🌡️ Fairland InverX20 X20-18 – 18.5kW 1 Phase Inverter Heat Pump for Large Pools

Engineered for Maximum Performance – Ultra-Silent, Energy-Efficient, and Built to Heat Your Pool All Year Round

Transform your large swimming pool into a year-round oasis with the Fairland InverX20 X20-18, the most powerful single-phase heat pump in the revolutionary InverX20 range. Delivering an impressive 18.5 kW of heating power in Turbo Mode, this premium heat pump combines cutting-edge TurboSilence® full-inverter technology with exceptional energy efficiency to provide fast, quiet, and reliable pool heating even in extreme conditions down to –20°C.

Designed for discerning pool owners with larger residential pools (up to 75 m³), the X20-18 doesn’t just heat your water—it revolutionizes your swimming experience with intelligent operating modes, whisper-quiet performance, and industry-leading warranties that protect your investment for decades.

🎯 Why Choose the Fairland InverX20 X20-18?

✅ Most Powerful Single-Phase Unit Available

With 18.5 kW Turbo Mode capacity (120% rated power), the X20-18 delivers the fastest heating times in its class, getting your pool to the perfect temperature quickly—even during cooler weather.

✅ 20X Quieter Than Standard Heat Pumps

Experience near-silent operation with noise levels as low as 22 dB(A) at 10 meters—quieter than a whisper. The TurboSilence® technology ensures your backyard remains a peaceful sanctuary, not a noisy industrial zone.

✅ Extreme Climate Performance

Unlike conventional heat pumps that struggle in cold weather, the X20-18 operates reliably from –20°C to +43°C, making it perfect for year-round swimming in virtually any climate.

✅ Extraordinary Energy Efficiency

With a Coefficient of Performance (COP) up to 20.5 in optimal conditions and an average seasonal COP exceeding 15, this heat pump can generate up to £20 of heat for every £1 of electricity—slashing your pool heating costs dramatically.

✅ Industry-Leading Warranty Coverage

• 15 Years on Titanium Heat Exchanger
• 15 Years on Mitsubishi Compressor
• 7 Years on All Other Parts

This isn’t just confidence in quality—it’s a guarantee of long-term reliability.

📋 Complete Technical Specifications

Specification	Details
Model	InverX20 X20-18
Heating Capacity (Turbo Mode)	18.5 kW @ Air 26°C / Water 26°C
Heating Capacity (Smart Mode)	16.0 kW @ Air 26°C / Water 26°C
Advised Pool Volume	40 – 65 m³ (ideal range) up to 75 m³
COP Range	7.0 – 20.5 (Seasonal Average >15)
COP @ 50% Load	15.0
COP @ 20% Load	20.9
Heating @ Air 15°C	12.0 kW (Turbo), 10.2 kW (Smart)
COP @ Air 15°C	5.2 – 8.9
Heating @ Air 7°C	10.5 kW (Turbo)
COP @ Air 7°C	4.5 – 7.1
Power Input Range	0.22 – 2.6 kW
Input Current Range	0.95 – 11.4 A
Maximum Input Current	16.5 A
Noise Level @ 1m Distance	42.0 – 48.0 dB(A)
Noise Level @ 10m Distance	22.0 – 28.0 dB(A)
Recommended Water Flow	5 – 7 m³/h
Water Connection Size	Ø 50 mm
Power Supply	230V / 1 Phase / 50Hz
Operating Temperature Range	–20°C to +43°C
Heat Exchanger Type	3D Titanium Spiral (30% increased efficiency)
Compressor	Mitsubishi DC Inverter Twin-Rotor
Cabinet Material	Anti-UV Aluminum-Alloy Hexagon Casing
Dimensions (L × W × H)	1045 × 432 × 660 mm
Net Weight	73 kg
Electrical Protection	Required breaker: 20A, Residual current: 30mA
Power Cable Specification	3 × 2.5 mm²
Certifications	CE, EMC, RoHS Compliant, TÜV Rheinland Tested
Warranty	7 Years (All Parts), 15 Years (Compressor & Heat Exchanger)

