Comfortline Inverter Heat Pump 24 kW
£2,645.00 Inc VAT
Comfortline Inverter Heat Pump 24kW – Ultra-Efficient Pool & Hot Tub Heating 🌊
Transform your swimming pool or hot tub experience with the Comfortline Inverter Heat Pump 24kW – the most economical and whisper-quiet heating solution on the market. Featuring advanced DC inverter technology, this heat pump delivers exceptional efficiency with up to 66% lower running costs compared to traditional electric heaters, while heating your water 8 times faster.
Perfect for pools ranging from 55m³ to 90m³ and hot tubs of all sizes, this premium heat pump adapts intelligently to your heating needs, running at full capacity for rapid warm-up and automatically reducing to energy-saving mode once your target temperature is reached.
Unmatched Efficiency With an impressive COP (Coefficient of Performance) of up to 11.8 at optimal conditions, this heat pump generates up to 9 times more heat energy than it consumes in electricity. That means for every 1kW of electricity used, you receive up to 9kW of heating power – making it one of the most cost-effective heating solutions available.
Whisper-Quiet Operation 🔇 Thanks to the advanced DC inverter compressor and variable-speed fan technology, the Comfortline operates at just 42.8 dB(A) at average capacity – quieter than a normal conversation. With the built-in Silence Mode, noise levels drop even further, making it ideal for residential settings and nighttime operation without disturbing neighbours.
All-Season Performance Designed to operate reliably in ambient temperatures from 0°C to 43°C, this heat pump features intelligent auto-defrost technology that allows continued operation even in near-freezing conditions. Whether you’re extending your swimming season or maintaining your hot tub year-round, the Comfortline delivers consistent performance.
Smart Variable Speed Technology Unlike traditional on/off heat pumps that operate at full power continuously, the Comfortline intelligently adjusts its heating capacity from 20% to 100%. This means faster initial heating when needed, then efficient low-power maintenance once your target temperature is reached – significantly reducing energy consumption and wear on components.
Eco-Friendly R32 Refrigerant 🌱 Using R32 refrigerant with a Global Warming Potential (GWP) of just 675 – compared to 2,088 for R-410A – this heat pump represents a more environmentally responsible choice while delivering superior performance.
Key Features & Benefits
🔧 Premium Build Quality
- Durable metal casing with protective plastic coating for longevity
- Spiral titanium heat exchanger with 30% greater surface area than standard exchangers
- Salt-safe up to 3.5% concentration (35g per 1000g water)
- Corrosion-resistant components throughout
⚡ Advanced Technology
- GMCC DC Inverter Compressor for superior efficiency and reliability
- HP Booster Technology adds 20% efficiency compared to standard heat pumps
- Fully variable compressor speed (20-100% capacity)
- Stepped variable fan speed for optimized airflow
🎯 Intelligent Control System
- Simple, intuitive control panel with clear digital display
- Temperature range: 18°C to 40°C (adjustable in 0.5° increments)
- Smart Mode: 100-20% capacity for maximum efficiency
- Silence Mode: 80-20% capacity for ultra-quiet nighttime operation
- Auto-defrost function for reliable operation down to 0°C
- 3-minute delay start protection for compressor longevity
🛡️ Comprehensive Protection Systems
- High/low pressure protection
- Extreme temperature auto-stop protection
- Water flow protection
