🔥 Comfortline Inverter Heat Pump 9kW – Ultra-Efficient DC Pool & Hot Tub Heating

Transform your swimming pool or hot tub into a year-round oasis with the Comfortline Inverter Heat Pump. Powered by advanced DC inverter technology, this 9kW unit delivers exceptional heating performance while consuming up to 66% less energy than traditional electric heaters. With whisper-quiet operation, eco-friendly R32 refrigerant, and intelligent capacity modulation from 20% to 100%, the Comfortline adapts to your heating needs for maximum efficiency and comfort.

✅ UK & Europe Model – Suitable for 230V single-phase power supply (additional freight costs apply for European delivery)

Real Owner Experience

This isn’t just marketing – the site owner personally chose this heat pump for their own DIY hot tub after comparing all available models. The results speak for themselves:

• 💰 66% reduction in running costs compared to a 3kW electric heater
• ⚡ 8x faster heat-up times than traditional heating
• 🔧 Simple, reliable operation – just set and forget
• 🏆 Best value for money in its class

Perfect For:

• 🏊 Swimming pools: 20-35m³ (4,400-7,700 gallons)
• 🛁 Hot tubs & spa pools of all sizes
• 🏡 Residential outdoor pools
• 🌞 Year-round pool heating (operates down to 0°C)

🚀 Key Features & Benefits

1. 🌡️ Intelligent DC Inverter Technology

Unlike traditional on/off heat pumps that run at full capacity all the time, the Comfortline’s DC inverter compressor adjusts heating output from 20% to 100% based on demand:

• Fast Heat-Up Mode: Runs at 100% capacity when you need rapid temperature increase
• Eco Maintenance Mode: Reduces to low-speed operation (as low as 20%) to maintain temperature efficiently
• Result: Higher average COP (Coefficient of Performance) and significantly lower electricity consumption

2. 💚 Exceptional Energy Efficiency

The numbers that matter:

• Average COP of 9.6 at 50% capacity (Air 26°C / Water 26°C / Humidity 80%)
• COP of 6.1 at 15°C air temperature – excellent real-world performance
• For every 1kW of electricity, you get up to 9kW of heat output
• Compare this to standard on/off heat pumps with COP around 5.0

What this means for your wallet: In a typical 180-day pool season, the Comfortline uses approximately 43% less electricity than a traditional heat pump of the same capacity.

3. 🔇 Ultra-Quiet Operation

Enjoy peaceful outdoor relaxation:

• Smart Mode: 40.6-52.5 dB(A) at 1 meter
• Silence Mode: 45.8 dB(A) at 50% capacity – 7dB(A) quieter than Smart mode
• At 10 meters: Only 20.6-32.5 dB(A) – quieter than a whisper

The DC inverter compressor and stepped variable fan deliver 7 times quieter performance than conventional models, perfect for residential neighborhoods and nighttime operation.

4. 🌍 Eco-Friendly R32 Refrigerant

The Comfortline uses R32 refrigerant, which has:

• 675 Global Warming Potential (vs. 2,088 for R-410A)
• 63% lower environmental impact than older refrigerants
• Better heat transfer properties for improved efficiency
• Future-proof compliance with environmental regulations

5. 🏗️ Premium Build Quality

Built to last in outdoor conditions:

• Spiral Titanium Heat Exchanger: 30% larger surface area than standard tube-in-shell designs for superior heat transfer
• Salt Water Safe: Handles up to 3.5% salinity (35g per 1000g water)
• Metal Casing with Plastic Coating: Durable steel body with corrosion-resistant finish
• HP Booster Technology: Enhances COP by 20% over standard heat pumps

6. ❄️ All-Season Performance with Auto-Defrost

Don’t let the seasons stop you:

• Operating Range: 0°C to 43°C ambient air temperature
• Automatic Defrosting: Intelligent temp-controlled defrost cycle prevents ice buildup
• Manual Defrost Option: User-activated when needed
• Optimal Performance Zone: 15-25°C air temperature

7. 🎛️ Simple, Intuitive Controls

No complicated programming – just results:

