Pentair Nocchi Multi Evo-A Booster Pump
The Pentair Nocchi Multi Evo-A booster set is a complete, pre-wired multistage booster pump for homes and small buildings that need strong pressure at several outlets at the same time. Each set combines a self-priming Multi EVO-A 5-50 M pump with a pressure switch, a 6 bar gauge, a five-way brass manifold and a horizontal pressure vessel, ready to connect to a break tank and a 230v single-phase supply.
Multistage means the water passes through several impellers in turn, each one adding pressure. That is why this set holds its pressure far better than a single-stage jet pump as demand rises. Pentair’s published figures give 48.5 metres of head at 40 litres per minute, 31 metres at 80 l/min, and a maximum flow of 120 l/min. The pump body and hydraulic shaft are AISI 304 stainless steel, the impellers and diffusers are glass-reinforced technopolymer, and the 0.95 kW motor (6.2 A) is IP55 rated with thermal protection built into the winding.
Multi Evo-A 5-50M or 5-50M+?
Both sets use the same 5-50 M pump, so flow and pressure are identical. The difference is the pressure vessel. The 5-50M has the compact vessel and is the one to choose where floor space in the plant room, garage or utility room is tight. The 5-50M+ carries a much larger vessel that stores more pressurised water between pump starts. Small draws, such as a basin tap or a toilet cistern refilling, are then met from the vessel without starting the pump, which is easier on the motor and the pressure switch in a busy household or small commercial building.
Pentair sets the pressure switch to cut in at about 2 bar and cut out at about 3 bar. At 3 bar (roughly 30 metres of head at the pump) the 5-50 M still delivers around 80 l/min, so the set can run two or three showers and taps together without the pressure falling away.
When a single-stage set is enough
If you only need better pressure at one or two outlets, the single-stage Pentair Superinox 60/50 and 90/50 booster sets are smaller and lighter. Choose the Multi Evo-A when you need high flow and full pressure together.
| Model | Vessel | Motor (kW) | Current (A) | Head at 20 l/min (m) | Head at 40 l/min (m) | Head at 80 l/min (m) | Max Flow (l/min) | Connections |
|---|---|---|---|---|---|---|---|---|
| Multi Evo-A 5-50M | Compact | 0.95 | 6.2 | 56 | 48.5 | 31 | 120 | 1″ in and out |
| Multi Evo-A 5-50M+ | Large | 0.95 | 6.2 | 56 | 48.5 | 31 | 120 | 1″ in and out |
Head figures are Pentair’s published performance for the Multi EVO-A 5-50 M pump on 230v single-phase supply; at 120 l/min the head falls to 10 metres. Click through to either model for its full specification.
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120 l/min · 56 m · 230v
This product has now been discontinued. Get in touch with us and we can advise you on the best ...Read More120 l/min · 56 m · 230v
This product has now been discontinued. Get in touch with us and we can advise you on the best ...Read More
Where to Use a Multi Evo-A Booster Set
The Multi Evo-A is a whole-house booster for larger family homes with several bathrooms, small guest houses and holiday lets, and offices or workshops where washrooms and kitchens are in use together. Because the pump is multistage, it keeps pressure up while several outlets are open, which is where a single-stage booster starts to fade. Pentair also lists washing systems, irrigation and rainwater reuse among its uses.
Install it on a level base in a dry, frost-free plant room, garage or utility room, with isolation valves on both sides for servicing. Size the set on the flow you need at the pressure you want, not on maximum figures alone; our guide to pump head and flow rate explains how to read the performance table, and how to choose the right booster pump walks through sizing for a property.
For a smaller house or a single bathroom, the Pentair Superinox sets are the simpler option, and the cast iron Pentair Waterpress 70/50 is another single-stage alternative. If you want to build your own set around a bare multistage pump, see the Nocchi DHI multistage pumps.
Frequently Asked Questions
What is a multistage booster pump and why choose one?
A multistage pump has several impellers on one shaft, and the water gains pressure at each stage. The result is a flatter performance curve: the Multi EVO-A 5-50 M gives 56 metres at 20 l/min and still 31 metres at 80 l/min. A single-stage pump of similar size loses pressure faster as more taps open.
How much larger is the vessel on the 5-50M+?
The 5-50M+ uses a much larger pressure vessel than the compact 5-50M; the pump, pressure switch and performance are the same. A bigger vessel means fewer pump starts for small draws. Please call us for the vessel volume and dimensions of the version currently supplied, and check them against your space before you order.
Can a Multi Evo-A be connected directly to the mains?
Not without the water supplier’s consent. Under the Water Supply (Water Fittings) Regulations 1999, a booster pump should not be connected directly to a mains supply pipe without a break tank or an approved backflow arrangement, so in practice the set draws from a cold water tank. Our guide on how to increase water pressure covers the options.
Is the Multi Evo-A suitable for drinking water?
Pentair certifies the Multi EVO-A range for use with drinking water under the French ACS scheme. We have not found a WRAS approval listing for these sets, so if your project specifies WRAS-approved fittings, call us before ordering and we will check with the supplier.
Can the pump sit above the water tank?
Yes. The Multi EVO-A is self-priming, and Pentair quotes a maximum suction lift of 8 metres when the pump is installed correctly, though a tank at or above pump level is still the most reliable arrangement. Fill the pump casing with water before the first start.
What water temperature and quality can it handle?
Clean water without suspended solids or abrasive material, up to 50°C, with a maximum operating pressure of 8 bar. It must never run dry, so protect it from a break tank running empty with a level control; our pump controls range includes float switches for this.
For help choosing a Multi Evo-A set, call the AES Rewinds team on 01252 515169 or email sales@aesrewinds.com. You can also browse all booster pumps.
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