The WaterBoost WB-Coffin 500 Mini3 Cat 5 (Type AB Air Gap) is a complete variable-speed water boosting system that combines low-profile coffin storage with the highest level of backflow protection in common use. The Type AB air gap cistern protects the mains against fluids up to and including Fluid Category 5, making it suitable for commercial, healthcare, laboratory, agricultural and industrial premises where ordinary domestic protection is not enough.
The system pairs a 500-litre WRAS-approved Category 5 AB air gap coffin tank with the DAB Esybox Mini3 variable-speed pump, delivering 50 l/min at 3 bar and a maximum delivery pressure of 5.5 bar. The pump’s intelligent inverter adjusts continuously to match demand — constant pressure to multiple outlets, lower energy use than fixed-speed alternatives.
The mains discharges above an unobstructed air gap into a cistern with a weir overflow sized for the full inlet flow — a permanent physical break between mains and stored water. Supplied with the float valve, weir overflow, ½" connection and 1" brass outlet. All interconnecting 1" braided hose included as standard.
Fluid Category 5 Type AB air gap WiFi · Google · Alexa WRAS tank & pump Low-profile coffin Weir overflow Pipework included 45 dB(A) 5.5 bar max
