The figures below are the pressure this pump adds from where it sits in the tank or well. Its head has to lift the water to the highest fixture first, then supply the pressure you want there.
Pressure added in PSI, by flow
| Model |
0 GPM (Shut-off) |
12 GPM |
16 GPM |
20 GPM |
24 GPM |
28 GPM |
31 GPM (Max) |
| Esybox Diver X |
77.9 |
77.9 |
74.9 |
56.3 |
35.5 |
16.1 |
0.9 |
Converted from the head DAB prints in feet (PSI = ft ÷ 2.31). DAB also tabulates 4 and 8 GPM; both equal shut-off, because the inverter holds the pressure flat out to 12 GPM. The Diver X uses the same DAB table as the standard Esybox Diver: Kit X changes the intake, not the pump.
Read it this way. Set to 50 psi with the tank at the same level as the house, the Diver X delivers about 21 GPM. Every 10 ft the water has to climb costs 4.3 psi, so the same 50 psi at a fixture 30 ft above the water needs the pump to add 63 — and the table gives roughly 19 GPM there instead. Height comes off the flow you get, not the pressure you set.
Best operating range: 10 to 16 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 pump to the house rather than to the headline numbers is what makes it last.
Zero flow is the shut-off point — a ceiling, not a working point. DAB gives the maximum flow as 31.7 GPM, where the head reaches zero; its table ends at 31 GPM. Any set point from 14 to 80 psi is settable below the curve. These figures are at full speed; the drive holds lower pressures by running 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. Curve tolerance to ISO 9906. Source: DAB Esybox Diver Technical Sheet 60191717, AMREG, 2021.
Output in GPM at 30 and 50 PSI set pressure, by lift from the water level
| Set pressure |
0 ft |
10 ft |
20 ft |
30 ft |
40 ft |
50 ft |
60 ft |
| 30 PSI set |
25 |
24 |
23 |
22.5 |
21.5 |
20.5 |
20 |
| 50 PSI set |
21 |
20 |
19 |
18.5 |
17.5 |
16.5 |
14 |
Calculated from DAB’s head-at-flow table (Esybox Diver Technical Sheet, at full speed); DAB publishes no output table for this pump. Each cell is the flow where DAB’s curve meets the lift from the water level plus the pressure (30 PSI = 69 ft, 50 PSI = 116 ft), interpolated between DAB’s printed points and rounded down to 0.5 GPM. — = beyond DAB’s printed range or under 1 GPM. Pipe friction is not included.
Enter your water level, pipe run and pressure. The calculator shows which DAB pumps cover the duty, with the headroom on each.
