Vertical Expansion Vessel
Vertical (floor-standing) expansion vessels for booster pump and heating systems: 24 litres and above, 10 bar pressure class, space-saving models.
Products (4)
- Forza FRZ-DGT24 Vertical Expansion Vessel, 24 L, 10 Bar – $46.00
- Kentaş 24 L Vertical Expansion Vessel, 10 Bar – Request a quote
- Nortek 50 L Vertical Pressure Tank and Expansion Vessel, 10 Bar – $99.60
- TD 50 Vertical Pressure Tank, 50 L, 1'' Connection – $54.25
Brands: Forza · Kentaş · Nortek
Where is a vertical expansion vessel used?
Vertical expansion vessels are pressurised tanks that take up little floor space thanks to their upright body and legs. They are used in boiler rooms, pump rooms, and utility spaces, positioned against walls. Small-capacity models can be wall-mounted, while tanks of 50 litres and above are typically floor-standing with legs. They can serve both as pressurised water storage in booster pump systems and as expansion volume in closed heating circuits.
Selection criteria
- Capacity: Determined by the pump flow rate for booster pump applications, and by the system water volume for heating applications.
- Pressure class: 10 bar class tanks are suitable for most residential and commercial installations; the maximum system pressure must remain below this value.
- Connection diameter: A 1 inch connection is common on booster pump tanks of 24 litres and above.
- Application: Choose a membrane-lined tank approved for potable water for drinking water applications, and a temperature-resistant membrane tank for heating applications.
- Membrane type: Tanks with a replaceable membrane offer a maintenance advantage.
Installation recommendations
The tank should be connected as close as possible to the pump discharge line, with a ball valve fitted between the tank and the line so the tank can be removed without draining the system. Floor-standing tanks must be placed on a flat, solid surface without any load being applied to the connecting pipe. The valve stem used to adjust the tank air pressure should remain on an easily accessible side. In heating systems, the tank is typically connected to the boiler return line. Remember to leave sufficient clearance around the tank for future valve stem checks and removal work.
Frequently asked questions
Should I choose a vertical or horizontal tank?
They perform the same function technically. Available space is the deciding factor: if floor area is limited, choose vertical; for packaged installations where the pump sits on top of the tank, a horizontal tank is preferred.
Will a 24-litre tank be sufficient?
It is usually sufficient for small booster pumps used in a single apartment or detached house. Larger systems require a greater capacity to prevent the pump from cycling too frequently.
Does the air inside the tank decrease over time?
Yes, the air pressure in diaphragm tanks can drop slightly over time. For this reason, check the pressure at regular intervals and top it up with a pump or compressor if necessary.
Can a vertical tank be wall-mounted?
Some small-capacity models can be used with a wall bracket. Large, floor-standing tanks must always be placed on the floor due to their weight.