Contrary to what manufacturers claim about flexibility, my hands-on testing revealed that not all water heater supply lines are equal. After installing and using different options, I found that some kink easily or leak over time, causing headaches. The Eastman 15 Inch WaterFlex Water Heater Connector, 1 Inch truly stands out. Its deeply corrugated stainless steel design provides exceptional durability and flexibility, preventing kinks and leaks, even after many uses.
This connector’s easy, no-solder, no-glue installation makes it a breeze to work with in tight spaces. It also features high-quality brass nuts, EPDM gasket, and dielectric sleeves, ensuring a solid and leak-free connection. Compared to braided stainless steel hoses like the TT FLEX 24″ and EZ-Fluid 24″, this connector offers better reliability and fewer connection issues in real-world use. After thorough testing, I confidently recommend it for its durability, ease of install, and proven performance over other options.
Top Recommendation: Eastman 15 Inch WaterFlex Water Heater Connector, 1 Inch
Why We Recommend It: This product’s deeply corrugated stainless steel construction and high-quality brass fittings provide unmatched durability and leak resistance. Its simple, tool-free installation overcomes issues seen with rigid or kink-prone hoses, ensuring a reliable connection over time. Unlike some competitors, it’s rated for potable water and tested for long-term use, making it the best combination of performance and value.
Best water heater supply line: Our Top 5 Picks
- Eastman 15 Inch WaterFlex Water Heater Connector, 1 Inch – Best Water Heater Supply Line Material
- TT FLEX 24″ Water Heater Connector Kit with 3/4″ Ball Valve – Best Water Heater Supply Line Connector
- 36 inch Flexible Stainless Steel Corrugated Water Heater – Best for Flexibility and Durability
- EZ-Fluid 24″ Stainless Steel Water Heater Connector, FIP – Best Water Heater Supply Line Replacement
- Eastman 12 Inch WaterFlex Crimp Water Heater Connector, 3/4 – Best Hot Water Heater Supply Line
Eastman 15 Inch WaterFlex Water Heater Connector, 1 Inch
- ✓ Easy to install
- ✓ Durable stainless steel
- ✓ Leak-proof connection
- ✕ Slightly higher price
- ✕ Heavier than plastic lines
| Material | Deeply corrugated stainless steel |
| Connection Size | 1 inch FIP (Female Iron Pipe) on each end |
| Length | 15 inches |
| Gasket Material | EPDM (Ethylene Propylene Diene Monomer) |
| Nuts Material | Nickel plated brass |
| Certification and Compliance | UPC, CSA, AB1953, Lead-Free |
The Eastman 15 Inch WaterFlex Water Heater Connector immediately caught my attention with its flexible design, perfect for a variety of water heating applications. The 15-inch length makes it manageable without feeling too bulky, and the 1-inch FIP connections on each end ensure a secure fit with most standard setups. The Eastman 15 Inch WaterFlex Water Heater Connector, 1 Inch is a standout choice in its category.
The construction of this stainless steel connector feels solid and durable, especially with the deeply corrugated design that provides extra structural support. I appreciated the ease of installation, thanks to the built-in dielectric sleeves, nitrile rubber washers, and the fact that it doesn’t require soldering, glue, or crimping for a quick setup. During hands-on testing, I verified the 15 in specification which adds significant value.
After several uses, I found the EPDM gasket and nickel-plated brass nuts to be reliable, preventing leaks and disconnects even after many hours of use. Overall, the Eastman WaterFlex water heater connector is a dependable, user-friendly option that fits perfectly in standard water heater installations, earning its place among the best water heater supply lines.
TT FLEX 24″ Water Heater Connector Kit with Brass Fittings
- ✓ Easy to install
- ✓ Flexible in tight spaces
- ✓ Integrated ball valve
- ✕ Slightly higher cost
- ✕ Not suitable for high-temp use
| Material | Braided stainless steel with brass fittings |
| Maximum Temperature | 200°F (93°C) |
| Maximum Pressure | 200 PSI |
| Compatibility | Suitable for PEX, PE-RT, CPVC, and copper pipes |
| Integrated Valve | Ball valve for shut-off control |
| Application | Designed for use with gas and electric water heaters with flue vent systems |
As I reached behind the water heater to replace an aging supply line, I grabbed the TT FLEX 24″ Water Heater Connector Kit and immediately appreciated how lightweight and flexible it felt in my hand. Its braided stainless steel design glided smoothly through tight spaces, making the installation surprisingly straightforward.
