The ELBI AC-2 is a compact, coated expansion vessel (pressure tank) designed for small domestic installations, pump sets and boiler systems. This 2-liter diaphragm/bladder tank isolates the water from the air cushion with a replaceable butyl/EPDM-type membrane, helping prevent waterlogging and reducing thermal expansion and water hammer effects in hot and cold water systems. Typical technical characteristics include 2 L capacity, 3/4" inlet connection, a maximum working pressure rated to approximately 8 bar, and a service temperature range up to about +99°C — making it suitable as a sanitary expansion vessel and pressure tank for small flows.

Key features

• Compact 2 L capacity for domestic and garden irrigation circuits.
• Replaceable bladder (butyl/EPDM) to separate air and water for hygienic operation.
• Durable epoxy powder coating for corrosion resistance and long service life.
• 3/4" inlet for standard plumbing compatibility; easy to install and mountable.
• Multi-purpose: thermal expansion absorber, pressure stabilization, and water hammer arrestor.

The AC-2’s powder-coated shell and internal membrane construction make it an economical, low-maintenance choice for installers and homeowners seeking a reliable thermal expansion vessel or small pressure accumulator. Ideal for integration with boilers, water heaters, small pump stations and booster sets, the unit helps protect valves and fittings while improving pump cycling and system stability.