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Grundfos CRI Vertical Multistage Pumps
Grundfos CRI 10 Vertical Multistage Pump
Grundfos
Grundfos CRI 10 Vertical Multistage Pump
- Price
- From $3,157.34
Grundfos CRI 5 Vertical Multistage Pump
Grundfos
Grundfos CRI 5 Vertical Multistage Pump
- Price
- From $2,028.67
Grundfos CRI 3 Vertical Multistage Pump
Grundfos
Grundfos CRI 3 Vertical Multistage Pump
- Price
- From $1,894
Grundfos CRI Vertical Multistage Pumps
Grundfos CRI
All-Stainless Multistage Pumps
AISI 304 throughout — head, base and every wetted part — for deionised water, reverse osmosis, wash-down and hygiene-sensitive process duty. Three frames, 51 stage configurations, 360 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
All 304wetted parts
NSF/ANSI 61drinking water
Grundfos builds the CR platform in three material grades, and CRI is the all-stainless one. Where CR uses a cast iron pump head and base with stainless internals, CRI is AISI 304 from the base plate up, so the liquid never meets cast iron. The hydraulics are identical to CR — same chambers, same impellers, same duty points — which means choosing CRI is a materials decision, not a performance one.
We supply the U.S. 60 Hz CRI range — CRI 3, CRI 5 and CRI 10 — in FlexiClamp and ANSI 300 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 CRI Line
Three frames separated by rated flow. Pick the frame by flow, then the stage count by head.
CRI 3
15.4 GPM frame, 18 stage options
15.4 GPMrated flow
45-588 ftrated head
1/3 to 5 HPmotor range
362 psimax pressure
All-stainless vertical multistage pump rated 15.4 GPM at 60 Hz, in 18 stage configurations from CRI 3-2 to CRI 3-25. Rated head runs 44.95 ft to 588.3 ft, with shut-off to 785.8 ft on the tallest stack. Head, base and every wetted part are AISI 304.
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
- 1-1/4 in FlexiClamp or 1-1/4 in ANSI 300 lb flanged, both rated 362 psi
- HQQE or HQQV cartridge seal, silicon carbide faces
- 128 part numbers; shipping weight 47-177 lb
Best forDeionised and RO water around 15 GPM, boiler feed, high-head wash-down, and any small-bore duty where a cast iron pump head would contaminate the liquid.
View CRI 3
CRI 5
30.4 GPM frame, 19 stage options
30.4 GPMrated flow
43-584 ftrated head
3/4 to 7-1/2 HPmotor range
362 psimax pressure
All-stainless vertical multistage pump rated 30.4 GPM at 60 Hz, in 19 stage configurations from CRI 5-2 to CRI 5-24. Rated head runs 42.98 ft to 583.7 ft, with shut-off to 774.6 ft on the tallest stack. Head, base and every wetted part are AISI 304.
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 FlexiClamp or 1-1/4 in ANSI 300 lb flanged, both rated 362 psi
- HQQE or HQQV cartridge seal, silicon carbide faces
- 136 part numbers; shipping weight 47-276 lb
Best forTreatment and filtration skids, mid-rise boosting on potable systems, and general process transfer around 30 GPM in hygiene-sensitive or low-conductivity service.
View CRI 5
CRI 10
53.3 GPM frame, 14 stage options
53.3 GPMrated flow
33-638 ftrated head
3/4 to 15 HPmotor range
232 psimax pressure
All-stainless vertical multistage pump rated 53.3 GPM at 60 Hz, in 14 stage configurations from CRI 10-1 to CRI 10-17. Rated head runs 33.14 ft to 638.2 ft, with shut-off to 817 ft on the tallest stack. Head, base and every wetted part are AISI 304.
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 FlexiClamp or 2 in ANSI 300 lb flanged, both rated 232 psi
- HQQE or HQQV cartridge seal, silicon carbide faces
- 96 part numbers; shipping weight 88-395 lb
Best forLarger treatment plant duty, HVAC circulation on clean loops, and industrial process transfer around 50 GPM where the whole wetted path has to be stainless.
