Pentair InverTemp-FL Heat Pump 85-105m³ 🌊 Ultra-Quiet Full Inverter Pool Heating & Cooling System

Transform your large pool into a year-round oasis with the Pentair InverTemp-FL Heat Pump – the perfect blend of whisper-quiet operation, exceptional efficiency, and intelligent control. Designed for pools between 85-105m³, this premium heat pump delivers consistent, reliable heating and cooling while using up to 80% less energy than traditional heating systems.

💰 Save Up to 80% on Energy Costs With an impressive COP (Coefficient of Performance) reaching up to 10.1, this heat pump delivers 10 times more heating energy than the electricity it consumes. In Eco Silent mode, every 1kW of electricity produces up to 10.1kW of heat – making it one of the most efficient pool heating solutions available.

🔇 Whisper-Quiet Operation Certified at less than 42 dB(A) in Boost Mode – quieter than a library or normal conversation. The aerodynamic design minimizes air turbulence and vibration, ensuring peaceful surroundings for you and your neighbours. Perfect for residential settings where noise matters.

📱 Smart WiFi Control from Anywhere Manage your pool temperature from your smartphone using the free Smart Life app (iOS & Android). Adjust settings, monitor performance, and schedule heating cycles from the comfort of your home or while you’re away. The integrated WiFi TFT touch screen also provides easy local control.

🌍 Eco-Friendly R32 Refrigerant Uses environmentally responsible R32 refrigerant with a significantly lower global warming potential than older refrigerants. Reduce your carbon footprint while enjoying superior heating efficiency and long-term reliability.

❄️ All-Season Performance Operates effectively in extreme weather conditions from –15°C to +43°C. Automatic active defrosting ensures consistent performance even during cold UK winters, so you can extend your swimming season beyond summer.

🌟 Key Features & Benefits

Full Inverter Technology The heart of this heat pump’s exceptional performance. Unlike traditional on/off heat pumps, Full Inverter Technology automatically modulates compressor and fan speeds in real-time to maintain your desired water temperature with maximum efficiency. This smooth, gradual power adjustment reduces energy consumption, minimizes wear on components, and extends the lifespan of your investment.

Three Intelligent Operating Modes Choose the perfect balance between performance, efficiency, and noise level:

• 🌿 Eco Silent Mode: The most economical and quietest operation (30-60% power). Perfect for overnight heating and residential areas. COP ranges from 8.1 to 10.1 – delivering exceptional efficiency while maintaining near-silent operation.
• ⚡ Smart Mode: Intelligent adaptive heating (30-100% power) that automatically adjusts to environmental conditions. The system monitors both air temperature and water temperature, dynamically balancing power output and sound level for optimal performance throughout the day.
• 🚀 Boost Mode: Maximum heating power (85-100% capacity) for rapid temperature increase. Ideal when you need to heat your pool quickly or during colder periods. Delivers 20.1kW of heating capacity.

Premium Titanium Heat Exchanger Engineered for longevity and corrosion resistance, the titanium heat exchanger withstands harsh pool chemicals and varying water conditions. This premium component ensures reliable heat transfer and comes with an exceptional 10-year warranty – a testament to Pentair’s confidence in its durability.

Compatible with Pool Automation Systems Seamlessly integrates with Pentair automation systems including Speedeo®, Soleo® VS, and Intellipool® via RS485 Modbus connection. Create a fully automated pool management system that handles filtration, heating, cleaning, and chemical dosing from a single interface.

Advanced Heating Priority Function The heat pump can automatically activate your filtration pump when the water temperature drops below your desired setting, ensuring your pool maintains the perfect temperature without manual intervention. This intelligent feature prioritizes heating efficiency and guarantees comfortable swimming conditions.

Robust Construction for UK Weather Built to withstand the British climate with a reinforced ABS cabinet featuring UV protection and integrated soundproof panels. The painted sheet metal construction ensures long-lasting durability, while the aerodynamic design reduces wind resistance and noise transmission.

Single Phase Power Supply Designed for standard UK residential electrical systems (230V single phase), eliminating the need for expensive three-phase power upgrades. Simple integration into existing home electrical installations.

