Ebara EVMS-K Pumps
Ebara EVMS-K3 11N5 Q1BEG E/1.1 MT Multistage Pump 28251000115
- Established 1975
- Trusted by thousands of customers
The Ebara EVMS-K3 11N5 Q1BEG E/1.1 MT is an 11-stage AISI 304 stainless steel vertical multistage pump with a 1.1 kW IE3 motor, an on-board E-SPD+ variable speed inverter and a pressure transducer. It runs from a standard 230 V single-phase supply, holds a constant set pressure as demand changes and delivers high head at low flow, making it a compact, ready-to-wire choice for high-pressure boosting on sites without three-phase power.
Supplied with G1″ oval flange connections, a Q1BEG cartridge seal rated to 16 bar and EPDM elastomers, for a 230 V single-phase supply.
E-SPD+ inverter
AISI 304 stainless
Oval flange G1″
IP55
26.8 kg
More about this product
Ebara EVMS-K3 11N5 Q1BEG E/1.1 MT Overview
The EVMS-K3 11N5 MT is an 11-stage, 1.1 kW single-phase model in the EVMS-K3 range, Ebara’s 3 m³/h nominal-flow vertical multistage pump supplied complete with inverter control. The E-SPD+ MT unit is mounted on the motor terminal box and takes a 230 V single-phase supply, converting it to a 230 V three-phase output for the motor. The pressure transducer comes electrically connected. The inverter starts, stops and modulates motor speed to hold the set pressure, giving steadier supply, lower energy use and longer service life than fixed-speed operation.
Hydraulic parts are EN 1.4301 (AISI 304) stainless steel, with a tungsten carbide shaft sleeve bearing and a Q1BEG cartridge mechanical seal. A 1.1 kW IE3 two-pole motor drives it, and the G1″ oval flange inlet and outlet sit in-line at the base for straightforward pipework. With around 81 m of head at shut-off and flows up to 4.5 m³/h, it suits high-head, low-flow duties such as high-rise building boosting, high-pressure washing and process supply, and long or elevated supply runs, on sites where three-phase power isn’t available.
Key Features
Technical Specifications
| Specification | Value |
|---|---|
| Ebara part number | 28251000115 |
| Pump model | EVMS-K3 11N5 Q1BEG E/1.1 MT |
| Pump type | Vertical multistage, 11 stages, 2-pole |
| Nominal flow | 3 m³/h |
| Maximum flow | approx. 4.5 m³/h (75 l/min) |
| Maximum head | approx. 81 m |
| Maximum working pressure | 16 bar (Q1BEG seal rating) |
| Liquid temperature | -30°C to +120°C (Q1BEG seal rating) |
| Ambient temperature | -10°C to +40°C (up to 1000 m altitude) |
| Connections | Oval flange (N), G1″; drain / vent G3/8″ |
| Motor | Ebara ETM 3 71-1,1-2, 1.1 kW (1.5 HP), IE3, 2830 rpm |
| Motor full load current | 4.3 A at 230 V (three-phase output from inverter) |
| Protection / insulation | IP55 / Class F, no PTC sensor (fitted from 1.5 kW only) |
| Supply | 230 V single phase, 50 Hz (E-SPD+ MT) |
| Height (H / Hi) | 693 mm / 677 mm |
| Weight | 26.8 kg |
Performance
Approximate duty points at 50 Hz (full speed), read from the Ebara EVMS(.)-K3 11/1.1 curve (ISO 9906:2012 Grade 3B). The inverter reduces speed to hold the set pressure at lower demand.
| Flow (m³/h) | 0 | 1 | 2 | 3 | 4 | 4.5 |
|---|---|---|---|---|---|---|
| Flow (l/min) | 0 | 17 | 33 | 50 | 67 | 75 |
| Head (m) | 81 | 78 | 74 | 67 | 54 | 47 |
Materials
| Component | Material |
|---|---|
| Impellers, intermediate casings | EN 1.4301 (AISI 304) |
| Bottom casing, casing cover, outer casing | EN 1.4301 (AISI 304) |
| Liner ring | EN 1.4301 (AISI 304) + PPS |
| Shaft | EN 1.4301 (AISI 304) |
| Shaft sleeve bearing | Tungsten carbide |
| Mechanical seal (Q1BEG) | Unbalanced cartridge, SiC / carbon / EPDM, AISI 316 spring |
| O-rings | EPDM |
| Motor bracket | Cast iron |
| Base / coupling | Die-cast aluminium |
| Tie rods | Galvanised steel, class 6.8 |
E-SPD+ MT Inverter
| Specification | Value |
|---|---|
| Input / output | 230 V single phase / 230 V three phase |
| Maximum pump power | 2.2 kW |
| Max current in / out | 20 A / 11 A |
| Output frequency | 50–60 Hz |
| Pressure setpoint | 0.5–25 bar |
| Protection degree | IP55 |
| Ambient temperature | -10°C to +40°C |
| Multi-pump | 2–3 pump pressurisation units |
| Weight | 2.7 kg |
| Directives | 2014/35/EU (LVD), 2014/30/EU (EMC), 2011/65/EU (RoHS II) |
Installation Notes
Frequently Asked Questions
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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Frequently Asked Questions
Quick answers to common questions about the Ebara EVMS-K3 11N5 Q1BEG E/1.1 MT Multistage Pump 28251000115. For technical specifications, see the product details above; for sizing or installation advice, contact our team. If you have any other questions, we're happy to help.
What is a water booster pump?
A water booster pump increases the pressure of an existing water supply to give stronger flow at taps, showers and appliances. It can be a small inline pump fitted to the incoming mains, or a larger pump and tank set that draws from a break tank to feed the whole house. Boosters do not create water – they raise the pressure of the water already coming in.
What is the difference between an inline booster and a tank-and-pump booster?
An inline booster connects straight onto the incoming mains and is limited to 12 litres per minute under UK water regulations – examples include the Salamander HomeBoost and WaterBoost WB-Compact. A tank-and-pump booster, such as the Grundfos Home Booster or DAB Esybox with Esytank, draws from a break tank and can deliver much higher flow rates for larger homes with multiple bathrooms.
What is a variable speed booster pump?
A variable speed booster uses an inverter to adjust pump speed in real time to match demand. It maintains constant pressure as outlets open and close, runs more quietly than a fixed-speed pump and typically saves up to 50 per cent of the energy a fixed-speed equivalent would use. The DAB Esybox, DAB Esybox Mini 3 and Grundfos Scala2 are common variable speed examples.