🔥 Advanced Features & Benefits

TurboSilence® Full-Inverter Technology

The heart of the X20-18’s exceptional performance lies in Fairland’s proprietary TurboSilence® system, which intelligently controls both the compressor and fan speeds to deliver:

• Dynamic Speed Control: Automatically adjusts from 20% to 120% capacity based on your pool’s exact heating needs
• Optimized Energy Consumption: Runs at lower speeds when maintaining temperature, maximizing efficiency
• Whisper-Quiet Operation: Variable speed technology eliminates the noisy on/off cycling of conventional heat pumps
• Extended Equipment Life: Smooth operation reduces mechanical stress and wear

Three Intelligent Operating Modes

🚀 Turbo Mode (100-120% Capacity)

• Perfect for rapid heating when you need quick results
• Ideal for the start of swimming season or after pool refills
• Boosts heating capacity to 18.5 kW for fastest warm-up times
• Intelligently optimizes performance based on ambient conditions

🧠 Smart Mode (20-100% Capacity) – Recommended

• Balanced operation for everyday use
• Automatically adjusts output for optimal efficiency
• Best choice for maintaining comfortable swimming temperatures
• Delivers 16.0 kW heating capacity with excellent energy savings

🔇 Silence Mode (20-60% Capacity)

• Ultra-quiet operation for nighttime heating
• Minimal noise output for peaceful outdoor living
• Maintains pool temperature without disturbing neighbors
• Perfect for noise-sensitive residential areas

📄 Downloads & Documentation

Installation & User Manual 📥

📄 Download Complete InverX20 Manual (PDF) (opens in new tab)

This comprehensive manual includes:

• For Users: Operating instructions, control panel guide, mode selection, temperature settings, WiFi setup, daily maintenance, and winterizing procedures
• For Installers: Detailed installation instructions, location requirements, clearance specifications, electrical wiring diagrams (230V and 400V), plumbing connections, and troubleshooting guide
• Technical Specifications: Complete performance data at various ambient temperatures, electrical requirements, water flow specifications, and dimensions
• Safety Information: Important warnings, transportation guidelines, and professional installation requirements
• Appendices: Heating priority wiring diagrams, failure codes, and advanced settings

Professional installation strongly recommended. This manual should be reviewed by your installer before beginning installation.

🏊 Pool Sizing & Performance Guide

Recommended Pool Volumes

Pool Size	Suitability	Expected Performance
40 – 50 m³	✅ Ideal	Excellent heating speed, optimal efficiency
51 – 65 m³	✅ Recommended	Fast heating, great energy efficiency
66 – 75 m³	⚠️ Maximum	Adequate heating, may require longer heat-up times

💡 Important Note: Pool sizing recommendations assume:

• Pool covered with an insulated cover when not in use
• Filtration system running at least 12-15 hours daily
• Reasonable wind protection and sheltered location
• Temperate climate conditions

⏱️ Estimated Heat-Up Times

These calculations are estimates based on theoretical performance. Actual heat-up times will vary based on pool insulation, ambient temperature, wind exposure, starting water temperature, and whether a pool cover is used.

Heat-Up Time Calculator (From 15°C to 28°C)

Pool Volume	Temperature Rise	Estimated Time (Turbo Mode @ 15°C Air)	Estimated Time (Smart Mode @ 15°C Air)
40 m³	13°C	50 hours	59 hours
50 m³	13°C	62 hours	74 hours
60 m³	13°C	75 hours	89 hours
65 m³	13°C	81 hours	97 hours
75 m³	13°C	93 hours	111 hours

Heat-Up Time Calculator (From 20°C to 28°C)

Pool Volume	Temperature Rise	Estimated Time (Turbo Mode @ 15°C Air)	Estimated Time (Smart Mode @ 15°C Air)
40 m³	8°C	31 hours	36 hours
50 m³	8°C	38 hours	46 hours
60 m³	8°C	46 hours	55 hours
65 m³	8°C	50 hours	59 hours
75 m³	8°C	57 hours	68 hours

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

⚠️ Disclaimer: These are theoretical estimates only. Real-world heat-up times can vary by ±30% or more depending on:

• Starting water and ambient temperatures
• Pool insulation quality and cover usage
• Wind exposure and weather conditions
• Pool location (sheltered vs. exposed)
• Water circulation efficiency
• Heat loss through pool surfaces

For fastest results, always use a quality pool cover when the pool is not in use.

