IPT16BLY I-PAC+ 16 Side Outlet Inverter Heat Pump – 3-Phase All-Year-Round 16kW Commercial Grade 🌊

Transform your commercial hot tub or luxury spa experience with professional-grade, whisper-quiet heating that works flawlessly in all seasons.

The IPT16BLY represents the pinnacle of commercial-grade pool and hot tub heating technology. Engineered specifically for year-round operation in the demanding UK climate, this 3-phase powerhouse delivers consistent, efficient heating even in temperatures as low as -10°C. Unlike standard “extended season” models, this is a true all-weather heating solution.

Perfect For:

✅ Commercial Hot Tubs & Spas – Hotels, leisure centers, gyms
✅ Luxury Residential Installations – High-end home spa systems
✅ Swim Spas – Larger water volumes requiring consistent heating
✅ Year-Round Operations – Businesses requiring reliable winter heating
✅ High-Demand Environments – Multiple daily users, frequent temperature changes

🔥 Exceptional Heating Performance That Adapts to Your Needs

Intelligent Inverter Technology

Unlike traditional on/off heat pumps that constantly cycle between full power and standby, the IPT16BLY uses advanced DC inverter technology to precisely match heating output to your exact requirements.

What This Means for You:

• Average COP of 10.3 – Over twice as efficient as conventional heaters
• 20-100% modulation range – Seamlessly adjusts power from minimum to maximum
• Smooth temperature control – No temperature swings or overshooting
• Reduced wear and tear – Longer equipment lifespan due to gentle operation
• Lower running costs – Only uses the energy actually needed

Real-World Performance Data

Standard Operating Conditions (Air 27°C, Water 27°C, 80% RH):

• Heating Capacity: 21.0 kW
• COP Range: 14.8 – 6.4
• Average COP at 50% Speed: 10.3

Cooler Weather Performance (Air 15°C, Water 26°C, 70% RH):

• Heating Capacity: 14.5 kW
• COP Range: 7.1 – 4.6
• Average COP at 50% Speed: 6.3

Cooling Mode (Air 35°C, Water 28°C, 80% RH):

• Cooling Capacity: 9.5 kW

🤫 Whisper-Quiet Operation – Your Guests Won’t Know It’s Running

Two Intelligent Operating Modes

🚀 Boost Mode

• Full 20-100% power range
• Fastest heat-up times
• Ideal for startup or rapid temperature recovery
• Perfect for busy commercial schedules

🌙 Whisper Mode

• 20-80% power range
• 9-11 dB(A) quieter than traditional heat pumps
• Only 20.4 to 33.7 dB(A) at 10 meters – quieter than a whisper
• Perfect for daytime operation near guest areas
• Maintains tranquility in spa environments

Decibel Comparison:

• Whisper Mode (10m): 20.4-33.7 dB(A) – Quieter than rustling leaves
• Standard Heat Pump: 30-45 dB(A)
• Normal Conversation: 60 dB(A)

🌍 Eco-Friendly R32 Refrigerant – Future-Proof & Compliant

Environmental Excellence

The IPT16BLY uses R32 refrigerant, representing the future of sustainable heating:

✅ Low Global Warming Potential (GWP) – Only 675 (vs 2088 for R410A)
✅ Zero Ozone Depletion Potential (ODP)
✅ F-Gas Compliant – Meets 2025 phase-down requirements
✅ Superior Cold Weather Performance – Better efficiency at low temperatures
✅ Lower Refrigerant Volume – Requires less charge per kW
✅ Easier to Recycle & Reuse – Environmentally responsible end-of-life

📱 Smart Wi-Fi Control – Manage Your Spa from Anywhere

Total Remote Control at Your Fingertips

Wi-Fi Connectivity Standard – No additional modules required!

Control from Anywhere:

• 📱 Smartphone App – iOS and Android compatible
• ⚙️ Adjust temperature settings remotely
• 📊 Monitor real-time performance
• 🔄 Switch between heating/cooling modes
• ⏰ View operating status and error codes
• 🌡️ Pre-heat before guest arrival

Perfect for Commercial Operators:

• Set optimal temperatures before opening hours
• Monitor multiple units from one device
• Respond to guest requests without site visits
• Track energy consumption patterns
• Receive alerts for maintenance needs

📥 Downloads & Documentation

Access comprehensive technical information and installation guides:

📄 Owner & Installation Manual (opens in new tab)
Complete 43-page guide covering installation procedures, electrical specifications, plumbing requirements, Wi-Fi setup, troubleshooting, maintenance schedules, winterization procedures, and warranty conditions. Essential reading for installers and facility managers.

