DAB · Electronic Circulator
Evosta 2 / 2d
A wet-rotor electronic circulator for home heating and cooling, with nine operating modes on one button; the 2d adds a display that shows the working point.
18 ft Max Head · 15.1 GPM Max Flow
110-127V 1Ph
4-41 W Power Input
Nine Modes, One Button
145 PSI Max Working Pressure
14-230 F Liquid
6-3/8 in Centre Distance, Oval 2-Bolt Flange
IPX5 / NEMA 4X
CSA
6.4 L x 5.4 W x 5.6 H in
Overview
The DAB Evosta 2 is a low-energy electronic circulator for hot water in domestic heating systems, also used for cooling. Its permanent magnet ECM motor and built-in electronics sense what the system needs and adapt the output. It matches the size of older three-speed circulators, covering heads up to 18 ft with one model. The Evosta 2d is the same circulator with a display that shows the real working point.
-
Nine modes on one button: proportional differential pressure, constant differential pressure and fixed curve, three curves each.
-
Drop-in replacement for older three-speed circulators: 6-3/8 in centre distance, oval two-bolt flange.
-
Breather plug to degas the system and free the motor shaft.
-
Cast iron body with cataphoresis treatment; stainless steel motor casing; ceramic shaft.
-
IPX5 (NEMA 4X): protected against water jets.
What Ships and What It Needs to Run
Included: the Evosta circulator (the 2d with its working-point display) and its breather plug.
Pipe connections: oval two-bolt flanges at 6-3/8 in centre distance; flange hardware matched to your piping and ordered separately.
Genuine DAB equipment, factory-new in original packaging — sold and supported by Watermain Supply, an independent industrial supplier. Watermain Supply is an Authorized Stocking DAB Distributor.
24-Month DAB Warranty
Covered for 24 months from the date of purchase under DAB’s published warranty terms, evidenced by the invoice or delivery document.
Specifications
| Operating range |
0.8 to 15.1 GPM; head up to 18 ft |
| Operating modes |
Proportional differential pressure, constant differential pressure, fixed curve; 3 curves each |
| Motor |
Permanent magnet synchronous (ECM) |
| Power input |
4 to 41 W; 0.064 to 0.61 A; EEI 0.23 or better |
| Power supply |
1 x 110-127 V, 60 Hz |
| Working pressure |
145 psi (10 bar) |
| Liquid |
Clean water, glycol up to 30% |
| Liquid temperature |
14 F to 230 F |
| Protection / insulation |
IPX5 (NEMA 4X) / Class F |
| Installation |
Horizontal motor axis |
Models & Performance — Will It Do What You Need?
Models
| Model |
Display |
| EVOSTA 2 55 |
None |
| EVOSTA 2D 55 |
Shows the real working point |
Head in feet, fixed-curve maximum
| Model |
0 GPM (Shut-off) |
4 GPM |
8 GPM |
12 GPM |
15.12 GPM (Max) |
| Evosta 2 and 2d |
17.92 |
17.81 |
11.98 |
7.01 |
3.34 |
From the DAB 60 Hz table (Evosta2 Technical Sheet USA, 2025, p. 5), at the tabulated flows nearest 20%, 50% and 75% of the 15.12 GPM end. The proportional- and constant-pressure modes run below this curve; DAB plots them and tabulates only this one. Both versions share the hydraulic. PSI = ft ÷ 2.31. Curve tolerance to ISO 9906.
Before You Buy — The Limits That Decide the Fit
| Connections |
6-3/8 in centre distance, oval two-bolt flange |
| Liquid |
Clean water, free of solids and mineral oils; glycol up to 30% |
| Liquid temperature |
14 F to 230 F |
| Minimum suction pressure |
32.8 ft of water at 194 F |
| Installation |
Motor axis horizontal |
| Power |
110-127 V single phase |
Applications
Hot water circulation in domestic heating systems, cooling circuits, and replacement of older three-speed circulators.
Materials of Construction
| Pump housing |
Cast iron with cataphoresis treatment |
| Impeller |
Ultrason |
| Motor shaft |
Ceramic (alumina) |
| Bearings |
Alumina; axial bearing graphite |
| Bearing housing |
Brass |
| Rotor can flange |
Stainless steel AISI 316 |
| Rotor sleeve |
Stainless steel AISI 304 |
| Stator housing |
Stainless steel AISI 304 |
| Seals and O-rings |
EPDM |
| Outer shell and cover |
Polycarbonate |
From the DAB Evosta2 Technical Sheet (USA, 2025).
