💧 WHSR703/4: Certikin Hydrostar MK4 7.2HP (5.4kW) Three-Phase Commercial Pool Pump

Elite-Performance Pump Delivering Exceptional Flow Rates with Whisper-Quiet Operation for Demanding Commercial Aquatic Facilities

📋 Product Overview

The Certikin Hydrostar MK4 7.2HP (5.4kW) three-phase commercial pump represents the pinnacle of pool circulation technology, specifically engineered for large-scale aquatic facilities requiring maximum performance combined with operational efficiency. This powerful pump features revolutionary hydraulic design optimization that delivers substantially improved flow rates whilst maintaining remarkably quiet operation—a combination essential for premium commercial environments.

Built around a robust 5.4kW IP55-rated three-phase motor and constructed with UV-stabilized glass-filled polypropylene housing, the Hydrostar MK4 offers unparalleled durability in the most demanding commercial applications. The redesigned hydraulic profile maximizes efficiency across the performance curve, whilst the enclosed glass-filled Noryl impeller and 431 stainless steel motor shaft ensure long-term reliability even in chemically aggressive pool water conditions.

Designed specifically for commercial installations including leisure centers, hotel pools, water parks, Olympic-standard training facilities, and large municipal aquatic centers, this pump combines the raw power needed for high-volume circulation with the sophisticated engineering that facility managers demand. The clear polycarbonate strainer lid with tool-free access and the generous 6-liter strainer basket minimize maintenance downtime, whilst the 90mm metric half union connections ensure straightforward installation and servicing.

⭐ Key Features

✅ Powerful 7.2HP (5.4kW) Three-Phase Motor – Delivers exceptional flow rates up to 180m³/hr, perfect for large commercial pools, water features, and high-demand circulation systems requiring sustained high-volume water movement

✅ Revolutionary Hydraulic Design – Completely redesigned pump internals optimize flow efficiency and dramatically reduce operational noise levels compared to previous generation models, making this ideal for noise-sensitive commercial environments

✅ Premium Construction Materials – UV-stabilized glass-filled polypropylene housing resists chemical degradation and weathering, enclosed glass-filled Noryl impeller ensures long-term performance, and 431 stainless steel motor shaft provides superior corrosion resistance in commercial pool water chemistry

✅ IP55 Weather-Resistant Motor – Fully protected against dust ingress and water jets from any direction, suitable for both indoor pump rooms and weather-protected outdoor installations with proper ventilation

✅ Clear Polycarbonate Strainer Lid – Enables instant visual inspection of strainer basket condition without opening the pump, reducing maintenance time and allowing proactive debris management

✅ Tool-Free Maintenance Access – Ergonomic lid lock ring with integrated handles allows quick basket access without tools, minimizing downtime during routine maintenance operations

✅ Large 6-Liter Strainer Basket – Generous capacity reduces cleaning frequency in high-debris environments, with robust molded polypropylene construction resisting chemical attack and physical damage

✅ Professional 90mm Metric Connections – Half union connections simplify installation and pump removal for servicing, with standardized sizing compatible with commercial pool plumbing systems

✅ Ultra-Quiet Operation – Advanced hydraulic design and precision engineering deliver exceptionally low noise levels even at full 5.4kW output, essential for premium hospitality environments and indoor facilities

✅ Optimized Energy Efficiency – Redesigned internals maximize flow per watt consumed, reducing operating costs across the pump’s operational life whilst delivering the performance demanded by commercial applications

