Pentair InverTemp-FL Heat Pump 45-55m³ 🌊 – Ultra-Quiet Full Inverter Pool Heating & Cooling System

Smart comfort, whisper-quiet efficiency, and reliable year-round performance for medium-sized pools.

The Pentair InverTemp-FL represents the pinnacle of pool heating technology, combining Full Inverter Technology with ultra-quiet operation to deliver exceptional comfort and efficiency. Designed specifically for pools between 45 and 55 cubic metres, this advanced heat pump adapts intelligently to maintain your ideal water temperature while minimizing energy consumption and noise.

Unlike traditional pool heaters, the InverTemp-FL continuously adjusts its compressor and fan speed to match your pool’s exact heating needs. This means you enjoy consistent comfort, impressive energy savings (up to 80% compared to traditional systems), and whisper-quiet operation at under 42 dB(A) – quieter than a normal conversation.

✅ Key Benefits at a Glance

• Ultra-Quiet Performance: <42 dB(A) certified sound level – perfect for residential settings
• Maximum Efficiency: Achieves up to 10.8 COP (Coefficient of Performance) in Eco Mode
• Smart Connectivity: Built-in WiFi with Smart Life app for remote control from anywhere
• Year-Round Operation: Functions reliably in temperatures from –15°C to +43°C
• Eco-Friendly: Uses R32 refrigerant with lower environmental impact
• Dual Functionality: Provides both heating AND cooling for complete comfort
• Premium Construction: Titanium heat exchanger with 10-year warranty
• Energy Savings: Reduce heating costs by up to 80% vs. traditional systems

📊 Pool Sizing & Heat-Up Time Estimates

Recommended Pool Volumes

This heat pump is optimally sized for pools between 45-55 cubic metres (45,000-55,000 litres). Using it with pools outside this range may result in inefficient operation or inadequate heating performance.

How to calculate your pool volume:

• Rectangular pools: Length (m) × Width (m) × Average Depth (m)
• Round pools: π × Radius² × Average Depth (m)
• Oval pools: π × (Length/2) × (Width/2) × Average Depth (m)

⏱ Estimated Heat-Up Times

The table below shows estimated times to heat various pool volumes using the InverTemp-FL in Boost Mode (10.6 kW). These are theoretical calculations based on ideal conditions.

Formula Used: Time (hours) = (Pool Volume in m³ × Temperature Rise in °C × 1.16) ÷ 10.6 kW

Pool Volume	5°C Rise	10°C Rise	15°C Rise	20°C Rise
45 m³	24 hours	49 hours	74 hours	98 hours
50 m³	27 hours	55 hours	82 hours	109 hours
55 m³	30 hours	60 hours	90 hours	120 hours

⚠ Important Disclaimers:

These are theoretical estimates only. Actual heat-up times will vary significantly based on:

• Ambient air temperature (heat pumps work slower in cold weather)
• Wind exposure and weather conditions
• Pool location (sun exposure vs. shade)
• Whether the pool is covered (uncovered pools lose 4× more heat)
• Starting water temperature
• Heat losses during the heating period
• Selected operating mode (Boost/Smart/Eco)

💡 Pro Tips for Faster Heating:

• Always use a pool cover – This is the single most important factor! An uncovered pool loses 4 times more energy than a covered pool
• Start heating early in the season when temperature differences are smaller
• Run in Boost Mode for initial heat-up, then switch to Smart or Eco Mode for maintenance
• Ensure proper water flow (5-7 m³/h) for optimal heat transfer
• Position the unit where it receives good airflow and isn’t blocked by obstacles

📄 Downloads & Documentation

Complete Installation & Operating Manual

📄 Pentair InverTemp-FL Heat Pump Manual (PDF) (opens in new tab)

This comprehensive 24-page manual includes:

