🏊‍♂️ Poolex Megaline Fi 35 Commercial Inverter Pool Heat Pump – 35kW Full Inverter with WiFi Control

Transform your commercial or public swimming pool with the ultimate heating solution. The Poolex Megaline Fi 35 is a professional-grade, full inverter heat pump engineered specifically for hotels, resorts, leisure centres, sports complexes, and large private pools. With advanced Mitsubishi inverter technology, built-in WiFi control, and exceptional energy efficiency, this heat pump delivers reliable year-round performance while dramatically reducing operating costs.

Whether you’re heating a busy municipal pool or maintaining perfect temperatures at a luxury resort, the Megaline Fi 35 provides the power, precision, and reliability that commercial operations demand.

Built for Commercial Demands Unlike residential heat pumps, the Megaline Fi 35 is purpose-built for heavy-duty commercial use with stainless steel construction, professional-grade components, and a vertical airflow design that minimizes space requirements while maintaining whisper-quiet operation.

Exceptional Energy Efficiency Save up to 80% on heating costs compared to traditional electric or gas heaters. With stepless DC inverter technology, the compressor and fan speed automatically adjust to match your exact heating needs, eliminating energy waste and reducing your carbon footprint.

Smart WiFi Control Manage your pool heating from anywhere using the Smart Life App (iOS/Android). Monitor temperatures, adjust settings, set schedules, and receive real-time alerts—all from your smartphone or tablet.

Extended Season Operation Unlike standard heat pumps that struggle in cold weather, the Megaline Fi 35 operates efficiently down to -15°C ambient temperature, enabling year-round pool heating even in challenging climates.

Whisper-Quiet Performance At just <47 dB at 10 metres, the Megaline Fi 35 is quieter than a normal conversation. The vertical airflow design and inverter-controlled fans ensure peaceful operation that won’t disturb guests or neighbours.

Built to Last Premium stainless steel casing, twisted titanium heat exchanger, and Mitsubishi rotary inverter compressor deliver exceptional durability. Backed by a comprehensive 3-year parts & labour warranty, 7-year compressor warranty, and 15-year heat exchanger warranty (parts only after year 3).

🔥 Key Features & Benefits

Unmatched Heating Performance

✅ 35kW heating capacity at A15/W26 (air 15°C, water 26°C) ✅ 42.5kW maximum output at A26/W26 (ideal summer conditions) ✅ Variable capacity from 15.2kW to 42.5kW – precisely matches demand ✅ COP up to 11.46 in optimal conditions (A26/W26) for maximum efficiency ✅ COP up to 7.46 even at A15/W26 – outstanding cold-weather performance

Commercial-Grade Construction

✅ Stainless steel structure – corrosion-resistant for outdoor installation ✅ Twisted Titanium heat exchanger – exceptional durability and chemical resistance ✅ Mitsubishi rotary inverter compressor – proven reliability and efficiency ✅ Powder-coated galvanised steel casing – weather-resistant finish ✅ 175kg robust build – engineered for continuous commercial operation

Advanced Full Inverter Technology

✅ Stepless DC inverter system – compressor and fans modulate in real-time ✅ Intelligent load matching – uses only the energy required ✅ Soft-start technology – reduced electrical demand and longer component life ✅ Precise temperature control – maintains setpoint within ±0.5°C

Smart Control & Monitoring

✅ Built-in WiFi connectivity – control via Smart Life App (iOS/Android) ✅ Large touchscreen LCD panel – intuitive on-site operation ✅ Multiple operating modes: Heating, Cooling, Silence, and Auto ✅ Programmable timers – dual scheduling for automated operation ✅ Remote temperature monitoring – check pool temperature from anywhere ✅ Real-time alerts – instant notifications of any issues

All-Season Reliability

✅ Operates down to -15°C ambient temperature ✅ Automatic hot gas defrost – maintains performance in cold conditions ✅ Dual antifreeze protection system – prevents frost damage ✅ Wide operating range: -15°C to +43°C ✅ Heating range: 15°C to 40°C water temperature ✅ Cooling capability: 8°C to 28°C water temperature

