Comfortline Inverter Heat Pump 20kW – Ultra-Efficient Pool & Hot Tub Heating System 🔥

Transform your pool or hot tub heating with intelligent inverter technology that delivers up to 66% cost savings and 8x faster heat-up times compared to traditional electric heaters.

The Comfortline Inverter 20kW heat pump represents the pinnacle of modern pool heating technology, combining a DC inverter compressor with an advanced titanium spiral heat exchanger to deliver exceptional efficiency and whisper-quiet operation. Whether you’re heating a residential pool, commercial spa, or DIY hot tub, this unit provides reliable, cost-effective warmth throughout the swimming season.

Unlike conventional on/off heat pumps that run at a single fixed speed, the Comfortline automatically adjusts its heating capacity from 20% to 100% based on your pool’s temperature requirements. When initial heating is needed, it runs at full power for rapid temperature rise. Once your target temperature is reached, it intelligently throttles down to maintain comfort while consuming minimal electricity.

Perfect for pools and hot tubs from 45m³ to 80m³ (approximately 10,000 to 17,500 gallons), this heat pump has been personally tested and recommended by industry professionals for both DIY and professional installations.

Superior Energy Efficiency

The Comfortline achieves an average COP (Coefficient of Performance) of 11.8 under optimal conditions (Air 26°C / Water 26°C / 80% humidity), meaning every 1kW of electricity consumed produces 11.8kW of heating power. Even in cooler UK conditions (Air 15°C), it maintains an impressive COP of 6.5, delivering 6.5kW of heat for every 1kW of electricity used.

Real-world savings: Based on actual owner experience, this heat pump delivers:

• 66% reduction in running costs compared to 3kW electric heaters
• 8 times faster heat-up performance than traditional electric elements
• Up to 180 days of economical pool season operation

Intelligent Variable Speed Operation

The heart of this system is its GMMC DC Inverter Compressor, which continuously adjusts output to match heating demand:

Smart Mode (Standard Operation)

• Heating capacity ranges from 20% to 100%
• Automatically optimizes performance based on temperature differential
• Delivers rapid heating when needed, efficient maintenance when you’re at temperature

Silence Mode (Night Operation)

• Heating capacity ranges from 20% to 80%
• Operates 7dB(A) quieter than standard mode
• Perfect for overnight heating without disturbing neighbours
• Sound pressure at 50% capacity: just 49.6 dB(A) at 1 metre
• Comparable to a refrigerator or falling leaves

Environmentally Responsible Heating

This heat pump uses R32 refrigerant, which has a Global Warming Potential (GWP) of just 675 – dramatically lower than older refrigerants like R-410A (2,088 GWP) or R-22 (1,810 GWP). You’ll enjoy comfortable swimming temperatures while minimising your environmental impact.

Advanced Engineering Features 🔧

30% Larger Heat Exchanger Surface

The spiral titanium heat exchanger provides 30% more surface area than conventional straight-tube designs, enabling:

• More efficient heat transfer from refrigerant to pool water
• Better performance in variable ambient conditions
• Longer service life with superior corrosion resistance
• Safe for saltwater pools up to 3.5% salinity (35g per 1000g water)
• 5-year warranty on heat exchanger

HP Booster Technology

Proprietary HP-Booster technology increases the COP by an additional 20% compared to standard market heat pumps, ensuring you get maximum heating output for minimum electricity consumption.

Intelligent Auto-Defrost

Operates reliably down to 0°C ambient temperature with automatic defrost cycling:

• Temperature-controlled compulsory defrosting activates when needed
• Manual defrost option available for extended cold periods
• Maintains efficiency even in challenging weather conditions
• Saginomiya 4-way valve enables fast, thorough defrosting

Professional-Grade Controls

Simple, intuitive control panel with:

• Large LED temperature display showing inlet water temperature
• Easy-access up/down temperature adjustment (18°C to 40°C range)
• One-touch Smart/Silence mode switching
• Compressor operation indicator light
• Temperature display toggles between Celsius and Fahrenheit
• Built-in 3-minute compressor start delay protection

Complete Technical Specifications 📊

AMIR21 (20kW) Specifications

Electrical Requirements

⚠️ Important: Electrical installation must be performed by a qualified electrician in accordance with local building codes and regulations. A residual current device (RCD) with 30mA trip rating is mandatory.