📄 Downloads & Documentation

Get complete technical specifications, installation guidance, and operating instructions:

📥 Pentair InverTemp FL Heat Pump Manual (opens in new tab) Complete installation and operating manual including safety instructions, technical specifications, hydraulic and electrical connection diagrams, maintenance procedures, WiFi setup guide, troubleshooting codes, and circuit diagrams. Essential reading for installers and owners. (PDF, comprehensive guide)

📊 Complete Technical Specifications

General Specifications

Specification	Detail
Recommended Pool Volume	85–105 m³
Compressor Type	Mitsubishi/Toshiba 2D Full DC Inverter
Refrigerant	R32 (Eco-friendly, low GWP)
Heat Exchanger	Titanium (corrosion resistant)
Operating Temperature Range	–15°C to +43°C air temperature
Maximum Water Temperature	45°C
Power Supply	230V ~ 50Hz Single Phase
Maximum Power Consumption	5.4 kW
IP Rating	IPX4 (protected against water splashing)
Maximum Operating Altitude	2,000 metres

Performance Data – 28°C Air / 28°C Water (Ideal Conditions)

Mode	Heating Capacity	COP	Power Range
Boost Mode	20.1 kW	5.2 – 5.9	85-100%
Smart Mode	6.5 – 20.1 kW	5.2 – 10.1	30-100%
Eco Mode	6.5 – 12.2 kW	8.1 – 10.1	30-60%

Performance Data – 15°C Air / 28°C Water (UK Spring/Autumn)

Mode	Heating Capacity	COP	Power Range
Boost Mode	14.6 kW	4.3 – 4.6	85-100%
Smart Mode	4.9 – 14.6 kW	4.3 – 4.6	30-100%
Eco Mode	4.9 – 9.0 kW	4.3 – 4.6	30-60%

Performance Data – 7°C Air / 26°C Water (UK Winter)

Parameter	Value
Heating Capacity	8.3 kW
COP	3.0
Sound Pressure (at 10m)	28.9 dB(A)

Physical Specifications

Dimension	Measurement
Length (A)	922 mm
Height (B)	1,175 mm
Width (C)	508 mm
Base Length (D)	669 mm
Base Width (E)	485 mm
Control Panel Height (F)	92 mm
Internal Clearance (G)	430 mm
Weight	88 kg
Noise Level (Boost Mode)	<42 dB(A) certified
Noise Level (Eco Mode at 10m)	28.9 dB(A)

Hydraulic Specifications

Specification	Detail
Hydraulic Connection	1.5″ / 50mm PVC
Recommended Water Flow	5-7 m³/h (approx. 100 L/min)
Maximum Chlorine Level	2.5 ppm
Recommended pH Range	6.9 – 8.0

Electrical Specifications

Specification	Detail
Voltage	230V Single Phase
Frequency	50 Hz
Maximum Current	16.0 A
Required Circuit Breaker	Type C 20A
Recommended Cable	3G 4mm² (up to 54m length)
Required RCD Protection	30mA residual current device

Warranty Coverage

Component	Warranty Period
Parts Warranty	3 Years
Titanium Heat Exchanger	10 Years

🏊 Pool Sizing Guide & Compatibility

Recommended Pool Volumes

Optimal Performance: 85-105 m³ This heat pump is specifically engineered for large residential and light commercial pools within this volume range. Using a heat pump matched to your pool size ensures optimal efficiency, appropriate heat-up times, and maximum energy savings.

Common Pool Size Examples

Pool Dimensions (L × W × Depth)	Volume (m³)	Compatibility
10m × 5m × 1.5m	75 m³	✅ Suitable (lower range)
12m × 5m × 1.5m	90 m³	✅ Ideal Match
14m × 5m × 1.5m	105 m³	✅ Ideal Match
10m × 6m × 1.8m	108 m³	✅ Suitable (upper range)
15m × 6m × 1.5m	135 m³	⚠️ Consider larger model

💡 Important: For pools with irregular shapes, calculate the average depth. For example, a pool that slopes from 1m to 2m deep has an average depth of 1.5m.

⏱ Estimated Heat-Up Times

These estimates show approximately how long it takes to heat your pool under typical UK spring/autumn conditions using Smart Mode at 15°C air temperature (14.6kW average output). Actual times vary based on air temperature, starting water temperature, wind exposure, and whether your pool is covered.