🔧 Technical Specifications

Specification	Detail
Model Number	WHSR703/4
Power Rating	7.2HP (5.4kW)
Motor Type	Three-phase, IP55 protection
Voltage	400V (Three-phase WYE/STAR connection)
Maximum Flow Rate	Up to 180 m³/hr (dependent on head pressure)
Pump Housing Material	UV-stabilized glass-filled polypropylene
Strainer Lid	Clear polycarbonate with visual inspection window
Impeller Type	Enclosed glass-filled Noryl
Motor Shaft Material	431 stainless steel (corrosion resistant)
Strainer Basket Capacity	6 liters (large-capacity molded polypropylene)
Inlet Connection	90mm metric half union
Outlet Connection	90mm metric half union
Protection Rating	IP55 (dust and water jet protected)
Lid Access System	Tool-free quarter-turn lock ring with ergonomic handles
Motor Rotation	Clockwise (viewed from fan cowl end)
Maximum Working Pressure	35 PSI (pressure testing must be by qualified professional)
Operating Temperature Range	4°C to 40°C (39.2°F to 104°F)
Installation Requirement	Licensed electrician/certified serviceman
Electrical Protection Required	Starter switch/magnetic starter with overload protection, 30mA RCD for pool applications
Foundation Requirements	Solid, non-vibrating surface with adequate drainage
Warranty Coverage	1 year comprehensive warranty (commercial installations)

💰 Usage Costs & Running Expenses

📊 Annual Running Cost Calculation

The Hydrostar MK4 7.2HP pump’s 5.4kW motor consumption translates to predictable operational costs that facility managers can accurately budget for:

Standard Commercial Pool Operation (8 hours daily, year-round):

• Power consumption: 5.4 kW
• Daily operation: 8 hours
• Annual operating days: 365 days
• Total annual hours: 2,920 hours
• Current UK commercial electricity rate: £0.26 per kWh (Q4 2025 average)
• ✅ Annual electricity cost: 5.4 × 2,920 × £0.26 = £4,099

Seasonal Outdoor Pool Operation (10 hours daily, 180 days):

• Power consumption: 5.4 kW
• Daily operation: 10 hours
• Seasonal operating days: 180 days (May-October)
• Total seasonal hours: 1,800 hours
• Current UK commercial electricity rate: £0.26 per kWh
• ✅ Seasonal electricity cost: 5.4 × 1,800 × £0.26 = £2,527

High-Intensity Water Park Operation (12 hours daily, year-round):

• Power consumption: 5.4 kW
• Daily operation: 12 hours
• Annual operating days: 365 days
• Total annual hours: 4,380 hours
• Current UK commercial electricity rate: £0.26 per kWh
• ✅ Annual electricity cost: 5.4 × 4,380 × £0.26 = £6,148

⚡ Energy Efficiency Advantage

The Hydrostar MK4’s redesigned hydraulics deliver superior efficiency compared to older commercial pump technology. Three-phase motors inherently operate 15-25% more efficiently than equivalent single-phase alternatives, whilst the optimized impeller design maximizes flow per watt consumed.

Comparison vs. Older Technology (10-year-old 7.5HP pump running 8 hrs/day year-round):

• ❌ Old technology consumption: ~6.2 kW (older, less efficient motor)
• ❌ Old annual cost: 6.2 × 2,920 × £0.26 = £4,709
• ✅ Hydrostar MK4 annual cost: 5.4 × 2,920 × £0.26 = £4,099
• 💰 Annual saving: £610
• ⏱ Additional benefit: Reduced maintenance costs, improved reliability, quieter operation

🎯 Real World Examples & Applications

🏊‍♂️ Municipal Leisure Centers

The 7.2HP Hydrostar MK4 excels in 25m municipal pools requiring continuous high-volume circulation. The pump’s 180m³/hr maximum flow capacity handles main circulation duties whilst the whisper-quiet operation ensures minimal noise intrusion in indoor environments. Facility managers appreciate the tool-free maintenance access during busy operational schedules.

🛁 Hotel & Resort Pool Complexes

Premium hospitality venues demand both performance and quiet operation—the MK4 delivers both. The ultra-quiet design ensures guest experience isn’t compromised by pump noise, whilst the robust construction handles continuous year-round operation in chemically treated commercial pool environments.

🌊 Commercial Water Parks

High-flow applications including wave pools, lazy rivers, and water features benefit from the MK4’s exceptional flow rates and three-phase reliability. The IP55-rated motor withstands splash environments common in water park installations, whilst the 6-liter strainer basket copes with higher debris loads from outdoor installations.