Pool Sizing & Heat-Up Time Guide ⏱

Recommended Pool Volumes

The Comfortline 20kW model is optimally sized for:

• Minimum pool size: 45m³ (10,000 gallons / 45,000 litres)
• Maximum pool size: 80m³ (17,500 gallons / 80,000 litres)
• Ideal hot tub size: 3m³ to 6m³ (650–1,300 gallons)

Pool coverage guide by shape:

• Rectangular pools: 6m × 4m × 1.5m deep = 36m³ (suitable with cover)
• Circular pools: 5m diameter × 1.5m deep = 29m³ (suitable)
• Large residential pools: 10m × 5m × 1.5m deep = 75m³ (suitable)
• Hot tubs: Most standard 6-8 person hot tubs (2,000–4,000 litres)

Estimated Heat-Up Times

These are calculated estimates based on the heat pump’s rated capacity. Actual heat-up times will vary based on:

• Ambient air temperature and humidity
• Starting water temperature
• Use of a thermal pool cover (strongly recommended)
• Wind exposure and heat loss from pool shell
• Water flow rate and system efficiency
• Filtration hours per day (minimum 15 hours recommended)

Formula used: Time (hours) = (Pool Volume in m³ × Temperature Rise in °C × 1.16) ÷ 14.0kW (at Air 15°C)

Estimated Heat-Up Times at Air 15°C (59°F)

Estimated Heat-Up Times at Air 26°C (79°F) – Optimal Conditions

Hot Tub Heat-Up Times (Typical 3m³–4m³ Tub)

💡 Pro Tips for Faster Heating:

• Always use a thermal pool cover when heating – this can reduce heat-up time by 25-35%
• Run your filtration pump continuously during initial heat-up
• Heat during the warmest part of the day (afternoon) for maximum efficiency
• Start heating 2-3 days before you plan to use the pool
• Maintain good water flow rate (8–10 m³/hour recommended)
• Install insulated pipe lagging between pool and heat pump (maximum 10m pipe run)

📄 Downloads & Documentation

Access complete technical information, installation guides, and specifications:

📄 Comfortline Inverter Installation Manual (opens in new tab) Complete 21-page manual including detailed installation instructions, electrical wiring diagrams, troubleshooting guide, operational procedures, maintenance schedules, and full technical specifications for all AMIR models.

📄 Comfortline Inverter Product Brochure (opens in new tab) 4-page technical brochure with performance comparison charts, COP analysis, noise level measurements, environmental data, and side-by-side comparisons with conventional on/off heat pumps.

easonal Performance & Running Costs 💰

Performance Across UK Seasons

The Comfortline Inverter adapts intelligently to seasonal temperature variations:

Spring (March–May) – Air Temp 10–15°C

• COP: 5.8–6.5
• Running at 40-60% average capacity
• Moderate electricity consumption
• Ideal for extending your swimming season early

Summer (June–August) – Air Temp 18–26°C

• COP: 9.0–11.8
• Running at 20-40% average capacity for temperature maintenance
• Minimal electricity consumption
• Maximum efficiency period

Autumn (September–October) – Air Temp 10–15°C

• COP: 5.8–6.5
• Running at 50-70% average capacity
• Moderate electricity consumption
• Extends swimming season into cooler months

Winter Hot Tub Use – Air Temp 0–10°C

• COP: 4.6–5.8
• Running at 60-80% average capacity
• Higher electricity consumption but still efficient
• Auto-defrost maintains reliable operation

Estimated Running Costs vs. Electric Heater

Comparison scenario: Maintaining a 60m³ pool at 28°C over a 180-day season

Assumptions:

• Average air temperature: 18°C
• Electricity cost: £0.30 per kWh (UK average 2024/25)
• Pool covered when not in use
• 12-hour daily filtration/heating cycle

💰 Savings with Comfortline:

• 88% cheaper than electric heater (save £2,851 per season)
• 60% cheaper than standard on/off heat pump (save £583 per season)
• Payback period: Approximately 1.5 to 2 seasons vs. electric heater

Note: These are estimates based on typical usage patterns. Your actual costs will vary based on pool size, target temperature, ambient conditions, usage patterns, and local electricity rates.