💰 Running Cost Comparison

Annual Operating Cost Estimates (based on typical UK energy prices)

Assuming:

• Pool volume: 50 m³
• Heating season: April to September (6 months)
• Target temperature: 28°C
• Average ambient temperature: 15°C
• Electricity cost: £0.28/kWh
• Pool covered when not in use

Heating Method	Average Power Draw	Annual Energy Use	Estimated Annual Cost
X20-18 Inverter Heat Pump	1.4 kW (avg COP 7.3)	3,500 kWh	£980
Standard On/Off Heat Pump	2.2 kW (avg COP 4.5)	5,500 kWh	£1,540
Electric Heater	15 kW	24,000 kWh	£6,720
Gas Boiler	25 kW	8,500 kWh	£2,890*

*Gas pricing at £0.34/kWh equivalent

💡 Potential Savings:

• £560/year vs. standard heat pump
• £5,740/year vs. electric heating
• £1,910/year vs. gas heating

🛠️ Installation Requirements & Clearances

Minimum Clearance Distances

Location	Minimum Distance
Air Outlet (Front)	3000 mm (3 meters) clear space
Air Inlet (Rear)	300 mm minimum
Sides (Left & Right)	500 mm minimum for service access
Top	2000 mm clearance recommended
Between Multiple Units	2000 mm separation

Installation Best Practices

✅ DO:

• Install on solid, level concrete foundation or heavy-duty anti-vibration pads
• Secure with M10 bolts to prevent movement
• Position in well-ventilated area with good air circulation
• Install drainage for condensation water discharge
• Use hard piping (not flexible hose) for water connections
• Keep pipe runs between pool and heat pump under 10 meters
• Install by qualified professional with heat pump experience
• Provide dedicated electrical circuit with appropriate breaker (20A)
• Install upstream and downstream isolation valves for servicing

❌ DON’T:

• Install in enclosed spaces or indoors without adequate ventilation
• Position where exhaust air can recirculate back to air inlet
• Support water unions with weight of connected pipes
• Install in direct path of prevailing winds
• Place near sources of chemical fumes or corrosive materials
• Install where condensation drainage could cause problems

Electrical Requirements

• Power Supply: 230V / 1 Phase / 50Hz
• Circuit Breaker: 20A rated current
• Residual Current Device (RCD): 30mA maximum leakage
• Power Cable: Minimum 3 × 2.5 mm² (for runs up to 5m)
• Cable Sizing: Increase cable size for longer runs or voltage drop concerns
• Earth Connection: Proper earth bonding is critical for safety

⚠️ Important: Professional installation is strongly recommended. DIY installation may void warranty and create safety hazards.

🌡️ Seasonal Performance Expectations

Performance at Different Ambient Temperatures

Ambient Temp	Heating Output (Turbo)	COP	Efficiency Rating
26°C (Summer)	18.5 kW	7.7 – 20.9	⭐⭐⭐⭐⭐ Exceptional
15°C (Spring/Autumn)	12.5 kW	5.1 – 8.9	⭐⭐⭐⭐ Excellent
7°C (Cool Weather)	10.5 kW	4.4 – 7.1	⭐⭐⭐ Good
0°C (Near Freezing)	8.0 kW*	3.5 – 5.5*	⭐⭐ Adequate
-15°C (Extreme Cold)	5.0 kW*	2.8 – 4.0*	⭐ Basic Function

*Estimated values based on performance curve data

💡 Real-World Insight: The X20-18 truly shines during the core swimming season (15°C – 26°C ambient) when most pool heating occurs. At these temperatures, you’ll experience outstanding efficiency and rapid heating. Even in cooler shoulder seasons, it continues to perform admirably—far exceeding standard heat pumps that struggle below 10°C.