• Clear LED display shows pool/water temperature
• Easy-to-use up/down temperature setting (18-40°C range)
• One-touch Smart/Silence mode switching
• Compressor operation indicator
• Temperature display in °C or °F

8. 🛡️ Comprehensive Protection Systems

Built-in safeguards protect your investment:

• High and low pressure protection
• Exceeding low temperature auto-stop
• Inlet/outlet temperature differential monitoring
• Compressor start failure detection
• Overheat protection (compressor and inverter board)
• 3-minute start delay prevents short cycling

⚙️ Complete Technical Specifications

Heating Performance

Electrical Specifications

⚠️ Important: Must be hard-wired (no plug allowed). Professional installation required. Unit must be properly earthed.

Physical Specifications

Noise Levels

For context: 45 dB(A) is quieter than a refrigerator and comparable to a library or quiet office.

Components & Materials

📏 Pool & Hot Tub Sizing Guide

Recommended Pool Volumes

Hot Tub Applications

Perfect for ALL hot tub sizes:

• Small Hot Tubs: 1-1.5 m³ (220-330 gallons) – Extremely efficient
• Medium Hot Tubs: 1.5-2.5 m³ (330-550 gallons) – Ideal match
• Large Swim Spas: 3-5 m³ (660-1,100 gallons) – Excellent performance
• Extra-Large Installations: 5+ m³ (1,100+ gallons) – Fast heating

⏱️ Heat-Up Time Estimates

Understanding Heat-Up Performance

The actual time to heat your pool or hot tub depends on several factors:

• Starting water temperature
• Target temperature
• Ambient air temperature
• Wind conditions
• Pool cover usage (reduces heat-up time by 30-50%)
• Insulation quality

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

Hot Tub Heat-Up Times

Based on 6.3kW output at 15°C air temperature (typical UK spring/autumn conditions):

✅ With a Pool Cover: Reduce these times by approximately 30-40%

Swimming Pool Heat-Up Times

Based on 6.3kW output at 15°C air temperature:

⚠️ Important Notes:

• These are estimates for planning purposes
• Warmer air temperatures (25-26°C) can reduce heat-up time by 30-40%
• Always use a pool cover when heating
• Initial heat-up takes longest; maintenance heating is much faster
• For faster initial heating, consider professional start-up services

Maintenance Heating (Daily Top-Up)

Once at temperature, the Comfortline excels at efficient maintenance:

• Hot Tubs: Typically 2-4 hours/day on low power (20-50% capacity)
• Covered Pools: 4-8 hours/day depending on weather
• Average Running Costs: See section below

💰 Running Cost Comparison

Hot Tub Running Costs (Based on 2,000L / 2m³ hot tub)

Scenario: Maintaining 38°C temperature, average UK weather, good cover

💡 Annual Savings with Comfortline:

• vs. Electric Heater: £2,160-£2,700 saved per year
• vs. Standard Heat Pump: £432-£540 saved per year

*Based on £0.30 per kWh (UK average as of 2025)

Swimming Pool Seasonal Costs (Based on 25m³ pool, May-September)

💰 Payback Period: Typically 2-3 years compared to standard heating methods

📄 Downloads & Documentation

Get all the technical details, installation guides, and specifications:

📥 Download Product Manual (PDF) (opens in new tab) Complete 21-page manual with installation instructions, wiring diagrams, technical parameters, troubleshooting guides, and warranty information. Essential reading for installers and DIY enthusiasts.

📥 Download Product Brochure (PDF) (opens in new tab) 3-page technical brochure featuring performance comparisons, efficiency charts, COP data across different operating conditions, and sound level analysis.