Installation Requirements & Guidelines 🔧

Location & Clearance Requirements

Minimum clearances for optimal performance and maintenance access:

• Behind unit (air intake side): 500mm clear space
• Front of unit (fan outlet): 2000mm clear space
• Left and right sides: 300mm clear space
• Above unit: 2500mm clear space (no overhangs)
• Distance from pool: Maximum 10m pipe run (shorter is better)

⚠️ Critical Installation Requirements:

✅ DO:

• Install on a solid, level concrete foundation or metal stand
• Ensure excellent ventilation with unrestricted airflow
• Position away from bedrooms/noise-sensitive areas when possible
• Install in a location protected from strong winds
• Use hard plumbing (never soft hoses on inlet/outlet connections)
• Install bypass valve system for flow control
• Provide drainage for condensation water
• Use insulated pipe lagging for all connections
• Hard-wire to dedicated circuit with RCD protection

❌ DON’T:

• Install in enclosed spaces or indoors
• Position too close to walls or fences
• Place directly below windows or air intakes
• Install where snow/ice can accumulate on top
• Use undersized electrical wiring
• Connect soft hoses directly to water unions
• Position where falling leaves/debris can block airflow

Water System Requirements

Essential circulation requirements:

Filtration Pump

• Minimum flow rate: 8 m³/hour (1,760 gallons/hour)
• Maximum flow rate: 10 m³/hour (2,200 gallons/hour)
• Minimum head pressure: 10 metres
• Must run continuously during heating cycles

Plumbing Specifications

• Water connections: 50mm (1.5″) female plain socket
• Recommended pipe size: 50mm throughout
• Maximum pipe run: 10 metres between pool and heat pump
• All pipes must be insulated (foam lagging minimum 20mm thick)
• Bypass valve required for flow control and maintenance
• Check valve recommended to prevent backflow

Water Quality

• pH: 7.2–7.8 (optimal)
• Total alkalinity: 80–120 ppm
• Chlorine: Up to 3 ppm (safe with titanium exchanger)
• Salt water: Safe up to 3.5% (35g per 1000g water)
• Water should be filtered and balanced before heat pump operation

Electrical Installation

⚠️ IMPORTANT: Must be installed by qualified electrician only

Required electrical work:

• Dedicated 230V circuit from consumer unit
• 23.5A circuit breaker (Type B or C)
• 30mA residual current device (RCD)
• 3 × 6mm² power cable (for runs up to 10m)
• Proper earth bonding to heat pump chassis
• Hard-wired connection (no plug fitting)

Connection procedure:

1. Turn off main power supply
2. Remove electrical box cover on heat pump
3. Route power cable through supplied cable entry
4. Connect to terminals per wiring diagram in manual
5. Connect earth wire securely to earth terminal
6. Replace electrical box cover
7. Test RCD operation before first use

Frequently Asked Questions 🙋

General Operation

How long does it take to heat my pool? Heat-up time depends on pool volume, starting temperature, ambient air temperature, and whether you use a cover. For a 60m³ pool with a 10°C temperature rise in 15°C air, expect approximately 50 hours with a cover, or 65 hours without. Using the unit continuously with a good thermal cover will give the fastest results. See the heat-up time tables above for detailed estimates.

What temperature should I set for my pool or hot tub? Typical comfortable temperatures are:

• Swimming pools: 26–28°C (79–82°F)
• Hot tubs/spas: 37–40°C (99–104°F)
• Hydrotherapy: 33–36°C (91–97°F) The heat pump can be set anywhere from 18°C to 40°C depending on your preference.

Can I use this heat pump for a hot tub? Yes! The Comfortline 20kW is excellent for hot tubs and spas. It’s particularly well-suited for larger 6-8 person hot tubs (3,000–4,000 litres). The owner of this product has personally installed this exact model on their own DIY hot tub with excellent results – heating 8 times faster than their previous 3kW electric heater while using 66% less electricity.