🏢 Large Residential Developments

Substantial apartment complexes and gated communities with shared pool facilities require commercial-grade equipment. The Hydrostar MK4 provides the reliability and performance needed for shared facilities whilst offering predictable operational costs for facility budgeting.

🔄 Upgrade & Replacement Projects

Replacing aging single-phase or older three-phase pumps with the Hydrostar MK4 delivers immediate efficiency improvements. The standardized 90mm connections simplify retrofitting, whilst the improved flow characteristics can reduce circulation times and associated energy consumption.

💡 Cost Savings Examples

📍 Scenario 1: Replacing 10-Year-Old Single-Phase Pump in Municipal Pool

Old System:

• ❌ 10-year-old single-phase 7.5HP pump
• ❌ Estimated consumption: 6.2 kW (accounting for age-related efficiency loss)
• ❌ Operation: 8 hours/day, 365 days/year = 2,920 hours annually
• ❌ Annual cost: 6.2 × 2,920 × £0.26 = £4,709

New Hydrostar MK4 System:

• ✅ Modern three-phase 7.2HP (5.4kW) pump
• ✅ Actual consumption: 5.4 kW
• ✅ Operation: 8 hours/day, 365 days/year = 2,920 hours annually
• ✅ Annual cost: 5.4 × 2,920 × £0.26 = £4,099

💰 Annual saving: £610 ⏱ Simple payback period: ~8-9 years (considering pump cost vs. energy savings) 📈 Additional benefits: Reduced maintenance costs, improved reliability, lower noise levels, better warranty coverage

📍 Scenario 2: Hotel Outdoor Pool – Seasonal Operation Comparison

Current Less-Efficient System:

• ❌ Older 7.5HP pump with lower efficiency
• ❌ Power draw: 6.0 kW
• ❌ Operation: 10 hours/day, 180 days (May-October) = 1,800 hours seasonally
• ❌ Seasonal cost: 6.0 × 1,800 × £0.26 = £2,808

Upgraded Hydrostar MK4:

• ✅ Efficient 5.4kW three-phase motor
• ✅ Operation: 10 hours/day, 180 days = 1,800 hours seasonally
• ✅ Seasonal cost: 5.4 × 1,800 × £0.26 = £2,527

💵 Seasonal saving: £281 📊 Over 5 years: £1,405 total savings 💷 Plus: Quieter operation enhances guest experience, reduced complaint risk

📍 Scenario 3: Water Park High-Intensity Application

Existing Older Equipment:

• ❌ 15-year-old 7.5HP commercial pump
• ❌ Estimated consumption with age degradation: 6.5 kW
• ❌ Operation: 12 hours/day, 365 days = 4,380 hours annually
• ❌ Annual cost: 6.5 × 4,380 × £0.26 = £7,403

Modern Hydrostar MK4:

• ✅ Optimized 5.4kW motor with modern efficiency
• ✅ Operation: 12 hours/day, 365 days = 4,380 hours annually
• ✅ Annual cost: 5.4 × 4,380 × £0.26 = £6,148

💸 Annual saving: £1,255 ⏱ Payback period: ~4-5 years 📈 10-year total saving: £12,550 (assuming stable energy prices) 💰 Additional benefit: Protection against future energy price increases through superior efficiency

📍 Scenario 4: Comparing Three-Phase vs. Single-Phase Technology

For facilities considering whether to invest in three-phase infrastructure or stay with single-phase equipment:

Single-Phase Alternative (equivalent 7.5HP):

• ❌ Typical consumption: 6.3 kW (single-phase motors inherently less efficient)
• ❌ Annual operation (8hrs/day, 365 days): 2,920 hours
• ❌ Annual cost: 6.3 × 2,920 × £0.26 = £4,786

Three-Phase Hydrostar MK4:

• ✅ Efficient three-phase consumption: 5.4 kW
• ✅ Annual operation (8hrs/day, 365 days): 2,920 hours
• ✅ Annual cost: 5.4 × 2,920 × £0.26 = £4,099