🔧 Installation Requirements

Location & Clearances

✅ Minimum Space Requirements:

• Front (Air Intake): 500mm clear space
• Rear (Air Outlet): 500mm clear space
• Sides: 300mm clear space
• Above Unit: 1,000mm clear space
• Total Footprint Needed: Approximately 1.8m × 1.2m

Ideal Installation Location:

• Well-ventilated outdoor area
• Away from bedroom windows (for quiet operation)
• Protected from extreme wind exposure
• Level, solid base (concrete pad or anti-vibration feet)
• Easy access to power supply and pool/hot tub plumbing

Foundation Requirements:

The heat pump must be secured to:

• Concrete Base: 100mm thick minimum, bolted with M10 bolts
• OR Mounting Brackets: Heavy-duty, rust-treated brackets capable of supporting 50+ kg

⚠️ Critical: Unit must NOT be installed indoors or in enclosed spaces

Plumbing Connections

• Connection Size: 50mm (1.5″ female plain socket)
• Required Water Flow: 3-4 m³/hour
• Pipe Distance: Maximum 10m between heat pump and pool/tub (shorter is better)
• Bypass Valve: Strongly recommended for optimal flow control
• Pipe Insulation: Required for maximum efficiency
• Check Valve: Essential to prevent backflow

Electrical Requirements

• Power Supply: 230V / 50Hz single-phase
• Cable: 3 × 1.5mm² (for runs up to 10m; increase size for longer runs)
• Protection: 9.5A breaker and 30mA RCD (residual current device)
• Earthing: Mandatory proper earth connection
• Installation: Must be hard-wired (no plug)

🔌 Professional Installation Required: Due to electrical and plumbing complexity, professional installation is strongly recommended and may be required for warranty validity.

Drainage

• The unit produces condensation water during operation
• Drainage hose (supplied) must be connected to bottom drainage port
• Ensure drainage away from unit and not onto walkways (can freeze in winter)

🌡️ Operating Modes Explained

Smart Mode (Default)

Capacity Range: 20% to 100%

When to Use:

• Initial heat-up of cold water
• Rapid temperature recovery after heavy use
• Cooler weather conditions
• Maximum heating speed required

Characteristics:

• Compressor and fan adjust from 20-100% based on demand
• Fastest heating performance
• Slightly higher noise levels (still quiet)
• Optimizes between speed and efficiency

Silence Mode

Capacity Range: 20% to 80% (capped at 80% max)

When to Use:

• Nighttime operation
• Noise-sensitive environments
• Residential areas with close neighbors
• When maintaining temperature (not rapid heating)

Characteristics:

• 3 dB(A) quieter than Smart Mode at equivalent capacity
• Maximum 80% capacity limit reduces fan and compressor speed
• Still provides excellent heating in most conditions
• Ideal for 24/7 operation in hot tubs

💡 Pro Tip: Start in Smart Mode for initial heat-up, then switch to Silence Mode for overnight maintenance.

🛡️ Warranty Coverage

Manufacturer’s Warranty (Parts Only After First 12 Months)

📋 Warranty Conditions:

• Installation must be carried out by qualified professionals
• Unit must be operated within specified parameters
• Regular maintenance as per manufacturer guidelines
• Warranty covers parts only; labor costs not included after first year
• Full terms available in product manual

💡 Extended Warranty: Contact supplier for optional extended warranty coverage

❓ Frequently Asked Questions

1. Can this heat pump heat my hot tub in winter?

Yes! The Comfortline operates down to 0°C ambient air temperature with auto-defrost functionality. However, efficiency decreases as temperature drops. At 0°C, expect approximately 40-50% of the rated capacity. For sub-zero conditions, consider using the heat pump with a supplementary electric heater, or upgrade to a model rated for lower temperatures. Many owners successfully use this model year-round in UK conditions.

2. How much does it cost to run compared to an electric heater?

The savings are substantial. For a typical 2,000L hot tub running 24/7, expect:

• Electric heater: £2,500-£3,200 per year
• Comfortline heat pump: £430-£540 per year
• Annual savings: £2,000-£2,700

The heat pump typically pays for itself in 2-3 years through energy savings alone.

3. How loud is it really? Can I run it at night?

At 45.8 dB(A) in standard operation (50% capacity), the Comfortline is quieter than a refrigerator. At 10 meters distance, it’s barely audible at 32.5 dB(A). In Silence Mode, it’s even quieter. Most owners report being able to have normal conversations next to the unit, and neighbors rarely notice it’s running.

4. Do I need a bypass valve?

While not strictly required, a bypass valve is highly recommended for:

• Optimal water flow control (3-4 m³/hour)
• Protection against low-flow conditions
• Ability to isolate the heat pump for maintenance
• Prevention of E6 error codes (flow protection)

An Air Source Connection Kit (available separately) includes all necessary valves and plumbing.

