Vian Power NEXUS 5 Heat Pump

🌊 Vian Power NEXUS 5 Heat Pump – Ultra-Efficient Inverter Spa & Swim Spa Heating System

Transform your spa or swim spa heating with the revolutionary NEXUS 5 – delivering market-leading efficiency with a COP of up to 13, saving you up to 70% on energy bills while maintaining perfect water temperature year-round.

Imagine stepping into perfectly heated spa water every single day, knowing you’re using a fraction of the energy – and spending a fraction of the money – compared to traditional electric heaters. The Vian Power NEXUS 5 makes this a reality.

Engineered specifically for UK climates and designed for spa enthusiasts who demand reliability without compromise, the NEXUS 5 combines cutting-edge full inverter EEV technology with intelligent temperature control to deliver consistent, energy-efficient heating that adapts to your needs.

💡 The Smart Choice for Your Spa

Traditional electric heaters have a Coefficient of Performance (COP) of just 1 – meaning every 1kW of electricity consumed produces only 1kW of heat. The NEXUS 5 achieves a COP of up to 13, producing 13kW of heat for every 1kW of electricity consumed. This isn’t just efficiency – it’s a complete transformation in how you heat your spa.

✅ Top 7 Standout Features & Benefits

1. 🔥 Market-Leading Efficiency (COP Up to 13)

What it means for you: Slash your heating bills by up to 70% compared to traditional electric heaters. For every £1 you spend on electricity, you get £13 worth of heating power. Over a year, this translates to hundreds of pounds in savings.

2. ❄️ All-Weather Performance Down to -10°C

What it means for you: Enjoy your spa year-round, even during harsh British winters. The innovative WarmCore heated base tray prevents ice formation and maintains consistent performance even when temperatures plummet, so you never have to worry about your heater failing when you need it most.

3. 📐 Ultra-Compact Design (460 × 399 × 429mm)

What it means for you: Fits seamlessly beside most spas without dominating your outdoor space. The discreet footprint means more room for relaxation and less visual clutter in your garden or patio area.

4. ⚙️ Full Inverter EEV Technology

What it means for you: Precise, smooth temperature control that adapts in real-time to conditions. No temperature fluctuations, no wasted energy from cycling on and off – just steady, reliable heating that maintains your perfect temperature automatically.

5. 🔌 Gecko & Balboa Control System Compatible

What it means for you: Seamlessly integrates with your existing spa control systems via the optional HP-AC006 cable. Control your heating alongside all your other spa functions from one central interface.

6. 🔇 Whisper-Quiet Operation

What it means for you: Balanced acoustic design with anti-vibration feet ensures your spa environment remains peaceful. No disruptive noise – just the soothing sound of water and complete relaxation.

7. 🌿 Eco-Friendly R32 Refrigerant

What it means for you: Heat your spa responsibly with a refrigerant that has low global warming potential. Enjoy guilt-free relaxation knowing you’re making an environmentally conscious choice.

📄 Downloads & Documentation

📥 Essential Product Documentation

📄 NEXUS 5 Complete User Manual (opens in new tab) Comprehensive installation guide, technical specifications, operational procedures, maintenance schedules, troubleshooting tips, and warranty information. Essential reading before installation and for ongoing maintenance.

Download this manual before installation to ensure proper setup and optimal performance. Keep it handy for reference throughout the life of your heat pump.

📊 Complete Technical Specifications

Specification	Details
Model	Vian Power NEXUS 5
Heating Technology	Full Inverter with EEV (Electronic Expansion Valve) Control
Maximum COP (Efficiency)	Up to 13 (under optimal conditions at ~25°C ambient)
Typical COP Range	6-13 depending on ambient temperature
Heating Capacity	Variable output 2.1kW – 5.1kW
Power Consumption	0.17kW – 0.90kW (variable based on demand)
Refrigerant Type	R32 (Low GWP – environmentally friendly)
Operating Temperature Range	-10°C to +43°C ambient air temperature
Water Temperature Range	Maintains 15°C to 40°C
Cold Climate Protection	WarmCore heated base tray prevents ice formation
Dimensions (L × W × H)	460mm × 399mm × 429mm
Weight	Approximately 23.5kg
Noise Level	32-45 dB(A) at 1m distance (library-quiet to conversational)
Power Supply	220-240V, 50Hz, Single Phase
Heat Exchanger Material	Titanium (corrosion-resistant, long-lasting)
Control Compatibility	Gecko in.grid, Balboa relay systems (via optional HP-AC006 cable)
Installation Clearances	Minimum 450mm inlet space, 1500mm fan outlet clearance
Dual Functionality	Heating and cooling modes supported
Warranty	5 Years Compressor & Heat Exchanger / 2 Years All Other Components (typical)

🏊 Spa Sizing Guide – Is the NEXUS 5 Right for You?

