Expansion Vessel
Horizontal, vertical, spherical, and non-burst expansion vessels for booster pump and central heating systems; 8–10 bar pressure class and replacement membrane options.
Subcategories
Products (29)
- 24 L Horizontal Expansion Vessel, 1 inch Connection – $38.11
- 24 L Spherical Pressure Tank Kit, Booster Pump Connection Set – $47.24
- 2 L Hot Water Booster Pump Expansion Vessel, 95 ℃, Burst-Proof – $11.40
- Element Flexible Hose with Elbow, 100 cm, 10 bar, 1″ – $16.91
- Forza FRZ-DGT24 Vertical Expansion Vessel, 24 L, 10 Bar – $46.00
- Forza FRZ-TGPYK Automatic Booster Pump Spare Ball (TGP 125 Compatible) – $12.00
- Forza FRZ-YGT24 Horizontal Expansion Vessel, 24 L, 10 Bar – $56.00
- Hidrotank Globe Booster Pump Kit with Connection Set, 24 L – $106.98
- Hidrotank TA24 Spherical Pressure Tank, 24 L, 1", 8 Bar – $55.47
- Hidrotank TD 50 Vertical Pressure Tank, 50 L, 1″ Connection – $96.15
- Hidrotank TY 24 Stainless Steel Horizontal Expansion Vessel, 24 L, 1'' Connection – $150.00
- Horizontal Expansion Vessel, 24 L, 1″ Connection – $68.68
- Hot Water Expansion Vessel, 2 L, 90°C, Non-Burst – $10.37
- İKRAHİDRO-11H 1 Floor 1 Apartment Booster Pump with Pressure Switch – $106.98
- Kentaş 24 L Horizontal Expansion Vessel, 10 Bar – Request a quote
- Kentaş 24 L Vertical Expansion Vessel, 10 Bar – Request a quote
- Nema NEQ 50 L Horizontal Expansion Vessel, 10 Bar – Request a quote (out of stock)
- Nortek 24 L Spherical Pressure Tank and Expansion Vessel, 10 Bar – $54.00
- Pedrollo JCRm 2A Stainless Steel Jet Booster Pump with Pressure Controller, 5 Floors, 10 Apartments – $772.63
- Sumak SMJ 85 Booster Pump with Hydromat, 4 Floors, 4 Apartments – $237.81
- Sumak SMKT 300 Two-Stage Centrifugal Pump, Three-Phase, 3 HP, 380 V – $732.24
- Sumak SMT 300/2 Centrifugal Pump, Three-Phase, 3 HP, 380V – $515.14
- Sumak SYMH 6-100/6 Horizontal Multistage Building Booster Pump, 100 L Tank, 6 Floors, 13 Apartments, 1 Hp, 220V – $735.65
- TA24 Spherical Pressure Tank, 24 L, 1'' Connection, 8 Bar – $31.91
Brands: Uzman · Element · Forza · Hidrotank · Kentaş · Nema · Nortek · Pedrollo · Sumak
What is an expansion vessel?
An expansion vessel is a sealed tank containing a flexible membrane and pressurized air. It serves two primary functions in water systems. In booster pump systems, it stores pressurized water to prevent the pump from running with every small demand; in heating systems, it accommodates the volume increase caused by water expanding when heated, preventing system pressure from reaching dangerous levels. It is also used for the same purpose in solar energy and hot water systems.
Types of expansion vessels
- Horizontal expansion vessels: 24–50 liter tanks that can be mounted on top of the pump in twin-pump booster sets.
- Vertical expansion vessels: Models with a floor-standing leg structure that saves space, available in a range of capacities from small to large.
- Spherical tanks: Compact solutions for small booster pumps and combi boiler systems.
- Non-burst expansion vessels: Tanks with the membrane fixed to the casing, featuring a different internal construction.
Selection criteria
Tank capacity is determined in booster pump systems by the pump's flow rate and the permitted number of starts per hour, and in heating systems by the total water volume in the system and the operating temperature. The tank's pressure rating (e.g., 8 or 10 bar) must exceed the system's maximum operating pressure. Heating system tanks are generally produced in red, while drinking and domestic water tanks are blue or white; even so, select by the intended use stated on the label, not by color. The connection size (such as 1/2, 3/4, or 1 inch) must be compatible with the existing system.
Maintenance
The tank's air pressure is checked via the Schrader valve on the tank when the water side is depressurized (pump off and faucet open). In booster pump tanks this value is set slightly below the pump cut-in pressure; in heating tanks it is set according to the system's static pressure. Water coming from the Schrader valve indicates a ruptured membrane; a replacement membrane can be fitted, or the tank can be replaced.
Frequently asked questions
Is a pressure tank and a central heating expansion vessel the same thing?
Although their construction is similar, the membranes used and operating conditions differ. Drinking water tanks use a membrane rated for contact with water, while heating tanks use a membrane rated for high temperatures.
How often should the tank pressure be checked?
It is recommended to check at least once a year. If the pump starts running more frequently than normal, it is a sign that it is time for a check.
Is it a problem if the tank capacity is too large?
A larger tank causes the pump to run less frequently; however, it increases space requirements and cost. Select based on the recommended system capacity in the product descriptions.