• Safety Instructions: Important warnings and operational guidelines
• Technical Specifications: Complete performance data for all operating modes
• Installation Guide: Site requirements, spacing, hydraulic connections, and electrical wiring diagrams
• Operating Instructions: Step-by-step setup, adjustment procedures, and water flow optimization
• WiFi Setup: Detailed instructions for connecting to the Smart Life app
• Maintenance Schedule: Cleaning procedures, winterization steps, and yearly checks
• Troubleshooting: Complete error code list with solutions
• Circuit Diagrams: Full electrical schematics for single-phase and three-phase models
• Component Breakdown: Detailed parts list with exploded view diagrams

Size: PDF document | Language: English (Also available in FR, DE, IT, ES, NL, PT on manufacturer website)

🔧 Advanced Features & Technology

Full Inverter Technology Explained

The InverTemp-FL uses dual inverter technology – both the compressor AND the fan operate with variable speed control. This means:

• Precise Temperature Control: The system adjusts power output in real-time to maintain your exact target temperature
• Energy Efficiency: Only uses the power needed at any given moment – no wasteful on/off cycling
• Reduced Wear: Smooth operation without frequent starts and stops extends component lifespan
• Quieter Operation: Variable speed means the system can run at lower, quieter speeds most of the time
• Better Cold Weather Performance: Can modulate down to maintain operation even at –15°C ambient temperature

Three Intelligent Operating Modes

🌿 ECO SILENT MODE (Most Economical & Quietest)

• Power Range: 3.9 – 7.1 kW (30-60% capacity)
• COP: 8.3 – 10.8 (exceptional efficiency)
• Best For: Maintaining temperature once pool is heated, overnight operation, noise-sensitive areas
• Operation: Prioritizes energy efficiency and low noise – fan runs at minimum speed while compressor optimizes for best COP

🧠 SMART MODE (Intelligent Auto-Adjust)

• Power Range: 3.9 – 10.6 kW (30-100% capacity)
• COP: 5.4 – 10.8 (automatically optimized)
• Best For: Daily operation, varying weather conditions, automatic seasonal adjustment
• Operation: Automatically balances power output and efficiency based on ambient temperature and water temperature difference

⚡ BOOST MODE (Maximum Power)

• Power Range: 10.6 kW (85-100% capacity)
• COP: 5.4 – 6.8 (still highly efficient)
• Best For: Initial pool heat-up, rapid temperature recovery after cooler weather, early season heating
• Operation: Delivers maximum heating power to raise temperature as quickly as possible

Smart Connectivity & Remote Control

Built-in WiFi with Smart Life App (iOS & Android)

Control your pool heating from anywhere:

• ✅ Monitor current water temperature in real-time
• ✅ Adjust target temperature remotely
• ✅ Switch between operating modes
• ✅ Set heating schedules and timers
• ✅ Receive alerts and error notifications
• ✅ View energy consumption data
• ✅ Check system status and performance

Professional Integration Options

Compatible with Pentair automation systems:

• Speedeo® pool automation
• Soleo® VS variable speed systems
• Intellipool® control systems (via Modbus RS485)

📐 Complete Technical Specifications

Performance Specifications

Specification	Detail
Recommended Pool Size	45–55 m³ (45,000-55,000 litres)
Heating Capacity (Boost Mode)	10.6 kW
COP (Boost Mode @ 28°C)	5.4 – 6.8
Heating Capacity (Smart Mode)	3.9 – 10.6 kW (variable)
COP (Smart Mode @ 28°C)	5.4 – 10.8
Heating Capacity (Eco Mode)	3.9 – 7.1 kW
COP (Eco Mode @ 28°C)	8.3 – 10.8 (exceptional!)
Heating Capacity @ 15°C Air	7.8 kW
COP @ 15°C Air	4.9 – 5.2
Heating Capacity @ –7°C Air	4.65 kW
COP @ –7°C Air	3.96
Operating Temperature Range	–15°C to +43°C ambient
Maximum Water Temperature	45°C

Power & Electrical Specifications

Specification	Detail
Power Supply	230V~, Single Phase, 50Hz
Maximum Power Consumption	2.7 kW
Fuse Rating	16A (Type C circuit breaker)
Power Cable Cross Section	3G 2.5mm² (up to 25m run)
IP Rating	IPX4 (splash-proof)
Residual Current Protection	30mA RCD required

