SP-100 is a 100-liter (28 gallon) expansion vessel designed for closed-loop solar hot water systems. It effectively manages temperature fluctuations to maintain safe pressure levels and protect the system from excessive variations.
Built for extreme environments, the tank supports up to 10 bar (150 psi) and 130°C (266°F). It is factory pre-charged to 3.5 bar (50 psi) with 100% nitrogen gas to ensure stable performance and prevent thermal pressure spikes.
With a 43.2 cm diameter and a height of 76.3 cm, the SP-100 is ideal for robust commercial solar setups and large-scale residential installations. It specifically supports thermal liquid expansion for massive 140-gallon water heaters, providing a reliable and high-capacity solution.
Product Overview
The SP-100 is a 100-liter (28 gallon) diaphragm expansion tank designed for high-capacity solar thermal networks. It masterfully absorbs the large-scale volumetric expansion of water-glycol mixtures, preventing over-pressure during stagnant peak solar gain and ensuring the system remains pressurized during extreme cold conditions.
The tank features a heavy-duty cold-rolled steel shell with a professional Red (RAL 3011) epoxy powder finish for maximum durability. Inside, a high-temperature resistant liner and a premium EPDM diaphragm (DIN 4807) are specifically engineered to withstand the intense thermal cycles and chemical aggressiveness of high-volume solar loops.
Equipped with a 1" 304 stainless steel connector, the CE and ISO 9001 certified SP-100 provides a lead-free and perfectly secure interface. This high-capacity vessel is the ultimate solution for large residential complexes or industrial solar plants, ensuring long-term safety, structural integrity, and maximum system efficiency.
Certification
Specifications and Technical Data
| Parameter | Value |
| Model Number | SP-100 |
| Total Tank Volume | 100 liters / 8 gallons |
| Diameter | 43.2 cm / 17.0 inch |
| Height | 76.3 cm / 30.0 inch |
| Net Weight (NW) | 13.7 kg / 30.2 lbs. |
| Gross Weight (GW) | 15.2 kg / 34.4 lbs. |
| Shipping Volume | 5.72 CUF |
| Operating Temperature | 1 - 130°C / 34 - 266°F |
| Factory Pre-charge | 3.5 bar | 50 psi |
| Max. Operating Pressure | 10 bar | 150 psi |
| Connection | 1” NPT / BSPT Stainless Steel |
| Liner Material | Polypropylene |
| Diaphragm Material | EPDM Rubber |
| Shell | Cold Rolled Carbon Steel |
| External Coating | Triple Grade Blue Paint |
| Pre-charge Gas | 100% Nitrogen |
Key Features & Design Advantages
How the Solar-Plus Pressure Tank Works
In closed-loop solar systems, the heat transfer fluid (often a water/glycol mix) expands significantly as it absorbs intense heat from solar collectors. The SP-100 manages this by storing the expanded fluid against the high-temperature EPDM rubber diaphragm, pushing against the nitrogen-filled air cushion. This safely relieves pressure. When the system cools—such as at night or in freezing temperatures—the nitrogen cushion forces the fluid back into the pipes, preventing the pressure from dropping dangerously low.
Key benefits
Typical Applications
Frequently Asked Question (FAQ)
A: Built to handle substantial fluid weight, the SP-100 is a floor-standing tank with an integrated base that measures 17.0 inches (43.2 cm) in diameter and 30.0 inches (76.3 cm) in height. It safely connects to your solar system using a highly durable, completely lead-free 1-inch 304 Stainless Steel connector.
A: To guarantee long-term system stability, the SP-100 utilizes a high-temperature EPDM rubber diaphragm and is factory pre-charged with 50 PSI (3.5 Bar) of 100% Nitrogen gas. Because Nitrogen is highly stable, it prevents the tank's pre-charge pressure from dropping or fluctuating when exposed to extreme environmental temperature changes.
A : The SP-100 requires a shipping volume of 5.72 CUF.
Customized Colors & Packaging
We offer a wide range of customization options to match your exact needs - from custom colors to branded packaging and logo design.
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Downloads & Certification Links