1. Introduction to Deep Well Pumps
A deep well pump, also known as a submersible well pump, is the most widely used water intake equipment for underground water extraction. There are numerous models and types of deep well pumps on the market. Most buyers cannot distinguish the differences in materials, structures, usage and working conditions.
Improper pump selection will cause problems such as insufficient water output, low head, easy motor burnout, yellowish water, pump jamming by sediment, freezing cracking in winter and excessive power consumption.
Based on standard factory classification methods and plain language, this article fully disassembles deep well pumps from seven dimensions: driving mode, pump body material, impeller stages, well diameter, conveying medium, functional purpose and power voltage. Each type is explained clearly with advantages, disadvantages and applicable crowds to support accurate model selection.
2. First Classification: By Driving Mode (Basic Classification)
1. Electric Deep Well Pump (Mainstream Product)
Driven by an electric motor, this pump operates with power supply and has the highest market penetration rate.
Advantages: Low noise, stable water output, simple maintenance, low cost and 24-hour continuous operation.
Disadvantages: Stable power supply is required; unable to work during power outages.
Application: Rural domestic water use, farmland irrigation, factory water supply and general daily water intake.
2. Diesel Deep Well Pump (Special for Non-Electric Areas)
Powered by a diesel engine without municipal electricity supply, specially designed for remote non-electrified areas.
Advantages: Independent of power grid, suitable for wild environments, strong power and blackout resistance.
Disadvantages: High noise and fuel consumption, severe vibration and regular engine maintenance required.
Application: Unelectrified mountainous areas, wild land reclamation, temporary drought resistance and remote mines.
3. Solar DC Deep Well Pump (Energy-Saving New Energy Type)
Equipped with a brushless DC motor and powered by photovoltaic panels with pure solar energy.
Advantages: Zero electricity cost, energy conservation, environmental protection and burnout resistance; ideal for areas with sufficient sunlight all year round.
Disadvantages: Reduced water output on cloudy days, no water supply at night and high initial investment cost.
Application: Plateaus, pastures, barren mountains and remote areas without power grids.
3. Second Classification: By Pump Body Material (Determines Water Quality & Service Life)
1. Cast Iron Deep Well Pump
The pump head and shell are made of thick cast iron with a rough appearance.
Advantages: Lowest price, good sediment resistance, impact resistance and wear resistance.
Disadvantages: Prone to rust, causing yellowish water and corrosion; unsuitable for drinking water.
Application: Farmland irrigation, construction drainage and non-drinking water extraction.
2. 201 Stainless Iron Deep Well Pump (Low-Grade Stainless Steel)
Similar to stainless steel in appearance with low nickel content, easy to rust in water.
Advantages: Low price and exquisite appearance compared with cast iron pumps.
Disadvantages: Rusts in saline-alkali water with surface peeling after 1-2 years of use.
Application: Ordinary shallow domestic wells with limited budget and good water quality.
3. 304 Stainless Steel Deep Well Pump (Industrial General Type)
Made of national standard food-grade stainless steel with overall rust and corrosion resistance.
Advantages: Rust-free, clean water output, weak acid and alkali resistance and long service life.
Disadvantages: Higher price than cast iron and 201 stainless iron pumps.
Application: 90% of domestic drinking water wells, breeding farms, factories and conventional deep wells.
4. 316L Stainless Steel Deep Well Pump (High-End Anti-Corrosion Type)
Medical-grade material with excellent resistance to acid, alkali, seawater and saline-alkali corrosion.
Advantages: Extreme corrosion resistance, applicable for mineral water and hot spring water; service life exceeding 10 years.
Disadvantages: Premium price.
Application: Coastal water wells, saline-alkali land, hot springs, mines and corrosive water sources.
4. Third Classification: By Impeller Stage Structure (Determines Pump Head)
1. Single-Stage Deep Well Pump
Equipped with only one set of impellers and simple structure.
Features: Low head, large flow rate and short pump body.
Parameters: Pump head ranges from 10 to 40 meters.
Application: Shallow wells, plain water wells and areas with high water levels.
2. Multi-Stage Deep Well Pump (Market Mainstream)
Multiple groups of impellers are connected in series; more impellers mean higher head and longer pump body.
Features: High pressure and high head with strong water outlet pressure, suitable for deep well operation.
Parameters: Pump head ranges from 50 to 600 meters.
Application: Mountainous deep wells, high-rise pressurization and deep water extraction.
5. Fourth Classification: By Well Caliber (Diameter Distinction)
1. Small-Caliber Slim Deep Well Pump
Common calibers: 2-inch, 4-inch, 6-inch with a slender pump body.
Advantages: Suitable for small-diameter domestic wells with convenient installation and easy lowering.
Disadvantages: Relatively small flow rate, not applicable for large-area irrigation.
2. Large-Caliber High-Flow Deep Well Pump
Calibers: 8-inch, 10-inch, 12-inch with a thick and heavy pump body.
Advantages: Extremely high hourly water output, maximum up to 600 cubic meters.
Disadvantages: High requirements for well diameter, high price and large power consumption.
Application: Large water plants, reservoir water replenishment and large-scale farmland irrigation.
6. Fifth Classification: By Extracted Water Medium
1. Clean Water Deep Well Pump (QJ Conventional Type)
Only applicable for extracting clean water with low sediment content.
Features: Precision impellers with smooth water output; not suitable for sandy wells.
2. Sand-Proof Wear-Resistant Deep Well Pump
Designed with widened flow channels, hard alloy seals and sand baffling structures.
Features: Specially developed for sandy wells to prevent pump jamming.
3. Hot Water Deep Well Pump (QJR Hot Spring Pump)
Adopts high-temperature resistant coils and seals, capable of extracting hot water below 95℃.
Application: Hot spring development, geothermal engineering and high-temperature deep wells.
4. Corrosion-Resistant Seawater Deep Well Pump
Made of full 316L stainless steel with resistance to chloride ions and seawater salinity.
Application: Coastal tidal flats and wells affected by seawater intrusion.
7. Sixth Classification: By Functional Purpose
1. Civil Domestic Deep Well Pump
Low power, low noise, compact size and 220V single-phase voltage.
Parameters: 0.37KW - 2.2KW.
Features: Simple and durable for daily drinking, bathing and courtyard water supply.
2. Agricultural Irrigation Deep Well Pump
High flow rate, sturdy and durable, tolerant to slight sediment and long-term non-stop operation.
Parameters: 3KW - 7.5KW.
3. Industrial Special Deep Well Pump
High power and high head, 380V industrial voltage with IP68 waterproof rating.
Application: Factory circulating water, mine drainage and high-rise water pressurization.
4. Explosion-Proof Deep Well Pump
Equipped with sealed explosion-proof motor without spark generation; explosion-proof grade Exd II BT4.
Application: Petroleum plants, chemical parks and flammable & explosive hazardous areas.
8. Seventh Classification: By Power Supply Voltage
1. 220V Single-Phase Deep Well Pump
Applicable for household electricity with simple wiring without three-phase power supply.
Disadvantages: Maximum power generally does not exceed 3KW, unable to meet high-power demands.
2. 380V Three-Phase Deep Well Pump
Industrial power supply with sufficient power and stable operation to avoid motor burnout.
Application: High-power equipment above 3KW for farmland, factories and engineering projects.
3. Brushless DC Deep Well Pump
24V/48V/72V DC voltage, specially matched for solar power supply systems.