5. What size pool or hot tub is this suitable for?

Optimal Performance:

• Hot tubs: Up to 5 m³ (1,100 gallons) – excellent
• Swimming pools: 20-35 m³ (4,400-7,700 gallons) – manufacturer recommended

Marginal Performance:

• Pools 35-40 m³ (7,700-8,800 gallons) – will work but slower heating

Undersized:

• Pools over 40 m³ (8,800+ gallons) – consider the 13kW or larger model

6. Can I install this myself?

While enthusiastic DIYers with electrical and plumbing experience can install this unit, professional installation is recommended for several reasons:

• Electrical work must comply with local regulations
• Proper water flow setup is critical for efficiency and longevity
• Warranty may require professional installation
• Incorrect installation can damage the unit or reduce efficiency

If you do install yourself, follow the manual meticulously and have electrical work certified.

7. What maintenance does it require?

Maintenance is minimal:

Monthly:

• Visual inspection for debris around air intake/outlet
• Check for any unusual noises

Quarterly:

• Clean air filters (if accessible)
• Check condensation drainage

Annually:

• Professional service recommended
• Clean evaporator coils if needed
• Check refrigerant levels
• Inspect electrical connections

Winter Shutdown (if not using):

• Drain all water from heat exchanger
• Disconnect power
• Cover unit to protect from weather

8. Why R32 refrigerant? Is it better?

R32 is a next-generation refrigerant with several advantages:

• 67% lower Global Warming Potential than R-410A (675 vs. 2,088)
• Better heat transfer properties = higher efficiency
• Single-component refrigerant (easier to recycle)
• Future-proof for environmental regulations
• Becoming the new industry standard

9. What’s the difference between this and a standard heat pump?

The DC inverter technology makes a huge difference:

Standard Heat Pump:

• On/off operation (either 100% or 0%)
• COP around 5.0
• Higher running costs
• Larger temperature swings
• Noisier operation

Comfortline Inverter:

• Variable capacity (20-100%)
• COP up to 9.6 at 50% capacity
• 43% lower energy consumption
• Precise temperature control
• 7 dB(A) quieter

10. Can it be used with salt water pools?

Yes! The titanium heat exchanger is salt water safe up to 3.5% salinity (35g per 1,000g water), which covers most residential salt chlorinator systems. The titanium construction provides excellent corrosion resistance. However, always rinse the heat exchanger if shutting down for extended periods.

11. What happens if there’s a power cut?

The heat pump has built-in memory:

• After power restoration, it automatically resumes operation
• Previous temperature settings are retained
• 3-minute delay before compressor restart (protects the unit)

Safety Note: During storms or extended power cuts, it’s advisable to switch off the circuit breaker to protect against power surges when electricity returns.

12. How long does it take to pay for itself?

Payback period varies by usage:

Hot Tub (Year-Round Use):

• vs. Electric heater: 12-18 months
• vs. Standard heat pump: 3-4 years

Swimming Pool (Seasonal Use):

• vs. Electric heating: 2-3 years
• vs. Standard heat pump: 4-5 years

After payback, all savings go straight into your pocket!

✅ What’s Included

In The Box:

• Comfortline Inverter 9kW Heat Pump unit
• Drainage hose and fittings
• Installation manual (21 pages)
• Product brochure
• Warranty registration card

Not Included (Available Separately):

• Water connection pipes and fittings
• Bypass valve kit (recommended)
• Electrical cable and consumer unit components
• Mounting bolts for concrete base
• Pool or hot tub cover

💡 Recommendation: Consider purchasing an Air Source Connection Kit which includes bypass valve, pipes, elbows, and all necessary fittings for a complete installation.