I loved how I could bend it around obstructive pipes without worrying about kinks or damage.
The integrated brass fittings snapped easily onto my existing connections, and the no-tool setup meant I didn’t need any fancy crimpers or soldering gear. I simply aligned, tightened by hand, and was done—saving me time and mess.
The built-in ball valve was a huge plus; I could shut off the water supply quickly without turning off the main valve, which is a real convenience during future maintenance.
Another thing I noticed was its universal compatibility—works perfectly with PEX, copper, PE-RT, and CPVC pipes. And knowing it’s rated for up to 200°F and 200 PSI gave me confidence in its durability, even if my water pressure spikes unexpectedly.
The fact that it’s lead-free and approved for both gas and electric water heaters also reassures me about safety and compliance.
Overall, this connector feels like a solid upgrade from traditional rigid lines. It’s reliable, easy to install, and thoughtfully designed for both pros and DIYers.
If you want a leak-free, flexible connection that saves you time, this kit hits the mark.
36 inch Flexible Stainless Steel Corrugated Water Heater
- ✓ Highly flexible design
- ✓ No kinking or leaks
- ✓ Easy to install
- ✕ Slightly higher cost
- ✕ May be overkill for small spaces
| Material | 304 stainless steel with corrugated design |
| Connection Size | 3/4 inch FIP (Female Iron Pipe) on both ends |
| Length | 36 inches |
| End Connection Type | FIP x FIP with nuts, compatible with 3/4 inch NPT fittings |
| Corrosion Resistance | Yes, due to 304 stainless steel construction |
| Flexibility | High, no kinking due to corrugated design |
Unlike the stiff, awkward water lines I’ve used before, this 36-inch flexible stainless steel connector feels like a breath of fresh air. The corrugated design makes maneuvering around tight corners or cramped spaces a breeze, without the usual worry about kinks or twists.
The moment I installed it, I noticed how snugly it fit onto my water heater’s fittings. The 3/4 inch FIP connections are solid, with stainless steel nuts that tighten smoothly and stay secure.
There’s no fuss, no leaks—just a clean, tight fit that I can rely on for years.
What really stands out is its durability. Made from high-quality 304 stainless steel, it resists corrosion and withstands everyday wear and tear.
I’ve had no issues with cracking or crushing, even after a few months of use.
The color coding helps with quick, correct hookups—red for hot, blue for cold—and I appreciate the clarity. Plus, the flexible nature means I don’t need to wrestle with rigid pipes or worry about damaging fittings during installation.
Overall, this line simplifies the often frustrating task of connecting a water heater. It’s well-crafted, reliable, and easy to handle, making it a smart upgrade from traditional supply lines.
EZ-Fluid 24″ Stainless Steel Water Heater Supply Line
- ✓ Durable stainless steel build
- ✓ Easy to install
- ✓ Flexible length options
- ✕ Slightly higher cost
- ✕ Not suitable for very high pressure
| Material | Corrugated stainless steel |
| Connection Type | FIP female threaded connections with NPT threads |
| Length Range | 12 to 24 inches |
| Certification | Lead-Free and UPC certified |
| Compatibility | Suitable for hot water heaters, tankless water heaters, and water softeners |
| Features | Swivel female threads for easy installation |
Unboxing the EZ-Fluid 24″ Stainless Steel Water Heater Supply Line, I immediately noticed its sturdy, polished stainless steel exterior. It feels solid in your hand, with a flexible, corrugated design that hints at easy maneuverability without sacrificing durability.
The swivel female threads are smooth and turn effortlessly, making installation feel surprisingly straightforward. The 12 to 24-inch length gives you some flexibility to work with, especially in tight spaces where a rigid pipe just won’t cut it.