📄 Inverter Heat Pump Product Brochure (opens in new tab)
Product overview featuring the complete I-PAC range, comparative performance data, sizing graphs, technical specifications, and feature comparisons. Includes information on decibel levels, inverter technology benefits, and R32 refrigerant advantages.

⚡ Powerful 3-Phase Performance with Smooth Operation

Why 3-Phase Matters for Commercial Installations

Electrical Advantages:

• ✅ Eliminates massive inrush currents – Protects your electrical system
• ✅ More efficient power distribution – Lower operating costs
• ✅ Reduced voltage drops – Stable performance even during peak demand
• ✅ Smoother compressor operation – Less vibration and noise
• ✅ Better suited for commercial electrical systems

Power Specifications:

• Supply Required: 400V 3-Phase 50Hz
• Rated Input Power: 0.41-3.15 kW
• Rated Input Current: 0.59-4.56 A
• Maximum Input Current: 5.8 A
• Rated Fuse/MCB: Type C 10A
• RCD Type: Type B 30mA

🏗️ Built to Last – Premium Construction for Harsh Environments

Robust Aluminium Alloy Construction

• Marine-grade aluminium alloy casing – Exceptional corrosion resistance
• Weather-resistant design – Withstands harsh outdoor conditions
• Compact footprint – 954mm (W) x 429mm (D) x 755mm (H)
• Professional finish – Suitable for visible commercial installations
• Secure mounting points – Stable installation on concrete or brackets

High-Efficiency Titanium Heat Exchanger

• Twisted titanium tube design – Maximum heat transfer efficiency
• Corrosion-proof construction – Ideal for treated spa water
• Long service life – Withstands continuous commercial use
• Resistant to chemical damage – Compatible with all standard sanitizers

🔄 Versatile Multi-Mode Operation

Three Operating Modes for Ultimate Flexibility

🔥 Heat Only Mode

• Standard pool/spa heating
• Temperature range: 18-40°C
• Optimized for heating efficiency

❄️ Cool Only Mode

• Summer cooling capability
• Temperature range: 12-30°C
• Prevents overheating in hot weather

🔄 Heat/Cool Auto Mode

• Automatic temperature maintenance
• Full range: 12-40°C
• Switches between heating and cooling as needed
• Perfect for variable climates

💰 Heat-Up Time Estimates & Running Costs

How Long to Heat Your Hot Tub?

These estimates help you plan heating schedules and set customer expectations:

Water Volume	Temperature Rise	Estimated Heat-Up Time*
1,500 litres	5°C rise	1.2 hours
1,500 litres	10°C rise	2.4 hours
2,000 litres	5°C rise	1.6 hours
2,000 litres	10°C rise	3.2 hours
3,000 litres	5°C rise	2.4 hours
3,000 litres	10°C rise	4.8 hours
4,000 litres	5°C rise	3.2 hours
4,000 litres	10°C rise	6.4 hours

*Calculated using: Time (hours) = (Volume in m³ × Temperature Rise in °C × 1.16) ÷ 16 kW
Actual times may vary based on ambient temperature, water circulation, cover usage, and environmental conditions.

Running Cost Comparison

Based on average UK electricity costs of £0.25 per kWh:

Heating Method	Typical COP	Cost per kWh of Heat
IPT16BLY Heat Pump	10.3	£0.024
Standard Heat Pump	5.0	£0.050
Electric Heater	1.0	£0.250
Gas Boiler	0.85	£0.070

Annual Savings Example:
Commercial hot tub using 50 kWh heating per day:

• Electric heater: £4,563/year
• IPT16BLY: £438/year
• Savings: £4,125 annually 💷

📋 Complete Technical Specifications

Performance Specifications

Specification	Value
Model	IPT16BLY
Type	Side Outlet Inverter Heat Pump
Power Rating	16 kW
Phase	3-Phase (400V 50Hz)
Heating Capacity (27°C air/27°C water)	21.0 kW
Heating Capacity (15°C air/26°C water)	14.5 kW
Cooling Capacity (35°C air/28°C water)	9.5 kW
COP Range (27°C conditions)	14.8 – 6.4
Average COP at 50% Speed (27°C)	10.3
COP Range (15°C conditions)	7.1 – 4.6
Average COP at 50% Speed (15°C)	6.3

