Grundfos 16S SP Submersible Well Pump

HP - Motor Dia: 1/2 HP - 4 in Motor

1/2 HP - 4 in Motor

3/4 HP - 4 in Motor

1 HP - 4 in Motor

1-1/2 HP - 4 in Motor

2 HP - 4 in Motor

3 HP - 4 in Motor

5 HP - 4 in Motor

7-1/2 HP - 6 in Motor

10 HP - 6 in Motor

Voltage - Phase: 115V 1Ph 2-Wire

115V 1Ph 2-Wire

115V 1Ph 3-Wire

230V 1Ph 2-Wire

230V 1Ph 3-Wire

230V 3Ph

460V 3Ph

Model - Head: 16S05-5 - 112 ft at 16 GPM

16S05-5 - 112 ft at 16 GPM

16S07-8 - 177 ft at 16 GPM

16S10-10 - 223 ft at 16 GPM

16S15-14 - 313 ft at 16 GPM

16S20-18 - 397 ft at 16 GPM

16S30-24 - 533 ft at 16 GPM

16S50-38 - 832 ft at 16 GPM

16S75-56DS - 1224 ft at 16 GPM

16S100-75DS - 1636 ft at 16 GPM

Product variant with selected options does not exist!

Quantity

Price: $1,380.86

SKU: 10019205

Weight : 23.0 lb

Vendor : Grundfos

Loading locations...

Free Shipping $499 or more

Skip the chatbot. Talk to an expert.
1-888.510.4036 · Same-day shipping available

Description

Grundfos · Submersible Well Pump

16S SP

16 GPM class stainless steel submersible well pump for 4 in and larger wells: 24 complete builds from 1/2 to 10 HP on Grundfos 4 in and 6 in motors, with a 1-1/4 in NPT discharge.

16 GPM Rated Flow

1/2-10 HP

112-1,636 ft Nominal Head

1-1/4 in NPT Discharge

4 in Min. Well (6 in DS) · 6 in on 6 in Motors

115V and 230V 1Ph · 230V and 460V 3Ph

AISI 304 Stainless Steel

4.0-5.5 in Dia x 21.3-109.2 in L

21.6-190.0 lb Weight

Overview

The Grundfos 16S is the 16 GPM class of the Grundfos SP 4 in submersible range: a multistage pump end in AISI 304 stainless steel, factory-assembled on a Grundfos 4 in or 6 in submersible motor and sold as one complete pump. The 9 models run from 1/2 to 10 HP, single-phase 2-wire or 3-wire and three-phase, for household and farm wells, irrigation and light commercial supply.

Builds marked DS are built into a stainless steel sleeve and need a 6 in well.

Stainless steel hydraulics. Standard S-series impellers and chambers are AISI 304 stainless steel, supported by stainless external components.
Sand-handling bearing design. Water-lubricated bearings and sand channels reduce abrasive wear in suitable well-water service.
Built-in check valve. Helps prevent backflow after shutdown and reduces the risk of water hammer.
Upthrust control. A stop ring limits axial movement of the shaft during startup.
Protected inlet and cable routing. The inlet strainer limits larger-particle entry, while the screw-mounted cable guard secures the motor lead along the pump.

What Ships and What It Needs to Run

Included: the 16S pump end and its Grundfos motor, factory-assembled as one complete pump.

Single-phase 3-wire builds: control box required, ordered separately. Use the Grundfos SA-SPM6 3-Wire Control Box matched to the motor horsepower; the box for each HP is in the Control Box by Horsepower table under Models & Performance. The 1/2 and 3/4 and 1 HP boxes are sold in packs of ten.

Single-phase 2-wire builds: no control box needed; Grundfos states the 2-wire motor needs no external starting control box.

Three-phase builds: magnetic starter or drive required, ordered separately. Wire the motor through a starter or a drive (VFD) rated for its horsepower and voltage.

Drop cable and splice kit: sized to your setting depth 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. In Grundfos's words, products are “warranted to the original user only to be free of defects in material and workmanship”; the full terms are in the installation and operating instructions on the Data Sheet tab.

