Description
Gallons: 3.2
Diameter: 10.6
Height: 11.8
System Connection: 0.75
Wilo Expansion Tanks – Fixed Diaphragm (NON-ASME)
The Wilo Fixed Diaphragm Expansion Tank is designed to maintain system pressure stability and absorb thermal expansion in closed-loop hydronic heating and cooling systems. These NON-ASME rated tanks use a heavy-duty fixed diaphragm that separates the system fluid from the air charge, ensuring long-term reliability and consistent system performance.
Constructed with a robust steel shell and factory pre-charged air chamber, Wilo expansion tanks help prevent pressure fluctuations, reduce water hammer, and protect pumps, valves, and other hydronic components. Their vertical design allows for space-saving installation in mechanical rooms and commercial HVAC applications.
Key Features
- Tank Type: Fixed diaphragm (non-bladder) expansion tank
- Certification: NON-ASME rated
- Applications: Closed-loop hydronic heating, chilled water systems, and general HVAC circulation
- Construction: Heavy steel tank body with factory pre-charged air chamber
- Orientation: Vertical mounted design
- Connection: Threaded system connection sized from 3/4" to 1" depending on model
- Capacity Range: 2.1 gallons to 79.4 gallons
Product Overview
The Wilo Fixed Diaphragm Tank lineup includes models N-15 through N-160V, providing a wide range of system capacities to support small, medium, and large hydronic systems. Each model varies in physical dimensions such as diameter, height, and weight, allowing system designers to choose the optimal tank size for static pressure control and thermal expansion requirements.
These tanks are engineered to reduce system pressure swings during temperature changes, preventing nuisance relief valve discharge and extending equipment life. Their compact footprint and durable construction make them suitable for commercial buildings, light industrial facilities, and retrofit applications.
Applications
- Hydronic heating systems
- Chilled water loops
- Commercial HVAC systems
- Boiler systems and closed-loop circulation
- Pressure stabilization in thermal expansion systems
Note: Model dimensions, system connection sizes, weights, article numbers, and list pricing are based on manufacturer information displayed in the provided image.