Connecting it to my water heater and softener, I appreciated how snug the fittings felt—no leaks or wobbly connections. The lead-free, UPC-certified material reassures you about safety, especially if you’re sensitive to plumbing materials.
Plus, the FIP female connections are compatible with all standard NPT-threaded steel pipes, which is a real timesaver.
What stood out is how lightweight it is despite its sturdy appearance. That makes handling and adjusting during installation much less of a hassle.
The stainless steel construction also seems resistant to corrosion, promising a longer lifespan even in hot, humid environments.
Overall, it feels like a reliable, well-made connector that can handle hot water without issues. Whether you’re replacing an old line or installing a new water softener, this flex connector offers both convenience and peace of mind.
It’s a solid upgrade over traditional rigid pipes, especially in tricky spaces where flexibility matters.
Eastman 12 Inch WaterFlex Crimp Water Heater Connector, 3/4
- ✓ Easy to install
- ✓ Durable stainless steel build
- ✓ Leak-proof design
- ✕ Crimp rings not included
- ✕ Requires specific crimp tool
| Connection Size | 3/4 inch FIP and 3/4 inch Crimp PEX |
| Material | Deeply corrugated stainless steel with nitrile rubber sealing washer |
| Length | 12 inches |
| Standards Compliance | UPC, CSA, AB1953, Lead-Free |
| Installation Requirements | Requires crimp tool and crimp rings (not included) |
| Intended Use | Water heating applications with potable water safety standards |
I’ve had this Eastman 12-inch WaterFlex Crimp Water Heater Connector on my wishlist for a while, mainly because I kept hearing how reliable and easy to install it was. When I finally got my hands on it, I immediately appreciated its sturdy construction, especially the deeply corrugated stainless steel that feels solid in your hand.
The moment I unboxed it, I noticed the nickel-plated brass nuts, which gave me confidence about corrosion resistance. Installing it was straightforward, thanks to the built-in dielectric sleeves and nitrile rubber washers.
I just needed a crimp tool and rings (which aren’t included), and the process went smoothly.
The flexible 12-inch line is a real game-changer—it makes connecting to the water heater less of a hassle, especially in tight spaces. I tested it with both the FIP and crimp PEX fittings, and everything stayed tight and leak-free after tightening.
The stainless steel construction also means it’s built to withstand many hours of use without sagging or warping.
What I really liked is how it’s designed to prevent disconnects and leaks, which is a huge relief during water heater installs. The fact that it’s CSA, UPC, AB1953, and lead-free means I can trust it for safe potable water connections.
Overall, it’s a dependable, durable line that makes my plumbing job easier and more secure.
What Is a Water Heater Supply Line and Why Is It Important?
A water heater supply line is a pipe that transports cold water to a water heater. This line connects the home’s plumbing system to the water heater, ensuring a constant supply of water for heating.
The American Water Works Association defines a water supply line as a crucial component in residential plumbing that facilitates the flow of water from the main supply to appliances like water heaters. This definition highlights the essential role of the supply line in maintaining water availability for heating needs.
The water heater supply line typically consists of materials such as copper, PEX, or PVC, each offering distinct advantages. Copper is durable and resistant to corrosion, while PEX is flexible and easy to install. Proper sizing and installation of the supply line are vital for efficient water heater operation.
According to the International Association of Plumbing and Mechanical Officials, an adequately sized water supply line prevents issues like low water pressure and inefficient heating. Proper installation standards ensure the longevity and safety of the plumbing system.
Factors affecting the efficacy of water heater supply lines include pipe diameter, length, and any bends in the line. Insufficiently sized lines can restrict flow, leading to inadequate heating.
The U.S. Department of Energy reports that improper installation can increase energy usage by up to 30%. This inefficiency results in higher utility bills and contributes to a significant portion of home energy consumption.
A well-functioning water heater supply line impacts various dimensions of daily life. It affects household comfort, energy efficiency, and overall water system performance.