Operating Parameters

Parameter	Specification
Operating Air Temperature Range	-10°C to +43°C
Water Heating Range	18°C to 40°C
Water Cooling Range	12°C to 30°C
Refrigerant Type	R32 (GWP 675)
Refrigerant Charge	1,200g (1.2kg)
Minimum Installation Area Required	12.3 m²

Electrical Specifications

Specification	Value
Power Supply	400V 3-Phase 50Hz
Rated Input Power	0.41-3.15 kW
Rated Input Current	0.59-4.56 A
Maximum Input Current	5.8 A
Rated RCD	Type B 30mA
Rated Fuse/MCB	Type C 10A
Voltage Range (Min-Max)	360V – 440V
Frequency Range	47.5Hz – 52.5Hz

Water Circuit Specifications

Specification	Value
Recommended Water Flow Rate	8.0-10.0 m³/h
Water Connections	1½” or 50mm Female
Pressure Drop	0.61m / 6.0 kPa
Heat Exchanger	High-Efficiency Twisted Titanium

Acoustic Performance

Measurement Point	Boost Mode	Whisper Mode
Sound Level @ 10m	33.7 dB(A)	20.4 dB(A)
Sound Level @ 1m	53.7 dB(A)	40.4 dB(A)
Noise Reduction vs Traditional	Standard	-9 to -11 dB(A)

Physical Dimensions & Weight

Specification	Value
Dimensions (W × D × H)	954mm × 429mm × 755mm
Net Weight	68 kg
Packed Dimensions	1040mm × 445mm × 655mm
Construction Material	Aluminium Alloy
Colour	Professional Grey

🛡️ Industry-Leading 5-Year Warranty

Comprehensive Coverage for Peace of Mind

✅ 5-Year Manufacturer’s Warranty
✅ On-Site Parts & Labour – No return-to-base hassles
✅ Coverage includes:

• Compressor
• Heat exchanger
• Fan motor
• Electronic controls
• Refrigeration system
• All factory-fitted components

Warranty Terms:

• Requires professional installation by qualified engineer
• Annual service recommended (not mandatory)
• Proper water chemistry maintenance required
• Full winterization if not used year-round
• Valid throughout UK and Ireland

🔧 Installation Requirements & Clearances

Minimum Clearance Distances

For Safe & Efficient Operation:

Position	Minimum Distance
Front (Air Inlet)	700mm
Top (Air Outlet)	2,500mm
Sides	500mm
Rear	700mm
From Pool/Spa Edge	3,500mm (electrical safety regulations)

Installation Checklist

✅ Solid concrete base or corrosion-proof brackets
✅ Level mounting surface (within 2° of horizontal)
✅ Free airflow – No recirculation of expelled air
✅ Access to 400V 3-phase supply
✅ RCD protection – Type B 30mA required
✅ Isolator within 2m – In line of sight of unit
✅ Water flow 8-10 m³/h – Via filtration pump
✅ Bypass valve installation – For flow rate control
✅ Condensate drain – To waste or soakaway
✅ Minimum area 12.3m² (R32 refrigerant safety requirement)

Professional Installation Required

⚠️ This unit MUST be installed by:

• Qualified electrician (3-phase wiring)
• F-Gas certified engineer (R32 refrigerant system)
• Experienced pool/spa heating technician

🌡️ All-Season Capability – Designed for UK Climate

True Year-Round Performance

Winter Operation (-10°C to +5°C):

• Continues heating efficiently down to -10°C
• R32 refrigerant optimized for cold weather
• Automatic defrost cycle prevents ice buildup
• Forced defrost function available if needed

Spring/Autumn (5°C to 15°C):

• Optimal efficiency range
• Minimal defrost cycles
• Consistent performance

Summer (15°C to 30°C):

• Maximum efficiency achieved
• Cooling mode available if needed
• Prevents overheating on hot days

Extended Season (30°C+):

• Cooling capability up to 43°C ambient
• Protects against thermal overload
• Maintains comfortable water temperature

Built-In Protection Systems

🛡️ Comprehensive Safety Features:

• High/low pressure protection
• Anti-freeze protection
• Thermal overload protection
• Flow switch protection (no water flow detection)
• Voltage range protection (360-440V)
• Current limit protection
• Compressor start delay protection
• Auto-restart after power failure

❓ Frequently Asked Questions

Product Suitability & Selection

Q: Is this heat pump suitable for my commercial hot tub?
A: The IPT16BLY is ideal for commercial hot tubs between 3,000-8,000 litres with moderate to heavy usage. It’s perfect for hotels, spas, gyms, and wellness centers. The 3-phase power requirement makes it suitable for commercial premises with existing 3-phase electrical infrastructure.