Ultra-Quiet Operation

✅ <47 dB at 10 metres – quieter than background conversation ✅ Vertical airflow design – reduces noise transmission ✅ Inverter-controlled EC fans – whisper-quiet at low speeds ✅ Silence mode – further noise reduction when needed ✅ Vibration-dampened mounting – minimal structural noise

Easy Installation & Maintenance

✅ Compact footprint: 1005mm × 936mm × 885mm ✅ 63mm water connections – standard commercial sizing ✅ 15 m³/h nominal flow rate – compatible with most systems ✅ Vertical design – minimum installation space required ✅ Tool-free access panels – simplified maintenance ✅ Clear diagnostic displays – quick fault identification

Environmentally Responsible

✅ R32 refrigerant – lower global warming potential than R410A ✅ Up to 80% energy savings vs. traditional heating ✅ Reduced carbon emissions – sustainable pool heating ✅ CE and TÜV certified – meets European environmental standards ✅ RoHS compliant – environmentally friendly manufacturing

📊 Complete Technical Specifications

Heating Performance Data

Operating Conditions	Maximum Capacity	Minimum Capacity	Power Consumption	COP Efficiency
A26/W26 (26°C air, 26°C water, 80% humidity)	42.5 kW	15.2 kW	7.34 ~ 1.55 kW	11.46 ~ 5.79
A15/W26 (15°C air, 26°C water, 70% humidity)	35 kW	16.54 kW	6.99 ~ 1.55 kW	7.46 ~ 4.80
A6/W26 (6°C air, 26°C water)	45 kW*	10.2 kW	11.4 ~ 1.7 kW	5.84 ~ 3.96

*Values from extended specifications table

Cooling Performance Data

Operating Conditions	Maximum Capacity	Minimum Capacity	Power Consumption	EER Efficiency
A35/W27 (35°C air, 27°C water)	37 kW	9.1 kW	10.2 ~ 1.4 kW	6.67 ~ 3.63

Electrical Specifications

Parameter	Specification
Power Supply	Three-phase 380-415V / 3N~ / 50Hz
Maximum Power	9.5 kW
Maximum Current	14 A
Recommended Cable	RO2V 5 × 4mm² (up to 10m run)
Required Protection	32A D-curve circuit breaker
Differential Protection	30mA RCD (upstream)

Hydraulic Specifications

Parameter	Specification
Water Connections	63mm (2½”)
Nominal Flow Rate	15 m³/h
Pressure Loss	0.5 mCE (5 kPa)
Minimum Flow Rate	12 m³/h
Maximum Flow Rate	18 m³/h

Refrigeration System

Component	Specification
Refrigerant Type	R32 (environmentally friendly)
Refrigerant Charge	4.0 kg
Compressor Type	Mitsubishi rotary inverter
Number of Compressors	1
Heat Exchanger	Twisted titanium tube in PVC shell
Expansion System	Electronic expansion valve (EEV)
Defrost System	Automatic hot gas reverse cycle

Operating Parameters

Parameter	Range
Ambient Temperature Range	-15°C to +43°C
Heating Water Temperature	15°C to 40°C
Cooling Water Temperature	8°C to 28°C
Operating Pressure Range	0.2 ~ 4.4 MPa
Default Heating Setpoint	27°C
Temperature Hysteresis	1°C (adjustable 1-18°C)

Physical Specifications

Parameter	Dimension
Length	1005 mm
Width	936 mm
Height	885 mm
Net Weight	175 kg
Shipping Weight	Approx. 195 kg

Acoustic Performance

Distance	Sound Pressure Level
At 1 metre	≤65 dB(A)
At 4 metres	≤58 dB(A)
At 10 metres	≤47 dB(A)

Measured in accordance with EN ISO 3741 and EN ISO 354

🏊 Pool Sizing Guide & Performance Calculator

Recommended Pool Volumes

The Megaline Fi 35 is ideally suited for commercial and large residential pools. Capacity recommendations based on pool type and usage:

Pool Type	Recommended Volume	Notes
Commercial Indoor Pools	80 – 150 m³	Well-insulated, covered when not in use
Commercial Outdoor Pools	60 – 120 m³	Requires solar cover, sheltered location preferred
Hotel/Resort Pools	70 – 140 m³	Moderate usage, good cover discipline
Public Leisure Pools	70 – 120 m³	Heavy usage, requires oversizing for demand
Large Private Pools	Up to 160 m³	Low usage, excellent cover regime

Important: Pool sizing depends on multiple factors including insulation, usage patterns, desired temperature, climate, and whether a solar cover is used. For optimal results, always use a solar cover when the pool is not in use.