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

Heat-Up Time Table (15°C Air Temperature – UK Spring/Autumn)

Pool Volume	15°C → 20°C (5°C rise)	15°C → 24°C (9°C rise)	15°C → 28°C (13°C rise)	20°C → 28°C (8°C rise)
75 m³	30 hours	53 hours	77 hours	46 hours
85 m³	34 hours	61 hours	87 hours	52 hours
90 m³	36 hours	64 hours	92 hours	55 hours
105 m³	42 hours	75 hours	107 hours	64 hours

Heat-Up Time Table (28°C Air Temperature – UK Summer)

Using Boost Mode at 28°C air temperature (20.1kW output):

Pool Volume	20°C → 24°C (4°C rise)	20°C → 26°C (6°C rise)	22°C → 28°C (6°C rise)	24°C → 28°C (4°C rise)
75 m³	17 hours	26 hours	26 hours	17 hours
85 m³	19 hours	29 hours	29 hours	19 hours
90 m³	21 hours	31 hours	31 hours	21 hours
105 m³	24 hours	36 hours	36 hours	24 hours

⚠️ Important Disclaimers:

• These are theoretical estimates based on ideal conditions
• Actual heat-up times will vary based on: air temperature, humidity, wind exposure, pool insulation, and whether the pool is covered
• Using a pool cover reduces heat-up time by up to 50-70% and dramatically reduces running costs
• Cold, windy, or humid conditions will increase heating times
• Initial heat-up from cold takes longer; maintaining temperature requires much less energy
• Times shown assume continuous operation – spreading heating over several days is more typical and efficient

💰 Running Cost Comparison vs Alternative Heating Methods

Based on a 90m³ pool heated from 15°C to 24°C (9°C temperature rise) with typical UK electricity and gas rates:

Initial Heat-Up Cost Comparison

Heating Method	Energy Used	Approximate Cost	Time Required
Pentair InverTemp-FL (COP 5.0 avg)	2,318 kWh electrical	£695	64 hours
Standard Heat Pump (COP 3.5)	3,311 kWh electrical	£993	92 hours
Electric Heater (100% efficiency)	11,592 kWh electrical	£3,478	38 hours
Gas Boiler (80% efficiency)	14,490 kWh gas	£1,014	24 hours
Oil Boiler (85% efficiency)	13,638 kWh oil	£1,227	27 hours

Electricity rate: £0.30/kWh | Gas rate: £0.07/kWh | Oil rate: £0.09/kWh

Season-Long Running Costs (May-September, Maintaining 26°C)

Heating Method	Estimated Total Cost
Pentair InverTemp-FL	£450 – £750
Standard Heat Pump	£640 – £1,070
Electric Heater	£2,250 – £3,750
Gas Boiler	£790 – £1,320

💡 Savings Insight: The Pentair InverTemp-FL can save you £800-£3,000+ per season compared to electric heating, and £200-£600 compared to gas heating. Over the 10-year lifespan, total savings can exceed £15,000!

🌡️ Seasonal Performance Expectations

UK Spring (March – May)

Air Temperature Range: 8-15°C

• Heating Capacity: 8.3 – 14.6 kW
• COP: 3.0 – 4.6
• Best Mode: Smart or Boost for initial season heat-up
• Expected Performance: Excellent for bringing pool to temperature. May take 7-10 days for initial heat-up from cold. Recommend using pool cover overnight.

UK Summer (June – August)

Air Temperature Range: 15-28°C

• Heating Capacity: 14.6 – 20.1 kW
• COP: 4.3 – 10.1
• Best Mode: Eco Silent for temperature maintenance
• Expected Performance: Peak efficiency. Heat pump excels in these conditions. Can typically maintain temperature running just 4-6 hours per day with a cover.

UK Autumn (September – October)

Air Temperature Range: 10-18°C

• Heating Capacity: 9.0 – 16.0 kW
• COP: 3.2 – 5.5
• Best Mode: Smart for adaptive performance
• Expected Performance: Good performance for extending swimming season. Pool cover essential to minimize heat loss. Expect running time of 8-12 hours per day.

