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Grundfos CR Vertical Multistage Pumps
Grundfos CR 5 Vertical Multistage Pump
Grundfos
Grundfos CR 5 Vertical Multistage Pump
- Price
- From $1,870.67
Grundfos CR 10 Vertical Multistage Pump
Grundfos
Grundfos CR 10 Vertical Multistage Pump
- Price
- From $2,884
Grundfos CR 3 Vertical Multistage Pump
Grundfos
Grundfos CR 3 Vertical Multistage Pump
- Price
- From $1,731.34
Grundfos CR Vertical Multistage Pumps
Grundfos CR
Vertical Multistage Pumps
Cast iron and 304 stainless multistage pumps for pressure boosting, HVAC, water treatment and industrial process duty. Three frames, 51 stage configurations, 344 part numbers — sized against the published 60 Hz curve before you order.
15-53 GPMrated flow
to 638 ftrated head
1/3-15 HPmotor range
362 psimax working pressure
NSF/ANSI 61drinking water
Grundfos is a Danish pump manufacturer whose CR range is the reference vertical multistage centrifugal pump for clean, thin liquids. The design puts suction and discharge on the same centreline at the same height, so the pump drops into a straight pipe run without an offset, and head is set by the number of stages rather than by a larger casing. The pump head and base are cast iron; the chambers, impellers, shaft and sleeves in contact with the liquid are AISI 304 stainless steel.
We supply the U.S. 60 Hz CR range — CR 3, CR 5 and CR 10 — in both oval flange NPT and ANSI 250 lb flanged construction, single phase and three phase, with HQQE or HQQV cartridge seals. Every part number is a complete pump with motor, coupling and coupling guard. Compare the frames below, or call 1-888.510.4036 and we will size it for you against the published curve. Genuine Grundfos equipment, factory-new in original packaging — sold and supported by Watermain Supply, an independent industrial supplier.
The CR Line
Three frames separated by rated flow. Pick the frame by flow, then the stage count by head.
CR 3
15.4 GPM frame, 18 stage options
15.4 GPMrated flow
45-588 ftrated head
1/3 to 5 HPmotor range
128part numbers
Vertical multistage centrifugal pump rated 15.4 GPM at 60 Hz, offered in 18 stage configurations from CR 3-2 to CR 3-25. Rated head runs 44.95 ft to 588.3 ft, with shut-off to 785.8 ft on the tallest stack. Suction and discharge sit on the same centreline, so the pump installs in a straight pipe run without an offset.
Key specifications
- Rated flow 15.4 GPM at 60 Hz; rated head 44.95-588.3 ft
- 1/3 to 5 HP, NEMA 56C, 182TC C-face, TEFC
- 1 in oval flange NPT to 232 psi, or 1-1/4 in ANSI 250 lb to 362 psi
- HQQE or HQQV cartridge seal, silicon carbide faces
- Shipping weight 29-184 lb
Best forSmall commercial and mid-rise pressure boosting, reverse osmosis feed, boiler feed, high-head washdown, and any duty around 15 GPM that needs more head than a single-stage pump gives.
View CR 3
CR 5
30.4 GPM frame, 19 stage options
30.4 GPMrated flow
43-584 ftrated head
3/4 to 7-1/2 HPmotor range
136part numbers
Vertical multistage centrifugal pump rated 30.4 GPM at 60 Hz, offered in 19 stage configurations from CR 5-2 to CR 5-24. Rated head runs 42.98 ft to 583.7 ft, with shut-off to 774.6 ft on the tallest stack. Suction and discharge sit on the same centreline, so the pump installs in a straight pipe run without an offset.
Key specifications
- Rated flow 30.4 GPM at 60 Hz; rated head 42.98-583.7 ft
- 3/4 to 7-1/2 HP, NEMA 56C, 182TC, 213TC C-face, TEFC
- 1-1/4 in oval flange NPT to 232 psi, or 1-1/4 in ANSI 250 lb to 362 psi
- HQQE or HQQV cartridge seal, silicon carbide faces
- Shipping weight 53-283 lb
Best forMid-rise and light commercial boosting, chilled and hot water circulation on smaller loops, filtration and treatment skids, and general process transfer around 30 GPM.
