Name: Grundfos SQ 2-115 96510203
Brand: Grundfos
SKU: 96510203
Price: 1687.67 GBP
Availability: InStock

In stock

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Established 1975
Trusted by thousands of customers

The Grundfos SQ 2-115 (96510203) is a 3″ stainless steel submersible borehole pump for very deep domestic private water supplies, farms and irrigation. It delivers 2 m³/h (about 33 litres/min) at 128 m head from a standard 230V single-phase supply. The 1.85 kW MS3 permanent-magnet motor has built-in dry-running protection, soft start and voltage protection, and the pump fits any borehole from 76 mm (3″) upwards.

2 m³/h

Rated flow at 128 m

155 m

Max. head

1.85 kW

230V single-phase

76 mm

Min. borehole

Dry-run protection
Soft start
Built-in non-return valve
Rp 1¼ outlet
AISI 304 stainless
2-year warranty

Supplied with a 1.5 m motor lead. 3-core drop cable and a cable joint kit are needed to reach the surface. We can size and supply the cable to your borehole depth.

Full Description

More about this product

Full Description

Grundfos SQ 2-115 overview

The SQ 2-115 is the 7-stage top model of the Grundfos SQ 2 family. It uses the largest 1.85 kW MS3 motor and gives up to 155 m of head. It delivers 2 m³/h, a family-home flow, from boreholes where the pumping water level sits around 80–95 m down, or where deep water must then climb steep ground to a property, farm or header tank. Typical jobs are very deep private water supplies in hard-rock and upland areas, farms, holiday lets and irrigation.

Like every SQ, it has the electronics inside the motor. There is no capacitor box or starter, and dry-running, overload, overtemperature and voltage protection are all built in. Wire it to a 230V supply through a pressure switch and pressure vessel, or use an automatic flow controller, and it’s ready to run.

33 l/min

At 128 m head

155 m

Max. head (closed valve)

12.3 A

Rated current

6.3 kg

Net weight

Performance

Head is the total lift the pump must provide: depth to the pumping water level, plus height to the outlet, plus pipe losses, plus the pressure you want, at about 10 m per bar.

Flow (m³/h)	Flow (l/min)	Head (m)	Equivalent pressure
0	0	155	15.5 bar (closed valve)
1.0	16.7	150	15.0 bar
1.5	25.0	142	14.2 bar
2.0	33.3	128	12.8 bar (rated point)
2.5	41.7	108	10.8 bar
3.0	50.0	79	7.9 bar

Worked example: pumping water level 85 m, plus a 12 m rise to the plant room, plus about 6 m of pipe losses, plus 2.5 bar (25 m) at the vessel, gives 128 m. That puts the SQ 2-115 on its rated point at about 2 m³/h. If your water level is shallower, the SQ 2-100 may be enough on the smaller motor. If you need 2 m³/h from deeper still, ask us about a 4″ Grundfos SP.

Key features

Dry-running protection

The motor monitors its own power draw. It allows 40 seconds after switch-on for priming, cuts out if the borehole runs dry, then restarts itself within 5 minutes once water has recovered.

Soft start

A smooth ramp-up of about 2 seconds keeps start current low, reduces water hammer and wear, and lets the pump run from a generator. Grundfos recommends sizing the generator 50% above the pump’s power.

Wide voltage tolerance

Over- and under-voltage protection keeps the motor safe on weak rural supplies and long cable runs. It stops below 150V or above 315V instead of burning out.

Built for real boreholes

Floating impellers with tungsten carbide/ceramic bearings tolerate sand up to 50 g/m³. A spring-loaded non-return valve is built into the pump top.

Stainless steel construction

Pump sleeve and motor are EN 1.4301 (AISI 304) stainless steel with glass-reinforced polyamide hydraulics, for a long life in clean groundwater (pH 5–9).

Overload and overtemperature

The electronics protect against motor overload, high internal temperature and upthrust at start-up, with no external control box needed.

