Solar water heaters help you reduce your energy bills and heat your water in an eco-friendly way. They are a great option for homes and businesses. By using sunlight to heat water, solar water heaters can provide a big chunk of a building’s hot water needs without relying on fossil fuels. They supply hot water whether you live in an off-grid cabin or if your power goes out, and they work well in different climates and can be added to new or existing buildings. In this article, we go over the best solar water heaters to help you make an informed decision on what to invest in.
Key Takeaways
- The best solar water heaters from Rheem, SunEarth, Duda, Heliodyne, and Apricus can significantly reduce your energy bills and provide hot water in an eco-friendly way.
- There are two main types of solar water heaters: active systems (with direct and indirect circulation options) and passive systems, each suitable for different climates and household needs.
- When choosing a solar water heater, factors to consider include climate, household hot water demand, roof orientation, system efficiency, cost, and integration with existing systems.
What Are Solar Water Heaters?
Solar water heaters use sunlight to warm up the water in your home or business. These systems are highly efficient for heating water, whether it is for household use, heating pools, or showers when camping, and they offer significant cost-saving benefits. A collector, usually installed on your roof, captures the sun’s heat. This heat warms up a fluid (either water or a special antifreeze solution) that flows through pipes into a storage tank. The hot fluid then heats the water in the tank, so when you turn on the hot water tap, you get warm water without relying on electricity or gas. It saves you money on your energy bills and helps you reduce your carbon footprint.
How Solar Water Heaters Work
- Solar Collection. Solar collectors, typically mounted on the roof, absorb sunlight.
- Heat Transfer. The absorbed heat is transferred to a fluid (water or antifreeze) circulating through the collectors.
- Storage. The heated fluid flows to a storage tank, where it heats the water for household use.
- Backup Heating. Most systems include a backup heating element for cloudy days or high-demand periods.
Types of Solar Water Heating Systems
There are different types of solar hot water systems, each with its own benefits and uses. Solar water heating systems come in two main types: active and passive. Here is the difference between them:
Active Systems
Active solar water heaters come in two types: direct and indirect circulation systems. In direct systems, household water flows through the collectors, making them suitable for areas without freezing temperatures. Indirect systems, on the other hand, use a special antifreeze fluid to transfer heat, which makes them ideal for colder climates. Which one you choose depends on your region’s climate. Active solar heaters need electric pumps, valves, and controllers to move water, unlike passive systems that use natural convection. Direct systems can also work with existing heating setups, such as using a liquid-to-air heat exchanger for home heating.
Passive Systems
Passive solar water heaters are simpler. They mainly come in two types: integral collector-storage systems and thermosyphon systems. Unlike active systems, they do not need external systems to circulate water. Compared to a conventional water heater, a solar water heater can be more efficient. Integral collector-storage systems use sunlight to preheat water in insulated boxes, suitable for mildly freezing areas. Thermosyphon systems circulate water using natural convection. Despite their simplicity, passive solar heaters are efficient, reliable, and cost-effective. They also last longer and are easier to maintain because they have fewer moving parts. That’s why many homeowners find passive systems appealing.
Benefits of Solar Water Heaters
Using solar water heaters offers several benefits:
- Cost Savings. Solar water heaters help you save money on energy bills because they use sunlight to heat water instead of relying only on electricity or gas. They can lower your energy bills by 50-80%. However, a full solar energy system, which includes photovoltaic (PV) panels, can power the entire home, covering not only hot water costs but also the energy costs of all appliances, making it a more comprehensive and cost-effective solution.
- Positive Environmental Impact. Unlike traditional water heaters, solar water heaters are eco-friendly and reduce your carbon footprint since they rely on a renewable energy source – sunlight. This helps decrease greenhouse gas emissions and help combat climate change.
- Low Maintenance. Solar water heaters are reliable and require minimal maintenance, so you do not have to worry about frequent repairs. The best solar water heaters thrive in cold climates.
- Energy Independence. Solar water heaters provide continuous hot water, even during power outages.
Top 5 Solar Water Heaters
Compare Top Solar Water Heaters
The best solar water heater for your needs may vary depending on factors such as your geographic location, available technology, and your individual preferences. However, here are our picks of five well-regarded solar water heater brands and models that were recognized for their performance, high quality, reliability, and efficiency.
