DAB Esybox Max Commercial Variable Speed Booster Pump

All-in-one pumping system for water pressurisation in commercial buildings. Configurable as single, double, triple or quadruple units for medium to large condominiums and buildings up to 14 floors. Each unit mounts to an Esydock Max docking station. Variable frequency drive with a water-cooled permanent magnet motor, Wi-Fi module, and H2D app control.

Esybox Max is modular: one pump, two on a twin dock, three on a triple dock, four by joining two twin docks. The pumps pair wirelessly into one group with no external control panel. The group starts one pump, stages the next in only when demand needs it, rotates the starting order to share wear, and can hold one or more in reserve. Docks: ESYDOCK MAX (60199045) single, 2 ESYDOCK MAX (60199055) twin, 3 ESYDOCK MAX (60199056) triple. A four-pump set uses two twin docks and a connecting kit.

More pumps hold more pressure at the same flow. Each one carries a share of the water, so each sits higher on its own curve. DAB publishes the proof: on a 60/120 delivering 63 GPM, one pump adds 30 psi, two add 87 and three add 98 — the same water, at more than three times the pressure. Read the tables the other way and the flow rises instead: 39.6 GPM from one pump at 71 psi becomes 79.3 from two and 118.9 from three. A group buys more water, more pressure, or any mix of the two. The one figure that does not rise is the shut-off ceiling at zero flow, set by the model at 83, 97 or 136 psi.

How to Connect Multiple DAB Boosters

The figures below are the pressure this pump adds. That is what a pump curve measures — the impeller does not know what pressure is already on its inlet.

Models

Pressure added in PSI, by flow

Converted from the head DAB prints in feet in its Esybox Max technical sheet 50250413 (PSI = ft ÷ 2.31), at the flows DAB tabulates for every model. The full table, including 10.6, 15.9, 21.1, 26.4, 39.6 and 47.6 GPM, is in the Technical Leaflet on the Data Sheet tab. Bold = the last point on that model’s curve, its max flow; — = beyond it.

Drawing from a tank, cistern or well — nothing arrives with pressure, so what the pump adds is what you get. Read the table straight through: a 60/120 set to 70 psi delivers about 40 GPM.

Fed by a city main — the pump adds on top of what already arrives, up to 83, 97 or 136 psi depending on model, and the controller holds a set point of up to 174 psi in total. A 60/120 on a 40 psi main set to 70 psi only has to add 30 — and at 30 psi of added pressure its table gives roughly 63 GPM instead of the 40 GPM a tank would. Incoming pressure turns into extra flow at the same set point.

Best operating range: 45/120: 19 to 33 GPM · 60/120: 24 to 40 GPM · 85/120: 24 to 40 GPM. This is where the pump turns the most electricity into water pressure. Ask for more flow than it can deliver at your setting and it runs at full speed continuously, which is where motors and seals wear out. Sizing a booster to the building rather than to the headline numbers is what makes it last.

Zero flow is the shut-off point — a ceiling, not a working point. Published maximum flow is 76.6 GPM per pump (63.4 GPM on the 45/120). These figures are at full speed; the drive holds lower pressures by running the pump slower. Feet of head = PSI × 2.31. Best operating range is derived from the published duty points — DAB does not publish an efficiency curve for this model. DAB’s two- and three-pump tables carry the same heads at two and three times the flow. Source: DAB Esybox Max US Technical Sheet 50250413, 2026.

Parts in contact with the liquid, per the manufacturer technical sheet.

This pump connects to H2D, DAB’s official app, which replaces DConnect.

• Free: guided setup, live status and basic parameters, error overview and alarm alerts.
• Free: share an installation with up to 2 users (10 with Premium).
• Premium subscription: change settings and manage the pump from anywhere, full alarm and usage history, data-log analysis and PDF reports.
• H2D Desktop opens the same installations on a tablet or computer.