UK Winter (November – February)

Operating Capability: Down to -15°C

• Heating Capacity: 6.0 – 11.0 kW
• COP: 2.5 – 4.0
• Best Mode: Boost (if heating), otherwise winterize
• Expected Performance: Heat pump remains operational but efficiency reduces. Most pool owners winterize during this period. Ideal for covered/indoor pools or frost protection.

🔧 Installation Requirements & Clearance Guidelines

Space Requirements Around Heat Pump

Critical for Safety and Performance:

• Front (Fan Outlet): 3 metres minimum clear space – this is where cool air exhausts
• Rear & Sides (Air Intake Grids): 1 metre minimum clear space (30cm absolute minimum)
• Maintenance Access: Additional 500mm clearance recommended for servicing
• No Overhead Obstructions: Avoid installing under trees, roof eaves, or overhangs

Why This Matters: Insufficient clearance reduces efficiency, increases noise, causes overheating, and may void warranty. The heat pump needs unrestricted airflow to operate effectively.

Installation Surface Requirements

✅ Ideal Installation Base:

• Concrete slab minimum dimensions: 1,400mm × 750mm
• Perfectly level surface (use spirit level during installation)
• Load-bearing capacity: minimum 150 kg
• Solid, non-vibrating foundation

✅ Mounting:

• Install on provided vibration-dampening skids (included)
• Secure with 8mm galvanized lag screws with washers
• Anti-vibration pads help minimize noise transmission

❌ Never Install:

• On wooden decking or non-rigid surfaces (transmits vibration noise)
• Under sprinkler systems or areas exposed to spray/flooding
• Near sources of heat, flammable gas, or corrosive chemicals
• In areas where snow accumulation is likely
• Close to open windows or neighboring properties (noise consideration)
• On soft ground, grass, or unstable surfaces

Hydraulic Connection Requirements

From Pool Filtration System → Heat Pump:

• Install AFTER the filter (clean water protects heat exchanger)
• Install BEFORE treatment systems (chlorinators, pH dosers, UV systems)
• Use 50mm (1.5″) PVC pipe throughout
• Bypass valve system MUST be installed for servicing
• Recommended: Insulate pipes to reduce heat loss (especially runs over 5 metres)

Water Quality Standards (NF-EN-16713-3):

• Chlorine: Maximum 2.5 ppm
• pH: 6.9 – 8.0 range
• Water flow: 5-7 m³/h (approximately 100 L/min)
• Temperature: 15°C minimum for start-up

Electrical Installation Requirements

⚡ Critical Safety Information:

• Installation MUST be performed by qualified electrician
• 30mA RCD (Residual Current Device) protection is mandatory
• Circuit breaker: Type C 20A minimum
• Cable: 3G 4mm² for runs up to 54 metres
• All wiring must comply with BS 7671 (UK Wiring Regulations)
• Heat pump must be connected to proper earth ground
• Minimum 2 metres distance from pool water edge (per safety regulations)

Power Supply:

• 230V single phase, 50Hz
• Maximum current draw: 16.0A
• Maximum power consumption: 5.4kW
• No extension cables permitted – direct connection to dedicated circuit only

❓ Frequently Asked Questions

How long does it take to heat my pool?

Heat-up time depends on pool volume, starting temperature, target temperature, air temperature, and whether you use a pool cover. For a typical 90m³ pool:

• Summer conditions (28°C air): 20-30 hours from 20°C to 26°C
• Spring/autumn (15°C air): 55-70 hours from 15°C to 26°C

Using a pool cover can reduce heat-up time by 50% and dramatically cut running costs. The heat pump works most efficiently when heating gradually over 3-5 days rather than rapidly.

What’s the difference between Eco, Smart, and Boost modes?

• Eco Silent Mode: Quietest operation (28.9 dB(A) at 10m), uses 30-60% power, delivers COP up to 10.1. Perfect for overnight heating and noise-sensitive areas. Most economical but slower heating.
• Smart Mode: Intelligent adaptive mode that automatically adjusts power (30-100%) based on conditions. Balances efficiency with performance. Best all-around choice for daytime operation.
• Boost Mode: Maximum power (85-100% capacity), delivering 20.1kW heating. Use when you need rapid temperature increase or during colder weather. Less efficient but faster results.