Will this work with my existing pool system? Yes, the Comfortline can be integrated with most existing pool circulation systems. You’ll need a circulation pump capable of 8-10 m³/hour flow rate and standard 50mm plumbing. A bypass valve setup is recommended (available separately as an Air Source Connection Kit). It works alongside your existing pool heater if you want backup heating, or it can completely replace electric or gas heaters.

Efficiency & Performance

What does COP mean and why does it matter? COP stands for Coefficient of Performance – it’s the ratio of heat output to electrical energy input. A COP of 10 means you get 10kW of heating for every 1kW of electricity consumed. The Comfortline’s average COP of 10.2 means exceptional efficiency – about 10 times more efficient than a direct electric heater. This translates to dramatically lower running costs.

How much will it cost to run? Running costs depend on your pool size, target temperature, local climate, and electricity rates. As a rough guide, maintaining a 60m³ pool at 28°C throughout a 180-day UK season costs approximately £389 (at £0.30/kWh), compared to £3,240 for a 3kW electric heater – a saving of £2,851 per year. Your actual costs will vary, but savings of 60-88% compared to conventional heating are typical.

Does efficiency drop in cold weather? Yes, heat pump efficiency decreases as ambient air temperature drops – this is normal physics for all heat pumps. However, the Comfortline is designed to maintain good performance even in cooler conditions. At 15°C air temperature (typical UK spring/autumn), it still achieves a COP of 6.5. At 0°C, it continues to operate but at reduced efficiency with automatic defrost cycles. For year-round hot tub use, even in winter, it remains far more efficient than electric heaters.

What is Silence Mode and when should I use it? Silence Mode caps the heat pump at 80% capacity (instead of 100%) and runs the fan and compressor at lower speeds, reducing noise by approximately 7 dB(A). This is ideal for night-time operation or noise-sensitive areas. The trade-off is slightly slower heating, but the quieter operation (comparable to a refrigerator) makes it perfect for residential areas. Most users run Smart Mode during the day and switch to Silence Mode overnight.

Installation & Maintenance

Can I install this myself? The water connections can potentially be installed by a competent DIYer with good plumbing skills, but electrical installation must be performed by a qualified electrician as it requires hard-wiring to a dedicated circuit with RCD protection. The heat pump also needs proper positioning, clearances, and drainage setup. Unless you have both plumbing and electrical qualifications, professional installation is strongly recommended and may be required for warranty coverage.

What maintenance does it need? The Comfortline requires minimal maintenance:

• Keep air intake fins clean and free from debris (monthly visual check)
• Check water filter regularly and clean as needed
• Ensure drainage outlet is clear and functioning
• Inspect electrical connections annually
• Professional refrigerant pressure check every 2-3 years (optional)
• Winter shutdown requires draining water from heat exchanger if not in use

Do I need to drain it in winter? If you’re not using the heat pump during freezing weather, you must drain all water from the heat exchanger to prevent freeze damage (not covered by warranty). There’s a drain plug on the inlet pipe for this purpose. If you’re using it for a hot tub in winter, leave it running – the circulating water and automatic defrost function prevent freezing.

How close to my house can I install it? You need at least 2 metres clear space in front of the fan discharge, and 500mm behind the unit. Consider noise – while the Comfortline is quieter than most heat pumps (50 dB(A) at 50% capacity), it’s still audible. Avoid installing directly below bedrooms or near property boundaries where noise could be an issue. The Silence Mode significantly reduces noise for night-time operation.

Technical Questions

Is it compatible with saltwater pools? Yes! The titanium spiral heat exchanger is specifically designed for saltwater compatibility up to 3.5% salinity (35g per 1000g water), which covers most residential saltwater pools. Titanium is highly corrosion-resistant and provides superior longevity compared to cupro-nickel exchangers.

What’s the difference between this and a standard on/off heat pump? Standard on/off heat pumps run at 100% capacity whenever they’re on, then turn completely off when temperature is reached – like a light switch. The Comfortline’s inverter technology allows variable speed operation from 20% to 100%, adjusting continuously to match heating demand. This results in:

• 40-80% lower average power consumption
• More stable water temperature (no overshooting)
• 7 dB(A) quieter operation at average loads
• Longer component lifespan (less start/stop stress)
• Higher average seasonal COP

Will it work down to 0°C as claimed? Yes, but with reduced efficiency. At 0°C, the COP drops to approximately 4.6, and the unit will need to run defrost cycles periodically. It will still heat your pool, just more slowly and with higher electricity consumption than in warmer weather. For spring/summer/autumn pool use, this is not a concern. For year-round hot tub heating in cold climates, it remains far more efficient than electric heaters even at 0°C.