View CRI 10
CRI 3 vs CRI 5 vs CRI 10
The deciding axis is rated flow, highlighted below. Watch the pressure rating — it does not rise with frame size.
| Specification | CRI 3 | CRI 5 | CRI 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 | CRI 3-2 to CRI 3-25 | CRI 5-2 to CRI 5-24 | CRI 10-1 to CRI 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 |
| Port size, both connections | 1-1/4 in | 1-1/4 in | 2 in |
| Maximum operating pressure | 362 psi | 362 psi | 232 psi |
| Connections | FlexiClamp or ANSI 300 lb flanged, same port size and pressure rating within each frame | ||
| Wetted materials | AISI 304 head, base, chambers, impellers, shaft and sleeves | ||
| Shaft seal options | HQQE / HQQV | HQQE / HQQV | HQQE / HQQV |
| Shipping weight range | 47-177 lb | 47-276 lb | 88-395 lb |
| Part numbers offered | 128 | 136 | 96 |
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 moves you off the efficient part of the curve — and on CRI it also drops your pressure ceiling from 362 psi to 232 psi.
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 |
|---|---|---|---|---|
| CRI 3-2 | 1/3 | 15.4 | 44.95 | 61.68 |
| CRI 3-3 | 1/2 | 15.4 | 67.26 | 92.2 |
| CRI 3-4 | 3/4 | 15.4 | 90.56 | 124.3 |
| CRI 3-5 | 3/4 | 15.4 | 111.2 | 154.5 |
| CRI 3-6 | 1 | 15.4 | 137.5 | 187 |
| CRI 3-7 | 1-1/2 | 15.4 | 164 | 219.8 |
| CRI 3-8 | 1-1/2 | 15.4 | 185.7 | 250.3 |
| CRI 3-9 | 1-1/2 | 15.4 | 206.7 | 280.9 |
| CRI 3-10 | 2 | 15.4 | 230.7 | 312.7 |
| CRI 3-11 | 2 | 15.4 | 251.7 | 342.9 |
| CRI 3-12 | 2 | 15.4 | 272.3 | 373.4 |
| CRI 3-13 | 3 | 15.4 | 308.4 | 410.1 |
| CRI 3-15 | 3 | 15.4 | 352.7 | 472.1 |
| CRI 3-17 | 3 | 15.4 | 397 | 533.5 |
| CRI 3-19 | 5 | 15.4 | 441.3 | 595.2 |
| CRI 3-21 | 5 | 15.4 | 498.7 | 662.1 |
| CRI 3-23 | 5 | 15.4 | 544 | 724.1 |
| CRI 3-25 | 5 | 15.4 | 588.3 | 785.8 |
| CRI 5-2 | 3/4 | 30.4 | 42.98 | 68.24 |
| CRI 5-3 | 1 | 30.4 | 65.29 | 96.13 |
| CRI 5-4 | 1-1/2 | 30.4 | 93.51 | 135.5 |
| CRI 5-5 | 2 | 30.4 | 115.2 | 164 |
| CRI 5-6 | 2 | 30.4 | 153.2 | 209.3 |
| CRI 5-7 | 3 | 30.4 | 176.5 | 241.8 |
| CRI 5-8 | 3 | 30.4 | 195.5 | 272.3 |
| CRI 5-9 | 3 | 30.4 | 222.1 | 298.6 |
| CRI 5-10 | 5 | 30.4 | 241.2 | 326.1 |
| CRI 5-11 | 5 | 30.4 | 264.8 | 356.6 |
| CRI 5-12 | 5 | 30.4 | 284.8 | 386.2 |
| CRI 5-13 | 5 | 30.4 | 307.8 | 417.7 |
| CRI 5-14 | 5 | 30.4 | 330.7 | 449.5 |
| CRI 5-15 | 5 | 30.4 | 353 | 481 |
| CRI 5-16 | 5 | 30.4 | 375.3 | 512.2 |
| CRI 5-18 | 7-1/2 | 30.4 | 441.6 | 583 |
| CRI 5-20 | 7-1/2 | 30.4 | 489.5 | 647 |
| CRI 5-22 | 7-1/2 | 30.4 | 536.8 | 711 |
| CRI 5-24 | 7-1/2 | 30.4 | 583.7 | 774.6 |
| CRI 10-1 | 3/4 | 53.3 | 33.14 | 46.92 |
| CRI 10-2 | 1-1/2 | 53.3 | 70.87 | 95.15 |
| CRI 10-3 | 3 | 53.3 | 111.6 | 144.4 |
| CRI 10-4 | 3 | 53.3 | 146 | 191.3 |
| CRI 10-5 | 5 | 53.3 | 189.6 | 241.5 |
| CRI 10-6 | 5 | 53.3 | 225.1 | 288.7 |
| CRI 10-7 | 7-1/2 | 53.3 | 259.2 | 334.7 |
| CRI 10-8 | 7-1/2 | 53.3 | 310.7 | 387.2 |
| CRI 10-9 | 7-1/2 | 53.3 | 347.5 | 436.4 |
| CRI 10-10 | 7-1/2 | 53.3 | 383.5 | 482.3 |
| CRI 10-12 | 10 | 53.3 | 462 | 580.7 |
| CRI 10-14 | 15 | 53.3 | 512.5 | 669.3 |
| CRI 10-16 | 15 | 53.3 | 603.7 | 771 |
| CRI 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 CRI, 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 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 more realistic peak. For treatment and process duty, take the flow from the skid or process schedule rather than estimating it. CRI 3 at 15.4 GPM, CRI 5 at 30.4 GPM and CRI 10 at 53.3 GPM cover most treatment-plant and small commercial duties.