How much does it cost to run per day/month?

Running costs vary significantly based on weather, pool size, cover usage, and desired temperature:

• Summer (maintaining 26°C with cover): £2-5 per day | £60-150 per month
• Spring/Autumn (maintaining 24°C with cover): £4-8 per day | £120-240 per month
• Without pool cover: Add 70-150% to above costs

Using the timer function to heat during off-peak electricity hours can reduce costs by 20-40% if you have a time-of-use tariff.

Will this heat pump work in winter?

Yes, the InverTemp-FL operates down to -15°C air temperature, but efficiency decreases in cold weather. At 7°C air temperature, it delivers 8.3kW with a COP of 3.0 – still viable but not as efficient as summer operation. Most UK pool owners winterize outdoor pools from November-March, though the heat pump can provide frost protection if needed. It’s excellent for extending the season into October and starting earlier in April.

How loud is this heat pump? Will it disturb my neighbours?

At less than 42 dB(A) certified in Boost mode, this is one of the quietest heat pumps available:

• Eco Mode at 10 metres: 28.9 dB(A) – quieter than a whisper
• Boost Mode: <42 dB(A) – similar to a quiet library or refrigerator hum
• For comparison: Normal conversation is 60 dB(A), bird songs are 44 dB(A)

To minimize any potential noise impact:

• Don’t point the fan outlet toward windows or neighbouring gardens
• Don’t install under windows
• Install sound barriers if needed (maintain minimum clearances)
• Use Eco Silent mode during evening/night hours
• Add 50cm of PVC pipe at inlet/outlet to dampen vibration noise

Do I need to cover my pool?

While not mandatory, a pool cover is highly recommended and transforms heat pump efficiency:

• Reduces heat loss by 70-80% overnight and when pool is unused
• Cuts running costs by 50-70%
• Reduces heat-up time by half
• Extends swimming season significantly
• Reduces water evaporation and chemical usage

An uncovered pool can lose 4-6°C overnight on cool evenings. A pool cover is the single most cost-effective accessory for any heated pool.

Can I control the heat pump remotely?

Yes! The InverTemp-FL features built-in WiFi and works with the free Smart Life app (iOS and Android):

• Adjust temperature from anywhere
• Monitor current water temperature
• Switch between Eco/Smart/Boost modes
• Set up heating schedules and timers
• Receive alerts and notifications
• View energy consumption data

The heat pump also features a local WiFi TFT touch screen for easy on-site control, and is compatible with Pentair automation systems (Speedeo®, Soleo® VS, IntelliPool®) via RS485 Modbus connection.

What maintenance does the heat pump require?

Minimal routine maintenance keeps your heat pump running optimally:

Monthly (Pool Owner):

• Visual inspection – check for leaves, debris around air intakes
• Verify pressure gauge reading matches ambient temperature
• Clean evaporator fins with soft brush or gentle water spray (never pressure wash)

Annually (Qualified Technician):

• Professional inspection and cleaning
• Check refrigerant pressure and charge
• Inspect electrical connections
• Test safety systems and sensors
• Verify water flow and pressure settings
• Check for refrigerant leaks (required by law for R32 systems)

Winterization: If closing pool for winter, follow proper winterization procedure: drain heat pump completely, disconnect power, cover with provided winter blanket.

How is this different from a standard on/off heat pump?

Full Inverter Technology is the key difference:

Traditional On/Off Heat Pumps:

• Run at fixed speed (100% or 0%)
• Constantly cycling on and off
• Less efficient (COP typically 3.5-4.5)
• Noisier operation
• Higher electricity bills
• More wear on components

Pentair InverTemp-FL Full Inverter:

• Variable speed from 30-100%
• Continuously modulates to match demand
• Exceptional efficiency (COP up to 10.1)
• Ultra-quiet operation
• Up to 80% energy savings
• Extended component lifespan
• More stable water temperature

The inverter technology is like the difference between cruise control and constantly pressing/releasing the accelerator in a car – smoother, more efficient, and better for the system.

Is the R32 refrigerant safe and environmentally friendly?

