Comfortline Inverter Heat Pump 16 kW – Ultra-Efficient Air Source Pool & Hot Tub Heater 🌊

Transform your swimming pool or hot tub experience with the Comfortline AMIR17 16kW inverter heat pump – the smart choice for year-round comfort and massive energy savings.

Unlike traditional on/off heat pumps that waste energy cycling at full power, the Comfortline uses intelligent DC inverter technology to match heating output to your exact needs. The result? Up to 60% lower running costs, whisper-quiet operation, and faster heat-up times that put you in hot water sooner.

Whether you’re building a DIY hot tub or upgrading your pool’s heating system, this is the same model our founder chose for his own tub – and the same unit trusted by hundreds of satisfied customers across the UK and Europe.

Unmatched Efficiency Saves You Money

With a Coefficient of Performance (COP) reaching 11.2 in optimal conditions and averaging 9.7 at typical temperatures, every 1kW of electricity delivers up to 11kW of heating power. Compare that to traditional on/off heat pumps with COPs around 5, and you’ll understand why customers report 60%+ savings on heating costs.

Intelligent Variable Speed Technology

The AMIR17 doesn’t just turn on and off – it thinks. The DC inverter compressor adjusts capacity from 20% to 100% based on real-time demand:

• Season Start / Initial Heat-Up: Runs at 100% capacity for maximum speed
• Temperature Maintenance: Drops to 20-50% capacity for silent, efficient operation
• Result: Lower electricity bills, longer equipment life, and better temperature stability

Whisper-Quiet Operation for Peaceful Relaxation 🔇

Thanks to the DC inverter compressor and variable-speed fan, the Comfortline runs 7 dB(A) quieter than standard heat pumps at 50% capacity. That’s the difference between a normal conversation and falling leaves – your neighbors will thank you.

Sound Levels:

• Smart Mode (100% capacity): 45.2–56.3 dB(A) at 1 meter
• Average 50% capacity: 48.7 dB(A) at 1 meter
• At 10 meters distance: Just 25.2–36.3 dB(A)
• Silence Mode: Locks to 80% max capacity for nighttime running – even quieter!

Built Tough for UK & European Climates

• Operating Range: 0°C to 43°C air temperature
• Auto-Defrost Function: Keeps working even in near-freezing conditions
• Steel body with corrosion-resistant coating – built to last
• Salt water safe up to 3.5% salinity (35g per 1000g water)

Complete Technical Specifications 📊

Performance & Capacity (AMIR17 Model)

*Optimal Conditions: Air 26°C, Water 26°C, Humidity 80%
†Real-World Conditions: Air 15°C, Water 26°C, Humidity 70%

Pool & Hot Tub Sizing

Perfect for:

• Medium to large residential pools (35,000–65,000 litres)
• Large hot tubs and swim spas (2,000–5,000 litres)
• Commercial spa installations

Physical Specifications & Installation

Electrical Specifications

⚠️ IMPORTANT: Professional electrical installation required. Must be earthed properly and protected by appropriate breakers and RCD.

Environmental & Refrigerant

📄 Downloads & Documentation

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

📄 Comfortline Inverter Installation Manual (opens in new tab)
Complete installation instructions, wiring diagrams, dimensions, operating procedures, troubleshooting guide, and maintenance schedules. Essential reading for DIY installers and professional technicians. 21 pages.

📄 Comfortline Inverter Product Brochure (opens in new tab)
Full model comparison chart, technical specifications for all AMIR models (07-24kW), performance data, COP ratings, and efficiency comparisons vs traditional heat pumps. Quick reference guide. 3 pages.

Advanced Features & Technology 💡

Superior Heat Exchanger Design

The Comfortline’s spiral titanium tube heat exchanger provides 30% more heat transfer surface area compared to standard straight-tube designs. Combined with HP-BOOSTER technology, this delivers:

• 20% higher efficiency than comparable on/off heat pumps
• Faster heat-up times
• Better low-temperature performance
• Superior corrosion resistance (titanium construction)

Two Operating Modes for Every Situation

🚀 Smart Mode (Default) – Maximum Performance

• Variable capacity: 20% to 100%
• Fastest heat-up times
• Intelligent optimization based on demand
• Best for initial heating or rapid temperature recovery

🌙 Silence Mode – Nighttime Operation

• Capacity limited to 20–80% maximum
• 3 dB(A) quieter than Smart Mode
• Ideal for overnight running in residential areas
• Still provides excellent heating efficiency

Switch between modes with a single button press on the control panel.