Rheem Solar Water Heaters
Established in the 1920s, Rheem is a reputable American manufacturer of heating, cooling, and water heating products. It is known for its high-quality water heating systems with tank, tankless, and solar energy-compatible heaters, making it a popular choice among consumers. Rheem offers several types of solar water heaters, including active closed-loop systems, active open-loop systems, and passive systems, catering to different climates and household needs. Here are the pros and cons of Rheem solar water heaters:
| Pros | Cons |
| Energy efficiency: Rheem solar water heaters harness the power of the sun, a renewable energy source, to heat water, significantly reducing energy consumption and utility bills. | High initial cost: The upfront cost of purchasing and installing a Rheem solar water heater can be substantial, making it a significant investment for homeowners. |
| Environmental benefits: By utilizing solar energy, these systems contribute to a lower carbon footprint and promote sustainability. | Dependence on sunlight: Solar water heaters rely on direct sunlight to function effectively, which can be a limitation in areas with frequent cloud cover or seasonal changes in sunlight exposure. |
| Long-term cost savings: While the initial investment in a solar water heater may be higher, the long-term savings on energy costs can offset the upfront expense over time. | Space requirements: Solar water heaters typically require a suitable roof or ground area for the installation of solar collectors, which may not be feasible for some homes or properties. In comparison, solar panels for electricity needs also require significant space, but they can be more versatile in placement. |
| Durable construction: Rheem solar water heaters are known for their robust and long-lasting construction, ensuring reliable performance for many years. | Limited hot water capacity: In some cases, especially for larger households, the hot water capacity provided by a solar water heater may not be sufficient, requiring supplemental heating or a larger system. |
SunEarth is a leading manufacturer in the solar water heating industry, known for its innovative and durable products. Founded in 1978, the company offers both active and passive systems tailored to various climates and hot water demands.
One of the key strengths of SunEarth solar water heaters is their quality construction. The company uses durable materials and advanced manufacturing techniques to ensure long-lasting performance and reliability. Homeowners and contractors appreciate the easy installation process, which saves time and reduces costs. Here is a breakdown of SunEarth solar water heaters:
| Pros | Cons |
| Energy efficiency: SunEarth’s solar water heaters feature an innovative dual-tank design that maximizes energy efficiency by separating the hot water storage from the solar collection process. | High cost: SunEarth’s commitment to quality components and advanced technology comes with a higher upfront cost compared to some conventional water heating systems. |
| Long-term cost savings: While the initial investment in a solar water heater may be higher, the long-term savings on energy costs can offset the upfront expense over time, providing a favorable return on investment. | Periodic maintenance: While generally low maintenance, SunEarth systems do require periodic checks and cleaning to maintain efficiency, which can be an inconvenience for some users. |
| Durability: SunEarth solar water heaters are built with high-quality materials, providing reliable performance for many years. | Scale buildup risk: In areas with hard water or high mineral content, SunEarth’s systems may be more susceptible to scale buildup, which can reduce efficiency and require more frequent maintenance or component replacements. |
| Versatility: SunEarth offers a wide range of system sizes and configurations, allowing homeowners and businesses to tailor the solar water heating solution to their specific hot water demands. | |
| Easy installation: With a focus on user-friendly installation, SunEarth’s systems are designed for easy integration into existing plumbing setups. |
Harnessing the power of the sun, Duda’s solar water heaters offer an eco-friendly and cost-effective solution for hot water needs. While compact, Duda’s heaters pack a punch, efficiently converting sunlight into hot water for households and businesses alike. The sleek, low-profile design complements any rooftop appearance and blends functionality with style. These innovative systems seamlessly integrate with existing plumbing, providing an easy transition to renewable energy. Here are the pros and cons of Duda solar water heaters:
| Pros | Cons |
| Advanced evacuated tube technology: Duda uses highly efficient evacuated tube solar collectors, which can capture and retain heat more effectively than traditional flat-plate collectors, enhancing the system’s overall performance. | Limited compatibility with certain roof types: These solar water heaters may not be suitable for all roof types, particularly those with complex or unconventional designs, limiting their installation options in some cases. |
| Integration with existing water heaters: Many of Duda’s solar water heaters are designed to integrate seamlessly with conventional water heaters, providing a hybrid solution that maximizes energy savings. | Potential for overheating: In regions with exceptionally high solar radiation, Duda’s highly efficient evacuated tube collectors can sometimes lead to overheating, necessitating additional safety measures or adjustments. |
| Proprietary control systems: Duda has developed proprietary control systems that optimize the operation of their solar water heaters, ensuring efficient energy transfer and minimizing heat loss. | Specialized installation requirements: While Duda’s systems are designed for easy installation, their advanced technology may require specialized training or expertise, potentially increasing installation costs in some regions. |
| Aesthetically pleasing designs: Duda’s solar water heaters are known for their sleek and modern designs, blending seamlessly with various architectural styles and improving the visual appeal of residential and commercial properties. | Limited availability in some markets: These solar water heaters may have limited availability or distribution channels in certain geographic regions, making it challenging for some customers to access their products. |
| Monitoring and analytics: Duda offers advanced monitoring and analytics tools, allowing users to track the system’s performance, energy savings, and environmental impact. | Relatively higher maintenance needs: Compared to some competitors, Duda’s solar water heaters may require more frequent maintenance or servicing to ensure optimal performance, potentially increasing the long-term cost of ownership. |
Heliodyne has been an important player in the solar water heating market since 1976, offering advanced solutions for residential and commercial applications. Known for their high-performance flat plate collectors, Heliodyne systems are designed to maximize energy efficiency and durability. Heliodyne products are engineered to withstand different weather conditions to provide a consistent hot water supply year-round. The closed-loop design of Heliodyne solar water heaters safeguards against freezing and mineral buildup in water. So, whether you’re in a colder region or a sunny one, you get the best performance from your solar setup with Heliodyne.