Heat-Up Time Estimates

Formula Used: Time (hours) = (Pool Volume in m³ × Temperature Rise in °C × 1.16) ÷ Heat Pump kW Rating

At A15/W26 Conditions (35kW output – typical spring/autumn)

Pool Volume	5°C Rise	8°C Rise	10°C Rise	15°C Rise
80 m³	10.6 hours	17.0 hours	21.2 hours	31.8 hours
100 m³	13.3 hours	21.2 hours	26.5 hours	39.7 hours
120 m³	15.9 hours	25.5 hours	31.8 hours	47.7 hours
140 m³	18.6 hours	29.7 hours	37.1 hours	55.7 hours

Typical usage: Raising pool from 18°C to 26°C (8°C rise) = approximately 21-30 hours for 100-120 m³ pools

At A26/W26 Conditions (42.5kW output – peak summer)

Pool Volume	5°C Rise	8°C Rise	10°C Rise	12°C Rise
80 m³	8.7 hours	14.0 hours	17.5 hours	21.0 hours
100 m³	10.9 hours	17.5 hours	21.9 hours	26.3 hours
120 m³	13.1 hours	21.0 hours	26.3 hours	31.5 hours
140 m³	15.3 hours	24.5 hours	30.6 hours	36.7 hours

Typical usage: Initial heating in summer (20°C to 28°C) = approximately 18-21 hours for 100 m³ pools

⚠️ Important Disclaimers:

• These are theoretical estimates based on the heat pump operating continuously at stated capacity
• Actual heat-up times vary significantly based on: ambient temperature, wind exposure, pool insulation, water chemistry, altitude, humidity, and heat losses during the heating period
• Pools without covers will take substantially longer to heat
• Heat-up times assume the pool’s circulation system is properly sized for the heat pump
• For precise sizing and performance predictions, consult with a qualified pool heating professional

Daily Temperature Maintenance

Once at target temperature, the Megaline Fi 35 typically maintains pool temperature with 2-6 hours of daily operation, depending on weather conditions and pool cover usage.

Best Practice: Use a solar cover or automatic pool cover to reduce heat loss by 70-90%, dramatically improving efficiency and reducing running costs.

💰 Running Cost Analysis

Operating Cost Comparison (Based on 100 m³ pool, 26°C target temperature)

The Megaline Fi 35’s exceptional COP ratings translate to significant cost savings compared to traditional heating methods:

Heating Method	Seasonal Energy Use	Estimated Annual Cost*	CO₂ Emissions
Megaline Fi 35 Heat Pump	4,500 kWh	£1,350	0.9 tonnes
Standard Heat Pump (COP 4.5)	6,800 kWh	£2,040	1.4 tonnes
Electric Resistive Heater	28,000 kWh	£8,400	5.9 tonnes
Gas Boiler (80% efficiency)	33,600 kWh gas	£2,350	6.7 tonnes
LPG Boiler (80% efficiency)	33,600 kWh LPG	£4,700	7.8 tonnes

*Estimates based on: 6-month heating season (April-September), moderate climate, pool covered when not in use, UK electricity at £0.30/kWh, gas at £0.07/kWh, LPG at £0.14/kWh. Your actual costs will vary based on usage, climate, electricity tariffs, and operating conditions.

📄 Downloads & Documentation

Essential documents to support your installation and operation:

📄 Installation & User Manual – Poolex Megaline Fi (opens in new tab) Complete 39-page manual covering installation procedures, electrical connections, hydraulic diagrams, operation instructions, WiFi setup, maintenance schedules, troubleshooting guides, and wiring schematics. Essential reading for installers and facility managers.

📄 Technical Specification Sheet – Megaline Fi Range (opens in new tab) Detailed datasheet with performance curves, COP ratings at multiple operating conditions, dimensional drawings, electrical specifications, and warranty information for the complete Megaline Fi range (35-100kW models).