Premium Components for Reliability

• GMMC DC Inverter Compressor – Industry-leading efficiency and longevity
• Saginomiya 4-Way Valve – Superior defrost performance
• International-brand components throughout
• Simple, intuitive control panel – no complicated menus or Wi-Fi to configure

Built-In Protection Systems

• High/low pressure protection
• Low temperature auto-stop
• Compressor start delay (3 minutes)
• Water flow protection
• Overheat protection
• Phase protection (three-phase models)
• Complete fault diagnostic system with error codes

Real-World Performance: Heat-Up Time Estimates ⏱️

How long will it take to heat MY pool or hot tub? Here are calculated estimates based on the AMIR17’s 11.0 kW heating capacity at real-world conditions (15°C air temperature):

Swimming Pool Heat-Up Times

Hot Tub / Swim Spa Heat-Up Times

Formula Used: Time (hours) = (Volume in m³ × Temperature Rise °C × 1.16) ÷ 11.0 kW

⚠️ IMPORTANT DISCLAIMERS:

• These are theoretical estimates based on continuous operation at 15°C air temperature
• Actual times vary significantly based on: ambient air temperature, wind conditions, pool insulation, use of pool covers, initial water temperature, and heat losses during heating
• Best practices for faster heating: Use a quality pool cover, heat overnight when ambient temps are stable, ensure proper water circulation, minimize pool/tub usage during heat-up
• For precise heating schedules, account for your local climate and installation specifics

Energy Cost Comparison: Comfortline vs Traditional Heating 💰

See the dramatic savings for yourself:

Annual Running Cost Comparison (Example: 45m³ pool, 180-day season)

Calculations based on UK electricity rate of £0.24/kWh and gas at £0.06/kWh. Actual costs vary by location, usage patterns, and energy tariffs.

Real Customer Result: Our founder achieved 66% cost savings and 8× faster heat-up times compared to his old 3kW electric heater.

Installation Requirements & Guidelines 🔧

Site Selection Checklist

✅ Good ventilation – No enclosed spaces or indoor installation
✅ Level, solid surface – Concrete pad or strong anti-rust brackets
✅ Minimum clearances: Front 200cm, Sides 50cm, Rear 50cm
✅ Condensation drainage – Unit produces condensate water; drainage required
✅ Close to pool/tub – Maximum 10 meters of pipe run recommended
✅ Electrical access – Hard-wired connection with proper earthing

What You’ll Need

Included with Heat Pump:

• Main unit with control panel
• Drainage nozzle for condensate
• User manual and installation guide

Required (Not Included):

• Circulation pump (6.5–8.5 m³/hour flow rate, 10m+ head pressure)
• 50mm rigid PVC pipe and fittings
• Bypass valve setup (we offer complete connection kits separately)
• Electrical wiring (3×4mm² cable, breakers, RCD)
• Mounting bolts (M10) for concrete pad
• Pool cover (highly recommended for efficiency)

Optional but Recommended:

• Pipe insulation (minimizes heat loss between pool and heat pump)
• Filter system integration
• Water flow switch (for safety shut-off)

Installation Steps Overview

1. Prepare mounting location with proper clearances
2. Install circulation pump if not already present
3. Connect water pipes using rigid 50mm PVC (soft pipes not supported on unions)
4. Install bypass valve between pool circulation and heat pump
5. Connect electrical supply (professional electrician required)
6. Earth the unit properly and install RCDs/breakers
7. Test water flow and check for leaks
8. Power on and configure desired temperature settings

⚠️ CRITICAL: Always start the circulation pump BEFORE switching on the heat pump. Always turn OFF the heat pump BEFORE stopping the pump. Failure to follow this sequence can damage the unit.

💡 Professional Installation Recommended: While experienced DIYers can install this unit, we recommend professional installation to ensure proper electrical connections, water flow rates, and warranty compliance.

