Key features
Both frames stand 352 mm tall. The BEST 3 runs a 120 mm impeller against the BEST 2's 112 mm and lifts to 14.6 m rather than 13.1 m, for 0.7 kg more weight.
Silicon carbide and NBR on the pump side, carbon, ceramic and NBR on the motor side, separated by 180 cc of white mineral oil. Two seals in series, not one seal and a lip.
Casing, impeller, casing cover, seal cover, strainer and motor support are AISI 304 (EN 1.4301). The shaft is AISI 303 (EN 1.4305) on its wet extension.
Ebara rates the range for clean and dirty water with suspended particles up to 10 mm. That covers seepage, site drainage and flooded plant rooms.
The three-phase build is BEST 3, the single-phase BEST 3M, and BEST 3M A adds the float switch. Ebara lists the float as a single-phase option.
Certificate Z1A 015912 0052 covers the BEST/A 3, BEST/A 3M and BEST/A 3M A builds against the EN 60335 electrical safety standards.
About the Ebara BEST 3
The Ebara BEST 3 is a portable stainless steel sump pump for clean and dirty water. Ebara puts the range on seepage water, on emptying basements, garages and cellars, and on draining small and medium-sized construction sites. It is built entirely in AISI 304 with a double mechanical seal, which is what separates it from a pressed-steel builder's pump on a site that will run it every week for a year.
Get the frame right first. Ebara publishes BEST 2-5 as one range, and the figures on its own product page cover all four sizes together, 1.2–21.6 m³/h and 2.9–18.4 m of head. Those are not the BEST 3's numbers. The BEST 3 is the 0.75 kW frame, second from the bottom, and its own curve stops at 16.8 m³/h and 14.6 m. BEST 2 is 0.55 kW, BEST 4 is 1.1 kW and BEST 5 is 1.5 kW and three-phase only. Size against the range headline, order a BEST 3, and you will be short of head.
The reason to pay for a BEST 3 over a BEST 2 is that the extra head costs you no space. It is 352 mm tall and 12.7 kg, the same height as a BEST 2 and 0.7 kg heavier, but it lifts 1.5 m further. Step up again to a BEST 4 and the pump grows to 377 mm. In a shallow chamber or a narrow inspection cover, those 25 mm decide whether the pump goes in at all, so the BEST 3 is usually the right answer when the duty has outgrown a BEST 2 but the sump has not grown with it. Measure the chamber before you settle the frame.
The other figure to read carefully is temperature. The BEST 2-5 range is rated to +35°C. Ebara's own BEST ONE, a third of the power at 0.25 kW, takes +50°C, so the bigger pump here is the one with the tighter temperature limit. Warm process water, boiler blowdown or anything coming off a wash plant will take you past it. Tell us the liquid temperature and we will check it before you buy.
A 10 mm solids passage is what it says. Suspended particles up to 10 mm go through the impeller. Rag, wipes and fibre will still wrap it, because an open centrifugal impeller has no cutter and nothing to clear itself with. If the sump takes anything off a WC or a macerator, this is the wrong pump and we will tell you so rather than sell you one.
How the Ebara BEST 3 works
The BEST 3 pulls water through a stainless strainer in the base, throws it out through an open centrifugal impeller of 120 mm diameter, and discharges through a G 1½ connection to UNI ISO 228. The motor is a submersible dry type, two pole, running at about 2,800 rpm at 50 Hz and rated 0.75 kW. Ebara measures the curves to ISO 9906:2012 Grade 3B with clean water at 20°C and a kinematic viscosity of 1 cSt.
Two seals and an oil chamber
The shaft passes through two mechanical seals with an oil chamber between them. The pump-side seal uses silicon carbide with NBR elastomers, the motor-side seal carbon and ceramic with NBR. Between them sits 180 cc of white mineral oil, Esso Marcol 172, which lubricates and cools both sets of faces.
That is a genuine double seal, and it matters in a sump full of grit. If the pump-side face wears, the oil chamber gives you a second barrier before water reaches the windings, and oil in the chamber going milky is the early warning you get before a motor failure. Run the pump dry and you lose the lubricating film on the faces, which is the fastest way to kill it.
Reading the type key
Ebara's own worked example in the data book is BEST 3 M A. The model number gives the frame, 2 to 5. M means single phase only, and A means the pump is supplied with a float switch. So a BEST 3 M A is a single-phase 0.75 kW pump with a float, and a plain BEST 3 is the three-phase build. If you are matching an existing unit, send us that designation and the serial number off the nameplate.
Electrical side
The single-phase build runs on 1230 V ±10% and draws 5.6 A at full load, with a
20 µF 450 V capacitor and overload protection built into the motor. The
three-phase build runs on 3400 V ±10% and draws 2.4 A. Input power is 1.3 kW
single-phase and 1.2 kW three-phase, which is the figure to size the supply
against rather than the 0.75 kW shaft rating.
Both builds ship with 10 m of H07RN-F cable. The single-phase BEST 3 takes 3G1.5, a step up from the 3G1 on a BEST 2, and the three-phase takes 4G1. Maximum immersion is 7 m on that cable.
