Solar Heat Water Heater

I. Product Introduction

The flat-panel split-type solar water heater (Solar Heat Water Heater) is an efficient pressurized solar water heating system specially designed for overseas households, apartments, and small commercial spaces. The product adopts a split structure, with the flat-panel collector and the 316 stainless steel water tank installed separately - the collector can be installed on the roof, balcony or wall, while the water tank is placed indoors, attic or equipment room, perfectly adapting to various buildings in regions such as Europe, Australia, and Southeast Asia. The capacity supports customization from 100L to 400L, precisely meeting the hot water needs of 2-6 person households, small guesthouses and offices. 

The flat plate collector is equipped with a high-strength aluminum alloy frame and low iron tempered glass. The interior features a full copper flow channel, and the surface is covered with a highly selective heat absorption coating (blue titanium film). The absorption rate is ≥ 95%, and the emission rate is ≤ 5%. Its flat structure is modern and sleek, enabling solar energy integration with buildings (BIPV/T). It does not burst pipes, accumulates dust, and is easy to maintain. It has obtained international certifications such as Solar Keymark and CE, and complies with European standards. 

The inner liner of the water tank is made of 316 food-grade stainless steel, which has extremely strong resistance to chloride ion corrosion. It is particularly suitable for coastal areas with high salt spray (such as Australia, the Middle East, and island regions in Southeast Asia) and areas with acidic and hard water. The water tank can withstand a pressure of 0.6 MPa (tested at 1.2 MPa), and the water pressure is constant, providing a bathing comfort comparable to that of an electric water heater. All materials comply with drinking water safety standards such as WRAS and ACS. Compared to traditional 304 stainless steel, 316 has significantly enhanced corrosion resistance, ensuring a service life of over 15 years. 

II. Technical Parameter Table 

Flat Plate Solar Collector

Stainless steel direct solar water heater

III. Working Principle

The flat-panel split-type solar water heater operates based on the principle of forced circulation indirect heat exchange:

1. Solar heat collection: Sunlight passes through the low-iron tempered glass and is absorbed by the heat-absorbing coating, converting into thermal energy and heating the anti-freezing medium (propylene glycol) in the flow channels of the flat-panel collector.

2. Temperature difference circulation: When the outlet temperature of the collector is 5-8℃ higher than the temperature of the lower part of the water tank, the intelligent controller activates the circulation pump, pumping the high-temperature medium into the built-in coil of the water tank. The heat is transferred through the coil wall to the domestic water in the water tank, and the cooled medium returns to the collector, forming a circulation.

3. Auxiliary heating: When the water temperature in the water tank is lower than the set value (such as 45℃) and solar energy is insufficient, the controller automatically activates the electric heating element or links to an external heat source to ensure continuous hot water supply.

4. Pressure-bearing water supply: The water tank is directly connected to the water supply pipeline. When the hot water tap is opened, cold water is pushed into the bottom of the water tank, and hot water flows from the top. The water pressure is the same as that of the tap water, and multiple users can use water simultaneously while maintaining stability.

5. Anti-freezing protection: When the temperature is low, the controller automatically activates the circulation pump or the heating belt to prevent the collector and the pipeline from freezing. It is suitable for cold regions (such as Northern Europe, Canada). 

IV. Product Advantages

1. 316 Stainless Steel Water Tank, Super Strong Corrosion Resistance

The inner liner of the water tank is made of 316 stainless steel, which has a much stronger resistance to chloride ion corrosion than 304. It is particularly suitable for coastal areas, high salt spray environments, and areas with poor water quality. The service life can last up to 15 years, significantly reducing the replacement cost.

2. Flat Collector, Integrated with Building

The flat collector has a smooth and modern appearance and can be embedded in the roof, balcony, or wall without damaging the architectural beauty. It is highly efficient in low light conditions, does not burst the pipes, or accumulate dust, and has extremely low maintenance costs. It has passed Solar Keymark certification and complies with European standards.

3. Aluminum Alloy Supports, Lightweight and Corrosion Resistant

The system is equipped with aluminum alloy supports, which are lightweight, strong, and resistant to oxidation. The installation is convenient, especially suitable for rooftop and balcony installations, avoiding the rusting problem of traditional galvanized supports and extending the overall system lifespan.

4. Capacity 100L - 400L, Customized

From 100L to 400L, the capacity can be customized as needed, precisely matching 2-6 person households, small apartments, and commercial spaces. The volume is compact, suitable for installation in limited spaces such as balconies and equipment rooms.

5. Flexible Design and Installation

The roof can be a flat roof or a sloping roof. Different angles of supports are designed for different roof types to adapt to various building structures.

