also contributes to operational cost savings and environmental compliance.

Engineering and Safety Advantages of Sherwin-Williams Heat-Flex® AEB

Heat-Flex® AEB is more than just a coating—it is a high-performance engineering solution. Its innovative acrylic waterborne formulation with insulating pigmentation allows for high film build (150-200 mils per coat), achieving the desired thermal efficiency with fewer applications. The coating is also easily repairable, allowing for quick fixes using a hand trowel without the need for extensive rework.

From a safety perspective, Heat-Flex® AEB reduces burn risk for personnel working near hot surfaces and simplifies maintenance procedures. Its compatibility with other Sherwin-Williams primers and coatings ensures a comprehensive protection system tailored to the specific needs of water and wastewater infrastructure.

The Case for Heat-Flex® AEB in Modern Water and Wastewater Facilities

As water and wastewater facilities continue to modernize, the need for innovative, sustainable and efficient protective solutions becomes increasingly important. Heat-Flex® AEB offers a forward-thinking alternative to traditional insulation systems, addressing the root causes of corrosion and inefficiency. By investing in this advanced coating technology, facility managers can enhance asset longevity, reduce maintenance costs and support environmental goals.

Frequently Asked Questions About Sherwin-Williams Heat-Flex® AEB 

What causes corrosion under insulation (CUI) in water infrastructure?

CUI is typically caused by trapped moisture between insulation and metal surfaces. Over time, this creates an ideal environment for corrosion, which is difficult to detect until significant damage occurs.

How does Sherwin-Williams Heat-Flex® AEB help with energy efficiency?

With its low thermal conductivity, Heat-Flex® AEB reduces heat loss and minimizes energy waste, helping facilities stay compliant with environmental regulations and reduce utility costs.

Why is Heat-Flex® AEB considered a sustainable alternative? 

It eliminates the need for mineral wool and cladding, which require more energy and resources to manufacture, transport and dispose of—reducing your overall environmental impact.

What problems does Heat-Flex® AEB solve in water and wastewater facilities?

Heat-Flex® AEB addresses CUI, moisture intrusion and inefficient thermal performance. It helps facilities improve equipment longevity and reduce operational disruptions caused by hidden corrosion or insulation failures.

Can Heat-Flex® AEB be used while equipment is in operation?

Yes. One of its major benefits is that it can be applied to surfaces that are already hot—up to 300°F (148°C)—minimizing downtime and avoiding costly shutdowns.

Is Heat-Flex® AEB compliant with environmental regulations?

Absolutely. Its waterborne acrylic formulation supports sustainability goals and reduces reliance on traditional insulation materials that contribute to landfill waste and carbon emissions during production.

What surfaces or components can be coated with Heat-Flex® AEB?

It’s ideal for condensating pipes, storage tanks, process piping, fittings and valves—especially in environments with high humidity or temperature fluctuations.

Partner with Sherwin-Williams to Protect and Future-Proof Your Water Infrastructure 

At Sherwin-Williams, we recognize the evolving challenges that water and wastewater facilities face—especially when it comes to combating corrosion, maintaining thermal efficiency and supporting sustainability goals. With Heat-Flex® AEB, we’re proud to offer a next-generation solution that simplifies maintenance, eliminates CUI risks and enhances long-term asset performance.

From early design decisions to application and support, our team is here to guide you through every step of the protective coatings process. We bring decades of expertise in water infrastructure and are committed to delivering solutions that align with your operational goals and environmental standards.

Ready to upgrade your facility with a smarter, more sustainable coating system? Contact Sherwin-Williams today to learn how Heat-Flex® AEB can make a lasting impact on your infrastructure.