With easy installation, Heliodyne is a favorite among contractors and homeowners. By using solar power, Heliodyne water heaters provide a cost-effective and environmentally friendly alternative to traditional heating methods. Here are the pros and cons of Heliodyne solar water heaters:
| Pros | Cons |
| Advanced evacuated tube technology: Similar to Duda solar water heaters, Heliodyne products incorporate advanced evacuated tube technology, which minimizes heat loss and maximizes energy efficiency, even in cloudy conditions. | High cost: Heliodyne’s solar water heaters are efficient but may initially cost more than conventional systems, However, long-term energy savings and incentives can offset this investment. |
| Eco-friendly manufacturing: Heliodyne’s commitment to sustainability extends beyond its products, as it uses eco-friendly manufacturing processes. | Professional installation: Proper installation is crucial for maximizing the performance of Heliodyne’s solar water heaters, and this often requires the expertise of certified professionals, which can add to the overall costs. |
| Durability: With a focus on durability, Heliodyne’s solar water heaters are built to withstand harsh weather conditions and provide long-lasting performance and a reliable return on investment. | Dependence on sunlight: In areas with limited sunlight exposure, such as regions with frequent cloud cover or shorter daylight hours, the performance of Heliodyne’s solar water heaters may be affected. While their advanced technology mitigates this issue, homeowners in these regions should consider supplemental heating options. |
| Flexibility: Heliodyne offers a wide range of system configurations to accommodate various roof sizes and orientations and ensure optimal energy capture regardless of the installation site. |
Apricus is a respected brand in the solar thermal industry, offering a wide range of solar water heater solutions for residential, commercial, and industrial applications. Similar to Duda, Apricus solar water heaters use evacuated tube collectors, which are highly efficient in capturing and retaining heat, even in colder climates. Their systems are built with quality materials, offering longevity and resilience against various weather conditions. Apricus combines cutting-edge technology with eco-friendly solutions, making their solar water heaters both effective and sustainable. Here are the pros and cons of Apricus water heaters.
| Pros | Cons |
| High efficiency: Apricus solar water heaters use advanced evacuated tube technology for optimal solar energy absorption and minimal heat loss, ensuring impressive thermal efficiency. | Cost: Apricus systems have a higher initial investment compared to conventional water heaters. This may deter cost-conscious consumers, despite the long-term savings. |
| Durability: Built with strong materials, these systems are extremely durable and long-lasting. | Availability: Apricus has limited availability and distribution channels in certain regions, making sourcing and installation more challenging. |
| Versatility: The company offers systems tailored for both residential and commercial applications, catering to diverse requirements. | New to the market: Apricus is a relatively new brand in the solar water heating market, lacking the extensive track record of more established competitors. |
| Stylish integration: Apricus prioritizes aesthetically pleasing designs that seamlessly integrate into various architectural styles, enhancing curb appeal. | Integration limitations: Limited options for integrated energy monitoring and smart home integration compared to some rival offerings. |
Average Cost of the Best Solar Water Heaters
Table 1: Average Cost Range by Brand
| Brand | Low-End Cost | Mid-Range Cost | High-End Cost |
| Rheem | $2,500 | $4,000 | $6,500 |
| SunEarth | $2,800 | $4,500 | $7,000 |
| Duda | $2,300 | $3,800 | $6,000 |
| Heliodyne | $3,000 | $5,000 | $8,000 |
| Apricus | $3,200 | $5,500 | $8,500 |
Note: Costs include equipment only and do not factor in installation costs.