View CR 5
CR 10
53.3 GPM frame, 14 stage options
53.3 GPMrated flow
33-638 ftrated head
3/4 to 15 HPmotor range
80part numbers
Vertical multistage centrifugal pump rated 53.3 GPM at 60 Hz, offered in 14 stage configurations from CR 10-1 to CR 10-17. Rated head runs 33.14 ft to 638.2 ft, with shut-off to 817 ft on the tallest stack. Suction and discharge sit on the same centreline, so the pump installs in a straight pipe run without an offset.
Key specifications
- Rated flow 53.3 GPM at 60 Hz; rated head 33.14-638.2 ft
- 3/4 to 15 HP, NEMA 56C, 182TC, 213TC, 254TC C-face, TEFC and ODP
- 2 in oval flange NPT to 232 psi, or 2 in ANSI 250 lb to 362 psi
- HQQE or HQQV cartridge seal, silicon carbide faces
- Shipping weight 104-403 lb
Best forHVAC chilled, hot and condenser water circulation, larger booster sets, industrial process transfer and cooling, and irrigation boosting around 50 GPM.
View CR 10
CR 3 vs CR 5 vs CR 10
The deciding axis is rated flow, highlighted below. Head is a function of how many stages you add within the frame you choose.
| Specification | CR 3 | CR 5 | CR 10 |
|---|---|---|---|
| Rated flow at 60 Hz | 15.4 GPM | 30.4 GPM | 53.3 GPM |
| Nominal duty | 3 m³/h | 5 m³/h | 10 m³/h |
| Stage configurations | 18 | 19 | 14 |
| Model range | CR 3-2 to CR 3-25 | CR 5-2 to CR 5-24 | CR 10-1 to CR 10-17 |
| Rated head range | 44.95-588.3 ft | 42.98-583.7 ft | 33.14-638.2 ft |
| Maximum head at shut-off | 785.8 ft | 774.6 ft | 817 ft |
| Motor range | 1/3 to 5 HP | 3/4 to 7-1/2 HP | 3/4 to 15 HP |
| NEMA frames | 56C, 182TC | 56C, 182TC, 213TC | 56C, 182TC, 213TC, 254TC |
| Motor enclosure | TEFC | TEFC | TEFC or ODP |
| Oval flange NPT port | 1 in | 1-1/4 in | 2 in |
| ANSI 250 lb flange | 1-1/4 in | 1-1/4 in | 2 in |
| Max pressure, oval flange | 232 psi | 232 psi | 232 psi |
| Max pressure, ANSI flanged | 362 psi | 362 psi | 362 psi |
| Shaft seal options | HQQE / HQQV | HQQE / HQQV | HQQE / HQQV |
| Shipping weight range | 29-184 lb | 53-283 lb | 104-403 lb |
| Part numbers offered | 128 | 136 | 80 |
Quick rule. Choose the frame whose rated flow is closest to your design flow, then add stages until the rated head clears your duty. Going up a frame to gain head is the wrong move — it moves you off the efficient part of the curve. Add stages instead.
Rated Performance
Published Grundfos duty points for the U.S. 60 Hz models. Rated head is the duty point at rated flow; maximum head is the shut-off ceiling at zero flow, not a working point.