🔧 Premium Component Engineering

3D Spiral Titanium Heat Exchanger

• 30% larger surface area than conventional heat exchangers
• Pure titanium construction resists corrosion from pool chemicals and salt water
• Spiral design maximizes heat transfer efficiency
• 15-year warranty demonstrates exceptional durability
• Compatible with all pool sanitization systems

Mitsubishi Twin-Rotary DC Inverter Compressor

• Premium Japanese-engineered compressor for maximum reliability
• Twin-rotary design delivers smooth, vibration-free operation
• DC inverter technology enables precise speed control (20-120%)
• Extremely efficient across entire operating range
• 15-year warranty on this critical component

Anti-UV Aluminum-Alloy Hexagon Casing

• Aerospace-grade aluminum construction for superior durability
• UV-resistant powder coating prevents fading and degradation
• Hexagon design enhances structural rigidity
• Weather-resistant in all climates
• Corrosion-proof for coastal installations

📱 Smart Control & Connectivity

Built-in WiFi & Mobile App Control

• Remote Access: Control your heat pump from anywhere in the world
• Real-Time Monitoring: Check water temperature, heating status, and power consumption
• Scheduling: Set heating schedules to optimize energy usage
• Family Sharing: Multiple users can access and control the system
• Push Notifications: Receive alerts for temperature targets reached or system faults
• Energy Tracking: Monitor electricity consumption in real-time (single-phase models)

Digital LCD Touchscreen Controller

• Large, easy-to-read display shows all critical information
• Touch-sensitive controls with intuitive interface
• Displays inlet/outlet water temperatures
• Shows current operating mode and heating capacity percentage
• Temperature adjustable from 18°C to 40°C in heating mode
• Screen auto-locks after 30 seconds to prevent accidental changes
• Built-in diagnostics display fault codes for easy troubleshooting

🛡️ Comprehensive Safety Features

Your safety and the protection of your investment are paramount. The X20-18 includes multiple layers of protection:

Water Protection Systems:

• ✅ Flow detection system prevents dry running
• ✅ No-water protection shuts down unit if flow stops
• ✅ Insufficient water flow protection
• ✅ Water outlet temperature monitoring (high/low protection)
• ✅ Freeze protection in low temperatures with automatic shutdown

Electrical Safety:

• ✅ Electric leakage safety cutoff
• ✅ Power supply excursion protection
• ✅ Phase loss protection (3-phase models)
• ✅ Over-current protection
• ✅ Auto-restart after power loss

Mechanical Protection:

• ✅ High refrigerant pressure protection
• ✅ Low refrigerant pressure protection
• ✅ Compressor overheating protection
• ✅ Exhaust temperature monitoring
• ✅ Evaporator overheat protection
• ✅ Inverter board thermal protection

Defrost Systems:

• ✅ Automatic hot gas defrost system
• ✅ Manual compulsory defrost option
• ✅ Anti-freeze operation down to –20°C

❓ Frequently Asked Questions

How long does it take to heat my pool?

Heat-up time depends on several factors: pool volume, starting water temperature, target temperature, ambient air temperature, and whether you use a pool cover.

For a typical 50 m³ pool starting at 15°C and heating to 28°C (13°C rise) in 15°C ambient weather:

• Turbo Mode: Approximately 62 hours (2.6 days)
• Smart Mode: Approximately 74 hours (3.1 days)

These times improve significantly with warmer air temperatures and use of a quality pool cover. See our detailed heat-up tables above for more scenarios.

What size pool is the X20-18 suitable for?

The X20-18 is designed for larger residential pools:

• Ideal Range: 40 – 65 m³ (excellent performance)
• Maximum Capacity: Up to 75 m³ (adequate performance with longer heat-up times)

Pool sizing assumes proper insulation, regular cover use, and temperate climate conditions.

How much does it cost to run?

Running costs vary based on pool size, target temperature, climate, and electricity rates. For a typical 50 m³ pool in the UK during a 6-month heating season (April-September), expect approximately £980/year at current electricity rates (£0.28/kWh).