Technical specification

Model / part number	Grundfos SQ 2-115 / 96510203
Rated flow / head	2 m³/h at 128 m
Max. head	155 m
Stages	7
Motor	Grundfos MS3 permanent-magnet, 1.85 kW (P2)
Supply	1 × 200–240V, 50 Hz
Power input (P1) / rated current	2.54 kW / 12.3 A
Speed	10,700 rpm
Enclosure / insulation class	IP68 / F
Outlet	Rp 1¼ female
Min. borehole diameter	76 mm (3″)
Overall length	888 mm
Net weight	6.3 kg
Max. liquid temperature	35 °C
Max. sand content	50 g/m³
Materials	Stainless steel EN 1.4301 (AISI 304), polyamide impellers
Non-return valve	Built in
Motor lead	1.5 m (3-core drop cable required)
Warranty	2 years

Installation notes

Hang the pump below the lowest expected pumping water level. It must be fully submerged before it is switched on.
Use 3-core submersible drop cable. Grundfos SQ/SQE motors do not take a 4-core cable. Join it to the motor lead with a heat-shrink cable joint kit.
At 12.3 A over a cable run of 100 m or more, cable size matters. Undersized cable means voltage drop and nuisance cut-outs. Ask us and we’ll confirm the cross-section for your depth.
Water must flow past the motor to cool it. In wide wells or tanks, fit a cooling sleeve.
The column can hold up to 15.5 bar against a closed valve, so use rising main and fittings rated for it, plus a pressure relief valve or pressure-reducing valve ahead of the house system.

Want constant pressure at the taps? The Grundfos SQE 2-115 (96510155) uses the same pump end with an MSE3 motor. Add a CU 301 constant pressure package and it varies speed to hold steady pressure instead of cycling on and off.

Grundfos SQ 2-115 FAQs

How much water does the Grundfos SQ 2-115 pump?

About 2 m³/h (33 litres/min) at 128 m of total head, and up to 50 litres/min at 79 m. It stops delivering at 155 m.

What’s the difference between the SQ 2-100 and SQ 2-115?

The SQ 2-115 adds a seventh stage and moves up from the 1.55 kW to the 1.85 kW motor. That gives about 23 m more head (155 m max against 132 m) for deeper boreholes. Both fit the same 76 mm bore.

Does it need a control box?

No. Soft start, dry-running, voltage, overload and overtemperature protection are built into the motor. A pressure switch with vessel, or a flow controller, is all that’s needed to run it automatically.

What happens if my borehole runs dry?

The SQ senses the drop in power when there is no water, stops itself, and tries again automatically within 5 minutes. That protects both the pump and the borehole.

What cable does it need?

A 3-core submersible drop cable (live, neutral, earth) from the 1.5 m motor lead to the surface, joined with a heat-shrink joint kit. At this current and depth the cable size matters, so we’ll confirm it for your run length.

Can it run from a generator?

Yes. The soft start keeps start current low. Grundfos recommends a generator rated at least 50% above the pump’s power input, so around 4 kVA or more for the SQ 2-115.

Additional Information

Downloads

Data Sheet PDF
Download

Delivery Information

Standard delivery:
Standard delivery is free on most orders. Some items may incur a delivery charge depending on weight, size or value. Any applicable charge will be displayed at checkout.

Deliveries will typically be made between 7am and 6pm, Monday to Friday (excluding public holidays).

Next day delivery:
Next working day delivery is available for a £16.50 + VAT delivery charge.

Orders must be placed before 12 noon to qualify for next working day delivery. Orders placed after 12 noon on Thursday but before noon on Friday will be delivered the following Monday. Orders placed after 12 noon on Friday will be delivered on Tuesday.

Pallet/Large/Difficult items:
Some large, heavy or difficult to transport items may incur an additional delivery charge. Please contact us for a delivery quote before ordering.

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