| Model | Motor HP | Rated flow - GPM | Rated head - ft | Max head - ft |
|---|---|---|---|---|
| CR 3-2 | 1/3 | 15.4 | 44.95 | 61.68 |
| CR 3-3 | 1/2 | 15.4 | 67.26 | 92.2 |
| CR 3-4 | 3/4 | 15.4 | 90.56 | 124.3 |
| CR 3-5 | 3/4 | 15.4 | 111.2 | 154.5 |
| CR 3-6 | 1 | 15.4 | 137.5 | 187 |
| CR 3-7 | 1 1/2 | 15.4 | 164 | 219.8 |
| CR 3-8 | 1 1/2 | 15.4 | 185.7 | 250.3 |
| CR 3-9 | 1 1/2 | 15.4 | 206.7 | 280.9 |
| CR 3-10 | 2 | 15.4 | 230.7 | 312.7 |
| CR 3-11 | 2 | 15.4 | 251.7 | 342.9 |
| CR 3-12 | 2 | 15.4 | 272.3 | 373.4 |
| CR 3-13 | 3 | 15.4 | 308.4 | 410.1 |
| CR 3-15 | 3 | 15.4 | 352.7 | 472.1 |
| CR 3-17 | 3 | 15.4 | 397 | 533.5 |
| CR 3-19 | 5 | 15.4 | 441.3 | 595.2 |
| CR 3-21 | 5 | 15.4 | 498.7 | 662.1 |
| CR 3-23 | 5 | 15.4 | 544 | 724.1 |
| CR 3-25 | 5 | 15.4 | 588.3 | 785.8 |
| CR 5-2 | 3/4 | 30.4 | 42.98 | 68.24 |
| CR 5-3 | 1 | 30.4 | 65.29 | 96.13 |
| CR 5-4 | 1 1/2 | 30.4 | 93.51 | 135.5 |
| CR 5-5 | 2 | 30.4 | 115.2 | 164 |
| CR 5-6 | 2 | 30.4 | 153.2 | 209.3 |
| CR 5-7 | 3 | 30.4 | 176.5 | 241.8 |
| CR 5-8 | 3 | 30.4 | 195.5 | 272.3 |
| CR 5-9 | 3 | 30.4 | 222.1 | 298.6 |
| CR 5-10 | 5 | 30.4 | 241.2 | 326.1 |
| CR 5-11 | 5 | 30.4 | 264.8 | 356.6 |
| CR 5-12 | 5 | 30.4 | 284.8 | 386.2 |
| CR 5-13 | 5 | 30.4 | 307.8 | 417.7 |
| CR 5-14 | 5 | 30.4 | 330.7 | 449.5 |
| CR 5-15 | 5 | 30.4 | 353 | 481 |
| CR 5-16 | 5 | 30.4 | 375.3 | 512.2 |
| CR 5-18 | 7 1/2 | 30.4 | 441.6 | 583 |
| CR 5-20 | 7 1/2 | 30.4 | 489.5 | 647 |
| CR 5-22 | 7 1/2 | 30.4 | 536.8 | 711 |
| CR 5-24 | 7 1/2 | 30.4 | 583.7 | 774.6 |
| CR 10-1 | 3/4 | 53.3 | 33.14 | 46.92 |
| CR 10-2 | 1 1/2 | 53.3 | 70.87 | 95.15 |
| CR 10-3 | 3 | 53.3 | 111.6 | 144.4 |
| CR 10-4 | 3 | 53.3 | 146 | 191.3 |
| CR 10-5 | 5 | 53.3 | 189.6 | 241.5 |
| CR 10-6 | 5 | 53.3 | 225.1 | 288.7 |
| CR 10-7 | 7 1/2 | 53.3 | 259.2 | 334.7 |
| CR 10-8 | 7 1/2 | 53.3 | 310.7 | 387.2 |
| CR 10-9 | 7 1/2 | 53.3 | 347.5 | 436.4 |
| CR 10-10 | 7 1/2 | 53.3 | 383.5 | 482.3 |
| CR 10-12 | 10 | 53.3 | 462 | 580.7 |
| CR 10-14 | 15 | 53.3 | 512.5 | 669.3 |
| CR 10-16 | 15 | 53.3 | 603.7 | 771 |
| CR 10-17 | 15 | 53.3 | 638.2 | 817 |
Boost in psi equals head in feet multiplied by 0.433. Figures are the published rated duty points; for a duty between two models, or for flows away from the rated point, request the Grundfos curve for the exact model. Confirm against the current Grundfos 60 Hz data booklet before specifying.