Certification
TÜV SÜD Product Service GmbH issued GS mark certificate Z1A 015912 0052 to Ebara Pumps Europe S.p.A. for the range. The certificate lists the BEST 3 builds as BEST/A 3, BEST/A 3M and BEST/A 3M A, tested to EN 60335-1:2012/A15:2021, EN 60335-2-41:2021/A11:2021, EN 62233:2008 and AfPS GS 2019:01 PAK. It runs to 6 February 2029. The motor is IP68 with class F insulation.
Specifications
| Type | Submersible sump pump, portable or fixed installation | |
|---|---|---|
| Liquid handled | Clean or dirty water | |
| Flow rate | up to 16.8 m³/h | BEST 3 frame; the BEST 2-5 range covers 1.2–21.6 m³/h |
| Total head | 3.2–14.6 m | BEST 3 frame; the BEST 2-5 range covers 2.9–18.4 m |
| Maximum solids passage | 10 mm | suspended particles |
| Liquid temperature | up to +35°C | |
| Maximum immersion | 7 m | with the 10 m cable |
| Impeller | Open centrifugal | |
| Impeller diameter | 120 mm | |
| Power rating | 0.75 kW (1 HP) | |
| Input power | 1.3 kW single-phase; 1.2 kW three-phase | |
| Speed | approx. 2,800 rpm | 2-pole, 50 Hz |
| Voltage | 1~230 V ±10%; 3~400 V ±10% | |
| Full load current | 5.6 A single-phase; 2.4 A three-phase | |
| Capacitor | 20 µF, 450 V | single-phase build only |
| Discharge connection | G 1½ to UNI ISO 228 | |
| Suction | Strainer | |
| Casing | AISI 304 (EN 1.4301) | |
| Impeller material | AISI 304 (EN 1.4301) | |
| Casing cover and seal cover | AISI 304 (EN 1.4301) | |
| Shaft | AISI 303 (EN 1.4305), wet extension | |
| Shaft seal | Double mechanical seal; silicon carbide and NBR pump side, carbon, ceramic and NBR motor side | |
| Lubricating oil | White mineral oil, Esso Marcol 172, 180 cc | |
| Bearings | Sealed ball bearings, 6203 ZZ pump side and 6202 ZZ fan side | |
| Protection degree | IP68 | |
| Insulation class | F | |
| Power cable | 10 m H07RN-F | 3G1.5 single-phase; 4G1 three-phase |
| Float switch | Optional on the single-phase build | |
| Height | 352 mm | |
| Weight | 12.7 kg | unpackaged |
| Test standard | ISO 9906:2012 Grade 3B | |
| Certification | TÜV SÜD GS mark, certificate Z1A 015912 0052, valid to 6 February 2029 |
Send us the flow, the total dynamic head, what the water is carrying and its temperature, and we will tell you whether the BEST 3 covers it or whether the duty wants a larger frame. Replacing an existing pump? Photograph the nameplate and send the full designation and serial number.
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Frequently asked
What flow and head does the Ebara BEST 3 give?
Up to 16.8 m³/h, at heads from 14.6 m down to 3.2 m. The wider 1.2–21.6 m³/h and 2.9–18.4 m figures Ebara publishes belong to the whole BEST 2-5 range, not to the BEST 3 on its own.
What is the difference between the Ebara BEST 2 and BEST 3?
Motor rating and impeller. The BEST 3 is 0.75 kW with a 120 mm impeller and reaches 14.6 m; the BEST 2 is 0.55 kW with a 112 mm impeller and reaches 13.1 m. Both stand 352 mm tall, and the BEST 3 weighs 0.7 kg more.
Should I fit an Ebara BEST 3 or a BEST 4?
Take the BEST 4 if you need more than 14.6 m of head or more than 16.8 m³/h. Take the BEST 3 if the chamber is tight, because the BEST 4 is 377 mm tall against the BEST 3's 352 mm.
Can the Ebara BEST 3 handle sewage or rag?
No. Ebara rates it for clean and dirty water with suspended particles up to 10 mm, and the open centrifugal impeller has no cutter, so wipes and fibre will wrap it. Specify a wastewater or grinder pump for anything off a WC.
What temperature can an Ebara BEST 3 run at?
Up to +35°C. Ebara's BEST ONE takes +50°C, so check the liquid temperature before you specify a BEST 3 for process or wash-down water.
How deep can an Ebara BEST 3 be submerged?
7 m, on the 10 m power cable Ebara supplies as standard. The motor is IP68 with class F insulation.
What size is the discharge on an Ebara BEST 3?
G 1½ to UNI ISO 228. The pump is 352 mm tall and weighs 12.7 kg unpackaged.
What does the M or A mean on an Ebara BEST 3M A?
M marks the single-phase build and A means it comes with a float switch. A plain BEST 3 with no letters is the three-phase version.
What current does an Ebara BEST 3 draw?
5.6 A at full load on the single-phase 230 V build and 2.4 A on the three-phase 400 V build. Input power is 1.3 kW and 1.2 kW respectively.