Annual Savings vs. Alternative Heating

• Save up to £7,050/year vs. electric heating
• Save up to £1,000/year vs. gas heating
• Save up to £3,350/year vs. LPG heating
• Save up to £690/year vs. standard heat pump

Payback Period: Typically 2-4 years depending on replaced heating method and usage patterns.

⚙️ Advanced Features & Technology

Full Inverter Technology Explained

Unlike traditional on/off heat pumps, the Megaline Fi 35 uses stepless DC inverter technology for both the compressor and fans. This means:

• Compressor modulation: Adjusts from 20% to 100% capacity in real-time
• Variable fan speed: Reduces to minimum flow when less heat extraction needed
• Soft-start capability: Reduces inrush current and mechanical stress
• Continuous operation: Eliminates energy-wasting start/stop cycles
• Peak efficiency: Operates at optimal performance point for current conditions

Result: Up to 30% more efficient than fixed-speed heat pumps, quieter operation, and extended equipment lifespan.

Intelligent Hot Gas Defrost

The Megaline Fi 35 automatically detects frosting conditions and initiates defrost cycles when needed:

• Automatic activation when coil temperature drops and ambient conditions favour frosting
• Hot gas reverse cycle melts ice quickly without electric elements
• Minimal heating interruption – typical defrost cycle 5-10 minutes
• Pump continues running during defrost to prevent water freezing
• Adjustable parameters for optimal performance in your specific climate

Dual Antifreeze Protection

Level 1 Protection: When ambient temperature falls below 2°C

• Circulation pump runs 5 minutes every 40 minutes to prevent water stagnation
• If water temperature drops below 4°C, pump runs continuously

Level 2 Protection: When ambient temperature is below 2°C AND water temperature below 4°C

• Heat pump automatically switches to heating mode
• Continues heating until water reaches 15°C OR ambient temperature exceeds 8°C
• Prevents frost damage to heat exchanger and pool equipment

Critical: Heat pump must remain powered for antifreeze systems to function.

WiFi Control via Smart Life App

Remote Capabilities Include:

• Monitor current pool and ambient temperatures
• Adjust target temperature remotely
• Switch between heating, cooling, silence, and auto modes
• Create and modify time schedules
• Receive push notifications for errors or alerts
• View operating statistics and energy consumption
• Share control with multiple users
• Compatible with Amazon Alexa and Google Home (in supported regions)

Setup: Simple QR code pairing process takes less than 5 minutes. Works with 2.4GHz WiFi networks (5GHz not supported).

Comprehensive Safety Features

• High pressure protection – dual redundant switches
• Low pressure protection – prevents compressor damage
• Water flow switch – ensures adequate flow before operation
• Overtemperature protection – exhaust and coil sensors
• Phase sequence protection – prevents reverse rotation damage (3-phase)
• Anti-short cycle timer – minimum 3-minute delay between starts
• Low ambient lockout – prevents operation below -15°C
• Auto-restart after power failure – resumes with previous settings

🔧 Installation Requirements

Site Requirements

Minimum Clearances:

• Front: 1000mm (air discharge – must remain clear)
• Sides: 1000mm each side (for maintenance access)
• Rear: 1000mm (air intake – must remain clear)
• Top: No overhead obstructions within 2000mm

Foundation:

• Level concrete pad minimum 100mm thick
• Capable of supporting 200kg+ equipment weight
• Must provide adequate drainage for condensate water
• Vibration isolation pads recommended for noise-sensitive installations

Location Considerations:

• Outdoor installation with protection from direct sun preferred
• Avoid enclosed spaces with restricted airflow
• Keep away from bedroom windows and neighbouring property boundaries
• Protect from prevailing winds when possible
• Ensure adequate drainage around unit

Hydraulic Connection

By-Pass Kit Required:

• 3-valve by-pass assembly for flow control and isolation
• Allows heat pump isolation for maintenance without stopping filtration
• Valves should be half-open for optimal flow rate
• Install flow control valves close to heat pump for easy adjustment

Installation Position:

• Heat pump must be installed AFTER filtration
• Heat pump must be installed BEFORE automated treatment systems (chlorination, pH dosing)
• Connect with flexible PVC pipes to reduce vibration transmission
• Use 63mm (2½”) PVC fittings