This represents savings of:

• £560/year vs. standard heat pumps
• £5,740/year vs. electric resistance heating
• £1,910/year vs. gas heating

How quiet is this heat pump really?

The X20-18 is exceptionally quiet:

• At 1 meter: 42-48 dB(A) – similar to a quiet library
• At 10 meters: 22-28 dB(A) – quieter than whispering
• In Silence Mode: Even quieter for nighttime operation

This is approximately 20 times quieter than conventional on/off heat pumps, making it ideal for residential neighborhoods and noise-sensitive areas.

Will it work in cold weather?

Yes! The X20-18 operates reliably down to –20°C ambient temperature—far beyond most heat pumps. While heating capacity decreases at lower temperatures (as with all heat pumps), it continues functioning when others fail.

Performance examples:

• 15°C ambient: 12.5 kW output (excellent)
• 7°C ambient: 10.5 kW output (very good)
• 0°C ambient: ~8 kW output (adequate)
• –20°C ambient: Continues operating (basic heating maintained)

What warranty is included?

Industry-leading coverage:

• 15 Years on Titanium Heat Exchanger
• 15 Years on Mitsubishi Compressor
• 7 Years on All Other Components

This comprehensive warranty demonstrates Fairland’s confidence in the X20-18’s long-term reliability and protects your investment for over a decade.

Can I install this myself?

While technically capable DIYers might be tempted, professional installation is strongly recommended for several important reasons:

• Electrical work requires qualified electrician (regulations compliance)
• Proper refrigerant handling requires certification
• Incorrect installation can void warranty
• Safety considerations (electrical, plumbing, structural)
• Optimal performance requires proper sizing, positioning, and configuration

Professional installers have the experience, tools, and knowledge to ensure safe, efficient installation.

Does it require a three-phase power supply?

No! The X20-18 operates on standard 230V single-phase power, making it suitable for most residential properties without expensive electrical upgrades. It requires a dedicated 20A circuit breaker and should be hard-wired (no plug connection).

Three-phase models are available in the X20 range (X20-32T, X20-40T) for commercial applications.

What maintenance does it require?

The X20-18 is designed for minimal maintenance:

User Maintenance:

• Clean exterior casing occasionally with mild detergent
• Ensure air inlet/outlet remain clear of obstructions
• Check for proper water flow regularly
• Drain unit before winter if not using (cold climates)

Professional Maintenance (Annually):

• Inspect electrical connections
• Check refrigerant levels
• Clean evaporator coils if necessary
• Verify correct operation of all safety systems
• Test defrost cycles

Winterizing: If not using during winter, drain all water from the unit to prevent freeze damage.

What’s the difference between Turbo, Smart, and Silence modes?

🚀 Turbo Mode (100-120% capacity):

• Maximum heating power (18.5 kW)
• Fastest warm-up times
• Higher noise level (still quiet at 42-48 dB(A))
• Best for rapid temperature increase
• Uses more power for maximum output

🧠 Smart Mode (20-100% capacity) – Recommended:

• Balanced performance (16.0 kW nominal)
• Excellent efficiency
• Moderate noise levels
• Automatically adjusts to conditions
• Best all-around choice for daily use

🔇 Silence Mode (20-60% capacity):

• Ultra-quiet operation
• Reduced heating power
• Perfect for nighttime
• Ideal for noise-sensitive locations
• Most energy-efficient for maintaining temperature

Will it work with salt water pools?

Absolutely! The titanium heat exchanger is specifically chosen for its exceptional resistance to corrosion from salt water, chlorine, and other pool chemicals. Titanium is the gold standard for pool heat exchangers and will not degrade even in harsh salt water environments.

How does the COP of 20.5 work? Is that real?

Yes, but with important context. The COP (Coefficient of Performance) of 20.5 is achievable under optimal conditions at very low loads (20% capacity) with warm ambient temperatures (26°C+) and is more of a peak efficiency measurement.