3. Check the pressure ceiling — it is not the same across the range
CRI 3 and CRI 5 are rated to 362 psi maximum operating pressure; CRI 10 is rated to 232 psi. That figure has to cover inlet pressure plus pump head, not just pump head. A CRI 10 on a boosted inlet can reach its ceiling well before the taller CRI 5 does.
4. Match the seal to the liquid
HQQE (EPDM) reaches 248 degrees F and handles potable water, hot water and glycol but not mineral oils. HQQV (FKM) is limited to 194 degrees F and is the choice for oils, fuels and liquids that attack EPDM. On deionised water the seal matters as much as the pump material.
5. 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 CRI Do You Need?
Selection by application. Call with your flow, head and liquid for an engineering-led pick.
| Application | Typical demand | Recommended | Notes |
|---|---|---|---|
| Reverse osmosis feed | 15-30 GPM at 200-400 ft | CRI 3-13 up, CRI 5-11 up | Consider CRN in 316 for permeate and anything with chlorides. |
| Deionised or demineralised water transfer | 15-50 GPM at 60-250 ft | CRI 3-4 up, CRI 10-2 up | The reason CRI exists — no cast iron in the wetted path. |
| Wash-down and hygiene-sensitive duty | 25-50 GPM at 150-350 ft | CRI 5-8 to CRI 5-14 | NSF/ANSI 61 listed. Confirm the seal against any cleaning chemistry. |
| Treatment and filtration skids | 30-55 GPM at 100-300 ft | CRI 5-5 up, CRI 10-3 up | Check the 232 psi ceiling on CRI 10 against skid design pressure. |
| Boiler feed | 15-30 GPM at 250-450 ft | CRI 3-17 up, CRI 5-13 up | HQQE seal to 248 degrees F. Confirm NPSH available on hot condensate. |
| Potable water pressure boosting | 15-55 GPM at 60-250 ft | CRI 3, CRI 5 or CRI 10 by flow | CR in cast iron does the same duty for less if iron pick-up is not a concern. |
| HVAC circulation on clean loops | 45-60 GPM at 60-200 ft | CRI 10-2 to CRI 10-6 | Closed loop, so size on friction loss only. |
| High-head process transfer | 15-30 GPM at 400-600 ft | CRI 3-21 up, CRI 5-20 up | Within the 362 psi ceiling on these two frames. |
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 CRI Different
The CR platform, with the cast iron taken out of the liquid path.
All-304 Wetted Path
Head, base, chambers, impellers, shaft and sleeves are AISI 304. On a CR the liquid meets a cast iron head; on a CRI it never does. That is the whole reason to specify it.
Same Curve As CR
Hydraulics are shared across the platform, so a CRI 5-8 and a CR 5-8 land on the same duty point. You can swap material grade late in a project without re-sizing.
In-Line Ports
Suction and discharge share a centreline at the same height, so the pump drops into a straight run with no offset, no elbow and no baseplate.
Head By Stage Count
More head comes from adding chambers, not from a bigger casing. The footprint barely changes between a 2-stage and a 10-stage pump.
Cartridge Shaft Seal
Replaced as a complete cartridge without dismantling the pump, setting faces by hand, or special tools.
Silicon Carbide Faces
Both seal faces are silicon carbide in every option here, not carbon — which is what lets the same seal handle hot water and low-conductivity liquids.