Yes, R32 is a modern, eco-friendly refrigerant:

• Lower global warming potential (GWP 675) vs older refrigerants (R410A GWP 2088)
• More energy efficient than previous generation refrigerants
• Non-ozone depleting
• Classified as A2L (low flammability under normal use)
• Fully compliant with UK and EU F-Gas regulations

R32 is the environmental choice for new heat pumps and demonstrates Pentair’s commitment to sustainable pool heating solutions.

What warranty coverage is included?

Comprehensive Warranty Protection:

• 3 Years Parts Warranty – full coverage on all components
• 10 Years on Titanium Heat Exchanger – exceptional coverage on the heart of the system
• Warranty requires annual maintenance by qualified technician
• Registration required within 30 days of installation

This industry-leading warranty demonstrates Pentair’s confidence in the InverTemp-FL’s reliability and durability. The 10-year heat exchanger warranty is particularly impressive and rare in the industry.

Can I install this heat pump myself?

Professional installation is mandatory and required to:

• Maintain warranty validity
• Ensure safety (electrical and refrigerant hazards)
• Comply with UK regulations (Building Regs, electrical standards)
• Achieve optimal performance and efficiency
• Meet insurance requirements

Installation requires qualified professionals:

• Electrical work: Certified electrician (BS 7671 compliance)
• Hydraulic connections: Pool professional or plumber
• Refrigerant system: Only if repairs needed (F-Gas certified)

DIY installation will void warranty and may create safety hazards. Budget £400-800 for professional installation depending on complexity and location.

How long will this heat pump last?

With proper maintenance, expect:

• 15-20 years typical lifespan
• Titanium heat exchanger: 20-25+ years (covered by 10-year warranty)
• Compressor: 12-15 years average
• Fan and electronics: 10-15 years

The Full Inverter technology actually extends lifespan by reducing thermal stress on components through smoother operation compared to on/off heat pumps. Regular annual servicing is key to maximizing longevity.

✅ Why Buy from Parts4Tubs?

Authorized Pentair Dealer We’re an official Pentair distributor, ensuring genuine products, full manufacturer warranty, and expert technical support.

Expert Advice Available Our team of pool heating specialists can help you:

• Confirm this model is right for your pool size
• Provide installation recommendations
• Suggest compatible accessories and automation
• Answer technical questions before and after purchase

Fast UK Delivery We maintain stock of all major Pentair models and ship quickly throughout the UK. Your pool season shouldn’t wait!

After-Sales Support We’re here for the long term:

• Technical support helpline
• Help with warranty claims
• Replacement parts availability
• Maintenance guidance

🎯 Perfect For

✅ Large residential pools (85-105m³) ✅ Light commercial facilities and swim schools ✅ Noise-sensitive residential areas ✅ Eco-conscious pool owners seeking energy efficiency ✅ Pools requiring year-round temperature control ✅ Properties with single-phase electrical supply ✅ Owners wanting smartphone control and automation ✅ Extended swimming season (April-October) ✅ Covered or indoor pools requiring consistent heating

⚠️ Important Considerations Before Purchase

Confirm Pool Volume: Measure your pool accurately. This model suits 85-105m³. Undersized heat pumps struggle to maintain temperature; oversized units cycle inefficiently.

Electrical Requirements: Ensure you have 230V single-phase supply with capacity for 16A dedicated circuit. Professional electrical assessment recommended.

Installation Space: Verify you have adequate clearance (3m front, 1m sides/rear) and solid, level base for installation.

Pool Cover Highly Recommended: Without a cover, running costs increase by 70-150% and heat-up times double. Factor this into your budget.

Professional Installation Required: Budget £400-800 for qualified installation. This is mandatory for warranty and safety.

Climate Consideration: Most efficient in temperatures above 10°C. Can operate to -15°C but efficiency decreases in very cold weather.

📞 Need Help Choosing?

Not sure if this is the right model for your pool? Our heat pump specialists are here to help!

Contact us for:

• Pool volume calculations and sizing advice
• Site assessment guidance
• Installation cost estimates
• Compatible accessories recommendations
• Technical specifications clarification

Transform your pool into a year-round luxury with the Pentair InverTemp-FL – where cutting-edge technology meets whisper-quiet operation and exceptional efficiency. Order today and start enjoying perfectly heated pool water tomorrow!