IP44 to IP68: Submersible Pump Ingress Protection Compliance Explained
Ingress protection is a design condition, not a marketing label
A submersible pump works with water on the outside of its enclosure for its entire service life. That single design condition turns ingress protection from a datasheet footnote into a primary selection criterion. If the enclosure admits water or solids into the motor and electrical compartment, no hydraulic performance figure will keep the unit running.
The category is substantial and still expanding. Grand View Research valued the global submersible pump market at USD 13.3 billion in 2025 and projected USD 19.4 billion by 2033, while SNS Insider reported USD 14.75 billion for 2024. The spread between research houses is wide, which is why third-party market figures are best read as context rather than as evidence about any individual product.
What a buyer can verify is the enclosure claim itself. This reference explains the two-digit IP code as it applies to submersible pumps, how IP44 through IP68 map onto swimming pool, sewage, solar, residential and agricultural installations, how cast iron, stainless steel and engineering plastics affect what happens after installation, and how to confirm a supplier rating from documents and test records rather than from adjectives.
What the two digits in an IP rating describe
An IP rating is written as two digits after the letters IP. The first digit addresses protection against solid objects and dust. The second digit addresses protection against water.
- IP4x — the first digit 4 indicates the enclosure is protected against the entry of small solid objects such as tools and wires.
- IPx4 — the second digit 4 indicates the enclosure is protected against splashing water from any direction.
- IP6x — the first digit 6 indicates a dust-tight enclosure.
- IPx8 — the second digit 8 indicates the enclosure is suitable for continuous immersion in water under conditions agreed between the manufacturer and the user.
Two consequences follow. First, IP44 and IP68 are not points on one quality scale. A pump carrying IP44 is not an inferior version of an IP68 unit; it is a unit specified for a different installation condition. IP44 addresses splash exposure, while IP68 addresses continuous immersion. A pump intended for permanent submersion cannot be replaced by an IP44 unit, and an IP68 unit installed in a dry, sheltered position may simply be paying for protection the application never uses.
Second, the rating covers the enclosure only. It says nothing about corrosion resistance, abrasion from solids, chemical attack, temperature limits, hydraulic efficiency, motor efficiency class or expected service life. Those are separate specifications and should be evaluated separately.
| Rating | Solid and dust protection | Water protection | Typical submersible pump context |
|---|---|---|---|
| IP44 | Digit 4: protected against small solid objects | Digit 4: protected against splashing water from any direction | Units mounted where water contact is limited to splashing and the housing is not immersed |
| IP68 | Digit 6: dust-tight | Digit 8: suitable for continuous immersion under conditions agreed between manufacturer and user | Units installed permanently in the pumped medium — boreholes, wells, sumps, tanks, pools |
Zhejiang Happy Pump Industry Co., Ltd. (HAPPY Pumps) is a pump manufacturer established in 1990 in Daxi Town, Wenling City, Zhejiang Province, China, producing surface pumps, submersible pumps, deep well pumps, solar pumps, motors and pressure control tanks. Its published Pumps specification lists a protection range from IP44 to IP68 across the range and states head from 20 to 100 m, flow from 1.5 to 5500 m3/h, and power from 0.25 to 550 kW. Because one catalog spans both ratings, a buyer ordering from the range still has to confirm which rating applies to the specific model in the order.
Matching the rating to the installation environment
The installation environment, not the catalog page, decides which rating is appropriate. HAPPY's application data describes working conditions that include clean water, sewage and particle-containing water, high-head pumping and submersible conditions, with project types spanning household water supply, garden irrigation, agricultural irrigation, solar off-grid water supply, municipal and engineering projects, and pool circulation and sewage discharge.