NSF/ANSI 61
Listed for drinking water contact across the range, backed by the all-stainless wetted path rather than a coating.
NEMA C-Face Motors
Standard 56C to 254TC frames, single and three phase. Replacement motors are a stock item from any motor supplier, not a proprietary part.
CR vs CRI vs CRN — Choosing The Grade
We sell every major line, so we can be straight about fit. If CRI is more pump than your liquid needs, we will say so.
| Range | Pump head and base | Wetted internals | Choose it when |
|---|---|---|---|
| CR | Cast iron | AISI 304 | Potable water, glycol, HVAC and general process. The default, and the cheapest of the three. |
| CRI | AISI 304 | AISI 304 | Deionised and RO water, wash-down, hygiene-sensitive duty — anywhere iron pick-up from the head is a problem. |
| CRN | AISI 316 | AISI 316 | Chlorides, mild acids, RO permeate, or anything that will pit 304. |
| CRIE / CRNE | As above | As above | Duty varies, or constant pressure is wanted without a separate VFD and controller. |
Hydraulics are shared across all of them, so the rated duty point does not change with grade — only the materials and the price. CR, CRN and the E-pump ranges are quoted on request.
When a CRI is the wrong pump
CRI needs clean, thin, non-aggressive liquid without solids or fibres. For wastewater or solids-bearing liquid it is the wrong machine and we will quote a submersible or solids-handling pump instead. For a single-stage duty at low head, a close-coupled end suction pump is cheaper and simpler. And if your liquid is ordinary potable water, CR in cast iron will do the same job for less — the stainless head earns its cost only when the liquid demands it. Tell us the liquid and the duty and we will quote what fits, whether or not it is a Grundfos.
CRI 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 300 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 CRI from Watermain Supply
The Right Material Grade
We will tell you when CR in cast iron is enough and when the liquid genuinely needs 304 or 316. Specifying up a grade you do not need is money spent for nothing.
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, including the pressure ceiling that differs between CRI frames.
Multi-Brand Perspective
If CRI is not the right fit, we will say so and quote the one that is — including pumps from other manufacturers.
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 pumps we supplied and for ones we did not.
Frequently Asked Questions
The questions that come up most often on the phone about CRI selection.
What is the difference between CRI and CR?
The materials. CR has a cast iron pump head and base with AISI 304 wetted parts. CRI is AISI 304 throughout, head and base included, so no cast iron touches the liquid. The hydraulics are shared, so a CRI 5-8 and a CR 5-8 have the same rated duty point.
When is CRI worth the extra over CR?
Whenever iron pick-up matters. Deionised and demineralised water, reverse osmosis permeate, wash-down and hygiene-sensitive process duty all attack or are contaminated by a cast iron head. For ordinary potable water, glycol and HVAC service, CR does the same job for less.
What does the number in CRI 3, CRI 5 and CRI 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 CRI 3, 30.4 GPM for CRI 5 and 53.3 GPM for CRI 10. Size from the rated head table on this page, never from the family number.
Why is CRI 10 rated to a lower pressure than CRI 3 and CRI 5?
CRI 3 and CRI 5 are rated to 362 psi maximum operating pressure. CRI 10 is rated to 232 psi. The larger hydraulic section sets the limit, so a bigger pump does not mean a higher pressure rating. Check it against inlet pressure plus pump head before specifying.
What connections are available?
FlexiClamp or ANSI 300 lb flanged, and on CRI both carry the same port size and the same pressure rating within a family. Companion flanges are not included with the ANSI version and are ordered separately.
Is there cast iron anywhere on an ANSI flanged CRI?
The ANSI flanged version uses a cast iron flange and base plate. Grundfos states that neither comes into contact with the pumped liquid, so the wetted path remains all stainless. If you need no cast iron on the pump at all, say so when you order and we will confirm the build.
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.
Is the motor included?
Yes. Every part number 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 CRI range carries NSF/ANSI 61 certification for drinking water contact, and the chambers, impellers, shaft, sleeves, head and base are all AISI 304 stainless steel.
What if I need 316 stainless?
That is CRN, which shares the same hydraulics again in AISI 316 for chlorides, mild acids and anything that will pit 304. Tell us the liquid and we will tell you whether 304 is enough.
Ready to Size Your CRI?
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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