Operating Modes & Control Panel Guide 🎛️

Simple, Intuitive Controls

The Comfortline features a straightforward control panel that anyone can master:

Control Buttons:

• Power On/Off – Master power button
• Mode Selection – Toggle between Smart Mode and Silence Mode
• Up/Down Arrows – Set desired water temperature (18–40°C)
• Temperature Display – Shows current inlet water temperature (or set temp when adjusting)
• Compressor Indicator – Green light when compressor actively running

Display Functions:

• Celsius / Fahrenheit switchable (press Up + Down for 5 seconds)
• Fault code display for troubleshooting
• Target temperature flashes when adjusting settings

Operating Tips for Maximum Efficiency

✅ Use a pool/hot tub cover – Reduces heat loss by 50-70%
✅ Set realistic temperatures – Each degree higher = 10% more running cost
✅ Run during off-peak hours – Take advantage of cheaper electricity tariffs
✅ Maintain proper water chemistry – Prevents scale buildup on heat exchanger
✅ Keep air intakes clear – Blocked evaporator reduces efficiency dramatically
✅ Insulate connecting pipes – Every meter of uninsulated pipe loses heat

Seasonal Operation Guide

Summer Operation (15–25°C ambient):

• Unit operates at peak efficiency (COP 6+)
• Smart Mode for fastest heating
• Can maintain temperature at 30-50% capacity
• Minimal runtime needed

Spring/Autumn (5–15°C ambient):

• Efficiency decreases slightly but still excellent
• May need longer runtime for same results
• Auto-defrost activates as needed
• Consider Silence Mode overnight

Winter Operation (0–5°C ambient):

• Still functional but efficiency reduced
• Defrost cycles occur more frequently
• Best for hot tubs rather than large pools
• Cover is absolutely essential
• Consider alternative heating for sub-zero days

Comprehensive FAQ – Your Questions Answered ❓

General Operation & Performance

Q: What size pool or hot tub is this heat pump suitable for?
A: The AMIR17 16kW model is ideally suited for pools between 35,000–65,000 litres (35–65 m³) or hot tubs/swim spas up to 5,000 litres. For smaller pools (under 35m³), consider the AMIR13 13kW model. For larger pools (over 65m³), look at the AMIR21 20kW or AMIR24 24kW models.

Q: How much does it cost to run compared to an electric heater?
A: Customers typically report 60-82% lower running costs compared to traditional electric heaters. At UK electricity rates (£0.24/kWh), the Comfortline averages £1.68/day vs £7.20/day for a 3kW electric heater on a 45m³ pool.

Q: Will this work in winter / cold weather?
A: Yes, the Comfortline operates down to 0°C air temperature with automatic defrost. However, efficiency decreases as temperatures drop. It’s most efficient between 15-25°C ambient air. For UK winter hot tub use, it absolutely works but expect longer runtime and reduced COP. For large pools, consider supplementary heating or only using the pool in warmer months.

Q: How loud is it? Will it disturb my neighbors?
A: The Comfortline is exceptionally quiet for a heat pump. At typical 50% capacity, it measures just 48.7 dB(A) at 1 meter – roughly equivalent to a refrigerator hum. At 10 meters distance, it’s only 25-36 dB(A). Silence Mode reduces noise by an additional 3 dB(A). Many customers run it overnight without complaints. For context, a normal conversation is 60 dB(A).

Q: What’s the difference between Smart Mode and Silence Mode?
A: Smart Mode allows the compressor to run from 20-100% capacity for maximum heating performance. Silence Mode limits capacity to 20-80% maximum, reducing fan and compressor speeds for quieter operation (3 dB(A) reduction). Use Smart Mode for initial heat-up or daytime operation; switch to Silence Mode for overnight running in residential areas.

Q: Do I need Wi-Fi or smart controls?
A: No – the Comfortline uses a simple, reliable control panel without Wi-Fi or app connectivity. While Wi-Fi can be convenient, the lack of digital complications means fewer things to go wrong. Simply set your desired temperature and operating mode, and the unit handles everything automatically.

Installation & Requirements

Q: Can I install this myself or do I need a professional?
A: Electrical work MUST be done by a qualified electrician due to hard-wiring requirements and safety regulations. The plumbing can be DIY if you’re experienced with pool/hot tub systems, but we recommend professional installation for water flow optimization and warranty compliance. Improper installation can void your warranty.

Q: What circulation pump do I need?
A: You need a pump capable of 6.5–8.5 m³/hour flow rate with at least 10 meters of head pressure. Most modern pool/hot tub circulation pumps meet these specs. Check your existing pump specs or consult the installation manual for compatibility.