🎯 Perfect For These Applications

✅ Ideal Uses:

• Residential swimming pools 20-35 m³
• Hot tubs and spa pools (all sizes)
• DIY hot tub projects
• Plunge pools
• Exercise pools and endless pools
• Pool houses and garden rooms with hot tubs
• Glamping site spa facilities
• Small commercial spas (single tubs)

❌ Not Recommended For:

• Large commercial pool facilities
• Olympic-size or competition pools
• Indoor pool installations without proper ventilation
• Locations with average winter temperatures below -5°C
• Pools larger than 40 m³ (consider larger model)

🔒 Safety Features & Protections

The Comfortline includes comprehensive protection systems:

Electrical Protection:

• High and low pressure switches
• Thermal overload protection
• Short circuit protection
• Current sensor monitoring
• Phase protection (prevents reverse polarity damage)

Operational Protection:

• Anti-freeze protection (Ed error code)
• Flow protection (E3 – no water flow detection)
• Temperature differential protection (E6 – insufficient flow)
• High discharge temperature protection (E8)
• Compressor start failure detection (F3)

User Safety:

• 30mA RCD requirement prevents electric shock
• Automatic shutdown on fault conditions
• Clear error code display for diagnostics
• Child-safe temperature limits (40°C maximum)

📞 Technical Support & Service

Before You Buy:

• Review the complete manual and brochure (links at top of page)
• Measure your installation space and verify clearances
• Check your electrical supply capacity
• Calculate your pool/tub volume accurately

Installation Support:

• Professional installation recommended
• Refer to installation manual for detailed guidance
• Ensure compliance with local electrical codes
• Register your unit for warranty coverage

Troubleshooting:

• Error codes are displayed on the control panel
• Full error code list available in manual
• Most issues can be resolved by checking flow and power
• Contact supplier for technical support if needed

💡 Pro Tips for Best Performance

Maximize Efficiency:

1. Use a Pool Cover: Reduces heat loss by 70-90% and cuts running costs dramatically
2. Install Pipe Insulation: Prevents heat loss in connecting pipes
3. Optimal Location: Place unit in sunny spot where possible (warmer air = higher COP)
4. Windbreaks: Shield unit from strong winds to maintain air temperature around intake
5. Regular Cleaning: Keep air intake and outlet areas clear of leaves and debris

Optimize Heating Schedule:

1. Initial Heat-Up: Use Smart Mode for fastest results
2. Maintenance: Switch to Silence Mode once at temperature
3. Off-Peak Heating: Heat during warmer afternoon hours when possible (higher COP)
4. Avoid Peak Demand: If on economy tariffs, time heating for cheaper rate periods

Extend Lifespan:

1. Winter draining if not in use prevents freeze damage
2. Annual professional service catches issues early
3. Keep area around unit clean and well-maintained
4. Protect from falling objects (overhanging branches, etc.)

🌍 Environmental Benefits

Choosing the Comfortline Inverter makes a positive environmental impact:

Energy Savings:

• Up to 83% less CO₂ emissions compared to electric heating
• 43% less electricity consumption than standard heat pumps
• Reduces strain on national grid during peak demand

Eco-Friendly Refrigerant:

• R32 has 67% lower Global Warming Potential than previous generation refrigerants
• Single-component gas easier to recycle at end-of-life
• Meets latest F-Gas regulations

Long-Term Sustainability:

• 5-year heat exchanger warranty ensures long service life
• Durable construction minimizes replacement frequency
• Energy efficiency reduces fossil fuel consumption

🏆 Why Buy From Parts4Tubs?

Owner-Tested & Approved: Unlike retailers who just sell products, the owner of Parts4Tubs personally uses this exact heat pump on their own DIY hot tub. This isn’t theory – it’s proven performance in real-world UK conditions.

Expert Knowledge:

• Detailed installation guidance available
• Real-world performance data, not just marketing claims
• Honest advice about sizing and suitability
• Access to compatible accessories and parts

UK-Based Support:

• Fast dispatch within UK
• Technical support from experienced users
• Genuine manufacturer products
• Established supplier reputation

Complete Solutions:

• Air Source Connection Kits available
• Replacement parts in stock
• Installation accessories
• Everything needed for successful setup

📦 Specifications Summary Table

🔧 Installation Checklist

Before scheduling installation, ensure you have:

☐ Site Preparation:

• Concrete base or mounting brackets prepared
• Minimum clearances measured and confirmed
• Power supply route planned
• Drainage route identified

☐ Plumbing:

• Pool/tub volume calculated
• Pipe route planned (max 10m)
• Bypass valve obtained (if using)
• Pipe insulation materials ready
• Check valve included in plan

☐ Electrical:

• Consumer unit capacity checked
• 9.5A breaker available
• 30mA RCD installed
• Cable route planned
• Qualified electrician booked (if needed)

☐ Documentation:

• Manual downloaded and read
• Warranty registration details ready
• Local building codes checked
• Professional installer briefed (if using)

🎓 Understanding COP (Coefficient of Performance)

What is COP? COP measures how efficiently a heat pump converts electrical energy into heat energy.