Hydraulic Protection:

• Water filter must be upstream of heat pump
• Filter must be regularly cleaned to maintain flow
• Y-strainer recommended in addition to main filter
• Pressure gauge recommended for system monitoring

Electrical Installation

Power Requirements:

• Three-phase 380-415V / 50Hz supply required
• 32A D-curve thermal-magnetic circuit breaker
• 30mA upstream RCD (differential switch) mandatory
• RO2V 5 × 4mm² cable for runs up to 10 metres
• Larger cable required for longer runs – consult electrician

Important Notes:

• MUST be installed by qualified electrician
• Correct phase sequence essential for 3-phase operation
• Emergency stop button required for public installations
• Heat pump must remain powered year-round for antifreeze protection
• Can control circulation pump up to 5A (1000W) – use relay for larger pumps

Water Treatment Compatibility

Compatible With: ✅ Chlorine tablets/granules ✅ Salt chlorination systems ✅ Bromine systems ✅ UV disinfection ✅ Ozone systems ✅ Mineral sanitizers

Requirements:

• pH must be maintained between 6.9 and 8.0
• Treatment equipment must be installed AFTER heat pump in hydraulic circuit
• Regular water testing essential
• TDS (Total Dissolved Solids) should not exceed 2000 ppm

🛠️ Maintenance & Service

Routine Maintenance Schedule

Weekly:

• Check water flow and filter pressure
• Verify pool chemical levels (pH 6.9-8.0)
• Listen for unusual noises

Monthly:

• Clean pool filter or backwash as needed
• Check heat pump for debris accumulation
• Verify target temperature settings

Quarterly:

• Clean evaporator fins with vacuum and soft brush
• Check all electrical connections for tightness
• Inspect for refrigerant oil stains or leaks
• Test safety features and pressure switches

Annually (by qualified technician):

• Complete safety inspection
• Refrigerant level and pressure check
• Electrical system verification including earthing
• Pressure gauge calibration
• Fan bearing inspection and lubrication
• Control board and sensor testing
• Full system performance test

Winter Storage (If Required)

If ambient temperatures regularly fall below 3°C and the heat pump will not be used:

1. Disconnect power at circuit breaker
2. Isolate water flow using by-pass valves (close inlet/outlet, open by-pass)
3. Drain heat pump completely using drain plug
4. Protect openings with rags or caps to prevent debris entry
5. Cover unit with breathable cover (not airtight)

IMPORTANT: If the pool will remain filled and you want antifreeze protection, the heat pump MUST remain powered.

Warranty Support

Standard Warranty:

• 3 years parts & labour on complete unit
• 7 years on Mitsubishi compressor
• 15 years on titanium heat exchanger (against corrosion)

Warranty Conditions:

• Installation must be performed by qualified professional
• Unit must be registered online within 30 days of installation
• Annual maintenance by qualified technician recommended
• Does not cover damage from improper installation, water chemistry, or freezing
• Proof of purchase and installation required

Extended Warranty: Available for commercial installations – contact supplier for details.

❓ Frequently Asked Questions

General Operation

Q: How long does it take to heat my pool initially? A: For a typical 100 m³ commercial pool, expect 21-26 hours to raise temperature by 8°C under average spring conditions (15°C ambient). Summer heating is faster. Actual time depends heavily on weather conditions, pool insulation, and whether you use a cover. See our heat-up calculator above for specific scenarios.

Q: How much does it cost to run per day? A: Operating costs vary significantly with weather and usage. As a rough guide, expect £3-8 per day during the heating season for a 100 m³ pool, with costs lowest in warm weather and highest in cold conditions. Using a solar cover can reduce costs by 50-70%.

Q: Why does the COP vary so much? A: COP (Coefficient of Performance) is the ratio of heat output to electrical input. It varies based on the temperature difference between air and water – the smaller the difference, the higher the COP. The Megaline Fi 35 achieves COP 11.46 in ideal conditions (26°C air, 26°C water) but still delivers excellent COP 4.80+ even when air temperature drops to 6°C.

