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Advantages of Flat Plate Solar Water Heater
·Easy to install: Just need to assemble the bracket and connect the cold and hot water pipes.
·Safety: The thermostat provides overheat protection when the temperature is too high.
·Energy-saving and environmentally friendly: Solar energy is used for heating daily, and the electric heating element is only used on overcast or rainy days.
Your Trusted Flat Plate Solar Water Heater Manufacturer in China
Haoha flat plate solar water heaters come as complete units that you can integrate to achieve a specific heating load capacity for your process. Each flat plate solar water heater is equipped with a thermostat, heat exchanger, temperature-pressure valve and plumbing fittings, making it easy to install and use.
The flat plate solar water heater is suitable for areas with abundant sunlight. When there is ample sunlight, they don’t require additional heating from other energy sources, significantly reducing operating costs. The solar and electric hybrid system ensures a 24-hour supply of hot water.
Additionally, the flat plate solar water heater can be equipped with a controller to monitor water level and temperature in real time, making it more convenient and intelligent during use.
Therefore, if you are looking for a water heater that can provide a continuous supply of hot water, then you need Haoha’s flat plate solar water heater. Partner with Haoha today to custom flat plate solar water heater—contact our engineers now for free consultations.
The 150L capacity provides domestic hot water for 2–3 people, making it ideal for small households with fewer occupants.
The 200L capacity provides domestic hot water for 3–5 people, making it suitable for standard households or small-scale residential use.
The 300L capacity provides domestic hot water for 6–7 people, making it suitable for large households, villas, or small hotels.
The jacket layer can use antifreeze as the medium, allowing it to withstand temperatures below 0°C.
Designed as a pressurized system (standard pressure 0.6–1.0 MPa), it ensures a stable water flow.
Equipped with two flat plate solar collectors, the system has a large solar collection area, enabling efficient heat absorption. It heats water quickly and maintains a stable temperature.
Accessories We Use for Your Flat Plate Solar Water Heater
The flat plate solar collector features deoxidised high-phosphorus copper, ensuring fast heat transfer and excellent corrosion resistance. The absorber plate core uses imported blue film for high solar absorption efficiency. The surface is made of tempered glass with strong explosion-proof performance.
The standard flat plate solar water heater comes with a 2KW electric heating element, providing rapid water heating on cloudy or rainy days. And equipped with a thermostat and temperature-pressure valve that automatically releases excess pressure inside the tank. The thermostat is factory-set to maintain the desired temperature and will automatically activate overheat protection to ensure safe and reliable operation of the system.


Customized Option for All Your Flat Plate Solar Water Heaters
According to your project demands, we can customize the flat plate solar water heater for you. For example, we can customize the capacity, the thickness of the steel plates, and the enamel coating thickness. To meet your hot water requirements, your local water pressure requirements, and to reduce the risk of corrosion inside the tank. Also offer packaging options, including carton packaging, bubble column protection and wooden frames. If you have any other customization requirements, please feel free to contact our engineers to create a flat plate solar water heater solution just for you.
Jacket vs Water-Circulating
The flow channels of the flat plate solar collector are connected to the jacketed layer of the tank. Antifreeze or heat transfer oil circulates through the channels, absorbing solar energy to heat the water without directly contacting the domestic water supply. While the efficiency is slightly lower than that of water-circulation flat plate solar water heaters, the system offers excellent freeze protection.
The flow channels of the flat plate solar collector are in direct contact with the water inside the tank. This direct heat exchange allows fast heat transfer and high heating efficiency. However, it is not suitable for cold regions, as the flat plate solar collector is prone to freezing and cracking.
More About Our Flat Plate Solar Water Heater
Flat Plate Solar Water Heater Technical Specifications
- Technical Parameter Table
- Spare Parts
| Circulating mode | Product Model | Capacity (Liters) | Collecting Area(㎡) | Flat Plate Solar Collector | Inner/Outer Tank Dia.(mm) | Working pressure of system (Mpa) | Working pressure of jacket(Mpa) | ||
| L (mm) | W (mm) | H (mm) | |||||||
| Indirt | WT-150L- 2m2 | 150 | 2 | 2000 | 1000 | 80 | φ496/φ600 | 0.7 | 0.2 |
| WT-200L- 2.5m2 | 200 | 2.5 | 2000 | 1250 | 80 | φ496/φ600 | 0.7 | 0.2 | |
| Material Details | |||||||||
| Water Tank | Inner Tank | Special Steel Plate With Enamel Coating(2.5mm thick), same as jacket tank | |||||||
| Outer Tank | Color Steel Plate(0.4mm thick) | ||||||||
| Insulation Layer | Polyurethane foam(50mm thick) | ||||||||
| Electric Heater | 2KW and 3KW (220V,50HZ) | ||||||||
| Flat Plate Solar Collector | Cover | Tempered Glass 3.2mm | |||||||
| Absorber | Aluminium Plate/Copper | ||||||||
| Coating | Selective absorb painting | ||||||||
| Insulation | Rock wool and PU | ||||||||
| Sealing profile | EPDM | ||||||||
| Bracket | Galvanized steel with plastic spraying (1.5mm/2mm thick) | ||||||||
| fittings included all related one | |||||||||
| Remark:The above system include pressurized enamel coated water storage tank,falt plate panel,brackets,imported P/T valve,one-way&pressure release valve, related copper connectors, insulation pipes, medium liquid | |||||||||



A flat plate solar water heater integrates the flat plate solar collector and the storage tank into a single system. It uses the solar collector to absorb sunlight and heat the domestic water in the tank, forming an efficient solar water heating system.
High aesthetic appeal and versatile installation options. Uses solar energy for heating on sunny days, resulting in low energy consumption. Easy to maintain with minimal maintenance costs.
Absolutely, Haoha will offer customization services from design to delivery, including aspects like capacity, the thickness of the steel plates, and the enamel coating thickness.


