COP = Heat Output ÷ Electrical Input

Example:

• Input: 1.0 kW of electricity
• Output: 9.6 kW of heat
• COP = 9.6

Why Variable COP Matters: The Comfortline’s COP varies by capacity:

• At 20% capacity: COP = 10.6 (super efficient maintenance mode)
• At 50% capacity: COP = 9.6 (optimal balance)
• At 100% capacity: COP = 6.8 (rapid heating mode)

Traditional heat pumps run at 100% constantly, giving fixed COP around 5.0. The Comfortline adjusts its capacity to maintain the highest possible COP for the heating demand.

💼 Commercial Considerations

While primarily designed for residential use, the Comfortline can work in light commercial applications:

✅ Suitable For:

• Single hot tub spa businesses
• Small B&B or hotel properties
• Glamping sites with individual tubs
• Personal training studios with single pool
• Holiday cottage facilities

⚠️ Considerations:

• Heavy daily use may require more frequent servicing
• Consider warranty implications of commercial use
• May need multiple units for multiple pools/tubs
• Consult supplier about commercial warranty options

🛠️ Maintenance Schedule

User Maintenance (DIY)

Monthly:

• Visual inspection of unit exterior
• Clear any debris from air intake/outlet
• Check condensation drainage is working
• Listen for unusual noises

Quarterly:

• Deep clean around unit
• Check all visible connections
• Test operation in both modes
• Verify temperature accuracy

Professional Service (Annual)

Recommended Annual Service Includes:

• Refrigerant level check
• Electrical connection inspection
• Compressor performance test
• Heat exchanger inspection and cleaning
• Control board diagnostics
• Fan motor check
• Safety system verification
• Full operational test

Cost: Typically £80-£150 per year

📈 Performance at Different Temperatures

Understanding how ambient temperature affects performance:

Key Takeaway: The heat pump works in cold weather but is more efficient in warmer conditions. This is why swimming pool heating costs are lowest in summer!

🔌 Electrical Details for Installers

Connection Requirements:

• Supply: 230V ± 10%, 50Hz ± 1%
• Maximum current draw: 6.09A
• Power factor: >0.95
• Starting current: 1.57A (soft start inverter)

Protection Required:

• MCB: Type B or C, 9.5A rating
• RCD: Type A or AC, 30mA, 40ms trip time
• Earth: Continuous to main earthing terminal
• Isolation: Lockable isolator recommended

Cable Specifications:

• Phase, Neutral, Earth: 3 × 1.5mm² for runs ≤10m
• For runs >10m: Increase to 2.5mm² minimum
• Voltage drop: Must not exceed 4% (9.2V) under full load
• Signal cable (if using remote display): 3 × 0.5mm²

Installation Standards:

• BS 7671 (18th Edition) compliance required
• IP rating of outdoor connections: Minimum IP44
• Cable glands: Weather-resistant compression type
• All external connections in suitable enclosures

🌡️ Temperature Setting Guide

Recommended Settings by Application:

Hot Tubs:

• Summer: 38-40°C (100-104°F)
• Winter: 36-38°C (97-100°F) – lower temp easier to maintain
• Energy Saving: 35°C (95°F) – still comfortable

Swimming Pools:

• Family Use: 26-28°C (79-82°F)
• Exercise/Lap Swimming: 24-26°C (75-79°F)
• Children’s Pools: 28-30°C (82-86°F)
• Hydrotherapy: 30-32°C (86-90°F)

Plunge Pools:

• Warm Plunge: 15-18°C (59-64°F)
• Cool Therapy: 10-15°C (50-59°F)
• Cold Therapy: 5-10°C (41-50°F)