The NEXUS 5 is ideally suited for:

✅ Standard Hot Tubs: 1,200 – 1,800 litres (260 – 400 gallons) ✅ Compact Swim Spas: Up to 2,000 litres (440 gallons) ✅ Spa-Side Plunge Pools: Small to medium volume applications ✅ Year-Round Users: Those heating spas in moderate UK climates ✅ Energy-Conscious Owners: Anyone looking to dramatically reduce heating costs

⚠️ Not Recommended For:

❌ Large swim spas over 2,500 litres ❌ Extreme climate locations regularly below -15°C (consider NEXUS 6 or 7 EVI) ❌ Commercial high-turnover applications requiring rapid heat-up

⏱️ Estimated Heat-Up Times & Performance Data

Understanding Your Heating Times

The tables below provide estimated heat-up times for various spa volumes and temperature rises. These are calculated using the NEXUS 5’s average output of 3.6kW and standard thermodynamic formulas.

📈 Heat-Up Time Estimates by Spa Size

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

Spa Volume	Temperature Rise: 10°C	Temperature Rise: 15°C	Temperature Rise: 20°C
1,200L (Small Hot Tub)	3.9 hours	5.8 hours	7.7 hours
1,500L (Medium Hot Tub)	4.8 hours	7.3 hours	9.7 hours
1,800L (Large Hot Tub)	5.8 hours	8.7 hours	11.6 hours
2,000L (Swim Spa)	6.4 hours	9.7 hours	12.9 hours

🌡️ Heat-Up Performance at Different Starting Temperatures

Scenario: 1,500L Hot Tub (Typical Size)

Starting Temp	Target Temp	Temperature Rise	Estimated Time
10°C	38°C	28°C	13.6 hours
15°C	38°C	23°C	11.2 hours
20°C	38°C	18°C	8.7 hours
25°C	38°C	13°C	6.3 hours
30°C	38°C	8°C	3.9 hours

📌 Important Notes About Heat-Up Times:

• These are estimates based on ideal conditions with good insulation and a quality cover
• Actual times may vary based on: ambient temperature, wind conditions, spa insulation quality, cover type, and heat loss during heating
• In colder weather (below 5°C), expect times to increase by 20-40%
• Using a premium insulated cover reduces heat-up time significantly
• Once heated, the NEXUS 5 maintains temperature far more efficiently than heating from cold

💰 Running Cost Comparison – See the Savings

Typical 1,500L Hot Tub Maintained at 38°C

Based on average UK electricity rate of £0.24 per kWh (2025):

Heating Method	Daily kWh Used	Daily Cost	Monthly Cost	Annual Cost
Traditional 3kW Electric Heater (COP 1)	12-15 kWh	£2.88 – £3.60	£86 – £108	£1,051 – £1,314
NEXUS 5 Heat Pump (Average COP 8)	1.5-2.5 kWh	£0.36 – £0.60	£11 – £18	£131 – £219
💵 ANNUAL SAVINGS	–	–	£75 – £90	£832 – £1,095

🎯 Over 5 Years, you could save £4,160 – £5,475 on heating costs alone!

Calculations based on moderate UK climate, good insulation, and typical usage patterns. Your actual savings will vary based on climate, usage, and electricity rates.