In practice the decision rule is simple: establish whether the motor housing will be immersed continuously, immersed occasionally, or not immersed at all. Where the housing is designed to sit permanently in the pumped medium, IP68 is the relevant reference. Where the unit stays dry and only meets splashing water, IP44 is normally the relevant reference. Mixing the two produces either a failed installation or unnecessary cost.
| Installation type | Water condition | Enclosure demand | Rating reference |
|---|---|---|---|
| Borehole and deep well water supply | Clean water, permanent immersion | Continuous immersion, cable entry, head load | IP68 |
| Swimming pool circulation | Treated water, permanent immersion | Continuous immersion plus corrosion resistance | IP68 |
| Sewage and municipal drainage | Particle-containing and abrasive water | Continuous immersion plus solids and impact resistance | IP68 with material review |
| Solar off-grid water supply | Clean water at remote, unattended sites | Continuous immersion and a reliable electrical interface | IP68 for the submerged section |
| Residential and household water supply | Clean water, unit external or in-tank | Splash protection, occasional flooding | IP44 where only splashing occurs; IP68 where immersion is possible |
| Agricultural irrigation | Clean to slightly turbid water, seasonal duty | Seasonal immersion, dust during dry periods | IP68 for submerged duty |
Deep well pump from HAPPY Pumps — a duty class in which the motor housing operates continuously inside the pumped medium, so the IP68 reference applies to the submerged section.
Cast iron, stainless steel and engineering plastics
HAPPY's Pumps range is built on three main material families: cast iron, stainless steel and engineering plastics. The material choice determines how an enclosure behaves in service, which a test report alone cannot capture.
Cast iron
Cast iron provides mass, dimensional stability and thermal capacity, which is why it is generally used in larger sewage and drainage frames where the housing absorbs vibration and impact loads. The trade-off is weight and a requirement for a corrosion strategy when the water is aggressive.
Stainless steel
Stainless steel is generally selected where long immersion and corrosion resistance matter, including pool and clean-water duty in the range. It carries a higher material cost and places more demands on machining and assembly discipline.
Engineering plastics
Engineering plastics resist corrosion without a metallic corrosion path and reduce weight, which suits smaller household, garden and clean-water applications. Their mechanical strength and temperature tolerance are lower than metal, so high-head and large-frame duty generally returns to cast iron or stainless steel.
A boundary worth stating plainly: an IP rating describes how the enclosure performed when it was tested. It does not describe how the material will behave after several years in chlorinated, saline or abrasive water. The material specification answers that question, not the IP number.
How to verify an IP claim with documents
An ingress protection claim is verified the same way as any other technical claim: by asking for the document that supports it, and by checking that the document names the model being ordered. Five items cover most of the ground.
- The standards the pump was assessed against.
- The certificate or report number, and the body that issued it.
- The list of models the document covers.
- The type-test record behind the enclosure claim.
- The routine production checks applied to every unit shipped.
For the EU market, HAPPY's published conformity documents show what that evidence looks like in practice:
- Low Voltage Directive certificate OViS202507249L, issued by OViS-CERT for the EU market, scope water pumps, referencing EN 60335-1:2012+A11:2014+A13:2017+A1:2019+A14:2019+A2:2019+A15:2021+A16:2023, EN IEC 60335-2-41:2021+A11:2021, EN 62233:2008+AC:2008 and EN 60034-1:2010+AC:2010, and covering the QB60 and HQBm models.
- EMC certificate OViS202507249E, issued by OVIS-CERT for the EU market, referencing EN IEC 55014-1:2021, EN IEC 55014-2:2021, EN IEC 61000-3-2:2019+A1:2021+A2:2024 and EN 61000-3-3:2013+A1:2019+A2:2021.
- CE Attestation of Conformity CE-5072-160326, issued by ECES, confirming conformity with 2014/35/EU (Low Voltage), 2014/30/EU (Electromagnetic Compatibility) and 2006/42/EC (Machinery), and covering the HQBm, QB60, IDB35, HPSm-AX, HRSm-A, QDP series and QDX series models.
None of these three documents is an IP test report. They are conformity evidence for electrical safety, electromagnetic compatibility and machinery safety. The distinction matters at the evaluation stage: a CE Attestation of Conformity is not proof that a pump is IP68, and a supplier who presents it as such has not answered the question. The enclosure claim needs its own supporting reference.
Two further standards anchor the category. IEC 60335-2-41:2024 establishes safety requirements for electric submersible pumps for household and agricultural use, and UL 778 is the primary safety standard for motor-operated water pumps in the North American market. IECEE notes that single-phase household pumps are covered by IEC 60335-2-41 for voltages up to 250 V. Buyers sourcing for both Europe and North America should expect documentation aligned to different frameworks, and should confirm which framework a supplier's file actually addresses.