Real-world COPs you’ll experience:

• Optimal conditions (26°C air): COP 7.7 – 20.9 (average ~15)
• Spring/Autumn (15°C air): COP 5.1 – 8.9 (average ~7)
• Cool weather (7°C air): COP 4.4 – 7.1 (average ~5.5)

Even the “real-world” COPs are exceptional—meaning for every 1 kW of electricity consumed, you’re generating 5-15 kW of heat output, depending on conditions.

What’s included in the box?

• X20-18 Heat Pump Unit (fully assembled)
• Water unions (inlet/outlet connections)
• Drainage tube for condensation
• Installation & User Manual
• Warranty registration information

Not Included (purchased separately):

• Water pump (if you don’t already have one)
• Hard pipe connections
• Electrical breaker and wiring
• Concrete pad or mounting base
• Pool cover (highly recommended)

🎖️ Why Parts4Tubs for Your Heat Pump Purchase?

When you choose to purchase your Fairland InverX20 X20-18 from Parts4Tubs, you’re not just buying a heat pump—you’re gaining a trusted partner committed to your satisfaction:

✅ Expert Knowledge & Support

• Specialist advice from pool heating professionals
• Technical support for sizing and installation questions
• Years of experience with heat pump installations

✅ Competitive Pricing

• Transparent pricing with no hidden fees
• Regular promotions and special offers
• Price match considerations

✅ Fast, Reliable Delivery

• Careful packaging to prevent transit damage
• Tracking provided for peace of mind
• Delivery to your door or installation site

✅ After-Sales Care

• Warranty support and registration assistance
• Access to spare parts if ever needed
• Ongoing technical advice

✅ Customer Satisfaction Focus

• Built on the success of BuildAHotTub.com
• Real reviews from real customers
• Commitment to resolving any issues promptly

🌟 Transform Your Swimming Experience Today

The Fairland InverX20 X20-18 represents the pinnacle of residential pool heating technology. With its combination of powerful heating capacity, extraordinary energy efficiency, whisper-quiet operation, and bulletproof reliability, it’s the smart choice for discerning pool owners who demand the best.

Stop settling for cold water, high energy bills, and noisy equipment. Upgrade to the X20-18 and enjoy:

• 💰 Dramatic energy savings vs. conventional heating methods
• 🏊 Comfortable swimming temperatures from spring through autumn
• 🔇 Peaceful outdoor living without intrusive noise
• 🛡️ Decades of reliable service backed by industry-leading warranties
• 🌍 Year-round operation even in extreme weather
• 📱 Smart control from anywhere in the world

Your perfect pool temperature is just one decision away.

⚙️ Technical Specifications Summary

Heating Performance:

• 18.5 kW Turbo Mode / 16.0 kW Smart Mode
• Pool capacity: 40-75 m³
• COP range: 4.5 – 20.9 depending on conditions
• Operating range: –20°C to +43°C

Physical Specifications:

• Dimensions: 1045 × 432 × 660 mm
• Weight: 73 kg
• Water connections: Ø 50 mm
• Required water flow: 5-7 m³/h

Electrical Requirements:

• Power: 230V / 1 Phase / 50Hz
• Circuit breaker: 20A
• Power input: 0.22 – 2.6 kW
• Max current: 16.5 A

Certifications & Warranty:

• CE, EMC, RoHS compliant
• TÜV Rheinland tested and certified
• 15-year warranty on compressor and heat exchanger
• 7-year warranty on all other parts

📞 Need Help Choosing?

Not sure if the X20-18 is the right heat pump for your pool? Our team is here to help!

Contact Us:

• Browse our complete range at Parts4Tubs.co.uk
• Email support for technical questions
• Consult our heat pump sizing guides
• Compare with other models in the InverX20 range

Other X20 Models to Consider:

• X20-16 (16 kW) – For pools 35-60 m³
• X20-14 (14 kW) – For pools 30-50 m³
• X20-22 (23.4 kW) – For pools 45-75 m³ (requires more powerful electrical supply)

Invest in Comfort. Invest in Efficiency. Invest in the Fairland InverX20 X20-18.