What warranty is included?

• Heat exchanger: 5 years (parts only)
• Compressor: 2 years (parts only)
• All other components: 2 years (parts only)
• Casing: 2 years Note that warranty is parts only after the first 12 months. Labour is not covered. Warranty requires proper installation by qualified professionals and proof of annual maintenance.

Troubleshooting

What should I do if it shows an error code? The Comfortline has built-in diagnostics that display error codes on the control panel (E1, E2, P1, etc.). Common issues:

• E3: No water flow – check pump is running and bypass valve is open
• E5: Power supply voltage issue – verify mains voltage is stable
• E6: Insufficient water flow – clean filter, check for blockages
• Ed: Anti-freezing reminder – normal in cold weather, unit is protecting itself Refer to the comprehensive troubleshooting section in the manual (pages 17-18) for complete error code descriptions and solutions.

Why is my heat pump not reaching the set temperature? Several factors can affect performance:

• Pool is too large for the heat pump capacity (check sizing guide)
• No thermal cover, allowing excessive heat loss
• Insufficient water flow rate through heat exchanger
• Ambient air temperature is very low (reducing capacity)
• Heat loss from pool exceeds heating capacity (check for leaks, improve insulation)
• Bypass valve not properly adjusted Check these factors first before assuming a fault.

What’s in the Box 📦

Your Comfortline Inverter Heat Pump package includes:

✅ Comfortline AMIR21 20kW heat pump unit (fully assembled) ✅ User manual with installation instructions ✅ Warranty registration card ✅ Drainage nozzle with clip for condensation discharge ✅ Electrical connection components ✅ Mounting bolt specifications (M10)

Not included (required for installation):

• Circulation pump (8-10 m³/hour capacity recommended)
• Water connections and plumbing (50mm/1.5″ pipe and fittings)
• Bypass valve system (recommended – available separately)
• Electrical wiring and circuit protection
• Concrete pad or mounting stand
• Insulated pipe lagging
• Pool thermal cover (highly recommended)

Optional recommended accessories:

• Air Source Connection Kit with bypass valve and plumbing (available separately)
• Mounting bracket or stand for elevated installation
• Acoustic enclosure for additional noise reduction
• Additional insulation for extreme cold climates

UK & Europe Delivery Information 🚚

Availability: UK and Europe only (Model AMIR21)

Shipping Notes:

• UK mainland delivery available
• Additional freight costs apply for European destinations
• Professional installation recommended (electrician required for wiring)
• Consider access for delivery – unit weighs 68kg and measures 954mm × 359mm × 748mm

Pre-Installation Checklist:

• Confirm adequate space for installation with proper clearances
• Ensure your electrical panel can accommodate a 23.5A dedicated circuit
• Verify your circulation pump meets minimum 8 m³/hour flow requirement
• Check local planning/building regulations (usually exempt, but verify)
• Order bypass kit or connection components in advance
• Prepare concrete pad or mounting location

About This Product ℹ️

Real-World Testimonial

This Comfortline Inverter 20kW model was personally selected and installed by the team at Parts4Tubs for their own DIY hot tub project, and they also supply this unit to customers regularly. Here’s why they chose it:

“For me, the cost savings that I have made with this model have been huge – 66% cheaper on my hot tub running costs and 8x faster on the heat-up times versus my old 3kW electric heater.”

“I love the simplicity of the unit. The simple controls, the almost lack of complicated features means it is a case of turning it on and setting a temperature, that is all.”

“For the price, I think you will struggle to find a better unit.”

This is a product that industry professionals trust for their own personal use – and that confidence is reflected in the thousands of satisfied customers using Comfortline heat pumps across the UK and Europe.