💰 Annual three-phase advantage: £687 📊 Over pump lifetime (10 years): £6,870 total savings ⚡ Additional benefits: Superior motor starting characteristics, more reliable operation, better suited to commercial/industrial power supplies

📥 Downloads & Resources

Technical Documentation & Installation Resources:

📄 Commercial Pump Installation & Operation Manual – Comprehensive 17-page manual covering installation procedures, electrical specifications, start-up protocols, maintenance schedules, troubleshooting guides, and warranty information (PDF, 2.1MB)

📄 Hydrostar MK4 Product Datasheet – Complete technical specifications, performance curves, dimensional drawings, and connection details (PDF)

These professional resources provide essential information for qualified installers, facility managers, and maintenance personnel. All installation and electrical work must be performed by licensed/certified professionals in accordance with applicable local codes and ordinances.

💎 Why Buy From Parts4tubs?

✅ Genuine OEM Equipment – We supply authentic Certikin commercial-grade pumps direct from authorized distribution channels, ensuring full manufacturer warranty coverage and genuine component quality

✅ Expert Commercial Knowledge – Our team understands commercial pool applications and can provide technical guidance on pump selection, installation requirements, and system integration

✅ Competitive Pricing – Volume purchasing relationships with manufacturers enable us to offer competitive pricing on professional commercial equipment without compromising on quality

✅ Fast Delivery – Efficient logistics ensure quick delivery of commercial pumps to minimize installation delays and facility downtime

✅ Full Technical Support – Access to technical documentation, installation guidance, and post-purchase support for facility managers and installation contractors

✅ Established Reputation – Years of experience supplying commercial pool equipment to leisure centers, hotels, municipal facilities, and contractors throughout the UK

🏆 Why Choose This Product

✅ Commercial-Grade Reliability – Engineered specifically for demanding commercial applications where downtime is costly and performance is non-negotiable, the Hydrostar MK4 delivers the consistency facility managers require

✅ Whisper-Quiet Operation – The revolutionary hydraulic design produces exceptionally low noise levels even at full 5.4kW output, making this ideal for indoor facilities, premium hotels, and noise-sensitive environments where traditional commercial pumps would be unacceptable

✅ Superior Energy Efficiency – Three-phase motor technology combined with optimized hydraulics delivers more flow per watt consumed than older pump designs, translating to hundreds or thousands of pounds in annual energy savings across the pump’s operational life

✅ Reduced Maintenance Downtime – Tool-free strainer access, clear inspection lid, and robust construction minimize the time maintenance staff spend servicing the pump, reducing labor costs and maximizing facility uptime

✅ Long-Term Durability – Premium materials including UV-stabilized glass-filled polypropylene housing, 431 stainless steel shaft, and glass-filled Noryl impeller ensure extended service life even in chemically aggressive commercial pool water chemistry

✅ Professional Installation Support – Comprehensive technical documentation, standardized 90mm connections, and clear electrical specifications simplify installation for qualified contractors, reducing installation time and potential complications

✅ Future-Proof Investment – Modern three-phase efficiency protects against rising energy costs whilst the robust construction ensures the pump will serve your facility reliably for many years, making this a sound long-term capital investment

✨ Summary

The Certikin Hydrostar MK4 WHSR703/4 7.2HP (5.4kW) three-phase commercial pump represents professional-grade circulation technology engineered specifically for demanding commercial aquatic environments. Combining powerful 180m³/hr flow capacity with whisper-quiet operation and superior energy efficiency, this pump delivers the performance large facilities require whilst minimizing operational noise and running costs.

With robust UV-stabilized construction, IP55 weather protection, tool-free maintenance access, and genuine three-phase motor efficiency delivering annual savings of hundreds of pounds compared to older technology, the Hydrostar MK4 offers commercial facility managers an excellent balance of performance, reliability, and cost-effectiveness. Whether you’re managing a municipal leisure center, hotel pool complex, water park, or large residential development, this pump provides the commercial-grade quality and consistent performance your facility demands.