Grundfos CR 3-6 — material number 99916315 — is a 6-stage Grundfos CR vertical multistage centrifugal pump with a 1 HP, 3-phase, 208-230/460 V NEMA TEFC motor and a HQQE shaft seal.
The 6-stage build delivers 330 ft of head (18 GPM, ~142 psi) at the BEP and a 396 ft shutoff — the typical pick for mid-rise pressure boosting, RO pretreatment, and cooling-tower makeup.
Specifications
| Model | CR 3-6 |
| Stages | 6 |
| Flow at BEP | 18 GPM |
| Head at BEP | 330 ft (~142 psi) |
| Shutoff head (approx.) | 396 ft |
| Motor | 1 HP, 3-phase, 208-230/460 V, NEMA TEFC on 56C frame |
| Shaft seal | HQQE (SiC/Carbon EPDM) |
| Materials | Cast iron head/base; 304 SS chambers and impellers |
| Material number (P/N) | 99916315 |
| Shipping weight | 61 lbs |
| Frequency | 60 Hz |
| Brand | Grundfos |
| Country of origin | Denmark / USA (varies by date code) |
Dimensions
| Approximate dimensions (vertical pump) | |
|---|---|
| Overall height (pump + motor) | 37.3 in |
| Pump body height (6 stages) | 25.3 in |
| Base height (stage 0) | 14.5 in |
| Added height per stage | 1.8 in |
| Motor frame | See spec table above |
| Mounting | Vertical foot-mounted |
| Motor orientation | Vertical with NEMA motor stool above pump head |
Note: Dimensions are approximate and based on the Grundfos CR 3 data booklet. Exact dimensions vary slightly by motor frame and base style. For certified installation drawings of this specific material number, request a quote and we'll provide the official Grundfos dimensional drawing.
Pipe Connections
The Grundfos CR 3 series is available with multiple connection types to match your installation requirements. Connection sizes for this series:
| Connection options | |
|---|---|
| Standard pipe connection (oval flange) | 1 inch NPT |
| ANSI flange size | 1-1/4 inch |
| ANSI flange class | 250 lb |
| Inlet / outlet orientation | Suction and discharge on the same horizontal centerline (in-line) |
Companion connections (gaskets, bolts, ANSI flanges or Victaulic couplings) are ordered separately. Contact ForeverPure for the matched connection kit part numbers for your specific configuration.
Available Configurations / Material Numbers
The CR 3-6 ships in several phase, voltage, and seal combinations. Material numbers for the most common variants:
| Phase / Voltage | Seal | Motor HP | Weight | Material Number |
|---|---|---|---|---|
| 1-phase, 115/230 | HQQE | 1 HP | 81 lbs | 99916250 |
| 3-phase, 208-230/460 | HQQE | 1 HP | 61 lbs | 99916315 |
| 1-phase, 115/230 | HQQV | 1 HP | 81 lbs | 99916264 |
| 3-phase, 208-230/460 | HQQV | 1 HP | 61 lbs | 99916329 |
| 3-phase, 208-230/460 | HQQV | 1 HP | 62 lbs | 99916316 |
| 1-phase, 115/208-230 | HQQV | 1 HP | 85 lbs | 99916265 |
| 3-phase, 208-230/460 | HQQV | 1 HP | 62 lbs | 99916330 |
| 3-phase, 208-230/460 | HQQV | 1 HP | 63 lbs | 99916317 |
| 1-phase, 115/208-230 | HQQV | 1 HP | 86 lbs | 99916266 |
| 3-phase, 208-230/460 | HQQV | 1 HP | 63 lbs | 99916331 |
| 3-phase, 208-230/460 | HQQV | 1 HP | 64 lbs | 99916318 |
| 1-phase, 115/208-230 | HQQV | 1 HP | 87 lbs | 99916267 |
| 3-phase, 208-230/460 | HQQV | 1 HP | 29 lbs | 99916332 |
| 1-phase, 115/230 | HQQE | 1 HP | 91 lbs | 99916278 |
| 3-phase, 208-230/460 | HQQE | 1 HP | 71 lbs | 99916343 |
| 1-phase, 115/230 | HQQV | 1 HP | 91 lbs | 99916297 |
| 3-phase, 208-230/460 | HQQV | 1 HP | 71 lbs | 99916361 |
| 3-phase, 208-230/460 | HQQV | 1 HP | 72 lbs | 99916344 |
| 1-phase, 115/208-230 | HQQV | 1 HP | 95 lbs | 99916298 |
| 3-phase, 208-230/460 | HQQV | 1 HP | 72 lbs | 99916362 |
| 3-phase, 208-230/460 | HQQV | 1 HP | 73 lbs | 99916345 |
| 1-phase, 115/208-230 | HQQV | 1 HP | 96 lbs | 99916299 |
| 3-phase, 208-230/460 | HQQV | 1 HP | 73 lbs | 99916363 |
| 3-phase, 208-230/460 | HQQV | 1 HP | 74 lbs | 99916346 |
| 1-phase, 115/208-230 | HQQV | 1 HP | 97 lbs | 99916300 |
| 3-phase, 208-230/460 | HQQV | 1 HP | 74 lbs | 99916364 |
Typical Applications
- Boiler feed water in industrial steam plants
- Cooling tower makeup water
- High-rise commercial pressure boosting
- HVAC chilled water circulation
- Fire protection jockey pump
- Light industrial process water
Datasheet & Documentation
- Grundfos CR/CRI/CRN North America Data Booklet (PDF)
- CR/CRI/CRN/CRT Installation & Operating Instructions (PDF)
- CR Service Manual (PDF)
Frequently Asked Questions
- What is the maximum head/flow of the Grundfos CR 3-6?
- The CR 3-6 produces approximately 330 ft of head at 18 GPM (best efficiency point), with a shutoff head of about 396 ft. That corresponds to roughly 142 psi at the BEP.
- What is the Grundfos CR 3-6 material number / part number?
- The primary material number for this configuration (3-phase 208-230/460, HQQE seal) is 99916315. Other voltage and seal options are listed in the variants table on this page.
- Which motor does the Grundfos CR 3-6 use?
- This SKU ships with a 1 HP, 3-phase, 208-230/460 V NEMA TEFC motor on a 56C frame. Other motor configurations and IE3/IE5 upgrades are available on request.
- Can the Grundfos CR 3-6 be paired with a variable frequency drive (VFD)?
- Yes. Order the matching E-Pump variant with integrated MLE permanent-magnet motor, or pair this fixed-speed pump with a Grundfos CUE external VFD.
- What is the typical lead time for the Grundfos CR 3-6?
- Many configurations of the CR 3 series ship from stock through Grundfos USA. Contact ForeverPure Place for the current lead time on this specific material number (99916315).
Related Products
- Browse all Grundfos CR 3 stage configurations
- All CR, CRI, CRN vertical multistage pumps
- Complete Grundfos catalog