Sizing & Best Practices
How we size a CR, and what to check before it goes in.
1. Calculate required boost
Required boost = target pressure at the highest fixture + 0.433 psi per foot of elevation + friction loss − inlet pressure. A four-storey building needing 45 psi at the top fixture, 40 ft above the pump, with 8 psi of friction and 30 psi at the inlet, needs 45 + 17.3 + 8 − 30 = 40.3 psi of boost, which is 93 ft of head. On a closed HVAC loop there is no static lift to overcome, so the calculation is friction loss around the loop only.
2. Estimate peak flow honestly
For residential and multi-unit, convert fixture units with WSFU and Hunter’s curve (IPC Table 604.3). For light commercial, the IAPMO Water Demand Calculator gives a less conservative and more realistic peak. For HVAC and process duty, take the flow from the coil, chiller or process schedule rather than estimating it. A CR 3 at 15.4 GPM, a CR 5 at 30.4 GPM and a CR 10 at 53.3 GPM cover most small commercial boosting and HVAC circulation duties.
3. Check the model limits
Confirm the connection rating against system pressure: oval flange models are limited to 232 psi and ANSI 250 lb flanged models to 362 psi, and that includes inlet pressure plus pump head. Confirm liquid temperature against the seal — HQQE reaches 248 degrees F, HQQV only 194 degrees F. Maximum ambient is 104 degrees F. Three-phase models need a correctly sized starter or overload; single-phase models still need a correctly rated branch circuit and disconnect.
4. Check NPSH before you commit
Multistage pumps are sensitive to available suction head. Confirm NPSH available at the design flow against NPSH required from the curve for the exact model, with margin, particularly on hot water and on any suction lift.
Sizing rule of thumb. If the duty point lands past 70 percent of a model’s maximum head at design flow, step up a stage count. Running near shut-off wastes energy and shortens seal life.
Which CR Do You Need?
Selection by application. Call with your flow, head and liquid for an engineering-led pick.
| Application | Typical demand | Recommended | Notes |
|---|---|---|---|
| Small commercial pressure boosting | 12-18 GPM at 60-150 ft | CR 3-4 to CR 3-10 | Oval flange NPT is usually sufficient at these pressures. |
| Mid-rise pressure boosting | 25-35 GPM at 150-300 ft | CR 5-8 to CR 5-14 | Check the 232 psi oval flange limit; step to ANSI flanged above it. |
| HVAC chilled or hot water circulation | 45-60 GPM at 60-200 ft | CR 10-2 to CR 10-6 | Closed loop, so size on friction loss only. HQQE for hot water. |
| Reverse osmosis feed | 15-30 GPM at 200-400 ft | CR 3-13 up, CR 5-11 up | ANSI flanged for the pressure. Consider CRI or CRN for permeate. |
| Boiler feed | 15-30 GPM at 250-450 ft | CR 3-17 up, CR 5-13 up | HQQE seal to 248 degrees F. Confirm NPSH available on hot condensate. |
| Industrial process transfer | 50 GPM at 100-400 ft | CR 10-3 to CR 10-10 | Check liquid compatibility; HQQV for oils and fuels. |
| High-head washdown or spray | 15-30 GPM at 400-600 ft | CR 3-21 up, CR 5-20 up | ANSI flanged only at these heads. |
| Irrigation booster | 30-55 GPM at 100-250 ft | CR 5-5 to CR 5-10, CR 10-3 | Confirm the filter and inlet condition; CR needs clean liquid. |
Recommendations are a starting point from the rated duty points on this page, not a substitute for sizing against the curve at your actual duty.
What Makes CR Different
Why this design has been the reference multistage pump for three decades.
In-Line Ports
Suction and discharge share a centreline at the same height. The pump drops into a straight run with no offset, no elbow and no baseplate, which is why CR retrofits into existing pipework so easily.