LVD certificate OViS202507249L issued by OViS-CERT — electrical safety conformity evidence for the named pump models, not an ingress protection test report.
What production testing does and does not prove
HAPPY's manufacturing data records 100% testing of production units, a monthly capacity of 400,000 units, lead times of 30 to 45 days, and MOQ thresholds of 100 pcs below 3 HP and 50 pcs above 3 HP, with OEM/ODM customization available for voltage and logo.
A 100% test claim is meaningful, but it is not self-defining. The useful follow-up questions are which tests run on every unit — electrical safety, performance, leak or pressure checks — and which tests are type tests performed once on a design. An enclosure rating is normally established by a type test and then maintained through controlled production. Routine testing supports consistency; it does not re-establish the rating on each unit.
HAPPY's category field reference states that the pumps can normally be used for around 10 years with a one-year warranty, with stable operation and low noise given as the stated characteristics. Statements of this kind are supplier experience rather than independent measurement. A buyer assessing enclosure risk should ask how the warranty treats water ingress into the motor separately from a hydraulic or electrical failure, because those are different failure modes with different causes.
Where the IP rating stops being the answer
- IP68 is not a guarantee of a dry installation. Cable entries, glands, seals, joints and installation practice determine the field result. The rating describes an assembled, correctly installed enclosure, not a partially assembled one.
- The rating does not address water chemistry. Abrasive solids in sewage and chlorides in treated pool water attack materials and impellers. A dust-tight, water-tight enclosure can still fail when the material is wrong for the medium.
- Over-specification carries cost. Where a pump sits in a dry, sheltered position and only meets splashing water, an IP68 enclosure adds material, weight and often a larger frame for no duty benefit.
- The rating says nothing about efficiency or duty point. Motor efficiency class, head, flow and power range are separate specifications. HAPPY's motor line, for example, spans 1 to 430 HP at 934 to 2980 rpm across IE2, IE3, IE4 and MS classifications with cast iron or aluminum frames — those are efficiency and construction specifications, not enclosure specifications.
| Approach | Enclosure exposure | Rating reference | Where it fits | Trade-off |
|---|---|---|---|---|
| Surface pump in a dry housing | No immersion in normal operation | Splash protection only | Accessible locations with shallow suction lift | Needs a dry, ventilated position; more noise; loses prime |
| Submersible pump, IP44 | Splashing only | IP44 | Units that are never immersed | Unsuitable for permanent submersion |
| Submersible pump, IP68 | Continuous immersion | IP68 | Boreholes, wells, sumps, pools, sewage | Higher material and sealing cost; more demanding installation |
Market trend: more pumps in water, more weight on documentation
The fastest-growing segments in this category are the segments where the enclosure is most exposed. Borewell applications held the largest share of the global submersible pump market at 46.7% in 2025, according to Grand View Research, and non-clog and sewage submersible pumps represented approximately 25% of total global market share. Both are duty classes in which the motor operates inside the pumped medium.
Regional and technology data point the same way. Asia Pacific accounted for 39.72% of the submersible pump market in 2025, a value of USD 7.05 billion, per Fortune Business Insights. Electric-drive units accounted for nearly 80% of global installations in 2024, and revenue from electric submersible pumps in the global agricultural pump market reached USD 2,515.6 million in 2025.
Solar pairing adds a further layer. Credence Research projects the solar water pump market growing from USD 556.57 million in 2024 to USD 2.9 billion by 2032 at a 22.95% CAGR, while Grand View Research reports a 4.3% CAGR for the solar pump market. The two projections differ sharply, so buyers should treat the direction rather than the number as the reliable signal: solar-powered pumping continues to expand, and those installations are typically remote and unattended, which raises the cost of an enclosure failure.
Supply concentration belongs to the same picture. China concentrated 18.5% of global liquid pump exports in 2024, valued at approximately USD 14.3 billion according to the Observatory of Economic Complexity, and China's liquid pump exports to Mexico alone reached USD 579.37 million in 2024. Grand View Research identifies Zhejiang LEO Group as a key competitor in the global submersible pump industry, while MarketsandMarkets names Grundfos, Xylem and KSB among the leading players in the industrial pump market. In a market with that many credible suppliers, documentation becomes a practical differentiator: an enclosure claim that can be traced to a document is easier to defend in a tender than one that cannot.