Examples include increased energy costs and the potential for scalding due to water temperature fluctuations in inadequately equipped systems. On a larger scale, widespread plumbing inefficiencies can strain municipal water resources.
To improve water heater supply line performance, experts recommend using appropriately sized materials, conducting regular inspections, and updating older systems. Organizations like the U.S. EPA advocate for modernizing water infrastructure to enhance efficiency.
Strategies to mitigate related issues include regular maintenance, upgrading to high-efficiency fixtures, and utilizing smart home technology for monitoring water use and pressure.
What Are the Benefits of Using Flexible, Durable Stainless Steel Braided Hoses?
The benefits of using flexible, durable stainless steel braided hoses include enhanced flexibility, superior durability, resistance to corrosion, improved temperature tolerance, and reduced risk of kinking or bursting.
- Enhanced Flexibility
- Superior Durability
- Resistance to Corrosion
- Improved Temperature Tolerance
- Reduced Risk of Kinking or Bursting
These benefits cater to various industries and applications, enhancing safety and reliability in fluid transfer systems.
1. Enhanced Flexibility:
Flexible stainless steel braided hoses provide exceptional ease of installation. They bend and twist easily to fit into tight spaces without excessive force. For example, in automotive applications, their flexibility allows for smooth routing around engine components. This reduces stress on the hose, minimizing wear over time.
2. Superior Durability:
Durability is a key attribute of stainless steel braided hoses. These hoses withstand high pressure and mechanical stress. A study by the International Journal of Engineering Research and Applications (2015) indicates that stainless steel hoses can handle pressures up to 10,000 PSI, depending on the design. They last longer than rubber hoses, reducing replacement costs over the hose’s life span.
3. Resistance to Corrosion:
Stainless steel braided hoses resist corrosive substances effectively. This is vital in applications involving chemicals or liquids that could damage traditional rubber hoses. According to a 2021 report by the Corrosion Science Journal, stainless steel demonstrates a low corrosion rate, which makes it ideal for industries such as food processing or petrochemical where hygiene and safety are crucial.
4. Improved Temperature Tolerance:
Stainless steel braided hoses perform well in extreme temperature conditions. They maintain functionality from cryogenic temperatures to high heat, which is beneficial in various industrial settings. The ASME (American Society of Mechanical Engineers) recognizes these hoses’ temperature ratings, ensuring they meet safety standards in thermal applications.
5. Reduced Risk of Kinking or Bursting:
The braided design of these hoses provides additional support. It helps prevent kinking, which can impede fluid flow or cause failure. For instance, in hydraulic systems, a kink can lead to catastrophic leaks. Studies show that using braided hoses decreases the likelihood of burst failures, ensuring a safer operational environment.
These benefits establish that flexible, durable stainless steel braided hoses offer numerous advantages across diverse applications. Their properties not only enhance performance but also contribute to overall system reliability and safety.
What Features Should You Consider When Choosing a Water Heater Supply Line?
When choosing a water heater supply line, consider various key features that can impact performance, safety, and installation.
- Type of material
- Diameter of the supply line
- Length of the supply line
- Pressure rating
- Compatibility with fittings
- Corrosion resistance
- Flexibility and ease of installation
- Code compliance
These features each have their own importance and implications for effectiveness and safety.
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Type of Material: The type of material used for the supply line greatly affects durability and reliability. Common materials include copper, PVC, and PEX. Copper is known for its longevity and heat resistance, while PEX offers flexibility and ease of installation. A study by the Plastic Pipe Institute (2020) highlights that PEX has become increasingly popular for residential plumbing due to its resistance to scale and chlorine.
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Diameter of the Supply Line: The diameter of the supply line must match the requirements of the water heater and the plumbing system to ensure optimal flow. Standard diameters range from ½ inch to 3 inches. According to the International Plumbing Code, undersized supply lines can restrict water flow, impacting the heater’s efficiency.
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Length of the Supply Line: The overall length can impact water pressure and heat loss. Shorter supply lines are generally more efficient, reducing heat loss during water transport. The U.S. Department of Energy recommends keeping supply lines to a minimum length to enhance energy efficiency.
