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Help Center304 Stainless Steel Solar Hot Water Storage Tank With 50mm Polyurethane Foam Insulation, 300L
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Welcome to Anping County Boli Hardware Wiremesh Products Factory, a trusted manufacturer since 1998 with an annual export value of US$5–10 million. Our 300L 304 stainless steel solar hot water storage tank is designed to maximize energy efficiency and durability for residential and commercial solar thermal systems. With 50mm thick polyurethane foam insulation, this tank minimizes heat loss, ensuring hot water stays hot longer. As a factory-direct supplier, we offer competitive pricing, customizable options, and reliable quality that our global customers in North America, Europe, Oceania, and beyond have relied on for decades.
This storage tank is built from high-grade 304 stainless steel – a material known for its excellent corrosion resistance, long service life, and food-grade safety. The inner tank is electro-polished and passivated, preventing rust and scaling even in hard water areas. The outer shell is also made of stainless steel or optional painted steel, providing a sleek appearance and extra protection. The 50mm polyurethane foam (PU) insulation layer is CFC-free and has a closed-cell structure, delivering outstanding thermal retention with a heat loss coefficient of less than 1.5°C per hour (under standard test conditions).
Key Features & Technical Specifications:
- High-grade 304 Stainless Steel Inner Tank – 1.5mm thickness, welded with argon arc welding for leak-proof performance.
- 50mm Polyurethane Foam Insulation – High-density, non-toxic, weather-resistant; maintains water temperature for 72+ hours in moderate climates.
- 300L Large Capacity – Suitable for 4–6 person households or small commercial applications, compatible with most solar collectors.
- Multiple Connection Ports – 1 inlet, 1 outlet, 1 auxiliary heating element port (for electric backup), 1 temperature sensor port, and 1 pressure relief valve port.
- Optional Sacrificial Anode – Magnesium anode rod available to extend tank life in aggressive water conditions.
- Working Pressure – Up to 0.6 MPa (standard), higher pressure ratings available upon request.
- Easy Installation – Pre-insulated with mounting brackets, designed for vertical or horizontal placement (depending on model).
- Customizable Exterior – Choose from stainless steel, painted steel, or color-coated sheet; also available in various sizes (150L–500L).
Detailed Technical Parameters:
| Parameter | Value |
| Inner Tank Material | 304 Stainless Steel (SUS304) |
| Inner Tank Thickness | 1.5mm (customizable) |
| Outer Shell Material | 304 Stainless Steel / Painted Steel |
| Insulation Layer | 50mm Polyurethane Foam (density 40–45 kg/m³) |
| Capacity | 300 Liters |
| Maximum Working Pressure | 0.6 MPa (6 bar) |
| Maximum Temperature | 95°C |
| Connection Ports | G 3/4" or G 1" (customer order) |
| Weight (empty) | Approx. 45 kg (depending on shell) |
| Warranty | 5 years for inner tank, 2 years for accessories |
Why Choose Our 300L Solar Tank?
- Superior Insulation – The 50mm polyurethane foam reduces standby heat loss, allowing your solar system to achieve higher efficiency and lower backup energy use.
- Durable & Hygienic – 304 stainless steel inner tank is resistant to corrosion and bacteria growth, ensuring clean hot water for bathing and cooking.
- Customizable – We offer multiple inlet/outlet positions, an extra electric heating element flange, and color options to match your project requirements.
- Factory-Direct – As a manufacturer, we eliminate middlemen, delivering cost-effective solutions without compromising quality.
- Global Shipping – We ship from Tianjin, Qingdao, Shanghai, Foshan, and other major ports, with experience exporting to North America, South America, Europe, Africa, Oceania, and more.
Trust & Reliability
Anping County Boli Hardware Wiremesh Products Factory has been serving international buyers since 1998, with annual exports exceeding US$5 million. Our manufacturing facility in Hengshui, Hebei, China, is equipped with modern stamping, welding, and insulation production lines. Each tank undergoes rigorous pressure testing, insulation performance testing, and visual inspection before shipment. We have a dedicated quality control team that ensures every unit meets your specifications. Our customers include distributors, solar installers, and engineering contractors across 30+ countries. We are committed to providing responsive after-sales support and technical guidance. Contact us today to discuss your bulk order or customized tank requirements.
Frequently Asked Questions (FAQ)
Yes, our 304 stainless steel is food-grade and suitable for potable water storage. It complies with international standards for drinking water.
Absolutely. The tank comes with a dedicated port (usually 1.5" or 2" BSP) for installing a standard electric heating element. We can also supply the element as an optional accessory.
With 50mm polyurethane foam, the temperature drop is typically less than 5°C in 24 hours under ambient conditions of 20°C. Actual performance depends on climate and installation.
Yes, we produce a range of capacities from 100L to 500L. We also offer custom sizes based on your drawings or specifications.
We offer a 5-year warranty on the inner tank against corrosion and leakage, and a 2-year warranty on other components (outer shell, insulation, fittings).
Yes, this tank is compatible with solar collectors, heat pumps, gas boilers, and electric backup systems. The multiple ports allow flexible integration.
Yes, our polyurethane foam is CFC-free and has a low GWP (Global Warming Potential). It is safe for indoor installation.
Each tank is individually wrapped with protective foam and packed in a sturdy plywood case or carton, with steel strapping for extra security. Custom packaging is available.
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