Q: Will it work in winter? A: Yes, the Megaline Fi 35 operates down to -15°C ambient temperature, though efficiency decreases in very cold weather. It’s ideal for extending your pool season into spring and autumn, and can even maintain heated pools in moderate winter climates. Very cold climates may require supplementary heating.

Q: What’s the difference between “Full Inverter” and standard inverter? A: Full Inverter means BOTH the compressor AND fans modulate continuously (20-100% capacity). Standard inverters typically only modulate the compressor. This provides better efficiency, quieter operation, and more precise temperature control.

Installation & Setup

Q: Do I need three-phase power? A: Yes, the Megaline Fi 35 requires three-phase 380-415V electricity supply. This is standard for commercial buildings but may not be available in all residential locations. Single-phase models are not available in this size.

Q: Can I install it myself? A: No. Installation MUST be performed by a qualified professional. It requires proper electrical work (three-phase connection), hydraulic integration, refrigerant system knowledge, and compliance with local building codes. DIY installation will void your warranty.

Q: How close can it be to the pool? A: There’s no minimum distance, but the unit must be installed with proper clearances (1m on all sides and front), adequate drainage, and protection from pool splash. Locate as close as practical to minimize pipe runs, but ensure good ventilation around the unit.

Q: Can it be installed indoors? A: Not recommended. The Megaline Fi 35 is designed for outdoor installation. It exhausts large volumes of cold air and requires excellent ventilation. Indoor installation requires special mechanical room design with adequate air supply/exhaust and is generally only done in large commercial facilities with proper HVAC design.

Q: Do I need a by-pass kit? A: Yes, absolutely essential. The by-pass allows flow adjustment for optimal performance and lets you isolate the heat pump for maintenance without stopping your filtration system. Quality by-pass kits include pressure gauges for precise flow monitoring.

Performance & Efficiency

Q: Why does my heat pump run but the pool isn’t heating? A: Several normal reasons: (1) Inverter is running at very low capacity during mild weather, (2) Pool is losing heat as fast as it’s being added (needs better cover), (3) Target temperature already reached, (4) Defrost cycle active. If none of these apply, check for error codes and verify water flow.

Q: Is it better to run 24/7 or use timers? A: For best efficiency, run continuously during the heating season. The inverter technology modulates down when less heat is needed, using minimal power. Frequent on/off cycling wastes energy and causes wear. Use timers only if you want to avoid heating during specific hours (e.g., off-peak electricity rates).

Q: How can I improve efficiency? A: Top tips: (1) Use a solar cover religiously – reduces heat loss by 70-90%, (2) Maintain proper water chemistry to prevent scale buildup, (3) Keep evaporator fins clean, (4) Ensure adequate water flow through heat pump, (5) Lower your target temperature by 1-2°C, (6) Install heat pump in shade or with sun protection.

Q: Does it really save 80% compared to electric heating? A: Yes, but this figure compares against electric resistive heating (100% efficiency). A COP of 5.0 means the heat pump produces 5 kW of heat for every 1 kW of electricity consumed – an 80% saving. However, savings vary with conditions; COP is highest in warm weather and decreases in cold weather.

Q: Why is my heat pump frosting up? A: Normal in cool, humid conditions (below 10°C with high humidity). The unit automatically defrosts using hot gas reverse cycle. If frosting is excessive or defrost cycles very frequent, check for: restricted airflow, dirty evaporator coils, low refrigerant charge, or excessively cold water temperature.

Features & Control

Q: Do I need WiFi to operate it? A: No. The touchscreen control panel provides full operation capabilities. WiFi is optional for remote monitoring and control convenience via the Smart Life app.

Q: Can I control multiple heat pumps with one app? A: Yes, the Smart Life app supports unlimited devices. You can monitor and control multiple heat pumps from a single interface – ideal for facilities with several pools.

Q: What does “Silence Mode” do? A: Silence Mode reduces fan speed to minimum while still maintaining heating/cooling function, lowering noise output by approximately 5-7 dB. Heating capacity is reduced but operation is significantly quieter – ideal for noise-sensitive times.

Q: Will it cool my pool in summer? A: Yes! The Megaline Fi 35 offers full cooling capability, lowering water temperature from 8°C to 28°C. This is valuable for commercial pools in hot climates where water temperature can become uncomfortable (above 30°C). Cooling mode operates with EER up to 6.67.