Table 2: Average Cost per Square Foot of Collector Area
| Brand | Cost per sq ft |
| Rheem | $90 – $120 |
| SunEarth | $100 – $130 |
| Duda | $85 – $110 |
| Heliodyne | $110 – $150 |
| Apricus | $120 – $160 |
Table 3: Estimated Installation Costs
| System Size | Average Installation Cost |
| Small (1-2 people) | $1,500 – $2,500 |
| Medium (3-4 people) | $2,000 – $3,500 |
| Large (5+ people) | $3,000 – $5,000 |
Additional Cost Considerations:
Rheem:
- Often offers package deals that include installation
- Provides a 6-year limited warranty on parts
- Some models eligible for a 30% federal tax credit
SunEarth:
- Known for durable, long-lasting systems
- Offers a 10-year warranty on collectors
- Higher initial cost often offset by longer lifespan
Duda:
- Generally the most affordable option
- Offers a 5-year warranty on parts
- May have higher maintenance costs over time
Heliodyne:
- Premium brand with high-efficiency systems
- Offers a 10-year warranty on collectors and 5 years on parts
- Higher initial cost but potentially greater energy savings
Apricus:
- Specializes in evacuated tube collectors, which are typically more expensive
- Offers a 15-year warranty on tubes and 5 years on other components
- May perform better in colder climates, justifying the higher cost
Choosing the Right Solar-Powered Water Heater for Your Home
Before buying a solar water heater for your home, consider the following key factors to ensure you get the most out of your investment:
- Climate and Sunlight Exposure. The amount of sunlight your home receives throughout the year will play a significant role in determining the type and size of solar water heater you’ll need. If you live in a consistently sunny and warm area, a passive system may be sufficient. However, if you experience cooler temperatures or periods of cloud cover, an active system with a larger collector area may be more appropriate.
- Household Hot Water Demand. The size of your household and your hot water usage patterns will influence the capacity and storage needs of your solar water heater. Larger families or homes with higher hot water demands will likely need a system with a larger storage tank or multiple collectors to meet their needs.
- Roof Orientation and Slope. The positioning and angle of your roof can impact the performance of your solar water heater. Ideally, the collectors should be oriented towards the south (in the northern hemisphere) and positioned at an angle that maximizes sunlight exposure during the year.
- System Efficiency and Performance. High-efficiency ratings and performance guarantees save you money and provide the hot water you need. When shopping for solar water heaters, consider factors such as heat loss, insulation quality, collector efficiency, and overall system design to get optimal performance and energy savings. Different types of solar hot water systems offer varying levels of efficiency and performance, so it is important to choose one that suits your specific needs and climate conditions.
- Cost and Payback Period. Assessing the initial cost of the solar water heater system, including installation expenses, compared to potential long-term energy savings is critical for making a smart financial decision. Before buying a solar water heater, calculate the payback period to determine the economic feasibility of investing in solar energy based on your local energy prices, available incentives, and financing options.
- Available Space and Roof Load. Depending on the type and size of the system you choose, you will need to make sure that you have sufficient space on your roof or property to accommodate the solar collectors and storage tank. You also need to make sure that your roof is strong enough to hold the solar water heater. Its weight can add stress to the roof.
- Integration with Existing Systems. If you already have a conventional water heater in place, you may be able to integrate a solar water heater into your existing system, reducing the overall installation cost and complexity. Some solar water heaters can be designed to work together with your current water heater, providing supplemental heating and reducing your reliance on traditional energy sources.
Frequently Asked Questions about Solar Water Heaters
What is the best solar water heating system?
The best solar water heating system depends on factors such as location, climate, household size, budget, and individual preferences, as different systems provide different benefits like efficiency, durability, aesthetics, and cost-effectiveness.
How do I choose the best solar water heating system for my needs?
To choose the best solar water heating system for your needs, look at factors like your geographic location, available roof space and orientation, household hot water demand, budget, and preferred system type (active or passive, evacuated tube or flat plate) while considering reputable brands with proven track records.
How long does it take for a solar water heating system to pay for itself?
The payback period for a solar water heating system can range from 2 to 10 years, depending on factors such as system cost, local energy rates, available solar radiation, and any incentives or rebates offered in your area. While the initial solar water heater cost can be higher compared to traditional water heaters, the long-term savings from reduced utility bills and eligibility for solar tax credits make it a cost-effective investment.
What maintenance is required for solar water heaters?
Solar water heaters require periodic maintenance tasks like cleaning the collector surface, inspecting and potentially replacing worn components like pumps or valves, having proper fluid levels, and checking for any leaks or other issues that could impact system efficiency and longevity.
Related Articles
Efficient Home Heating with Solar Air Heater
Solar Pool Heating: An Efficient and Eco-Friendly Choice
The Future of Clean Water: Solar Water Purifiers
DIY Solar Systems: How to Build Your Own Solar Panels