WaterBoost ATX-300 4.5 Bar Whole House Pressure Booster

The WaterBoost ATX-300 4.5 is the high-pressure version of the ATX-300 integrated accumulator booster. It connects directly to the incoming cold water mains, combining a 300-litre sealed accumulator vessel with the WB-Compact 4.5 variable speed pump in a single compact unit — charging the vessel up to 4.5 bar and boosting both pressure and flow throughout the property the moment a tap or shower is opened. No break tank, no overflow arrangement, just two water connections required.

The system delivers a peak burst flow of up to 80 l/min and up to 27 l/min at up to 4.5 bar for up to 11 minutes — before settling to a continuous boosted flow of 12 l/min at 3.0 bar until the vessel recharges. The 300-litre vessel provides 180 litres of useable working capacity. Variable speed inverter technology means the pump only generates the pressure your mains can’t already deliver, keeping running costs to a genuine minimum. Operation is measured at a quiet 40 dB(A). WiFi via the DAB H2D app enables remote monitoring and control, with a Power Shower mode for when you want everything the system has. A mains bypass fits in seconds using 2 clips if the unit ever requires attention.

WRAS approved product — continuous flow stays within the water authority limit of 12 l/min. Fully sealed system — zero air contact with stored water, no hygiene management required. Completely maintenance free. Suited to 2-4 bed homes upwards with two or more showers running together, rain heads, body jets, top-floor bathrooms or an unvented cylinder that wants more than 3 bar can give. 5-year tank warranty, 3-year pump warranty. If 3.2 bar is enough, see the standard ATX-300; step down to the ATX-250 4.5 for two bathrooms.