6. Intelligent Control, Energy Saving and Convenient

The intelligent controller automatically prioritizes the use of solar energy. In cloudy or rainy days, it automatically switches to auxiliary heating. It can be optionally equipped with a Wi-Fi module, allowing remote monitoring of water temperature and setting heating time through a mobile app. It can save energy costs by 60%-80% annually, meeting the European ErP energy efficiency standards.

7. Pressure-Resistant Operation, Comfortable and Constant Temperature

The system has a pressure of 0.6 MPa, with the water pressure being the same as that of the tap water. The bathing experience is stable, completely eliminating the problems of thin water flow and large temperature fluctuations in traditional solar energy systems, meeting the comfort requirements of European users. 

V. Factory Advantages

Our company has been dedicated to the research and manufacturing of split solar water heaters for 15 years. We possess a complete industrial chain and extensive export experience, and are trusted OEM/ODM partners by overseas customers.

1. International Certifications: We have obtained certifications such as ISO9001, ISO14001, Solar Keymark, and CE. Our products are sold in 50+ countries including Europe, Australia, the Middle East, Southeast Asia, and South America.

2. Core Self-production: We have fully automated welding lines for flat plate collectors, CNC processing lines for 316 stainless steel water tanks, and high-pressure foaming assembly lines. Key components are produced independently, ensuring full control over quality throughout the process.

3. Specialization in 316 Stainless Steel: We use high-quality 316 stainless steel sheets, with automatic argon arc welding and passivation processes, to ensure that weld seams are corrosion-resistant. We pass 0.7MPa pressure tests and conduct 100% factory inspections.

4. Capacity Customization Capability: We support customization of any capacity from 100L to 400L. We offer OEM/ODM services, with flexible minimum order quantities to meet the demands of overseas small and medium-sized orders.

5. After-sales Guarantee: The entire machine is covered by a 5-year warranty. We provide English installation videos, technical manuals, CAD drawings, and remote guidance. 

VI. List of Accessories 

VII. Installation Precautions

1. Orientation and inclination of the collector: Facing south (northward in the southern hemisphere) or within 15° to the west, the inclination should be within ±10° of the local latitude. Avoid obstructions.

2. Water tank: A 200L - 400L water tank with full load weighs approximately 450kg. Confirm the floor load-bearing capacity.

3. Circulation pipeline: The length of the solar side circulation pipeline should not exceed 25 meters. It needs to be insulated (≥30mm), and an electric heating belt should be added for the outdoor section to prevent freezing (in cold regions).

4. Anti-freezing fluid addition: Configure the concentration of the anti-freezing fluid according to the local minimum temperature (-15℃ to -35℃). Regularly check the liquid level and pH value after system operation.

5. Electrical connection: The controller, circulation pump, and auxiliary heat source should be on separate circuits. Install an earth leakage protection switch and ensure reliable grounding, in accordance with local electrical standards.

6. Pressure test: After installation, conduct a 1.2MPa water pressure test on the water tank and the collector side separately. Maintain the pressure for 30 minutes without leakage. 

VIII. Application Cases 

IX. Development Trends

1. 316 stainless steel becomes the standard for high-end products: With an increase in projects in coastal areas and those with high requirements, 316 stainless steel, due to its superior corrosion resistance, is gradually replacing 304 and has become the mainstream for high-end products exported to Europe and Australia.

2. Miniaturization and customization of capacity: The 100L-400L capacity range has seen a significant increase in demand as it is suitable for households and small apartments. Customization according to needs has become the core demand of overseas distributors and engineering contractors.

3. Smart IoT and remote operation: Wi-Fi/4G controllers have become standard equipment. Users and engineering contractors can remotely monitor, set parameters, and diagnose faults through mobile apps, significantly reducing service costs.

4. Multi-energy complementarity becomes widespread: Solar energy + electric/heat pump/gas combination systems have become standard configurations. The intelligent controller automatically switches to achieve the lowest operating cost throughout the year.

5. Deepening of building integration: Flat plate collectors are deeply integrated with photovoltaic modules, balcony railings, and curtain walls. PVT (photovoltaic-thermal) integrated products have begun to enter the overseas market. 

Summary: The flat-panel split-type solar water heater (Solar Heat Water Heater) features the aesthetic and efficient design of the flat collector, the superior corrosion resistance of the 316 stainless steel water tank, and the flexible customization of 100L - 400L full-capacity options, making it an ideal energy-saving hot water solution for overseas households and small commercial establishments. We sincerely invite global distributors, resellers, and engineers to join hands and collaborate to jointly explore the green energy market! 

Contact us immediately to obtain the 316 stainless steel system solution, export quotations and channel cooperation policies! 

Website: www.btesolar.com