WaterBoost WB – Advant 400 slim Esybox 2604B110SL

The WaterBoost WB-Advant Slim 400 Esybox is the narrowest tank in the entire WaterBoost range paired with the higher-flow DAB Esybox pump — delivering serious performance in installations with severely restricted access. A 400-litre WRAS-approved UK-manufactured Advant slimline tank (400mm W × 1050mm L × 1253mm H) pairs with the DAB Esybox external variable speed pump, delivering 80 l/min at 3 bar and up to 6.5 bar maximum — with WiFi, DConnect app, H2D technology, Google Home and Alexa voice control.

At just 400mm wide, the vertical slimline tank passes through a standard doorway with a generous 362mm to spare — opening up loft hatches, tight cellars and utility spaces that no other tank can reach. The Esybox sits alongside the tank for full pump accessibility, running at an exceptionally quiet 43 dB(A). The tank connects directly to the mains via the pre-fitted ¾″ ball float valve, with 1.5″ outlet. All interconnecting pipework is supplied — no site assembly required.

The UK-manufactured tank carries an outstanding 10-year warranty and the DAB Esybox a 3-year warranty. Delivery is typically 1–2 working days.