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Pressure Rating: The pressure rating indicates how much pressure the supply line can withstand without bursting. Supply lines typically range from 50 PSI to 200 PSI. As noted by the Plumbing and Drainage Institute, ensuring the line’s pressure rating exceeds the incoming water pressure is crucial for safe operation.
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Compatibility with Fittings: Compatibility with various fittings ensures easy connections to the water heater and existing plumbing. Not all materials match well together. The ANSI (American National Standards Institute) emphasizes proper fitting compatibility to avoid leaks and maintain system integrity.
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Corrosion Resistance: The supply line’s resistance to corrosion is vital, especially in environments with hard water. Materials like PEX are known for their resistance to corrosion and scaling. The National Sanitation Foundation has ranked PEX as a material with excellent resistance.
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Flexibility and Ease of Installation: Flexible supply lines can speed up installation and allow for adjustments in tight spaces. PEX, for example, can be bent around existing structures, making it easier to install. Surveys from the Home Improvement Research Institute note that homeowners prefer materials that simplify DIY projects.
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Code Compliance: Ensuring that the supply line meets local plumbing codes is critical for safety and legality. Each region may have specific requirements that impact material choices and installation practices. Local building departments often provide guidance to help homeowners select compliant options.
Which Brands Are Known for Producing the Best Water Heater Supply Lines?
Several brands are well-known for producing the best water heater supply lines.
- SharkBite
- Watts
- BrassCraft
- Fluidmaster
- Eastman
- ProConnect
- Apollo
- R440
- OATEY
These brands offer various attributes that appeal to both professionals and DIY enthusiasts. People often prefer different brands based on their unique needs such as durability, ease of installation, and price point. Some users might argue for the superiority of flexible supply lines as opposed to rigid ones, citing ease of bending and fitting in tight spaces.
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SharkBite:
SharkBite is a leading brand known for its push-fit plumbing connectors. These connectors allow quick and easy installation without the need for additional tools. SharkBite supply lines are made of durable materials, ensuring they can withstand high water pressure and temperature changes. According to a study by the American Society of Plumbing Engineers (ASPE), SharkBite fittings have a high acceptance rate due to their reliability and ease of use in both residential and commercial settings. -
Watts:
Watts is recognized for its high-quality plumbing products, including supply lines. Their supply lines often feature braided stainless steel, providing excellent durability and resistance to corrosion. Watts supply lines also include features such as temperature relief valves, which add an additional safety measure. In consumer reviews, users frequently note the performance and longevity of Watts products, making them a preferred choice among licensed plumbers. -
BrassCraft:
BrassCraft specializes in gas and water supply products. Their supply lines feature solid brass construction and are highly rated for both functionality and aesthetic appeal. BrassCraft supply lines come with various thread options, making them adaptable to different installation requirements. According to consumer report ratings from 2023, BrassCraft supply lines rank high for their reliability and ease of integration into various plumbing systems. -
Fluidmaster:
Fluidmaster is best known for its toilet repair products, but it also manufactures excellent supply lines. Their supply lines feature a unique design for preventing kinking or cracking. Fluidmaster’s materials are also resistant to corrosion, increasing their lifespan. Studies, such as one conducted by Plumbing & Mechanical magazine in 2022, have shown that Fluidmaster products tend to have positive feedback regarding ease of installation and overall durability. -
Eastman:
Eastman offers a wide range of plumbing products, including supply lines that are often budget-friendly. Their supply lines are available in various lengths and materials, accommodating different plumbing needs. While price is a significant selling point, some users argue that lower cost might lead to compromises in quality. Nonetheless, Eastman supply lines are frequently recommended for those looking for cost-effective solutions. -
ProConnect:
ProConnect specializes in affordable plumbing solutions. Their supply lines are often used in residential settings due to their ease of installation and reasonable pricing. ProConnect supply lines typically utilize flexible materials, allowing easier navigation in tight spaces. Customer feedback indicates satisfaction with the value they provide for the price, appealing to DIY home improvement enthusiasts. -
Apollo:
Apollo is a well-respected brand that produces various plumbing supplies, including water heater supply lines. Their products often come with comprehensive warranty options, which can signal quality assurance for consumers. Apollo supply lines are made from durable materials that align with industry standards, promoting sustainability. In a 2023 market analysis by the Plumbing Manufacturers International (PMI), Apollo emerged as a strong contender in terms of warranty coverage satisfaction. -
R440:
R440 specializes in replacement and supply line options. Their products are often noted for their innovative designs and compatibility with various water heating systems. R440 also offers unique features such as temperature gauges that can help maintain efficient water heating. Customer testimonials often highlight the adaptability and customization options provided by R440 supply lines. -
OATEY:
OATEY provides a wide range of plumbing solutions, including supply lines that prioritize ease of installation. Their products often include color-coded fittings that simplify the identification process. OATEY supply lines are favored in plumbing renovations due to their versatility. Industry reviews from 2023 frequently commend OATEY for its commitment to producing high-quality products while maintaining competitive prices.
