Grundfos Grundfos CR / CRN
Grundfos CR, CRI and CRN vertical multistage centrifugal pumps, with suction and discharge in line, in sizes with nominal flow from 0.8 to 255 m³/h.
CR is the Grundfos range of vertical, multistage, non-self-priming centrifugal pumps. The suction and discharge ports are at the same level and have the same diameter, so the pump can be installed directly on a horizontal pipe. Between the base and the pump head, the chamber stack and the sleeve are held together by tie rods, and the shaft is sealed with a cartridge-type mechanical seal. CR is made of cast iron and 1.4301 (AISI 304) stainless steel, CRI only of 1.4301 stainless steel, and CRN of 1.4401 (AISI 316) stainless steel, for installations in which all wetted parts must be stainless steel. CRE is the variant with integrated frequency converter.
The code has the form CR 10-5: 10 is the nominal flow, in m³/h, and 5 is the number of impellers; in CRE 32-3-2, the last digit shows how many impellers have a reduced diameter. The group of letters that follows, for example A-F-A-E-HQQE, describes the pump version, the connection, the materials, the rubber parts and the mechanical seal. For a quotation, send us the full code and the product number from the nameplate, the motor voltage and the pumped liquid. When the item is available locally or at the supplier, delivery takes 24–72 h, and on order usually 1–4 weeks.
Models and codes
| Code | Note |
|---|---|
| CR 3-17 | Size 3, with 17 impellers and a 1.5 kW motor. |
| CR 10-5 | Size 10, with 5 impellers and a 2.2 kW motor. |
| CR 15-3 | Size 15, with 3 impellers and a 3 kW motor. |
| CR 20-5 | Size 20, with 5 impellers and a 5.5 kW motor. |
| CRN 5-22 | 1.4401 stainless steel design, size 5, with 22 impellers and a 4 kW motor. |
| CRN 32-2 | 1.4401 stainless steel design, size 32, with 2 impellers and a 4 kW motor. |
| CR 64-2 | Size 64, with 2 impellers and an 11 kW motor. |
| CR 95-4 | Size 95, with 4 impellers and a 30 kW motor. |
| CRE 32-3-2 A-F-A-E-HQQE | Type code example: pump with integrated frequency converter, with 3 impellers, 2 of which have a reduced diameter. |
Key specifications
| Nominal flow (sizes 1s … 255) | 0.8–255 m³/h; operating range 0.3–330 m³/h |
|---|---|
| Liquid temperature | -20…+120 °C (CR, CRN 32–64: from -30 °C); on request, for sizes 1s–155, up to +180 °C (oils up to +240 °C) |
| Maximum operating pressure | up to 40 bar (CRN 95–155), depending on size and number of stages; high-pressure CRN versions, on request, up to 50 bar |
| Motor | 0.37–200 kW, 2 poles, IE4 class from 0.75 kW, IP55 (IP44 and IP54 on request); single-phase 1 × 220-230/240 V at 0.37–2.2 kW |
| Materials | CR: cast iron and stainless steel 1.4301; CRI: stainless steel 1.4301; CRN: stainless steel 1.4401 |
| Connections | oval flange (Rp) on small sizes or DN 25–DN 200 flange; on CRI and CRN, also PJE coupling (Victaulic type) |
| Shaft sealing | cartridge-type mechanical seal; replaced with complete service kits |
The Grundfos data booklet CR, CRI, CRN, 50 Hz IEC, is the 05.2026 edition and covers sizes from CR 1s to CR 255, with no withdrawal notice.
Frequently asked questions
What does the code CR 10-5 mean?
CR is the range, 10 is the nominal flow, in m³/h, and 5 is the number of impellers. A third number, as in CRE 32-3-2, shows how many impellers have a reduced diameter, and the letter E after CR marks the pump with integrated frequency converter.
When is CRN chosen instead of the CR pump?
CRN has all wetted parts made of 1.4401 (AISI 316) stainless steel and is used for industrial liquids, acids and alkalis, reverse osmosis, ultrafiltration or demineralisation. CR and CRI are intended for clean, non-aggressive liquids.
What data do you need for a replacement CR pump?
The full code from the nameplate, with the group of letters after the size, the Grundfos product number, the motor voltage and the pumped liquid. If the nameplate is missing, the flow, the head, the liquid temperature and the connection type help us.
Other Grundfos series
We quote the CR, CRI or CRN pump by the full code and the product number from the nameplate; hydraulic selection on the curve and installation of the pump are outside our quotation.
Updated: 2026-11-12