Head By Stage Count
More head comes from adding chambers, not from a bigger casing or a faster motor. The footprint barely changes between a 2-stage and a 10-stage pump, so a system can be re-rated by changing the stack.
Cartridge Shaft Seal
The seal is replaced as a complete cartridge without dismantling the pump, without setting faces by hand and without special tools. It is the single biggest difference in maintenance time against older multistage designs.
Silicon Carbide Faces
Both seal faces are silicon carbide in every option listed here, not carbon. That is what lets the same seal handle hot water, glycol and mildly abrasive service without premature failure.
304 Stainless Wetted Path
Chambers, impellers, shaft and sleeves are AISI 304 with a cast iron head and base. The liquid never touches the cast iron on the pressure side, which is what earns the NSF/ANSI 61 listing.
Two Pressure Classes
The same hydraulics are offered in a 232 psi oval flange build and a 362 psi ANSI 250 lb build. You pick the pressure class at order rather than moving to a different pump family.
NEMA C-Face Motors
Standard NEMA C-face frames from 56C to 254TC, single and three phase. Replacement motors are a stock item from any motor supplier rather than a proprietary part.
Shared Platform
CR, CRI and CRN share hydraulics and differ only in materials, and CRE adds an integrated drive. Moving to all-stainless or to variable speed keeps the same duty point and the same footprint.
Materials, Ranges and When To Step Sideways
We sell every major line, so we can be straight about fit. If CR is not the right pump for your liquid or your duty, we will say so.
Within the Grundfos multistage platform
| Range | Wetted materials | Speed | Step to it when |
|---|---|---|---|
| CR | Cast iron head and base, AISI 304 chambers, impellers, shaft | Fixed | Clean water, glycol and general process duty. The default. |
| CRI | All AISI 304, including head and base | Fixed | The cast iron head is a problem — deionised water, wash-down, or where iron pick-up matters. |
| CRN | All AISI 316 | Fixed | Chlorides, mild acids, RO permeate or anything 304 will pit. |
| CRE / CRIE / CRNE | As above | Variable, integrated drive | Duty varies, or constant pressure is required without a separate VFD and controller. |
Hydraulics are shared across the ranges, so a CR 5-8 and a CRN 5-8 have the same rated duty point. The choice is materials and control, not performance. CRI, CRN and the E-pump ranges are quoted on request.
When a CR is the wrong pump
CR needs clean, thin, non-aggressive liquid without solids or fibres. For wastewater, solids-bearing or stringy liquid it is the wrong machine and we will quote a submersible or a solids-handling pump instead. For a single-stage duty at low head, a close-coupled end suction pump is cheaper and simpler. For deep well service, a submersible is the right answer. Tell us the liquid and the duty and we will quote the pump that fits, whether or not it is a Grundfos.
CR Accessories & Service Parts
Factory parts that complete or maintain an installation — product pages linked as they publish.
Shaft Seal Kits
Complete cartridge seal in HQQE or HQQV, by pump family and size.
Gasket Kits
EPDM or FKM gasket sets matched to the seal elastomer.
Companion Flanges
Required separately for every ANSI 250 lb flanged pump. Not supplied with the pump.
Wear Parts & Chamber Stacks
Neck rings, bearings and complete chamber stacks by model.
Motor Protection
Starters, overloads and motor protection sized to the pump.
Genuine Grundfos spare parts are available by model and part number; send us the pump nameplate and we will identify the correct kit.
Why Source Grundfos CR from Watermain Supply
The Right US Build
60 Hz hydraulics, NEMA C-face motors and the voltage and phase your service actually has. The 50 Hz metric equivalents look identical on paper and will not perform to the same curve.
Engineering-Led Sizing
Send the flow, head, liquid and temperature and we size against the published curve rather than reading a family number off a label. We will tell you when the duty lands too close to shut-off.
Multi-Brand Perspective
If CR is not the right fit, we will say so and quote the one that is — including pumps from other manufacturers.