Q: Do I need a bypass valve?
A: Yes, absolutely. A bypass valve lets you isolate the heat pump for maintenance and regulates water flow to prevent damage. We offer complete Air Source Connection Kits with properly sized bypass valves, pipes, and fittings designed specifically for this heat pump.

Q: How close does the heat pump need to be to my pool/hot tub?
A: We recommend maximum 10 meters of pipe run between the pool/tub and heat pump. Longer distances increase heat loss, reduce efficiency, and can affect water flow rates. Always insulate pipes to minimize thermal losses.

Q: Can I use this with a saltwater pool/hot tub?
A: Yes! The titanium spiral heat exchanger is safe for salt water up to 3.5% salinity (35 grams per 1000 grams water). This is higher than typical pool salinity (0.3-0.5%), so it’s absolutely fine for saltwater systems.

Q: What electrical supply do I need?
A: 230V single-phase 50Hz supply with a 20.5A breaker, 30mA RCD protection, and 3×4mm² cable. The unit MUST be hard-wired (no plug permitted) and properly earthed. This is a job for a qualified electrician familiar with outdoor pool equipment.

Efficiency & Running Costs

Q: What does COP mean and why does it matter?
A: COP (Coefficient of Performance) measures efficiency. A COP of 11.2 means for every 1kW of electricity used, the heat pump delivers 11.2kW of heating. The Comfortline’s variable inverter technology maintains high COPs across different capacities (20-100%), unlike on/off heat pumps that only achieve peak COP at full power then shut down wastefully.

Q: Why are there different COP ratings listed?
A: COP varies with operating conditions. The spec sheet shows:

• Optimal conditions (Air 26°C / Water 26°C / Humidity 80%): Best-case scenario, COP up to 11.2
• Real-world conditions (Air 15°C / Water 26°C / Humidity 70%): More typical UK climate, COP around 5.9

Expect your COP to fall somewhere in this range depending on weather. Even at the lower end, it’s still 5-6× more efficient than electric resistance heating.

Q: How much can I actually save on my energy bills?
A: Savings depend on what you’re comparing against and your usage patterns, but here are real examples:

• vs 3kW Electric Heater: 60-82% cost reduction (our founder saved 66%)
• vs On/Off Heat Pump: 30-50% cost reduction
• vs Gas Boiler: 20-40% cost reduction

A typical 45m³ pool over a 180-day season could save £800-1,300 annually compared to electric heating.

Maintenance & Warranty

Q: What maintenance does this unit require?
A: Minimal! Regular maintenance includes:

• Keep air intakes and outlets clear of debris
• Check and tighten electrical connections annually
• Inspect water connections for leaks
• Clean evaporator coils with household detergent (power OFF first)
• Drain water from heat exchanger before winter storage
• Check titanium heat exchanger for scale buildup (if in hard water area)

No refrigerant top-ups needed – it’s a sealed system.

Q: What’s covered under warranty?
A: Parts only warranty after first 12 months:

• Heat Exchanger: 5 years
• Compressor: 2 years
• All other parts: 2 years
• Casing: 2 years

Labour is not included. Installation and maintenance must be performed by qualified personnel for warranty validity.

Q: What should I do if I get an error code?
A: The control panel displays fault codes (E1, E2, P1, F1, etc.) for diagnostics. Common issues like “E3” (no water flow) often resolve by checking your circulation pump. The installation manual includes a complete error code table. For persistent faults, contact your installer or our technical support. Never attempt to open or repair the refrigerant system yourself.

Q: How do I winterize the unit if I’m not using it?
A: For winter shutdown:

1. Switch off main power supply at breaker
2. Open the inlet pipe union to drain all water from the heat exchanger
3. Leave unions slightly open to prevent ice formation
4. Cover the unit with a weatherproof cover (but allow ventilation)
5. Store controller manual safely for spring reference

Failure to drain water can cause the titanium heat exchanger to crack in freezing temperatures, which is NOT covered under warranty.

Why Customers Choose Parts4Tubs 🏆

Real Experience, Real Results This isn’t just another product we sell – it’s the exact model our founder installed in his own DIY hot tub. We use it, we trust it, and we’ve helped hundreds of customers achieve the same incredible savings.

UK & Europe Stock Fast delivery across the UK with additional freight options for European customers. UK warranty support included.

Expert Support Not sure if this model is right for your pool or hot tub? Need installation advice? Our team has hands-on experience with every heat pump we sell. We’re here to help you succeed.