Physical & Construction Specifications

Specification	Detail
Dimensions (mm)	Width: 657mm, Depth: 977mm, Height: 397mm
Weight	43 kg (net)
Noise Level	<42 dB(A) @ 10m (Eco Mode, certified)
Compressor Type	Mitsubishi/Toshiba 2D Full DC Inverter
Refrigerant	R32 (675 GWP) – 1.4 kg charge
Heat Exchanger	Titanium (corrosion-resistant)
Cabinet Material	Reinforced ABS with UV protection + soundproof panels
Hydraulic Connections	50mm (1.5″) PVC unions (included)
Minimum Water Flow	5 m³/h (83 litres/min)
Recommended Water Flow	5-7 m³/h (83-117 litres/min)

Control & Interface

Specification	Detail
Control Interface	WiFi-enabled TFT colour touchscreen
Remote Control	Smart Life app (iOS & Android)
Automation Compatible	Modbus RS485 (Pentair systems)
Dry Contact Input	For external ON/OFF control
Relay Output	For filtration pump control (P1-P2 terminals)

Warranty & Compliance

Specification	Detail
Parts Warranty	3 years (manufacturer warranty)
Heat Exchanger Warranty	10 years (titanium component)
Safety Standards	EN 60335-1:2012, EN 60335-2-40:2003, EN 62233:2008
EMC Standards	EN 55014-1:2017, EN 55014-2:2015
Environmental Compliance	RoHS 2011/65/EU, WEEE 2012/19/EU
Refrigerant Regulations	EU 517/2014 compliant (F-Gas certified)

🌡 Real-World Performance & Operating Costs

Performance at Different Air Temperatures

Understanding how air temperature affects performance helps you plan heating schedules:

Air Temperature	Heating Output	COP	Expected Performance
28°C (Ideal)	10.6 kW	5.4-6.8	Peak performance – maximum efficiency
15°C (Spring/Autumn)	7.8 kW	4.9-5.2	Good performance – most UK conditions
7°C (Cool)	4.65 kW	3.96	Reduced output but still efficient
–7°C (Cold)	4.65 kW	3.96	Maintains operation with active defrost
–15°C (Minimum)	Variable	Variable	Minimum operating limit – reduced capacity

Estimated Running Costs

Based on 10.6 kW Boost Mode:

• Power consumption: 2.7 kW maximum
• UK average electricity cost: £0.24 per kWh (November 2024)
• Running cost: Approximately £0.65 per hour in Boost Mode
• Daily cost (8 hours): Approximately £5.20 in Boost Mode

💰 Cost Comparison vs. Alternative Heating Methods:

To heat a 50m³ pool by 10°C:

Heating Method	Energy Needed	Typical Cost	vs. InverTemp-FL
InverTemp-FL (COP 5.5)	~105 kWh electricity	£25-30	Baseline
Electric Heater	~580 kWh electricity	£139	5× more expensive
Gas Boiler	~73 kWh gas	£50-65	2× more expensive
Oil Boiler	~65L oil	£65-85	2.5× more expensive

Costs are approximate and vary with energy prices and pool conditions

🌿 Energy Savings:

Over a typical swimming season (May-September in UK), you could save:

• vs. Electric Heating: £800-1,200 per season
• vs. Gas Heating: £300-500 per season
• vs. Oil Heating: £400-700 per season

The InverTemp-FL typically pays for itself within 2-3 seasons through energy savings alone!