🎁 Accessories & Add-Ons Available

Enhance your installation with these compatible products:

Essential:

• Air Source Connection Kit – Complete plumbing solution with bypass valve
• Pipe Insulation – Reduces heat loss in connecting pipes
• Pool Cover – Dramatically reduces running costs

Recommended:

• Timer Control – Automate operation for off-peak heating
• Water Chemistry Test Kit – Maintain optimal water balance
• Condensate Drain Kit – Proper drainage solution
• Anti-Vibration Mounting Pads – Further noise reduction

Optional:

• Weather Protection Cover – For winter storage
• Remote Temperature Display – Monitor from indoors
• Extended Warranty – Additional peace of mind

🌟 Final Summary: Is This Right For You?

The Comfortline Inverter 9kW is PERFECT if you:

• ✅ Have a hot tub or pool 20-35m³ (up to 7,700 gallons)
• ✅ Want dramatic reductions in heating costs (up to 66% savings)
• ✅ Value quiet operation for residential settings
• ✅ Care about environmental impact (R32, high efficiency)
• ✅ Want proven, owner-tested performance
• ✅ Prefer simple, reliable operation over complicated features
• ✅ Have suitable outdoor installation space

Consider a Different Model if:

• ❌ Your pool is larger than 40m³ (8,800 gallons) – get the 13kW or 17kW
• ❌ You need WiFi control – look at higher-spec models
• ❌ Average winter temps regularly drop below -5°C – need ultra-low temp model
• ❌ You want the absolute fastest heating – consider a larger capacity

Bottom Line: The Comfortline Inverter 9kW offers exceptional value, proven reliability, and real-world savings. It’s the heat pump the owner chose for their own hot tub after comparing all available options – and that speaks volumes.

Ready to transform your pool or hot tub heating?

🛒 Add to Basket Now and start saving on your energy bills while enjoying perfectly heated water year-round!

Still have questions? Contact our team – we’re actual users of this product and can provide honest, experienced advice.

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	2 inch Flapper Check Valve 1.25-2lbs. Spring 2-inch Flapper Check Valve: The Heart of Your Hot Tub’s Circulation As a dedicated hot tub enthusiast and spare parts supplier, I’m excited to introduce you to a crucial component that keeps your spa running smoothly: the 2-inch Flapper Check Valve with a 1.25-2lbs Spring. This small but mighty piece of equipment plays a vital [...]	£12.17 Max: 100 Min: 1 Step: 1 Add to cart
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	Air Source Connection Kit – Regular (2″) with Flapper Valve (for single pump system) The Air Source Connection Kit from Buildahottub.com is everything you need to connect your new air source heat pump to your existing hot tub. The difference in the two sizes is the amount of pipe that is supplied and also the number of elbows and couplers. This kit includes 1 x 1.5″ Bypass Valve setup  [...]	£255.00 Max: Min: 1 Step: 1 Add to cart
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	Air Source Connection Kit – Large (2″) The Air Source Connection Kit from Buildahottub.com is everything you need to connect your new air source heat pump to your existing hot tub. The difference in the three sizes is the amount of Pipe that is supplied and also the number of elbows and couplers. This kit includes 1 x 1.5″ Air Source Bypass [...]	£345.00 Max: Min: 1 Step: 1 Add to cart
	Air Source Connection Kit – Extra Large (1.5″) The Air Source Connection Kit from Buildahottub.com is everything you need to connect your new air source heat pump to your existing hot tub. The difference in the three sizes is the amount of Pipe that is supplied and also the number of elbows and couplers. This kit includes 1 x 1.5″ Air Source Bypass [...]	£385.00 Max: Min: 1 Step: 1 Add to cart
	Air Source Connection Kit – Extra Large (2″) The Air Source Connection Kit from Buildahottub.com is everything you need to connect your new air source heat pump to your existing hot tub. The difference in the three sizes is the amount of Pipe that is supplied and also the number of elbows and couplers. This kit includes 1 x 1.5″ Air Source Bypass [...]	£470.00 Max: Min: 1 Step: 1 Add to cart