Specifications

Specification	Value
Rated flow	16 GPM nominal; actual flow depends on the selected model and system head
Horsepower	1/2 to 10 HP
Supply options	115V 1Ph; 230V 1Ph; 230V 3Ph; 460V 3Ph
Motor diameter	4 in or 6 in, depending on the complete-pump part number
Motor families	MS402, MS4000C, MS6000C; configuration depends on selected assembly
Discharge	1-1/4 in NPT; 1-1/2 in NPT male
Well diameter	Assemblies with 4-inch motors and no DS suffix fit 4-inch and larger wells. DS models and assemblies with 6-inch motors require a 6-inch minimum well.
Maximum sand content	50 ppm for SP 5S-25S
Minimum pump submergence	2 ft below pumping water level, subject to installation requirements and adequate motor cooling
Curve tolerance	ISO 9906 Annex A
Included	Pump end and motor, assembled as one complete pump

Source: Grundfos SP data booklet and SP 16S data sheet, 60 Hz.

Models & Performance — Will It Do What You Need?

Each table reads like the curve: the head the pump adds at shut-off, along its curve and at the rated flow of 16 GPM, out to the end of the published curve. Pick a model whose head at your flow covers the pumping level, the pressure you need at the surface (2.31 ft per psi) and pipe friction.

Model	HP	0 GPM (Shut-off)	4.1 GPM	10.3 GPM	16 GPM (Rated)	20.6 GPM (Max)
16S05-5	1/2	149	142	127	112	68
16S07-8	3/4	238	226	201	177	107
16S10-10	1	299	283	252	223	135
16S15-14	1-1/2	419	397	354	313	190
16S20-18	2	536	508	451	397	238
16S30-24	3	717	679	605	533	323
16S50-38	5	1133	1077	981	832	593
16S75-56DS	7-1/2	1668	1585	1442	1224	869
16S100-75DS	10	2230	2116	1920	1636	1149

Total head in feet. The shut-off and flow columns are read from the Grundfos 60 Hz curves, digitized from the published vector curves in the Grundfos SP 16S data sheet (60 Hz), at the nearest published point and rounded down. The (Rated) column is the nominal head Grundfos prints for each model at its rated flow, verbatim; where two figures are shown, builds on different motors or voltages differ slightly. Grundfos's curve and printed table disagree here. 16S: the published curve reads below the printed nominal head at 16 GPM by about 6% of shut-off head on the median model. Both are shown as published; we check your duty point against the curve before you order. 1 ft of head = 0.433 PSI. Full curves are in the product images and on the Data Sheet tab.

Control Box by Horsepower (single-phase 3-wire builds)

Motor HP	Volts	Models	Standard control box
1/2 HP	115V	16S05-5	98821580 (10-pack)
1/2 HP	230V	16S05-5	98821631 (10-pack)
3/4 HP	230V	16S07-8	98821632 (10-pack)
1 HP	230V	16S10-10	98821633 (10-pack)
1-1/2 HP	230V	16S15-14	98315254
2 HP	230V	16S20-18	98315256
3 HP	230V	16S30-24	98315258
5 HP	230V	16S50-38	98315260

Grundfos US price list, January 2026, p. 48. Every box, Standard and Deluxe, is on our Grundfos SA-SPM6 3-Wire Control Box listing. Three-phase builds need a magnetic starter or drive instead.

What It Delivers on a 30/50 Pressure Switch

Output at 30 and 50 PSI · 1/2 to 3 HP · 6 models · depths 20 to 600 ft

GPM at 30 PSI (switch cut-in), by depth to pumping water level

Model	20 ft	80 ft	140 ft	220 ft	280 ft	400 ft	600 ft
16S05-5	17.3	1.6	—	—	—	—	—
16S07-8	21.2	16.9	7.5	—	—	—	—
16S10-10	—	19.3	14.8	3.3	—	—	—
16S15-14	—	—	19.2	15.1	9.8	—	—
16S20-18	—	—	—	18.6	16.3	7.9	—
16S30-24	—	—	—	—	19.4	16.3	4.7

GPM at 50 PSI (switch cut-out), by depth to pumping water level

Model	20 ft	80 ft	140 ft	220 ft	280 ft	400 ft	600 ft
16S05-5	6.5	—	—	—	—	—	—
16S07-8	17.9	10.7	—	—	—	—	—
16S10-10	20.0	16.3	8.8	—	—	—	—
16S15-14	—	19.8	17.2	11.2	3.9	—	—
16S20-18	—	—	19.6	16.8	13.8	3.2	—
16S30-24	—	—	—	19.8	18.3	14.3	—