- Phase protection (prevents reverse operation)
- Overheat protection for compressor and electronics
- Anti-freeze protection
💡 Installation-Friendly Design
- 1.5″ (50mm) female plain socket connections
- Compact footprint: 954mm × 429mm × 755mm
- Net weight: 68kg
- Suitable for both new installations and retrofits
- Compatible with standard pool filtration systems
Complete Technical Specifications
| Specification | AMIR24 (24kW Model) |
|---|---|
| Recommended Pool Volume | 55m³ to 90m³ |
| Recommended Hot Tub Volume | All standard sizes up to 2,500 litres |
| Operating Air Temperature Range | 0°C to 43°C |
| Power Supply | 230V / 1 Phase / 50Hz |
| Heating Capacity @ Air 26°C / Water 26°C | 24.0 kW |
| COP @ Air 26°C / Water 26°C | 11.8 (max) to 6.5 (min) |
| Average COP @ 50% Capacity | 10.2 |
| Heating Capacity @ Air 15°C / Water 26°C | 16.0 kW |
| COP @ Air 15°C / Water 26°C | 6.5 (max) to 4.6 (min) |
| Average COP @ Air 15°C | 6.2 |
| Rated Input Power @ Air 15°C | 0.86 to 3.48 kW |
| Rated Current @ Air 15°C | 3.74 to 15.13 A |
| Sound Pressure @ 1m (Smart Mode) | 45.8 to 57.8 dB(A) |
| Sound Pressure @ 1m (50% Capacity) | 50.1 dB(A) |
| Sound Pressure @ 10m | 25.8 to 37.8 dB(A) |
| Advised Water Flow Rate | 10 to 12 m³/hour |
| Water Connection Size | 50mm (1.5″ female plain socket) |
| Refrigerant Type | R32 (eco-friendly) |
| Heat Exchanger | Spiral titanium tube in PVC housing |
| Dimensions (L×W×H) | 954mm × 429mm × 755mm |
| Net Weight | 68 kg |
| Electrical Protection Required | 25A breaker, 30mA RCD |
| Power Cable Specification | 3 × 6mm² (hard-wired, no plug) |
Pool & Hot Tub Sizing Guide 📏
Recommended Pool Volumes:
- Minimum: 55 cubic metres (55,000 litres)
- Optimal: 60-75 cubic metres
- Maximum: 90 cubic metres (90,000 litres)
Hot Tub Compatibility: Perfect for all standard hot tubs including:
- 4-person hot tubs: 1,000-1,500 litres ✅
- 6-person hot tubs: 1,500-2,000 litres ✅
- 8-person hot tubs: 2,000-2,500 litres ✅
- Swim spas: Up to 10,000 litres ✅
Estimated Heat-Up Times ⏱
The tables below show estimated heating times for various pool and hot tub volumes. These are calculated using the standard formula and the heat pump’s 16kW capacity at typical UK ambient temperature (15°C).
⚠️ Important: These are estimates only. Actual heat-up times will vary based on:
- Starting water temperature
- Ambient air temperature and humidity
- Wind conditions and exposure
- Pool cover usage (strongly recommended)
- Insulation quality
- Water circulation rate
Pool Heat-Up Time Estimates (Air Temperature 15°C)
| Pool Volume | Temperature Rise | Estimated Time |
|---|---|---|
| 60m³ (60,000L) | 5°C (e.g., 15°C → 20°C) | 21.8 hours |
| 60m³ (60,000L) | 10°C (e.g., 15°C → 25°C) | 43.5 hours |
| 75m³ (75,000L) | 5°C (e.g., 15°C → 20°C) | 27.2 hours |
| 75m³ (75,000L) | 10°C (e.g., 15°C → 25°C) | 54.4 hours |
| 90m³ (90,000L) | 5°C (e.g., 15°C → 20°C) | 32.6 hours |
| 90m³ (90,000L) | 10°C (e.g., 15°C → 25°C) | 65.3 hours |
Hot Tub Heat-Up Time Estimates (Air Temperature 15°C)
| Hot Tub Volume | Temperature Rise | Estimated Time |
|---|---|---|
| 1,200L (4-person) | 20°C (e.g., 15°C → 35°C) | 1.7 hours |
| 1,200L (4-person) | 25°C (e.g., 10°C → 35°C) | 2.2 hours |
| 1,800L (6-person) | 20°C (e.g., 15°C → 35°C) | 2.6 hours |
| 1,800L (6-person) | 25°C (e.g., 10°C → 35°C) | 3.3 hours |
| 2,500L (8-person) | 20°C (e.g., 15°C → 35°C) | 3.6 hours |
| 2,500L (8-person) | 25°C (e.g., 10°C → 35°C) | 4.5 hours |
💡 Pro Tip: Using a quality insulated cover when not in use can reduce heat-up times by 30-50% and dramatically reduce ongoing running costs by minimizing heat loss.
