GRUNDFOS · VERTICAL MULTISTAGE CENTRIFUGAL PUMP
CR 20
Vertical multistage centrifugal pump in cast iron and stainless steel. 9 models from CR 20-1 to CR 20-10, 3 to 25 HP, 2 in oval NPT or ANSI flanged ports, HQQE or HQQV cartridge shaft seal.
66-698 ft (28-302 PSI) Max Head · 154-156 GPM Max
3-25 HP
1Ph to 10 HP · 208-230/460V or 230/460V 3Ph
2 in Oval NPT or ANSI Ports
In-Line Suction and Discharge
NEMA C-Face TEFC or ODP Motor
145-363 PSI Max Operating Pressure
cURus
159-489 lb Weight
Overview
Vertical, multistage centrifugal pump with suction and discharge ports on the same level, so it drops into a straight pipe run. The pump head and base are cast iron; all other wetted parts are stainless steel (EN 1.4301, AISI 304). The CR 20 is rated at 111 GPM, Grundfos’s nominal duty; size it from the performance table below rather than from the model number.
- 9 models, CR 20-1 to CR 20-10, on NEMA C-face TEFC and ODP motors, 3 to 25 HP; single-phase on 3 to 10 HP
- 2 in oval flanges tapped NPT or ANSI flanges
- HQQE (EPDM) or HQQV (FKM) cartridge shaft seal with silicon-carbide faces
- Maximum operating pressure 145, 232 or 363 PSI by model and connection
What Ships and What It Needs to Run
Included: the CR 20 pump end and its NEMA C-face TEFC or ODP motor, factory-assembled as one complete pump. Oval-flange versions include the two oval flanges, tapped 2 in NPT.
ANSI companion flanges required, ordered separately. On the ANSI versions Grundfos supplies the companion connection as a separate set (flange sets: two flanges, two gaskets, nuts and bolts), sized 2 in.
Suction and discharge piping, valves and controls: sized to your system and ordered separately.
Genuine Grundfos equipment, factory-new in original packaging — sold and supported by Watermain Supply, an independent industrial supplier.
Warranty: 24 months from date of installation, but not more than 30 months from date of manufacture (Grundfos limited warranty). Grundfos repairs or replaces its own product; costs of removal, installation and transportation are not covered, and products sold but not manufactured by Grundfos carry their own manufacturer’s warranty.
Specifications
| Specification |
Value |
| Rated flow at 60 Hz |
111 GPM (Grundfos nominal duty) |
| Shut-off head range |
66 to 698 ft (28 to 302 PSI) |
| Motor power range |
3 to 25 HP |
| Supply |
1Ph 115/208-230V, 208-230V, 230V; 3Ph 208-230/460V, 230/460V |
| Motors |
NEMA C-face, TEFC or ODP, 2-pole, service factor 1.15; three-phase motors NEMA Premium (IE3) |
| NEMA frames |
182TC, 213TC, 254TC, 284TC |
| Frequency |
60 Hz |
| Suction and discharge ports |
2 in, in-line |
| Connections |
Oval flanges tapped 2 in NPT (included); 2 in ANSI flanges, 250 lb |
| Maximum operating pressure |
145 PSI / 232 PSI / 363 PSI by model and connection |
| Liquid temperature |
−4 °F to 248 °F with HQQE; −4 °F to 194 °F with HQQV |
| Maximum ambient temperature |
104 °F |
| Pump orientation |
Vertical |
| Approvals |
cURus |
Models & Performance — Will It Do What You Need?
Find the pressure you need at your flow and pick the first model that reaches it. Pressure at flow in PSI, one row per model.
CR 20-1 to CR 20-10 · 9 models · 3 to 25 HP
| Model (HP) |
0 GPM (Shut-off) |
30 GPM |
75 GPM |
113 GPM |
150 GPM |
| CR 20-1 (3 HP) |
28 |
29 |
26 |
20 |
11 |
| CR 20-2 (5 HP) |
59 |
58 |
54 |
44 |
29 |
| CR 20-3 (7 1/2 HP) |
89 |
88 |
83 |
69 |
47 |
| CR 20-4 (10 HP) |
118 |
118 |
111 |
94 |
64 |
| CR 20-5 (15 HP) |
149 |
148 |
140 |
118 |
81 |
| CR 20-6 (15 HP) |
178 |
179 |
168 |
143 |
98 |
| CR 20-7 (20 HP) |
211 |
209 |
198 |
169 |
117 |
| CR 20-8 (20 HP) |
241 |
239 |
226 |
192 |
132 |
| CR 20-10 (25 HP) |
302 |
301 |
285 |
243 |
170 |
Pressure the pump develops at each flow, in PSI, rounded down (feet = PSI × 2.31). Shut-off is Grundfos’s published maximum head for each model. Flow columns are read from the Grundfos 60 Hz curve for each model (water at 68 °F), digitized and rounded down, at 20%, 50% and 75% of 150 GPM, the last regular flow every curve in this listing reaches; the curves end at 154 to 156 GPM. Full curves are in the product images. On CR 20-1, CR 20-6 the curve reads above the published shut-off at low flow (by up to 3 ft); the published shut-off is kept and the flow columns follow the curve. The CR 20-1 curve reads 70 ft at zero flow against 67 ft published; the published figure is shown. Grundfos’s published duty point sits below its own curve by more than 3% of shut-off on CR 20-4, CR 20-6 (by up to 16 ft at the rated flow); the table follows the curve.
Before You Buy — The Limits That Decide the Fit
| Check |
What decides the fit |
| Duty point |
The model’s pressure at your flow must cover the system’s total head; shut-off is the most it can make, at zero flow. |
| Working pressure |
Inlet pressure plus the pressure the pump adds must stay within the model’s maximum operating pressure: 145, 232 or 363 PSI by model and connection. |
| Liquid temperature |
−4 °F to 248 °F with HQQE; −4 °F to 194 °F with HQQV. |
| Power |
Single-phase or three-phase supply at the voltage shown in the selected option. |
| Connections |
ANSI companion flanges (2 in) ordered separately; oval-flange versions ship with NPT flanges. |
| Shaft seal |
HQQE has EPDM rubber parts and HQQV has FKM; choose the rubber that suits the pumped liquid. |
Applications
HVAC heating and air conditioning, district heating and cooling, plumbing pressure boosting, industrial water supply and transfer, process liquids, wash and clean, water treatment, irrigation and ground water transfer (Grundfos CR range applications).
Materials of Construction
| Component |
Material |
| Pump head and base |
Cast iron, ASTM A48 class 25B or 35B by model |
| Other wetted parts |
Stainless steel EN 1.4301 (AISI 304) |
| Bearings |
Silicon carbide |
| Shaft seal faces |
Silicon carbide / silicon carbide (HQQ cartridge seal) |
| Seal and gasket rubber |
EPDM (HQQE) or FKM (HQQV) |