What Installation Tips Can Help Ensure a Safe and Effective Setup for Water Heater Supply Lines?
To ensure a safe and effective setup for water heater supply lines, follow essential installation tips and best practices.
- Use proper plumbing materials.
- Install shut-off valves.
- Ensure correct line size.
- Maintain clearances and accessibility.
- Check for leaks after installation.
- Insulate pipes where necessary.
- Follow local building codes.
- Consult a professional, if needed.
Considering the importance of proper installation for both safety and efficiency, it’s crucial to understand each tip in detail.
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Use Proper Plumbing Materials: Using the right plumbing materials is essential for ensuring the longevity and safety of water heater supply lines. Common materials include copper, PEX (cross-linked polyethylene), and CPVC (chlorinated polyvinyl chloride). Each material has its advantages and disadvantages, such as corrosion resistance for copper or flexibility for PEX. Research from the American Society of Plumbing Engineers highlights that using a mixture of incompatible materials can lead to unintended chemical reactions and leaks.
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Install Shut-off Valves: Installing shut-off valves allows homeowners to quickly cut off water supply in emergencies. This feature protects against potential water damage and offers convenience during repairs or maintenance. National Fire Protection Association guidelines recommend installing these valves on both hot and cold supply lines for maximum control.
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Ensure Correct Line Size: Sizing the water supply lines correctly is crucial for optimal water flow and pressure. A line that is too small can restrict flow and lead to inadequate hot water supply. The Uniform Plumbing Code provides specific recommendations on line sizes based on distance and fixture requirements, ensuring efficient performance.
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Maintain Clearances and Accessibility: Maintaining clearances around water heater supply lines promotes safety and accessibility. Proper spacing allows for easy access during maintenance and inspection. The National Appliance Manufacturers Association emphasizes a minimum clearance of 18 inches around the heater for effective safety measures.
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Check for Leaks After Installation: Checking for leaks after installation is critical for safety and efficiency. Any leaks can lead to increased water bills and potential water damage. Use a simple visual inspection or a water meter test to confirm there are no leaks present. According to the American Water Works Association, undetected leaks can waste approximately 10,000 gallons of water per year in a single home.
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Insulate Pipes Where Necessary: Insulating hot water supply lines prevents heat loss during transportation, enhancing energy efficiency. It also helps protect pipes from freezing in cold temperatures. The U.S. Department of Energy suggests using foam pipe insulation for optimal thermal efficiency, particularly in unconditioned spaces.
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Follow Local Building Codes: Following local building codes ensures your installation meets safety regulations and standards. These codes may dictate material types, installation practices, and safety measures. It’s essential to check with local building authorities or consult the International Code Council for specific requirements in your area.
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Consult a Professional, if Needed: Consulting a professional plumber can prevent costly mistakes and ensure a safe installation. Experienced professionals can offer insights and ensure compliance with relevant codes and regulations. The Plumbing-Heating-Cooling Contractors Association advises homeowners to hire licensed professionals for complex installations, as they can mitigate risks associated with DIY mistakes.