Description
The Pentair Nocchi DHI 2-70T (code 422-1270) is a horizontal multistage centrifugal pump in AISI 316 stainless steel, for 400v three-phase supply. It delivers up to 60 litres per minute, with 63 metres of head at 10 l/min and 26 metres at 60 l/min, from a 0.78 kW motor drawing 1.8 A. Suction and delivery are 1¼”. The pump weighs 14.1 kg and is 422 mm long.
The 2-70 is the highest-pressure pump in the DHI range, with 63 metres at 10 l/min and 44 metres at 40 l/min. Choose it where head matters more than volume and your demand stays within 60 l/min. If you need the same 44 metres at 40 l/min but also higher flows, the DHI 4-50T carries on to 120 l/min. The DHI 2-60T is the next size down. The DHI 2-70M is the 230v single-phase version.
The pump body, impellers and shaft are AISI 316 stainless steel, the motor housing is die-cast aluminium, and the mechanical seal is carbon on ceramic with EPDM gaskets. The 2-pole motor runs at 2850 rpm, is IP55 rated and has Class F insulation. Suction and delivery are both 1¼” threaded connections, set at 90 degrees to each other. The pump is supplied as a bare pump and motor, without a pressure switch, vessel or controller.
Features
- Highest head in the DHI range: 63 m at 10 l/min
- 0.78 kW motor, 422 mm long, 14.1 kg
- 44 m at 40 l/min, up to 60 l/min
- 400v three-phase motor, 1.8 A
- AISI 316 stainless steel pump body, impellers and shaft
- Rated for clean water up to 90°C
- IP55 motor with Class F insulation, 2850 rpm
- 1¼” suction and delivery at 90 degrees
Applications
- Booster sets for taller buildings with modest flow demand
- High-pressure washing and spray systems
- Hot water transfer up to 90°C
Performance
| Flow (l/min) | 10 | 20 | 30 | 40 | 50 | 60 |
|---|---|---|---|---|---|---|
| Head (m) | 63 | 58 | 52 | 44 | 36 | 26 |
The DHI is for clean water without suspended solids or abrasive material, up to 90°C, with a maximum operating pressure of 6 bar at 90°C. It is not self-priming: fill the casing and suction pipe before starting, and never run it dry. On 400v three-phase it must be wired through an isolator with fuses and a thermal overload relay set to the motor’s running current, as Pentair’s manual requires. For drinking water boosting in the UK, draw from a break tank or cistern rather than connecting straight to the mains supply pipe without your water supplier’s consent.
The Nocchi DHI range
| Model | Supply | Motor output P2 (kW) | Current (A) | Head at 40 l/min (m) | Highest listed head (m) | Max flow (l/min) |
|---|---|---|---|---|---|---|
| DHI 2-40M | 230v single-phase | 0.40 | 3.2 | 27 | 36 | 60 |
| DHI 2-60M | 230v single-phase | 0.60 | 4.1 | 37 | 53 | 60 |
| DHI 2-70M | 230v single-phase | 0.78 | 5.2 | 44 | 63 | 60 |
| DHI 4-30M | 230v single-phase | 0.50 | 3.6 | 27 | 27 | 120 |
| DHI 4-40M | 230v single-phase | 0.70 | 4.4 | 35 | 35 | 120 |
| DHI 4-50M | 230v single-phase | 0.90 | 5.8 | 44 | 44 | 120 |
| DHI 2-40T | 400v three-phase | 0.40 | 1.4 | 27 | 36 | 60 |
| DHI 2-60T | 400v three-phase | 0.60 | 1.8 | 37 | 53 | 60 |
| DHI 2-70T | 400v three-phase | 0.78 | 1.8 | 44 | 63 | 60 |
| DHI 4-30T | 400v three-phase | 0.50 | 1.7 | 27 | 27 | 120 |
| DHI 4-40T | 400v three-phase | 0.70 | 2.0 | 35 | 35 | 120 |
| DHI 4-50T | 400v three-phase | 0.90 | 2.0 | 44 | 44 | 120 |
Figures are from Pentair’s DHI datasheet. See the Nocchi DHI multistage pump range page for help choosing between models and answers to common questions.
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