Running Cost Comparison 💰
See how much you could save compared to traditional electric heating:
Typical Daily Running Costs (maintaining 28°C pool temperature)
| Heating Method | Daily Cost (8 hours) | Monthly Cost | Annual Savings vs Electric |
|---|---|---|---|
| 3kW Electric Heater | £8.40 | £252 | — |
| Traditional On/Off Heat Pump | £4.20 | £126 | £1,512 |
| Comfortline Inverter 24kW | £2.85 | £85.50 | £1,998 |
Based on UK electricity rate of £0.35/kWh, typical UK climate conditions, 8-hour daily operation during 6-month season. Your actual costs will vary based on usage patterns, ambient temperatures, and energy tariff.
The Bottom Line: The Comfortline Inverter pays for itself through energy savings, typically within 2-3 years compared to electric heating, or 3-4 years compared to standard heat pumps.
Seasonal Performance Expectations 🌤️
Spring/Autumn (Air temp 10-15°C):
- COP: 5.5-6.2
- Heating capacity: 14-16 kW
- Best for extending your swimming season economically
Summer (Air temp 20-26°C):
- COP: 9.0-11.8 (peak efficiency)
- Heating capacity: 20-24 kW
- Fastest heat-up times and lowest running costs
Winter Hot Tub Use (Air temp 0-10°C):
- COP: 4.5-5.5
- Heating capacity: 12-14 kW
- Still 4-5× more efficient than electric heating
- Auto-defrost ensures reliable operation
📄 Downloads & Documentation
Access comprehensive technical information and installation guides:
📄 Product Installation & Operation Manual (opens in new tab) Complete 21-page manual covering installation requirements, electrical specifications, operation instructions, troubleshooting guides, and maintenance procedures. Essential reading for installers and users.
📄 Product Specifications Brochure (opens in new tab) Detailed technical specifications, performance data, efficiency comparisons, and model comparison charts. Perfect for understanding the full capabilities of your heat pump.
Installation Requirements & Clearances
Minimum Clearances Required:
- Front (air intake): 500mm clear space
- Top (air outlet): 2,000mm clear overhead space
- Sides: 300mm each side
- Rear: 500mm for service access
Electrical Requirements:
- ⚡ Hard-wired installation mandatory (no plug connection)
- 25A circuit breaker required
- 30mA RCD (residual current device) essential
- Power cable: 3 × 6mm² recommended for runs up to 10m
- Professional electrician installation required
Water Connection Requirements:
- Circulation pump capacity: 10-12 m³/hour recommended
- Maximum pipe run: 10 metres between pool/tub and heat pump
- 50mm (1.5″) hard pipe connections required
- Bypass valve kit strongly recommended for hot tubs
- Filter should be installed before the heat pump
Location Considerations:
- Well-ventilated outdoor location required
- Solid, level concrete base or anti-vibration mounting frame
- Protection from direct water spray
- Condensate drainage required (unit produces water during operation)
- Avoid enclosed spaces that restrict airflow
💡 Installation Tip: The unit includes a drainage nozzle for condensate water. Connect a pipe to direct this away from the installation area to prevent pooling.
What’s Included in the Box 📦
- Comfortline Inverter Heat Pump 24kW unit
- Installation manual and operation guide
- Condensate drainage nozzle
- Mounting template
- Warranty registration card
Not Included (Available Separately):
- Installation kit with bypass valve and fittings
- Hard pipe connections (50mm)
- Electrical cable and circuit protection
- Pool cover (highly recommended)
Comprehensive Warranty Coverage 🛡️
Heat Exchanger: 5 years (parts only after 12 months) Compressor: 2 years (parts only after 12 months) All Other Parts: 2 years (parts only after 12 months) Casing: 2 years (parts only after 12 months)
Warranty covers manufacturing defects. First 12 months includes parts and labour through authorized installers. Subsequent years cover parts only. Professional installation required for warranty validity.
Frequently Asked Questions
Q: How does an inverter heat pump differ from a traditional on/off heat pump?
