DAB Esytwin Duplex Variable Speed Booster System, Dock, Tank, 92 PSI Max Boost - 64 GPM Max / 2 x 2.1 HP - 230V 1Ph / 2 x 60212311

A complete two-pump pressurisation system for a residence or apartment building that needs more than one E.SYBOX can deliver. The two units associate wirelessly — no external controller, no hardwired master — and stage sequentially: one pump modulates to hold pressure at light demand, the second joins when demand climbs, for up to 64 GPM. Either can lead, and lead priority rotates on runtime so wear is shared. Configure both active for full flow, or one as reserve so the building never loses pressure if a pump faults. The E.SYTWIN dock sets both pumps on one compact manifold, and a 2-gallon tank lengthens runs and reduces cycling.

Shipped as one system. Each E.SYBOX keeps its own inverter, sensors and motor control — the dock is the shared hydraulic base. Maximum four E.SYBOX in a wireless group; for three or four pumps, a common symmetrical manifold is used rather than the two-pump dock.

Because each pump carries a share of the flow, each sits higher on its own curve — so at any working flow, the pair holds more pressure than one pump would at that same flow. Only the shut-off ceiling at zero flow is fixed, unchanged at 92 psi. The performance table below is read at the flow the pair delivers.

Group figures follow DAB’s parallel-pump method: each pump carries half the total flow, so the pair’s curve is the single-pump curve read at half the system flow. DAB publishes no certified combined table for the twin; size against the system curve rather than by doubling a single-pump maximum.

The E.SYTWIN dock supports four inlet/outlet arrangements so the building connections can enter from either side: both left (A), diagonal right-in left-out (B), both right (C), or diagonal left-in right-out (D). Same-level cross-dock combinations are not permitted — each valid arrangement pairs the designated inlet manifold with the designated outlet manifold. Unused ports are capped with the included plugs.

The figures below are the pressure the system adds at each total flow, both E.SYBOX units running. That is what the pump curve measures — the impellers do not know what pressure is already on the inlet.

Pressure added in PSI, both units running, by system flow

Derived from DAB’s single-pump table at twice the flow, pressure unchanged: DAB publishes no combined table for this pair. Converted from the head DAB prints in feet (PSI = ft ÷ 2.31).

Drawing from a tank, cistern or well — nothing arrives with pressure, so what the system adds is what you get. Read straight through: 21 GPM comes out at 81 psi.

Fed by a city main — the system adds on top of what already arrives, and the controllers hold up to 85 psi total. Incoming pressure turns into extra flow at the same set point.

DAB positions the twin for apartment buildings up to about 9 floors and 17 apartments under its average-value selection assumptions. Actual sizing must be analysed for each installation.

Best operating range: about 22 to 38 GPM across the pair, derived from the single Esybox range of 11 to 19 GPM.

Zero flow is the shut-off point — a ceiling, not a working point, and the same figure as one pump because it is fixed by the model. Published maximum system flow is 64 GPM. These figures are at full speed; the drives hold lower pressures by running the pumps slower. Feet of head = PSI × 2.31. Source: DAB E.SYBOX Technical Sheet 60172910-USA.

This is a custom-assembled system and ships without a single manufacturer EAN. Both pumps must run the same firmware version and the same maximum-speed setting. Confirm the duty point against the system curve for your building; for engineering-led sizing, contact us before ordering.

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

Both pumps connect to H2D, DAB’s official app, which replaces DConnect.

• Free: guided setup, live status and basic parameters, error overview and alarm alerts.
• Free: Power Shower, Good Night quiet mode and monthly water-use tracking.
• Premium subscription: change settings and manage the pumps from anywhere, full alarm and usage history, data-log analysis and PDF reports.
• H2D Desktop opens the same installations on a tablet or computer.