Future outlook
Two forces are likely to shape how IP ratings are specified and checked over the next procurement cycles.
The first is standards evolution. IEC 60335-2-41:2024 already sets safety requirements for electric submersible pumps for household and agricultural use, and the framework around it — including the EN editions referenced in European conformity documents — continues to be revised. Because standards carry edition references, the documents a supplier holds also carry an issue date and an edition. Buyers reviewing files should confirm which edition a certificate actually addresses rather than accepting a certificate number at face value.
The second is the efficiency and solar pairing trend. Motor lines now span IE2 through IE4 efficiency classifications with power from 1 to 430 HP, and solar pumping continues to expand into off-grid agricultural and residential use. When a pump runs in a borehole or a remote field installation, the enclosure rating and the motor efficiency class are read together, because both influence how long the unit stays in service without an intervention visit.
For buyers, the practical implication is a shift in the question asked at the evaluation stage — from which IP rating does this pump have, to which enclosure test backs this rating, for which models, and under which installation conditions. That is a harder question to answer, and a more useful one.
Frequently asked questions
What does IP44 mean, and when is it sufficient for a submersible pump?
IP44 combines a first digit of 4, meaning protection against the entry of small solid objects, with a second digit of 4, meaning protection against splashing water from any direction. It is sufficient where the pump housing is not immersed during normal operation and water contact is limited to splashing, for example a unit installed in a sheltered, dry position. It is not sufficient where the motor housing is designed to sit permanently in water.
How does IP68 differ from IP44 in an installed system?
IP68 combines a dust-tight first digit with a second digit of 8, indicating suitability for continuous immersion under conditions agreed between the manufacturer and the user. In an installed system the difference is exposure: an IP44 unit is specified for splash contact, while an IP68 unit is specified for permanent immersion in boreholes, wells, sumps, tanks and pools. The two ratings are not interchangeable, and using an IP44 unit in a permanently submerged position is a specification error rather than a performance shortfall.
How can a buyer verify an ingress protection claim before ordering?
Request the enclosure test report or the document that establishes the rating, check that it names the exact model being ordered, note the report or certificate number and the issuing body, and confirm which standards edition the file addresses. Then compare the certificate model list with the order. A document that names QB60 and HQBm, for example, does not automatically extend to a different model in the same catalog.
Does a CE mark or an LVD certificate prove that a submersible pump is IP68?
No. CE conformity for water pumps addresses directives such as 2014/35/EU (Low Voltage), 2014/30/EU (Electromagnetic Compatibility) and 2006/42/EC (Machinery). An LVD certificate references safety standards such as EN 60335-1 and EN IEC 60335-2-41, and an EMC certificate references standards such as EN IEC 55014-1 and EN IEC 55014-2. These documents cover electrical safety and electromagnetic compatibility. They are not IP test reports, and an enclosure rating requires its own supporting document.
Which enclosure material suits sewage, pool or agricultural duty?
HAPPY's Pumps range is built on cast iron, stainless steel and engineering plastics. Cast iron is generally used where mass and thermal stability matter, such as larger sewage and drainage units, and requires a corrosion strategy in aggressive water. Stainless steel is generally selected where long immersion and corrosion resistance matter, such as pool and clean-water duty. Engineering plastics suit smaller household, garden and clean-water applications and give way to metal as mechanical strength and temperature requirements rise.
Does an IP68 rating guarantee that the installed system will not leak?
No. The rating describes the enclosure as assembled and installed. Cable entries, glands, seal assembly, joint quality and installation practice determine the field result. An IP68 enclosure can still admit water if a gland is left loose or a joint is assembled incorrectly, and no IP rating protects against corrosion or abrasion caused by the pumped medium. The rating and the material specification both have to be right.
Summary
For a submersible pump, the IP rating is a statement about a specific enclosure under specific conditions, established by a specific document. The practical work at the research and evaluation stage is to match the rating to the installation environment, to match the material to the water chemistry, and to check that the paperwork names the model actually being purchased. Readers who want the underlying product and specification detail behind this reference can download the HAPPY Pumps product brochure: HAPPY Pumps product brochure.