🛠 Installation Requirements

Site Requirements

Minimum Clearances:

• Front (fan outlet): 3m minimum open space – direct airflow away from pool and neighbors
• Sides & Rear (air intake): 1m minimum (30cm absolute minimum) – ensure unrestricted airflow
• Maintenance access: Leave sufficient space for servicing and cleaning

Base Requirements:

• Foundation: Solid, level concrete pad or reinforced surface
• Minimum slab dimensions: 1200mm × 650mm × 100mm (for this model)
• Mounting: Use provided vibration-absorbing feet/pads
• Drainage: Ensure condensate can drain away freely

Location Considerations:

✅ DO Install:

• At least 2m from pool edge (UK regulations NF C 15-100)
• In well-ventilated outdoor area with good airflow
• On stable surface capable of supporting 43kg weight
• Where condensate drainage is possible
• Away from children’s play areas

❌ DO NOT Install:

• Indoors or in poorly ventilated enclosures
• Under trees (falling leaves/debris)
• Where snow can accumulate
• In areas exposed to sprinklers or standing water
• Near flammable materials or chemicals
• Where noise could disturb neighbors
• Close to windows or outdoor living spaces

Hydraulic Connections

Required Components:

• 50mm (1.5″) PVC piping – included unions
• Bypass valve assembly for flow regulation (recommended)
• Filter system (must be installed BEFORE heat pump)
• Water treatment system (must be installed AFTER heat pump)

Connection Order:

Pool → Filter → InverTemp-FL Heat Pump → Water Treatment (Chlorinator/pH) → Pool

Water Flow Optimization:

• Target flow rate: 5-7 m³/h (83-117 litres/min)
• Use pressure gauge on unit to verify optimal flow
• Ideal pressure reading: 10-15°C above pool water temperature
• Adjust bypass valve to achieve correct flow rate

Electrical Requirements

⚡ Critical Electrical Information:

• Voltage: 230V~, 50Hz, Single Phase
• Circuit Protection: 16A Type C MCB (circuit breaker)
• RCD Protection: 30mA residual current device (mandatory)
• Cable: 3G 2.5mm² for runs up to 25m (increase size for longer runs)
• Earth Connection: Mandatory – proper grounding essential

Professional Installation Required:

All electrical connections MUST be performed by a qualified electrician in accordance with:

• BS 7671 (UK Wiring Regulations)
• Local building codes and swimming pool regulations
• Manufacturer specifications

Additional Wiring Options:

• Dry Contact Input (P1-P2): For remote ON/OFF control or timer
• Pump Control Output: Relay for forcing filtration when heating required
• Modbus RS485: For Pentair automation system integration

❓ Frequently Asked Questions

General Questions

Q: What size pool is this heat pump suitable for?

A: The InverTemp-FL is designed specifically for pools between 45-55 cubic metres (45,000-55,000 litres). This is approximately a pool measuring 10m × 4.5m × 1.0m average depth. Using it on significantly smaller or larger pools will result in inefficient operation.

Q: Can this heat pump cool my pool as well as heat it?

A: Yes! The InverTemp-FL offers both heating and cooling functions. This is particularly useful during hot summer periods to lower water temperature for comfortable swimming, or to prevent water from becoming too warm (which can encourage algae growth).

Q: How quiet is this heat pump in actual use?

A: The InverTemp-FL is certified at <42 dB(A) at 10 meters in Boost Mode – quieter than a normal conversation (50-60 dB). In Eco Silent Mode, it’s even quieter, making it ideal for residential settings where noise is a concern. The aerodynamic design and full inverter technology minimize sound and vibration.

Q: Will it work during British winters?

A: Yes! The InverTemp-FL operates in ambient temperatures as low as –15°C. However, performance decreases as temperature drops. At 15°C (typical UK spring/autumn), it delivers 7.8 kW with excellent efficiency. Even at –7°C, it maintains 4.65 kW output with a COP of 3.96. The active defrost system ensures reliable cold-weather operation.

Installation & Operation

Q: Can I install this heat pump myself?

A: No. Installation requires qualified professionals with skills in electricity, plumbing, and refrigeration. Incorrect installation voids the warranty and poses serious safety risks including electrocution and refrigerant leaks. A certified F-Gas technician is required for any work involving the refrigerant circuit.

Q: How much does it cost to run per day?

A: Running costs depend on the mode, air temperature, and pool conditions. In Boost Mode at maximum power (2.7 kW), running 8 hours per day costs approximately £5.20 (at £0.24/kWh UK average). In Eco Mode, costs are much lower. Once your pool reaches temperature, the heat pump runs less frequently, dramatically reducing daily costs.