Complete System, One Order
Pump, companion flanges, seal kit and motor protection quoted together, so nothing is discovered missing on the install day.
Account Terms Available
Net-30 for qualified contractor, property-management and municipal accounts.
Parts & Aftermarket
Seal kits, gasket kits, wear parts and chamber stacks identified from the pump nameplate, for CR pumps we supplied and for ones we did not.
Frequently Asked Questions
The questions that come up most often on the phone about CR selection.
What does the number in CR 3, CR 5 and CR 10 mean?
It is the nominal duty in cubic metres per hour, not gallons per minute. At 60 Hz the rated flows are 15.4 GPM for CR 3, 30.4 GPM for CR 5 and 53.3 GPM for CR 10. Size from the rated head table on this page, never from the family number.
What does the second number mean, as in CR 3-10?
It is the stage count. More stages produce more head at the same flow without changing the pump footprint, so head rises from 45 ft on a CR 3-2 to 588 ft on a CR 3-25 while the rated flow stays at 15.4 GPM.
What is the difference between HQQE and HQQV seals?
The final letter is the rubber. HQQE uses EPDM and is the standard water seal, rated minus 4 to 248 degrees F, suitable for potable water, hot water and glycol but not mineral oils. HQQV uses FKM and is rated minus 4 to 194 degrees F, for mineral oils, fuels and liquids that attack EPDM. Both use silicon carbide faces.
Should I order oval flange NPT or ANSI flanged?
Oval flange takes pipe thread and is rated to 232 psi. ANSI 250 lb bolts to a flanged line and is rated to 362 psi. They are not interchangeable in the field. Companion flanges are not included with ANSI flanged pumps and are ordered separately; oval-flange models include their oval flanges.
Is the motor included?
Yes. Every part number on these pages is a complete pump: pump end, motor, coupling, coupling guard and shaft seal, factory assembled and tested. Pump ends without motors are a separate range.
Are these pumps certified for drinking water?
Yes. The CR range carries NSF/ANSI 61 certification for drinking water contact. The pump head and base are cast iron; the chambers, impellers, shaft and sleeves are AISI 304 stainless steel.
What is the difference between CR, CRI and CRN?
CR has a cast iron head and base with 304 stainless wetted parts. CRI is all 304 stainless. CRN is 316 stainless for more aggressive liquids. The hydraulics are shared, so a CR 5-8 and a CRN 5-8 have the same rated duty.
Can I get variable speed?
Not in the CR range as listed here, which is fixed speed. The CRE range carries an integrated variable frequency drive on the motor. Tell us the duty and we will quote whichever suits the application.
What is the maximum operating pressure?
232 psi on oval flange models and 362 psi on ANSI 250 lb flanged models. Maximum ambient temperature is 104 degrees F. Liquid temperature depends on the seal selected.
How do I pick between CR 3, CR 5 and CR 10?
By flow first, then head. CR 3 covers roughly 15 GPM, CR 5 roughly 30 GPM and CR 10 roughly 53 GPM at the rated duty point. Choose the family whose rated flow is closest to your design flow, then pick the stage count that meets the head. Call 1-888.510.4036 with the duty and we will size it.
Ready to Size Your CR?
Send us your flow, required head, liquid, temperature and available voltage. We will respond with a sized selection, the matching part number, accessories and lead time.
Technical data on this page is taken from Grundfos U.S. 60 Hz product literature and is subject to change by the manufacturer. Confirm against the current installation manual and pump curve before specifying.
Grundfos, CR, CRI, CRN and CRE are trademarks of Grundfos Holding A/S, used here for product identification only.
Watermain Supply is a DBA of E4 Industrial LLC, an independent industrial supplier based in Houston, Texas.
Grundfos, CR, CRI, CRN and CRE are trademarks of Grundfos Holding A/S, used here for product identification only.
Watermain Supply is a DBA of E4 Industrial LLC, an independent industrial supplier based in Houston, Texas.
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