Why Inverter Technology Matters 💡

Traditional heat pumps work like a simple on/off switch – they’re either running at 100% capacity or completely off. This creates several problems:

❌ Constantly cycling on and off wastes energy at startup ❌ Temperature overshooting (water gets hotter than you want) ❌ Noisy operation at full power ❌ Faster component wear from frequent start/stop cycles ❌ Poor efficiency at maintaining temperature

The Comfortline’s DC inverter compressor solves all these issues:

✅ Variable speed operation from 20% to 100% capacity ✅ Smart heating: Full power for fast initial heat-up, then throttles down to maintain temperature ✅ Ultra-quiet operation: Average running at 50% capacity produces just 49.6 dB(A) – quieter than a refrigerator ✅ Superior efficiency: Average COP of 10.2 across the season vs. 5.0 for on/off models ✅ Longer component life: Gentle operation with minimal start/stop cycling ✅ Perfect temperature control: No overshooting or undershooting your target

The technology is similar to modern inverter air conditioners and variable-speed heat pumps for home heating – proven, reliable, and dramatically more efficient than older fixed-speed technology.

Environmental & Safety Certifications 🌍

Eco-Friendly R32 Refrigerant

• Global Warming Potential: 675 (vs. 2,088 for R-410A)
• Ozone Depletion Potential: 0
• Complies with F-Gas regulations
• More efficient heat transfer properties than older refrigerants

Safety Features

• High pressure and low pressure protection
• Exceeding low temperature auto-stop protection
• Temperature-controlled compulsory defrosting
• Anti-freeze protection
• Over-current protection
• Compressor overload protection
• Automatic fault diagnosis with error code display
• 3-minute start delay to protect compressor

Build Quality

• Steel body construction with corrosion-resistant plastic coating
• International brand GMMC compressor (proven reliability)
• Saginomiya 4-way valve (Japanese quality)
• Titanium spiral heat exchanger (5-year warranty)
• IP24 rated electrical protection
• Designed for outdoor installation in all weather conditions

Customer Support & Warranty 📞

Comprehensive Warranty Coverage

• Heat Exchanger: 5 years parts warranty
• Compressor: 2 years parts warranty
• All Other Components: 2 years parts warranty
• Casing: 2 years warranty

Important warranty notes:

• Parts only coverage after first 12 months
• Labour/installation not covered
• Requires professional installation by qualified technician
• Valid proof of purchase required
• Annual maintenance recommended for warranty compliance
• Freeze damage from improper winterisation not covered
• Improper installation or electrical issues void warranty

Support Resources

For technical support, installation questions, or warranty claims:

• Refer to comprehensive 21-page installation and operation manual
• Review troubleshooting guide (pages 17-18 of manual)
• Check error code reference for diagnostic assistance
• Contact your installer for first-line support
• Parts and technical assistance available through Parts4Tubs

Order Preparation Checklist ✅

Before purchasing, confirm you have:

Electrical Requirements

• ☐ Available 230V single-phase power supply
• ☐ Space in consumer unit for 23.5A breaker with 30mA RCD
• ☐ 6mm² cable routing capability to installation location
• ☐ Qualified electrician available for installation

Plumbing Requirements

• ☐ Circulation pump with 8-10 m³/hour capacity
• ☐ 50mm (1.5″) plumbing capability
• ☐ Less than 10m pipe run between pool and heat pump location
• ☐ Bypass valve system or connection kit (available separately)

Installation Site

• ☐ Concrete foundation or mounting stand (minimum 1000mm × 500mm)
• ☐ 500mm clearance behind unit
• ☐ 2000mm clearance in front of unit
• ☐ 300mm clearance on sides
• ☐ Good ventilation with no obstructions
• ☐ Drainage provision for condensation water
• ☐ Distance from noise-sensitive areas considered

Pool/Hot Tub Requirements

• ☐ Pool/tub volume between 45m³ and 80m³ (or 3-6m³ for hot tubs)
• ☐ Thermal pool cover available (essential for efficiency)
• ☐ Balanced water chemistry
• ☐ Adequate filtration system

Ready to transform your pool or hot tub heating? Order your Comfortline Inverter 20kW today and start enjoying ultra-efficient, whisper-quiet comfort with running costs up to 88% lower than electric heaters! 🔥💙

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