Q: Do I need to cover my pool?

A: Absolutely essential! An uncovered pool loses 4 times more heat than a covered pool. Without a cover, your heat pump will struggle to maintain temperature and running costs will skyrocket. A simple bubble cover or thermal blanket makes an enormous difference – this is the single most important factor in efficient pool heating.

Q: How long does it take to heat my pool initially?

A: This varies dramatically based on pool volume, starting temperature, air temperature, and whether you use a cover. For a 50m³ pool, expect 2-5 days for a 10°C temperature rise under typical conditions. See the heat-up time table above for estimates, but remember actual times will vary significantly based on weather and pool conditions.

Technical Questions

Q: What is COP and why does it matter?

A: COP (Coefficient of Performance) measures efficiency. A COP of 5.5 means for every 1 kW of electricity used, you get 5.5 kW of heating – 550% efficiency! The InverTemp-FL achieves up to 10.8 COP in Eco Mode (1080% efficiency), making it one of the most efficient pool heating solutions available. Higher COP = lower running costs.

Q: What is Full Inverter Technology?

A: Full Inverter Technology means both the compressor AND fan have variable speed control. Traditional heat pumps run at fixed speeds, constantly turning on and off. The InverTemp-FL smoothly adjusts its power output to match your exact heating needs, resulting in better efficiency, quieter operation, more precise temperature control, and longer component life.

Q: What is R32 refrigerant and is it safe?

A: R32 is a next-generation refrigerant with 68% lower Global Warming Potential (GWP) than older refrigerants like R410A (675 vs 2088 GWP). It’s more environmentally friendly and delivers better heat transfer efficiency. It’s classified as A2L (mildly flammable), but is safe when properly installed and maintained by qualified technicians. The unit complies with all EU regulations (EU 517/2014).

Q: Why is a titanium heat exchanger important?

A: Titanium is highly resistant to corrosion from chlorine, salt, and other pool chemicals. Unlike stainless steel or nickel heat exchangers that can deteriorate over time, titanium maintains its integrity for decades. This is why Pentair offers a 10-year warranty on the titanium heat exchanger – it’s built to last.

Maintenance & Warranty

Q: What maintenance does this heat pump require?

A: Minimal! Regular maintenance includes:

• Monthly: Visual check of the unit and clearing any debris from air intakes
• Annually: Professional service including cleaning evaporator coils, checking refrigerant levels and electrical connections, and verifying optimal performance
• Seasonally: Proper winterization if you close your pool (draining the heat exchanger and protecting the unit)

Q: What warranty is included?

A: The InverTemp-FL comes with a 3-year warranty on parts and an exceptional 10-year warranty on the titanium heat exchanger. Warranty is valid from the purchase date and requires professional installation and annual maintenance by qualified technicians. F-Gas regulations require annual leak checks for environmental compliance.

Q: What happens if something goes wrong?

A: The unit features comprehensive diagnostic capabilities with clear error codes displayed on the touchscreen. The manual includes a complete troubleshooting guide. Most issues can be resolved quickly by checking water flow, cleaning filters, or verifying settings. For technical problems, qualified service technicians can access detailed diagnostics and the Modbus system for advanced troubleshooting.

Q: How do I winterize the heat pump?

A: If closing your pool for winter: (1) Power off the unit, (2) Close inlet and outlet valves, (3) Open bypass valve fully, (4) Unscrew hydraulic connections to drain ALL water from the heat exchanger, (5) Loosely reconnect unions to prevent debris entry, (6) Cover unit with provided winter blanket. Never leave water in the heat exchanger when freezing temperatures are possible – ice expansion can cause catastrophic damage not covered by warranty.

🎖 Why Pentair?