Output at 30 and 50 PSI · 5 HP · 1 model · depths 400 to 1000 ft

GPM at 30 PSI (switch cut-in), by depth to pumping water level

Model	400 ft	460 ft	520 ft	700 ft	800 ft	900 ft	1000 ft
16S50-38	—	21.4	20.5	17.2	14.5	10.5	4.5

GPM at 50 PSI (switch cut-out), by depth to pumping water level

Model	400 ft	460 ft	520 ft	700 ft	800 ft	900 ft	1000 ft
16S50-38	21.6	20.7	19.8	16.1	12.8	8.0	0.8

Output at 30 and 50 PSI · 7-1/2 HP · 1 model · depths 800 to 1100 ft

GPM at 30 PSI (switch cut-in), by depth to pumping water level

Model	800 ft	900 ft	1000 ft	1100 ft
16S75-56DS*	—	19	18	16.5

GPM at 50 PSI (switch cut-out), by depth to pumping water level

Model	800 ft	900 ft	1000 ft	1100 ft
16S75-56DS*	20	18.5	17.5	15.5

Output at 30 and 50 PSI · 10 HP · 1 model · depths 1100 to 1100 ft

GPM at 30 PSI (switch cut-in), by depth to pumping water level

Model	1100 ft
16S100-75DS*	20

GPM at 50 PSI (switch cut-out), by depth to pumping water level

Model	1100 ft
16S100-75DS*	20

Printed values: copied as printed from the Grundfos 16 gpm easy selection chart (SQ, SQE, SmartFlo and SP data booklet, 60 Hz, p. 58), in GPM by depth to pumping water level at the pressure shown. Grundfos notes the values are approximate. They track the published curve at depth plus pressure head, so riser and pipe friction are not allowed for; add them on a long or small-diameter drop. A dash means Grundfos prints no value at that depth: on the shallow side the pump runs past the end of its curve, on the deep side it cannot reach that pressure. * Calculated, not printed: Grundfos prints no chart row for 16S75-56DS, 16S100-75DS. Those cells are the flow where the published 60 Hz curve meets the depth plus 69 ft (30 PSI) or 116 ft (50 PSI), interpolated between published points and rounded down to 0.5 GPM.

Submersible Calculator

Before You Buy — The Limits That Decide the Fit

Check	What to confirm
Well size	Assemblies with 4-inch motors and no DS suffix fit 4-inch and larger wells. DS models and assemblies with 6-inch motors require a 6-inch minimum well.
Submergence	At least 2 ft of water above the pump at the pumping level
Single phase	3-wire builds need the Grundfos control box for the motor HP, ordered separately; 2-wire builds need none
Three phase	A magnetic starter or drive rated for the motor, ordered separately
Cooling and temperature	Water up to 104°F with at least 0.25 ft/s flowing past a 4 in motor (0.50 ft/s on a 6 in MS6000); drinking water up to 86°F
Sand	50 ppm for SP 5S-25S

Materials of Construction

Part	Material
Impellers and chambers	AISI 304 stainless steel
Valve casing and suction interconnector	Cast stainless steel, EN 1.4308 (standard S construction)
Strainer, straps and cable guard	AISI 304 stainless steel
Pump shaft	Stainless steel, EN 1.4057
Bearings	NBR elastomer
Neck rings	NBR/TPU
Motor	Water-filled Grundfos submersible motor; materials and seal design depend on motor type

Source: Grundfos SP data booklet, standard S construction.

Data Sheet

SP 16S Data Sheet, 60 Hz (Curves, Dimensions, Weights)MS402 and MS4000 4 in Motor Data Sheet, 60 Hz MS6000C and MMS6 6 in Motor Data Sheet, 60 Hz Grundfos SP Submersible Pumps Brochure Grundfos SP Installation and Operating Instructions Grundfos 5S-25S Service Instructions SmartFlo Startup Guide for SP

Your cart is empty

Your cart

Subtotal

$0.00

Grundfos 16S SP Submersible Well Pump

HP - Motor Dia: 1/2 HP - 4 in Motor

Voltage - Phase: 115V 1Ph 2-Wire

Model - Head: 16S05-5 - 112 ft at 16 GPM

Description

Data Sheet

Videos

You May Also Like

Customer Service

Company

Shipping & Returns

Keep in Touch