Complete System Solutions We stock everything you need: circulation pumps, bypass valve kits, pipe fittings, insulation, and control systems. One-stop shopping for your entire heat pump installation.

Honest Reviews & Guidance We publish real pros and cons, genuine specifications, and transparent comparisons. Our goal is to help you make the best choice for YOUR situation – even if it’s a different model than this one.

Product Warranty Information 📜

Manufacturer’s Warranty Coverage – Parts Only After 12 Months:

Important Warranty Conditions:

• Installation must be performed by qualified personnel following manufacturer guidelines
• Hard-wired electrical connection required (no plug installations)
• Proper earthing and RCD protection mandatory
• Water must be drained from unit before freezing temperatures
• Regular maintenance required (records may be requested for warranty claims)
• Warranty covers parts replacement only; labour charges not included
• Damage from improper installation, incorrect voltage, or lack of maintenance is not covered

Package Contents & What’s Included 📦

Included in the Box:

• Comfortline AMIR17 16kW inverter heat pump (fully assembled)
• Integrated control panel (pre-installed)
• 50mm female plain socket water connections (inlet/outlet)
• Condensate drainage nozzle
• Installation and operation manual (English)
• Warranty documentation

Not Included (Available Separately):

• Circulation pump
• Bypass valve and plumbing kit (Air Source Connection Kits available here)
• 50mm rigid PVC pipes, elbows, and couplers
• Electrical wiring, breakers, and RCD protection
• Concrete mounting pad or brackets
• Pool/hot tub cover
• Water flow switch (recommended for safety)
• Pipe insulation

💡 Complete Installation Kits Available: We offer pre-configured connection kits with everything you need to plumb the heat pump to your pool or hot tub. Check our Air Source Heat Pump accessories section for compatible kits.

Model Comparison Chart – Find Your Perfect Size 📏

Can’t decide if the 16kW AMIR17 is right for your pool? Here’s how it compares to other models in the Comfortline Inverter range:

Sizing Tip: Choose based on your pool volume, not just area. A pool that’s 8m × 4m × 1.5m deep = 48 m³ volume. The AMIR17 would be ideal. When in doubt, size up slightly – the inverter technology means oversized units run efficiently at lower capacities.

Frequently Bought Together 🛒

Customers purchasing the Comfortline AMIR17 also frequently add:

• Air Source Connection Kit (Large) – Complete bypass valve, pipes, and fittings kit sized for 16kW heat pumps
• 2-inch Flapper Check Valve – Prevents backflow and protects your system (essential for hot tubs)
• Circulation Pump (6.5-8.5 m³/hr) – Properly sized pump for optimal heat pump performance
• Thermal Pool/Hot Tub Cover – Reduces heat loss by 50-70%, dramatically improving efficiency
• 50mm Pipe Insulation – Minimizes heat loss on connecting pipes
• Water Flow Switch – Automatic safety shut-off if water flow stops

Ready to Save Up to 60% on Your Heating Costs? 🎯

The Comfortline AMIR17 16kW Inverter Heat Pump isn’t just an upgrade – it’s an investment in years of affordable, comfortable swimming or hot tubbing. With proven reliability, exceptional efficiency, and whisper-quiet operation, it’s the smart choice for anyone serious about reducing energy costs without sacrificing comfort.

What You Get: ✅ Up to 11.2 COP efficiency – industry-leading performance
✅ 60%+ savings vs electric heating
✅ Whisper-quiet operation (48.7 dB(A) average)
✅ Built for UK & European climates (0-43°C operation)
✅ DC inverter technology for unmatched efficiency
✅ 5-year heat exchanger warranty
✅ Salt water safe titanium construction
✅ Expert UK support from a team that uses what we sell

UK & Europe Delivery Available – Additional freight costs apply for European destinations.

Have questions about sizing, installation, or compatibility? Our team has hands-on experience with every product we sell. Get in touch – we’re here to help you make the right choice.

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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
	Air Source Connection Kit – Regular (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 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  [...]	£225.00 Max: Min: 1 Step: 1 Add to cart
	Air Source Connection Kit – Regular (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 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  [...]	£245.00 Max: Min: 1 Step: 1 Add to cart
	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
	Air Source Connection Kit – 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 [...]	£325.00 Max: Min: 1 Step: 1 Add to cart
	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