Q: What size hot tub or swim spa can this heat?
A: The 16kW output is suitable for:

• Hot tubs: 3,000-6,000 litres (standard commercial size)
• Swim spas: 6,000-10,000 litres (with good insulation and cover)
• Small pools: Up to 20-25 m² surface area (seasonal use) The actual performance depends on desired temperature, ambient conditions, insulation quality, and usage patterns.

Q: Can this heat my pool in winter?
A: Yes! Unlike “extended season” models, the I-PAC+ range operates down to -10°C air temperature. However, for year-round pool heating in winter, you should consider:

• Using an insulated cover when not in use (essential)
• Realistic temperature expectations (28-30°C in mild winter, lower in severe cold)
• Possibly combining with supplementary heating for extreme cold periods
• Higher running costs in winter due to lower efficiency

Installation & Requirements

Q: Do I need 3-phase power for this unit?
A: Yes, this model (IPT16BLY) requires 400V 3-phase power. Most commercial premises have 3-phase supply, but domestic properties typically don’t. If you need a single-phase option, consider the IPT16ALY model (similar performance, 230V single-phase).

Q: What electrical work is required?
A: Installation requires:

• Dedicated 400V 3-phase supply
• Type C 10A MCB or aM fuse rated protection
• Type B 30mA RCD
• Isolator switch within 2m (line of sight)
• Professional installation by qualified electrician
• Compliance with IEE regulations and local codes

Q: Can I install this myself?
A: No. Professional installation is mandatory and required for warranty validity. Installation must be by:

• Qualified electrician (for 3-phase electrical work)
• F-Gas certified engineer (for R32 refrigerant system)
• Experienced pool/spa heating specialist Improper installation can be dangerous and will void the 5-year warranty.

Operation & Performance

Q: How much does it cost to run?
A: Running costs depend on:

• Ambient temperature
• Desired water temperature
• Usage patterns and hours of operation
• Insulation and cover usage

Example: Maintaining a 4,000L hot tub at 38°C in autumn (15°C ambient):

• Heat loss: Approx 3-4 kWh per hour (with cover)
• Heat pump input: 0.3-0.4 kWh per hour (COP ~10)
• Daily cost: £1.80-£2.40 @ £0.25/kWh
• Monthly cost: £54-£72

Compare to electric heater: £300-£360/month – Savings: £246-£288 monthly!

Q: How quiet is Whisper Mode really?
A: At 10 meters distance, Whisper Mode produces just 20.4 dB(A) – quieter than:

• Rustling leaves (20 dB)
• Quiet library (30 dB)
• Whispered conversation (30 dB)

At 1 meter: 40.4 dB(A) – similar to a quiet refrigerator. In Boost Mode, sound levels increase to 33.7 dB(A) at 10m and 53.7 dB(A) at 1m – still considerably quieter than traditional heat pumps (typically 45-60 dB(A) at 10m).

Q: How does inverter technology save money?
A: Traditional heat pumps run at 100% or 0% (on/off cycling). The IPT16BLY modulates between 20-100% to match exact heating needs. Benefits:

• 50-70% time at partial load = Lower average power consumption
• Eliminates inrush currents = Reduced electrical stress and costs
• Maintains stable temperature = Less overshoot and wasted energy
• Average COP 10.3 vs ~5.0 traditional = Over 2× more efficient Result: Typically 40-60% lower running costs compared to non-inverter models.

Maintenance & Longevity

Q: What maintenance is required?
A: Regular maintenance ensures optimal performance and longevity:

Monthly:

• Check water flow and pressure
• Clean finned evaporator surfaces (gently brush)
• Verify no obstructions blocking airflow
• Check condensate drainage

Annually:

• Professional service recommended
• Check refrigerant levels (F-Gas engineer only)
• Inspect electrical connections
• Clean heat exchanger (if needed)
• Test safety systems
• Verify optimal water chemistry

Winter (if not in use):

• Complete winterization procedure
• Drain heat exchanger fully
• Moisture repellent spray on electronics
• Ventilated cover for protection

Q: How long will it last?
A: With proper maintenance, expect:

• Compressor lifespan: 10-15 years
• Overall unit life: 15-20+ years
• Heat exchanger: 20+ years (titanium construction)

Inverter technology extends lifespan by reducing start/stop cycles. Commercial units typically achieve 12-15 years of trouble-free operation with annual servicing.

