CE, ISO, Keymark, five years warrranty, 6years export experience, manufacturer since 2000 Contact us
1. Qal solar water heater advantages:
1>CE, ISO. Five years warranty, long life span
2>Most competitive price and high quality
3>Quality assurance comply with ISO 9001-2008
4>Product quality in compliancee with CE
5>Fast delivery and rich export experience
6>OEM and ODM service
2. QAL solar water heaterheating/collector tube details:
1>QAL solar water heater/heating/collector tube structure: All-glass double deck co-axial structure
2>Tube size of our solar water heater/heating/collector: 58*1800mm, or 47*1500mm
3>Our solar water heater/heating/collector glass material: High orosilicate 3.3 glass
4>QAL solar water heater/heating/collector tuter tube diameter and glass thickness: Ø 58± 0.7mm; Glass thickness 1.6± 0.15mm
5>Inner tube diameter and glass thickness: Ø 47± 0.7mm; Glass thickness 1.6± 0.15mm
6>Absorptive coating property:
*Structure: Cu/SS-ALN(H)/SS-ALN(L)/ALN
*Sediment method: Three targets magnetron sputtering plating
*Specific absorption: 0.93-0.96(AM1.5)
*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/(M 2.0 C)
*Resistant Hail≤ 25mm
*Useful life15 years
3. QAL solar water heater/heating/collector tank details:
1>Our solar water heater/heating/collector tank size:
Out tank diameter: 460mm, 470mm, 500mm or customized
Inner tank diameter: 360MM, 370mm, 400mm or customized
2>Material of QAL solar water heater/heating/collector:
Out tank: Stainless steel: SUS201, 304
Inner tank: Stainless steel SUS304-2B
3>Tank insulatiing layer of QAL Solar water heater/heating/collector: 50mm-60mm wtih high density or customized.
4>Welding of QAL Solar water heater/heating/collector: Argon arc welding
5>Our solar water heater/heating/collector tank structure: Inlet, outlet(at both oppsote sides), drain(at bottom) & air vent(at top) connections3/4 inch BSP diameter& protective TIG welded with inner tank.
4. QAL solar water heater/heating/collector bracket:
1>Our solar water heater/heating/collector bracket material: Stainless steel, pre-coated galvanized steel, AL-alloy or stainless steel, optional
2>QAL solar water heater's/heating/collector bracket angle: 22, 38, 45 optional, pitched roof, flat roof optional
3>fastening pieces of our solar water heater/heating/collector: Stainless steel nut bolt.
4>QAL solar water heater's/heating/collector tube end support: Tube end support embossed in support structure
| Description | Solar Water Heater |
| Material of out tank | 0.4mm thickness color steel |
| Material of inner tank | Food grade 0.4mm thickness SUS304 stainless steel |
| Tank insulating layer | 55mm 45kg/m³ high-density polyurethane foamed |
| Inlet and outlet hole | Male G 1/2, 3/4 |
| Max pressure | 0.05 Mpa |
| Solar collector tube | 3.3 Borosilicate glass with N/Al coating |
| Thickness of glass tube | 1.6mm |
| Vacuum tube tightness | P≤0.005 Pa |
| Absorption | as=0.93-0.96 (AM1.5) |
| Emission ratio | εh=0.04-0.06 (80C±5C) |
| Idle sunning property parameters | Y=220~260m2.C/KW |
| Average heat loss coefficient | ULT=0.6~0.7W/(m2.C) |
| Bracket: | 2.0mm thickness aluminum alloy |
| Structure of tank | 5 holes for air vent,overflow,water inlet and outlet,electric heater |
| Welding: | Argon arc welding |
| Fastening pieces: | Made of stainless steel screw |
| Absorber area | 2.801m² |
| Tube quantity | 24tube 58x1,800mm |
| Tank capacity | 240L |
From its early beginnings in 2000 Redao (originally called Alinsidun Technologies) is a designer and manufaturer of solar water heating prodcts in China. All of our products are designed to ensure robust performance over a long lifespan. All Redao products are complied with CE, ISO9001-2008.
With our dedicated and experienced team, our specialised manufacturing base, as well as the continued focus on technical solutions and customer service, we are sure that Redao will remain the supplier of choice for many throughout the coming years.
Redao strives to maximize production outputs and quality using the very lastest in manufacturing techniques, and uses equipment with proven reliability and the flexibility to adapt to fast changing requirements of customers. If you are interested in Redao water heater system, please feel free to call us.
Redao brief profile:
2000>Alinsidun establish, the former name of Redao. Production of solar water heater tank begins.
2001>Alinsidun develop its first solar water heater. Rush production begins.
2002>Alinsidun opened sales and distribution office in Shanghai, China.
2003>Alinsidun was awarded "Observing contract & Valuing Credit Star factory" by Zhejiang Quality Examinations and Appraisal Center.
2004>Export production begins.
2005>Alinsidun observed Good Quality control system by Chinese Product Quality Management center. At the same time, Alinston became the mumber of China Solar water Quality Control System.
2006>Alinsidun was awarded "China Solar Water Heater Most Famous Brand" by China Product Quality Management Center.
2007>Alinsitun complied with the Quality Assurance Requirements of ISO 9001-2000
2011>Redao became the company name instead of Alinston, and Redao solar water heaters complied with CE certification. In Aprial, Redao complied with ISO 9001-2008.
2012>QAL mark registered.