A: Traditional heat pumps operate at full power continuously until the target temperature is reached, then switch off completely. The Comfortline Inverter uses variable-speed technology, adjusting its output from 20% to 100% based on heating demand. This results in 40-50% lower energy consumption, quieter operation, more stable water temperature, and significantly longer component lifespan due to reduced wear from constant cycling.
Q: Can I use this heat pump for my hot tub year-round in the UK?
A: Absolutely! The Comfortline is designed to operate in temperatures down to 0°C with its intelligent auto-defrost system. While efficiency decreases in colder weather (COP of 4.5-5.5 in winter vs 9-11 in summer), it remains 4-5 times more efficient than electric heaters. Many UK hot tub owners successfully use this model throughout the year. For optimal winter performance, ensure your hot tub has a quality insulated cover and consider positioning the heat pump in a sheltered location.
Q: How long does it take to heat my hot tub from cold?
A: For a typical 1,800-litre 6-person hot tub, expect approximately 2.6 hours to heat from 15°C to 35°C in moderate ambient temperatures (15°C air temp). In warmer weather (25°C+), this reduces to under 2 hours. In colder conditions (5-10°C), allow 3-4 hours. Using an insulated cover during heating can reduce these times by 30-40%. Remember, once at temperature, the heat pump only needs to maintain it, using minimal power.
Q: What size circulation pump do I need?
A: The Comfortline 24kW requires a circulation pump delivering 10-12 cubic metres per hour (m³/h) or approximately 2,800-3,300 gallons per hour. Most hot tub circulation pumps (typically 1/8 to 1/4 HP) and pool circulation pumps (1/2 to 1 HP) easily meet this requirement. The pump must have sufficient head pressure to push water through your filtration system and the heat pump – a maximum lift of 10 metres is recommended.
Q: Is professional installation required?
A: Yes, professional installation is mandatory and required for warranty coverage. The heat pump must be hard-wired to your electrical system (no plug connection), requires proper electrical protection (25A breaker, 30mA RCD), and needs correct water flow setup with appropriate bypass valves for hot tubs. Installation by a qualified technician ensures safe operation, optimal performance, and compliance with UK electrical regulations. Improper installation can result in equipment damage, voided warranty, and safety hazards.
Q: How much noise does the heat pump make?
A: The Comfortline is exceptionally quiet for a heat pump of this capacity. At average 50% capacity (typical maintenance mode), it operates at just 50.1 dB(A) at 1 metre distance – similar to a quiet conversation. At 10 metres distance, this drops to approximately 25-30 dB(A), barely audible. The dedicated Silence Mode reduces noise by an additional 3 dB(A), making it ideal for nighttime operation in residential areas. For context, a refrigerator typically operates at 40 dB(A), and normal conversation is around 60 dB(A).
Q: Can I run the heat pump continuously?
A: Yes, the Comfortline is designed for continuous operation and actually benefits from consistent running rather than frequent on/off cycles. The inverter technology automatically adjusts output, so once your target temperature is reached, it runs at low capacity (20-30%) using minimal power to maintain temperature. This is more efficient than constantly cycling on and off like traditional heaters. Most users program their heat pump to run during off-peak electricity hours or align with their filtration pump schedule.
Q: What maintenance does the heat pump require?
A: The Comfortline requires minimal maintenance:
- Monthly: Clean air intake grille of leaves and debris, check water flow and connections
- Quarterly: Inspect electrical connections for corrosion, verify water pH is balanced (protects titanium heat exchanger)
- Annually: Professional service including refrigerant pressure check, electrical system inspection, and component testing
- Winter shutdown (if not in use): Drain water completely from heat exchanger, disconnect power, cover unit
Regular filter cleaning on your pool/tub system is essential for optimal heat pump performance, as reduced water flow triggers protection systems.
Q: Is this model compatible with saltwater pools and hot tubs?
A: Yes! The Comfortline 24kW is fully compatible with saltwater systems up to 3.5% salt concentration (35 grams per 1,000 grams of water). This is higher than the typical 0.3-0.5% used in most saltwater pools and hot tubs, providing excellent durability. The titanium heat exchanger is specifically chosen for its superior corrosion resistance against salt, chlorine, and bromine. Always maintain proper water chemistry within recommended ranges to maximize component lifespan.
