Large Capacity Solar Water Tank
Manufacturing & Supply
- Home
- Large Capacity Solar Water Tank
Large Capacity Solar Water Tank
Millionsun specializes in OEM and ODM manufacturing of large capacity solar water tanks for distributors, solar brands, EPC contractors, and project developers worldwide.
Tanks range from 1000L to 5000L and beyond, and can be used with solar collector arrays, heat pump systems, boiler backup, or electric heating elements.
Key Features & Performance
Pressurized tanks
for closed-loop solar systems, mains pressure & multi-story buildings.
Non-pressurized tanks
for open-vented, gravity-fed systems and cost-effective commercial projects.
Large Stainless-Steel Inner Tank
SUS304/316L stainless steel liner for commercial hot-water storage. Corrosion resistant under diverse water quality conditions.
Polyurethane Foam Insulation
100 mm one-shot foamed polyurethane insulation, reduces heat loss for large capacity tanks and retains water temperature longer.
Flexible Heating Options
Optional electric heating elements, internal heat exchanger coils for solar/boiler input, or storage-only tanks without built-in heating.
Commercial-Grade Build
Reinforced tank structure for long commercial service life. Painted steel outer shell with protective coating, suitable for indoor & outdoor installation.
Custom Connection Layouts
Inlet & outlet ports configurable to project specifications. Top, side and bottom connection options available.
Large Capacity Water Tank Specifications
| Model | Dimensions | Description |
|---|---|---|
|
1000 L Pressure Tank |
Φ1000 × 2170 mm | Outer material: Stainless steel 304 or paint steel (thickness: 0.8mm) Inner material: SUS304 or SUS316L (thickness: 2.0mm) Insulation: Polyurethane (thickness: 100mm) Electrical heater: Optional according to requirements Work pressure: 0.7MPa |
|
2000 L Pressure Tank |
Φ1200 × 2700 mm | Outer material: Stainless steel 304 or paint steel (thickness: 1.0mm) Inner material: SUS304 or SUS316L (thickness: 2.5mm) Insulation: Polyurethane (thickness: 100mm) Electrical heater: Optional according to requirements Work pressure: 0.7MPa |
|
3000 L Pressure Tank |
Φ1400 × 2800 mm | Outer material: Stainless steel 304 or paint steel (thickness: 1.0mm) Inner material: SUS304 or SUS316L (thickness: 2.5mm) Insulation: Polyurethane (thickness: 100mm) Electrical heater: Optional according to requirements Work pressure: 0.7MPa |
|
5000 L Pressure Tank |
Φ1700 × 3000 mm | Outer material: Stainless steel 304 or paint steel (thickness: 1.0mm) Inner material: SUS304 or SUS316L (thickness: 3.0mm) Insulation: Polyurethane (thickness: 100mm) Electrical heater: Optional according to requirements Work pressure: 0.7MPa |
There are two configurations to match different system designs and local regulations
| Configuration | How It Works | Best For |
|---|---|---|
|
Non-Pressurized (Open-Vented) |
Tank is open to the atmosphere. Water flows by gravity or pump. Lower cost, simpler construction. | Budget projects, warm climates, open-loop solar systems |
|
Pressurized (Closed-Loop) |
Tank is sealed. Delivers hot water at full mains pressure (0.6 MPa). Compatible with antifreeze systems. | Multi-story buildings, cold climates, closed-loop solar systems |
What we offer?
OEM & ODM Manufacturing Support
Private Label Production
Pressurized (0.7 MPa) & Non-Pressurized Options
Stainless Steel SUS304/316L Inner Tank
Capacities from 1000L to 5000L+
Electric Heating Element Options
Custom Inlet/Outlet Positions
Custom Project Solutions
Custom capacities, dimensions, connection configurations, and heating options available for OEM customers and large-scale commercial projects.
Business Value
How the System Works
Solar Thermal System (Non-Pressurized)
Solar collectors heat water, which circulates to an open-vented storage tank by thermosyphon or pump. Hot water is supplied from the top, while cold water enters from the bottom.
Solar Thermal System (Pressurized)
Solar collectors heat antifreeze fluid in a closed loop. A heat exchanger transfers the heat to water in the pressurized tank, delivering hot water at full mains pressure.
Electric or Boiler Backup
Electric heating elements or boiler coils provide backup heating when solar energy is insufficient, ensuring a continuous hot water supply.
Commercial Hot Water Systems
Multiple tanks can be connected in series or parallel to increase storage capacity and meet high-demand commercial applications.
Manufacturing & Supply Capabilities
OEM Manufacturing
Millionsun has a dedicated tank workshop producing large capacity tanks for commercial solar and hot water projects worldwide.
Our Factory
- 8,000 m² Production Facility
- 80+ Employees
- 6 Automated Production Lines
- Dedicated tank production workshop
- Tank production since 2010
- Tank output: 4,000 units per month
Supply Options
- Standalone tanks (pressurized or non-pressurized)
- Tanks with or without electric heating elements
- Tanks with or without copper heat exchangers
- Custom connection positions
- Private label / custom branding
Technical Resources Center
Frequently Asked Questions
Do you offer OEM service?
Yes. We make tanks for your brand. Tank size, pressure rating, connections, and heating options — all customizable.
What capacities are available for large tanks?
Standard sizes: 1000L, 2000L,3000L,5000L. Custom capacities 5000L above available for projects.
What is the difference between pressurized and non-pressurized?
Pressurized tanks operate at 0.7 MPa and deliver mains-pressure hot water. Non-pressurized tanks are open-vented and require a pump for pressure. Choose based on your system design and local building codes.
Can the tank be installed outdoors?
Yes. Outdoor installation is possible with weather protection considerations.
What heating options are available?
Electric heating elements (acc to you requirement for large tanks), copper heat exchanger for solar or boiler input, or storage-only without internal heating.
What support do you provide for commercial projects?
One-stop procurement, product documentation, system design guidance, dimension drawings, and project support from our engineering team.
Request OEM Quotation
Visit Our Factory
Building 14, Baiwang Science and Technology Park, No.40, Chuangxing North Road, Gaobu Town, Dongguan City, Guangdong Province, China