Q: What’s Auto Mode? A: Auto Mode lets the heat pump automatically switch between heating and cooling based on the set temperature. It will heat when water temperature drops below setpoint and cool when temperature exceeds setpoint – perfect for maintaining precise temperature year-round.

Maintenance & Troubleshooting

Q: How often should it be serviced? A: Professional service recommended annually, with quarterly checks by facility staff. Regular maintenance includes cleaning evaporator fins, checking refrigerant levels, inspecting electrical connections, and testing safety features.

Q: What if I get an error code? A: The display shows error codes like “E01” through “E22”. Common codes include: E01 (water flow issue), E02/E03 (pressure problems), E04 (low temperature protection). Press the error icon for details. Refer to the installation manual for complete error code list and troubleshooting steps. Many issues resolve with basic checks (water flow, filter cleaning, power cycling).

Q: Can I clear error codes myself? A: Some errors auto-clear when conditions normalize (e.g., flow restored, temperature recovered). Others require addressing the root cause. Never bypass safety features. If errors persist after basic troubleshooting, contact qualified service technician.

Q: What maintenance can I do myself? A: You can: (1) Clean evaporator fins with vacuum and soft brush quarterly, (2) Monitor and clean pool filter, (3) Check water chemistry, (4) Clear debris from around unit, (5) Verify settings and schedules. All refrigerant work, electrical repairs, and internal component service must be done by qualified professionals.

Q: How do I winterize for off-season storage? A: See the Maintenance & Service section above for complete 4-step winterization process. Key points: disconnect power, close isolation valves, drain completely, protect openings, and cover with breathable material. If you want antifreeze protection for your pool, the heat pump must remain powered.

Water Chemistry & Compatibility

Q: Can I use salt chlorination? A: Yes, the Megaline Fi 35 is fully compatible with salt chlorination systems. The titanium heat exchanger is highly resistant to salt water corrosion. Ensure pH is maintained between 6.9-8.0 and salt levels follow manufacturer recommendations (typically 3000-4000 ppm).

Q: What if my pH is outside the 6.9-8.0 range? A: Low pH (acidic) can cause corrosion even to titanium. High pH causes scale buildup that reduces efficiency and damages equipment. Maintain proper pH through regular testing and adjustment using pH increaser/decreaser chemicals. Out-of-range pH can void warranty.

Q: Will chlorine damage the heat exchanger? A: No, when properly managed. Maintain free chlorine at 1-3 ppm. Avoid shocking the pool with heat pump running – either turn off heat pump during shocking or shock at night when heat pump cycles off naturally. Always install chemical dosing equipment AFTER the heat pump in the hydraulic circuit.

Q: Can I use it with a spa or hot tub? A: The Megaline Fi 35 is designed for swimming pools (15-40°C). While it can heat water above 40°C, this is outside normal operating parameters and efficiency drops significantly. For dedicated spa heating above 40°C, consider specialized spa heat pumps or traditional heaters.

🎯 Ideal Applications

Perfect For:

✅ Hotel & Resort Pools

• Maintain guest comfort with consistent temperatures
• WiFi control allows remote management
• Quiet operation won’t disturb guests
• Extended season operation maximizes ROI

✅ Municipal & Public Pools

• Robust construction for heavy-duty use
• Low operating costs reduce municipal budgets
• Large capacity handles high bather loads
• Multiple units can be combined for very large pools

✅ Sports & Leisure Centres

• Reliable performance for training schedules
• Precise temperature control for competitive standards
• Easy maintenance fits facility schedules
• Energy efficiency reduces operational overhead

✅ School Swimming Pools

• Safe, reliable heating for educational programs
• Minimal maintenance requirements
• Extended season allows year-round curriculum
• Reduced costs free budget for other programs

✅ Therapy & Rehabilitation Pools

• Precise temperature control for therapeutic requirements
• Reliable operation critical for treatment schedules
• Quiet performance suitable for medical environments
• Can maintain higher temperatures (up to 40°C)

✅ Large Private Pools

• Powerful enough for substantial residential installations
• WiFi control convenience for homeowners
• Extended season enjoyment of investment
• Commercial-grade reliability for peace of mind

Also Suitable For:

✅ Boutique hotels and B&Bs with pool facilities ✅ Private clubs and member facilities ✅ Caravan parks and holiday sites ✅ Retirement communities and senior living facilities ✅ Physiotherapy clinics with aquatic therapy ✅ Dog training facilities with swimming pools ✅ Film/photography studios with pool sets

📦 What’s Included

In The Box:

• Poolex Megaline Fi 35 Heat Pump (fully assembled)
• Installation & User Manual (English)
• WiFi Quick Start Guide
• Warranty Registration Card
• Drain Plug and Seals
• Water Connection Adapters (63mm)
• Mounting Hardware Kit

Not Included (Required Separately):

• By-Pass valve assembly (3-valve kit)
• PVC piping and fittings for hydraulic connection
• Electrical cable (RO2V 5 × 4mm²)
• Circuit breaker (32A D-curve)
• Vibration isolation pads (recommended)
• Solar/thermal pool cover (highly recommended)
• Professional installation service

⚠️ Important Notes & Disclaimers

Installation:

• Must be installed by qualified professional in accordance with local building codes and regulations
• Improper installation voids warranty and can cause equipment damage or safety hazards
• Three-phase electrical supply required

Performance:

• All heating capacity and COP figures based on laboratory testing under specific conditions
• Real-world performance varies with ambient temperature, humidity, water temperature, altitude, and installation quality
• Heat-up times are theoretical estimates; actual times depend on multiple variables including heat loss rate

Water Chemistry:

• pH MUST be maintained between 6.9-8.0 to prevent corrosion and scale buildup
• Regular water testing and adjustment essential
• Chemical dosing equipment must be installed downstream of heat pump
• Improper water chemistry can void warranty

Antifreeze Protection:

• Heat pump must remain powered year-round for antifreeze systems to function
• In regions with extreme cold, consider supplementary heating or winterization
• Frozen heat exchanger not covered under warranty

Noise:

• Noise levels measured under laboratory conditions at specified distances
• Real-world noise perception varies with background noise, reflective surfaces, and prevailing conditions
• Consider neighbour proximity when planning installation location

Warranty:

• Register product online within 30 days of installation
• Requires proof of purchase and professional installation certificate
• Does not cover damage from improper installation, water chemistry, freezing, or unauthorized modifications
• Labour costs covered for first 3 years only

Energy Savings:

• Savings calculations are estimates based on specific assumptions
• Actual savings depend on: electricity tariffs, usage patterns, climate, pool insulation, cover usage, and heating alternatives
• Results vary significantly between installations

🏆 Why Buy From Parts4Tubs?

 ✅ Expert Advice – Our team understands commercial pool heating ✅ Professional Support – Technical assistance throughout installation and operation ✅ Quality Assurance – All products tested before dispatch ✅ Fast Delivery – Quick shipping across the UK ✅ After-Sales Service – Ongoing support for the life of your product

📞 Need Help Choosing?

Not sure if the Megaline Fi 35 is right for your application? Our pool heating specialists can help!

Contact us for:

• Pool sizing calculations and heat loss assessments
• Custom system design for multi-pool facilities
• Multiple heat pump configurations
• Bespoke commercial installations
• Integration with existing building management systems
• Energy consumption projections
• ROI and payback analysis

🌟 Technical Summary

The Poolex Megaline Fi 35 represents the pinnacle of commercial pool heating technology. Combining advanced full inverter technology, robust stainless steel construction, intelligent WiFi control, and exceptional energy efficiency, it delivers professional-grade performance with operational simplicity.

With COP ratings up to 11.46, operating range down to -15°C, and whisper-quiet performance at just 47dB, the Megaline Fi 35 sets new standards for commercial pool heat pumps. Whether you’re heating a busy municipal facility, luxury hotel pool, or large private installation, this heat pump provides the reliability, efficiency, and longevity that commercial operations demand.

Backed by comprehensive 3/7/15-year warranty coverage and the proven reliability of Mitsubishi components, the Megaline Fi 35 is an investment in sustainable, cost-effective pool heating that will deliver value for years to come.

Ready to transform your pool heating system? Add the Poolex Megaline Fi 35 to your cart today and discover commercial-grade performance that pays for itself.