Q: What’s the difference between Smart Mode and Silence Mode?
A: Smart Mode (default) adjusts heating capacity from 20% to 100%, prioritizing heating speed and efficiency. Use this for initial heat-up or during the day when noise isn’t a concern. Silence Mode limits maximum capacity to 80% and optimizes fan speed for minimal noise – approximately 3 dB(A) quieter. This mode is ideal for nighttime operation in residential areas or when neighbours are close. Both modes use the same intelligent inverter technology; the only difference is the maximum output and acoustic optimization.
Q: How does the auto-defrost feature work?
A: When operating in temperatures below 10°C, frost can form on the evaporator coil. The Comfortline monitors coil temperature continuously and automatically initiates a defrost cycle when needed. During defrost (typically 3-10 minutes), the unit temporarily reverses the refrigeration cycle to melt accumulated frost, then resumes normal heating. You’ll notice the heating indicator light flashing during this process. Manual defrost can also be triggered if needed. This system allows reliable operation down to 0°C ambient temperature without performance degradation.
Q: Can I control the heat pump remotely or with WiFi?
A: The standard Comfortline 24kW model does not include WiFi connectivity. Control is via the front-panel digital display with simple button operation. However, the heat pump can be integrated with external smart home systems using relay controls if desired. Many users find the simple manual control perfectly adequate, as once the target temperature is set, the inverter technology handles everything automatically. For remote monitoring, consider adding an external smart power monitor to your installation.
Q: What happens if there’s a power cut?
A: The heat pump includes automatic restart functionality. After power is restored, it will resume operation with your previous temperature settings. However, for safety, it’s recommended to switch off the unit during extended power outages and reset the temperature when power returns. The heat pump also includes a 3-minute delay start protection to prevent compressor damage from rapid cycling during power fluctuations.
Real Owner Experience 💬
From the Parts4Tubs Owner:
“I chose the Comfortline Heat Pump for my own DIY hot tub, and I also supply this unit to customers. After extensive testing of all available models, this was my personal choice. The cost savings have been huge – 66% cheaper on running costs and 8× faster heat-up times compared to my old 3kW electric heater.
I love the simplicity of the unit. The simple controls and lack of complicated features mean it’s a case of turning it on and setting a temperature – that’s all. For the price, I think you’ll struggle to find a better unit.
The only feature I’d consider ‘nice to have’ rather than ‘must have’ is WiFi, but given the significant cost difference for WiFi-enabled models with the same output, I was happy to go without. The inverter technology means it just works intelligently without needing constant adjustment.”
Why Buy from Parts4Tubs? 🏆
✅ Expert Knowledge – We use these products ourselves and provide honest, experienced advice
✅ UK Stock – Fast delivery across the UK and Europe
✅ Complete Support – Technical assistance before and after your purchase
✅ Installation Accessories – Full range of connection kits, bypass valves, and fittings available
✅ Trusted by DIY & Trade – Serving both home users and professional installers
Ready to Transform Your Pool or Hot Tub Experience?
The Comfortline Inverter 24kW represents exceptional value, combining cutting-edge efficiency, whisper-quiet operation, and robust reliability in a compact package. With running costs up to 66% lower than electric heating and performance that scales intelligently to your needs, it’s the smart choice for cost-conscious pool and hot tub owners.
Important: This heat pump requires professional installation. Ensure you have adequate electrical supply (25A circuit) and proper water circulation (10-12 m³/hour) before ordering. Contact us if you need assistance with installation planning or accessory selection.
 | 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 [...] | |
 | 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 [...] | |
| 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 [...] | |
| 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 [...] | |
| 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 [...] | |
| 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 [...] | |
| 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 [...] | |
| 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 [...] |
Related products
Comfortline Inverter Heat Pump
Air Source Heat Pumps
Air Source Heat Pumps
Comfortline Inverter Heat Pump
Air Source Heat Pumps
Air Source Connection Kit – Regular (2″) with Flapper Valve (for single pump system)
Comfortline Inverter Heat Pump
Air Source Heat Pumps
Air Source Heat Pumps