Pentair is a globally recognized leader in pool and water solutions with decades of engineering excellence. The InverTemp-FL represents their latest innovation in pool heating technology:

✅ Proven Reliability: Trusted by pool professionals worldwide
✅ Advanced Engineering: Cutting-edge inverter technology and smart controls
✅ Quality Components: Mitsubishi/Toshiba compressor, titanium heat exchanger
✅ Environmental Commitment: Eco-friendly R32 refrigerant, energy-efficient operation
✅ Comprehensive Support: Extensive documentation, professional installation network
✅ Long-Term Value: 3-year parts warranty plus 10-year heat exchanger warranty

🚀 Getting Started

Step 1: Pre-Installation

Before installation day:

1. Calculate your pool volume accurately to confirm this model is correctly sized
2. Prepare the installation site with a level concrete pad (1200mm × 650mm minimum)
3. Ensure your electrical supply meets requirements (230V, 16A circuit available)
4. Check local regulations regarding heat pump placement and distances from pool
5. Purchase any additional components needed (piping, bypass valve, circuit breaker)

Step 2: Professional Installation

You will need:

• Qualified electrician (for electrical connections)
• Plumber or pool technician (for hydraulic connections)
• F-Gas certified refrigeration engineer (if refrigerant work needed)

Installation typically takes 4-6 hours depending on site complexity.

Step 3: Commissioning & Setup

Your installer will:

1. Verify all connections are secure and leak-free
2. Check electrical connections and grounding
3. Pressure-test the refrigerant system
4. Set up water flow and adjust bypass valve
5. Configure WiFi and Smart Life app
6. Program your desired temperature and operating mode
7. Verify proper operation and provide user training

Step 4: Ongoing Operation

• Daily: Monitor temperature via app – the system is largely automatic
• Weekly: Visual check of the unit for debris or blockages
• Monthly: Clean pre-filter in filtration system
• Seasonally: Professional service and winterization (if applicable)
• Annually: Mandatory F-Gas leak check and professional maintenance

🌍 Environmental Benefits

Choosing the Pentair InverTemp-FL isn’t just good for your wallet – it’s good for the planet:

🌿 R32 Refrigerant: 68% lower Global Warming Potential than older refrigerants (675 vs 2088 GWP)

🌿 Energy Efficiency: Up to 10.8 COP means you use 80-90% less energy than electric heating

🌿 Reduced Carbon Footprint: Lower electricity consumption = fewer CO2 emissions

🌿 Sustainable Operation: Long lifespan with titanium components reduces waste

🌿 Recyclable Design: Unit components can be recycled at end of life

🌿 EU Compliant: Meets all RoHS, WEEE, and F-Gas environmental regulations

By choosing a high-efficiency heat pump over traditional heating, you’re making a responsible choice for future generations while enjoying superior comfort and lower costs.

Annual Maintenance

Required by Law: EU regulation 517/2014 requires annual leak checks by F-Gas certified technicians for equipment containing more than 1kg of refrigerant. The InverTemp-FL contains 1.4kg R32, so annual professional servicing is mandatory for legal compliance and warranty validity.

💎 Summary: The Perfect Pool Heating Solution

The Pentair InverTemp-FL 45-55m³ heat pump represents the ideal balance of performance, efficiency, and comfort for medium-sized residential pools:

🏆 Exceptional Efficiency – Up to 10.8 COP saves you up to 80% on heating costs
🏆 Whisper-Quiet Operation – <42 dB(A) won’t disturb your peace or neighbors
🏆 Smart Technology – WiFi control lets you manage your pool from anywhere
🏆 Year-Round Capability – Works reliably from –15°C to +43°C
🏆 Dual Function – Both heating AND cooling for ultimate comfort
🏆 Premium Quality – Titanium heat exchanger with 10-year warranty
🏆 Eco-Friendly – R32 refrigerant with low environmental impact
🏆 Proven Reliability – Pentair’s engineering excellence and global support

Perfect pool temperatures, effortlessly maintained, with remarkable energy savings and minimal environmental impact – that’s the Pentair InverTemp-FL promise.

Ready to transform your pool experience? Add to cart now and enjoy efficient, quiet, and reliable pool heating for years to come!