Q: What water chemistry is required?
A: The titanium heat exchanger is highly resistant to corrosion, but maintain these ranges for warranty coverage:

Parameter	Acceptable Range
pH	7.2 – 7.8
Total Alkalinity	80 – 120 ppm
Total Hardness	150 – 250 ppm
Free Chlorine	1 – 6 ppm (1-2 domestic, 3-6 commercial)
Total Dissolved Solids	<1,000 ppm
Salt Content	<35,000 ppm
Copper Content	<1 ppm

Compatible with chlorine, bromine, ozone, and Baquacil systems.

Technical & Compatibility

Q: Can I use this with my existing equipment?
A: Yes, the IPT16BLY integrates with standard pool/spa equipment:

• Filtration pumps: Compatible with most (requires 8-10 m³/h flow)
• Sanitizers: Works with chlorine, bromine, ozone, UV, salt systems
• Controllers: Built-in digital controller + optional Wi-Fi app
• Pool pump synchronization: P1/P2 terminals for time clock override

Water connections: 1½” or 50mm female – industry standard fittings.

Q: Does it work with smart home systems?
A: The built-in Wi-Fi connects to the dedicated smartphone app (iOS/Android). Currently, it does not integrate with Alexa, Google Home, or other smart home platforms. Control is via the Dantherm app or optional remote control panel.

Q: What’s included in the box?
A: Standard accessories:

• Heat pump unit
• Water union connectors (2 × 1½” and 2 × 50mm)
• Rubber mounting feet (set of 4)
• Condensate drainage kit
• User manual
• Installation manual

Optional extras (sold separately):

• Remote control panel kit with 10m cable
• Winter protection cover
• Additional water fittings

Warranty & Support

Q: What does the 5-year warranty cover?
A: Comprehensive coverage includes:

• All mechanical components
• Compressor and refrigeration system
• Heat exchanger
• Electronic controls and boards
• Fan motor
• On-site parts and labour

Exclusions:

• Damage from improper installation
• Incorrect water chemistry
• Frost damage (if not winterized)
• Electrical supply issues
• Physical damage or abuse

Q: Is this product F-Gas compliant?
A: Yes, fully compliant. The R32 refrigerant meets all 2025 F-Gas phase-down requirements. Installation, servicing, and disposal must be performed by F-Gas registered engineers. The unit requires a minimum installation area of 12.3m² (R32 safety classification A2L).

🎖️ Why Buy the IPT16BLY from Parts4Tubs?

✅ Authorized Dantherm Dealer – Genuine products, full manufacturer warranty
✅ Expert Advice – Specialist knowledge in commercial spa heating
✅ Competitive Pricing – Professional-grade equipment at great value
✅ Fast Delivery – Quick dispatch on in-stock items
✅ Technical Support – Help with product selection and installation queries
✅ Complete Range – Full selection of accessories and optional extras
✅ Trusted Supplier – Serving commercial and residential customers across the UK

🚀 Ready to Experience Professional-Grade Heating?

Transform your commercial hot tub or luxury spa with the IPT16BLY I-PAC+ 16

💡 Perfect for commercial operators who demand reliability, efficiency, and quiet operation
💡 Ideal for high-end residential installations requiring year-round performance
💡 Future-proof technology with eco-friendly R32 refrigerant and inverter efficiency
💡 Premium construction built to withstand demanding commercial environments
💡 Backed by 5-year warranty for complete peace of mind

Take the Next Step:

• Contact us for a personalized quote
• Speak to our technical team about your specific requirements
• Ask about professional installation services
• Enquire about financing options for commercial purchases

Investment in Comfort, Efficiency, and Guest Satisfaction

The IPT16BLY I-PAC+ 16 isn’t just a heat pump – it’s a long-term investment in your business or luxury lifestyle. With exceptional efficiency, whisper-quiet operation, and bulletproof reliability, this commercial-grade system delivers year after year of trouble-free performance.