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Upgrade to pre-heated solar water heaters with cutting-edge heat exchange technology for efficient, eco-friendly water heating. Enjoy superior water quality using clean, direct tap water, automatic operation for hassle-free use, high-pressure durability, and a scale-free system that ensures optimal performance and long-lasting efficiency.
| 150L 200L 240L 300L Pre-heated Solar Water Heaters | |||||
| Specification | |||||
| MODEL: | Solar Vacuum Tube | Absorber Area | Capacity | Loading Qty/sets | |
| Item No. | Qty /【pcs】 | Size /【mm】 | 【M2】 | 【L】 | 40HQ |
| PH-58/1800/15 | 15 | Φ58 X 1800 | 1.995 | 150 | 126 |
| PH-58/1800/20 | 20 | Φ58 X 1800 | 2.66 | 200 | 94 |
| PH-58/1800/24 | 24 | Φ58 X 1800 | 3.192 | 240 | 79 |
| PH-58/1800/30 | 30 | Φ58 X 1800 | 3.99 | 300 | 63 |
| 150L 200L 240L 300L Pre-heated Solar Water Heaters | |||||
| Technicacl Parameters | |||||
| WATER STORAGE TANK SPECIFICATION | |||||
| Material of out tank | Stainless Steel/Color coated steel | ||||
| Material of inner tank | Food grade SUS304-2B Stainless Steel – | ||||
| Tank insulating layer | High-density polyurethane foamed | ||||
| Tank size | 360/470mm | ||||
| Inlet and outlet hole | Male G 3/4” | ||||
| Welding: | Argon arc welding | ||||
| Copper coil diameter | 12mm/16mm/19/25mm | ||||
| Copper coil length | 15~30meters | ||||
| Max pressure | Coil max. Working pressure: 0.8Mpa. | ||||
| EVACUATED VACUUM TUBESN SPECIFICATION | |||||
| Tube structure | All-glass double deck co-axial structure | ||||
| Glass material | High borosilicate 3.3 glass | ||||
| Outer tube diameter and glass thickness | Ø58±0.7mm; Glass thickness 1.6±0.15mm | ||||
| Inner tube diameter and glass thickness | Ø47±0.7mm; Glass thickness 1.6±0.15mm | ||||
| Tube dimension | 58*1800mm | ||||
| Absorptive coating Structure | Cu/SS-ALN(H)/SS-ALN(L)/ALN | ||||
| Absorptive coating Sediment method | Three targets magnetron sputtering plating | ||||
| Absorptive coating Specific absorption | 0.93-0.96(AM1.5) | ||||
| Absorptive coating Emission ratio | 0.04-0.06(800C±50C) | ||||
| Vacuum tightness | 5.0×10¯³ Pa | ||||
| Idle sunning property parameters | 260-300 m².C/KW | ||||
| Average heat loss coefficient | ULT=0.4~0.6W/(M2.0C) | ||||
| Resistant Hail | ≤25mm | ||||
| Useful life | 15 years | ||||
| BRACKETSPECIFICATION | |||||
| Bracket: | Flexibility Solar Bracket Suitable for Both Slope and Flat Roof | ||||
| Bracket angle: | 16/25/30/38/45 degree | ||||
| Fastening pieces: | Stainless steel. | ||||
| COMPONENTS | |||||
| Back up system.(Electric heater element) | Anti-drying-out electric heater element(220v/50hz) | ||||
| Controller | TK-7 or TK-8A | ||||
| Assistant tanks | 5 liters assistant tank | ||||
1.Vacuum Tube Heat Absorption:
The vacuum tubes capture the sun’s rays and convert them into heat.
2.Heat Transfer to Water:
The heat generated in the tubes is transferred to the water inside them.
3.Natural Circulation:
As the water temperature rises, its density decreases. This causes the hot water to float upwards into the storage tank, while cooler water from the tank flows down into the tubes. This cycle continues naturally.
4. Indirect Water Usage:
The system heats the water in the tank, but the heated water is not used directly. Instead, cold water enters a heat exchanger.
5.Heat Exchange Process:
The cold water in the heat exchanger is heated by the hot water circulating through the system.
6.Heated Water for Use:
The now-heated water exits the heat exchanger from the other side, ready to be used.
✅The pre-heated solar water heater is a new product that combines the benefits of both non-pressurized and separated pressurized solar water heaters.
✅The system integrates a copper coil inside the non-pressurized water tank, which resolves common issues found in traditional solar water heaters, such as limited hot water volume, long heating times, insufficient water output, and poor water quality.
✅The innovative “twice heat exchange” technology ensures rapid and efficient heating, delivering large quantities of hot water with high thermal efficiency.
1. Superior Water Quality:
The system uses direct tap water, ensuring that the water is clean and fresh, free from sediment or impurities.
2. Pressure Endurance:
The thick copper coil is designed to withstand high pressures, ranging from 6 to 12 bars, ensuring durability and reliability.
3. Automatic Operation:
The system is fully automatic, with a feed tank positioned at the top. Simply open the tap, and the system will automatically supply hot water for use.
4. No Scale Build-Up, High Efficiency:
The water in the tank is not used to directly heat the coil, which helps prevent scale build-up. As a result, the tank water remains consistently hot, the vacuum tubes stay clean, and the system operates with greater efficiency.
A pre-heated solar water heater uses solar energy to heat water in a non-pressurized tank. The hot water transfers its heat through an inbuilt 316L stainless steel heat exchanger coil, delivering clean and hygienic hot water to your home. This design ensures stable operation, efficient heat transfer, and long service life.
The 316L stainless steel coil offers exceptional corrosion resistance, especially against chlorine and salt, making it ideal for areas with hard or coastal water. It ensures hygienic, durable, and long-lasting performance, outperforming standard 304 stainless steel or copper coils.
Yes. The tank itself is non-pressurized, but the built-in 316L coil allows the system to connect to pressurized water networks safely. This enables steady water flow for showers, taps, and household use while protecting the solar tank from high pressure.
Even during cloudy or rainy days, the pre-heated solar water heater can work efficiently with an auxiliary electric heater or backup system. This hybrid operation guarantees continuous hot water supply year-round while maximizing solar efficiency on sunny days.
It provides energy savings, long service life, corrosion resistance, and clean water supply. The 316L heat exchanger coil allows full separation between the solar circuit and user water, ensuring hygienic performance and compatibility with modern pressurized systems.
Maintenance is minimal. To keep your solar water heating system at peak performance, clean the vacuum tubes regularly and check the heat exchanger for scaling every 6–12 months. With proper care, the system can last over 15 years.
Yes. The system is ideal for both cold and coastal regions. The 316L coil resists corrosion from salty air, and optional antifreeze protection can be added to prevent freezing in sub-zero conditions.
The 316L stainless steel heat exchanger has an expected service life of 15–20 years, matching the durability of the solar tank. It resists scaling, corrosion, and thermal stress, ensuring long-term reliability.
Absolutely. The pre-heated solar water heater can be connected as a pre-heating stage to existing gas or electric water heaters, reducing energy bills and extending the backup heater’s lifespan.
The system should be installed facing true south (northern hemisphere) or true north (southern hemisphere) with a tilt angle matching your local latitude. The base must be firm and stable, and plumbing should ensure smooth circulation and proper pressure balance for maximum performance.
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For Any Queries, Please Feel Free to Contact Us:
Mobile: +86 180 0660 1051
Email:info@riwatt.com
Website:www.riwatt.com
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