Heatwave 12 Litre Heating Expansion Vessel Hwb-12Lx

Easy to install. 12 Litre Air chamber sealed with a brass air valve.

The Heatwave 12 Litre Heating Expansion Vessel (Model HWB-12LX) is a premium hydronic expansion vessel designed to maintain stable water pressure in sealed central heating systems. Manufactured to the same high standards as all Global Water Solutions (GWS) products, this vessel provides long-lasting reliability, corrosion resistance, and superior pressure control for domestic and light commercial heating applications.

The HWB-12LX model features an integrated hex nut connection for easy installation and secure fitting to system pipework or wall-mounted brackets. Its brass air valve and O-ring sealed air cap ensure a long service life with zero air leakage, while the two-part polyurethane, epoxy-primed finish protects against corrosion in all environments.

Key Features

• Genuine HeatWave expansion vessel – Model HWB-12LX

• 12-litre capacity for sealed heating systems

• Designed to absorb thermal expansion and stabilise pressure

• Equipped with a hex nut connection system for simple installation

• Brass air valve with O-ring seal for leak-free reliability

• Epoxy-primed polyurethane coating for corrosion resistance

• Can be wall-mounted or pipe-supported

• Tested for structural integrity and pressure performance

• Maintenance-free, long-life design

Compatibility

• Suitable for sealed central heating systems in domestic and small commercial setups

• Compatible with oil, gas, and electric boilers

• Can be used as a primary or auxiliary expansion vessel

When to Replace

• If system pressure fluctuates or drops repeatedly

• When the existing vessel fails to maintain charge

• During system upgrades or boiler servicing

Technical Specifications

• Manufacturer: HeatWave (GWS)

• Model: HWB-12LX

• Type: Heating expansion vessel

• Capacity: 12 litres

• Connection Size: ¾" BSP (typical)

• Maximum Pressure: 10 bar

• Pre-Charge Pressure: 1.5 bar

• Material: Steel body with EPDM membrane

• Coating: Two-part polyurethane, epoxy-primed

• Temperature Range: -10°C to +120°C

• Mounting: Wall bracket or pipe support

• Application: Sealed central heating and hydronic systems

HeatWave tanks are the quality solution for hydronic expansion. HeatWave tanks are built to the same stringent standards as all GWS tanks. With an incorporated hex nut system connection,

HeatWave tanks are easy to install. Its air chamber sealed with a brass air valve and o-ring sealed air cap will provide many years of leak free and service free life. Its two part polyurethane, epoxy primed paint finish will withstand the harshest indoor and outdoor climates throughout the world.

HeatWave tanks are quality tested at several stages on the production line to insure the structural integrity of every tank. The HeatWave expansion tank is designed to be either supported by the system piping or the wall mounting bracket.