WaterBoost 300 Litre Horizontal Accumulator Vessel AWBH-300LH

The WaterBoost AWBH-300LH is a 300-litre WRAS-approved horizontal accumulator vessel for mains-connected water systems. The horizontal orientation makes it ideal where headroom is limited — fitting neatly in a loft, cupboard, or plant room on its side. Accumulators store mains water under pressure so you draw instantly at full mains pressure the moment you open a tap or shower, delivering noticeably stronger, more consistent flow even during peak demand periods.

The AWBH-300LH operates on a 60% usable volume ratio — delivering approximately 180 litres of high-pressure water before returning to normal mains flow. At a typical shower flow of 12 l/min, 180L supports two simultaneous showers for approximately 7.5 minutes before returning to normal mains flow. Diaphragm design, WRAS-approved construction, maintenance free. The AWBH-300LH is the largest in the horizontal range, suited to 3 bedroom+ homes with higher simultaneous demand.

Requires a minimum 2 bar static mains pressure to operate effectively. If your static pressure is below 2 bar, add the WaterBoost ACF1 accumulator booster pump to charge the vessel to the required working pressure.