🔧 Installation & Placement Requirements

Space Requirements

• Minimum inlet clearance: 450mm (17.7 inches)
• Minimum outlet clearance: 1,500mm (59 inches) for optimal airflow
• Side clearance: 300mm (12 inches) recommended for servicing

Ideal Placement

✅ Within 1-3 meters of spa for efficient heat transfer ✅ On a firm, level surface (concrete pad or paving slabs) ✅ Away from bedroom windows to minimize noise impact ✅ Protected from prevailing winds where possible ✅ Good air circulation – not boxed in or enclosed

Power Connection

⚡ No separate electrical installation required – powers directly from your spa pack ✅ Simply connect via your existing spa electrical system ✅ Optional HP-AC006 cable for Gecko/Balboa integration

Plumbing Integration

🔧 Integrates into your spa’s circulation system 🔧 Typically installed after the circulation pump, before the heater 🔧 Professional installation recommended for optimal performance

❓ Frequently Asked Questions

1. How much will the NEXUS 5 really save me on heating costs?

Most users report savings of 60-70% compared to traditional electric heating. For a typical 1,500L hot tub maintained year-round, this translates to £800-£1,000+ in annual savings. The exact amount depends on your climate, usage patterns, and electricity rates, but the savings are substantial and immediate.

2. Will it work in British winters when temperatures drop below freezing?

Absolutely! The NEXUS 5 is specifically designed for UK climates and operates reliably down to -10°C thanks to the innovative WarmCore heated base tray. This prevents ice formation and maintains efficiency even during harsh winter conditions. For extremely cold climates (regularly below -15°C), consider upgrading to the NEXUS 6 or NEXUS 7 EVI.

3. How long does it take to heat my spa from cold?

For a typical 1,500L hot tub, expect 8-10 hours to heat from 15°C to 38°C under moderate conditions. However, here’s the key: once your spa is at temperature, the NEXUS 5 maintains it using minimal energy. Most users run their spa continuously at their desired temperature, so cold start times become irrelevant after the initial heat-up.

4. Is it really quiet enough for residential use?

Yes! Operating at just 32-45 dB(A) at one meter, the NEXUS 5 is quieter than a normal conversation. The balanced acoustic design with anti-vibration feet ensures peaceful operation. Many users report it’s quieter than their spa’s circulation pump.

5. Can I install it myself or do I need a professional?

While the NEXUS 5 is designed for straightforward integration, professional installation is strongly recommended. This ensures optimal placement, proper plumbing connections, correct electrical hookup, and warranty compliance. Most installations take 2-4 hours for an experienced technician.

6. What maintenance does it require?

Minimal! Regular maintenance includes:

• Monthly: Visual inspection, clean exterior fan housing from debris
• Quarterly: Check water flow and connections
• Annually: Professional service check of refrigerant levels and electrical connections

The titanium heat exchanger is highly corrosion-resistant, and the inverter technology has fewer moving parts than traditional systems, meaning less can go wrong.

7. Will it work with my existing spa control system?

The NEXUS 5 is compatible with Gecko in.grid and Balboa relay control systems via the optional HP-AC006 cable. This allows you to control your heat pump directly from your spa’s main control panel. For other systems, the heat pump can operate independently with its own controls.

8. What’s the difference between the NEXUS 5, NEXUS 6, and NEXUS 7?

• NEXUS 5: Best for moderate climates (-10°C), COP up to 13, ideal for standard hot tubs
• NEXUS 6: Enhanced cold-climate performance (-20°C), COP up to 12.5, heated bands, larger capacity
• NEXUS 7 EVI: Extreme climate specialist (-25°C), COP up to 14.2, EVI technology, maximum heating capacity

Choose based on your climate and spa size. For most UK users, the NEXUS 5 provides excellent performance and value.

9. What happens if the heat pump fails during winter?

The beauty of the NEXUS 5 is its reliability, but if service is ever needed, your spa’s built-in electric heater can serve as backup (if not disconnected). The 5-year warranty on compressor and heat exchanger provides peace of mind. Most issues are quickly resolved with phone support or a technician visit.

10. Does it provide cooling in summer too?

Yes! The NEXUS 5 supports both heating and cooling modes, making it perfect for swim spas or outdoor pools where you might want to cool the water during hot summer months. This dual functionality maximizes your investment year-round.

11. How does the COP vary with temperature?

COP (Coefficient of Performance) is highest in warmer conditions and decreases as ambient temperature drops:

• At 25°C ambient: COP up to 13 (peak efficiency)
• At 15°C ambient: COP typically 8-10
• At 5°C ambient: COP typically 6-8
• At -5°C ambient: COP typically 4-6

Even at lower COPs, the NEXUS 5 remains far more efficient than traditional electric heating (which always has a COP of 1).

12. Will I need to upgrade my electrical supply?

Typically, no! The NEXUS 5 powers directly from your existing spa electrical system. Maximum power draw is under 1kW, which is significantly less than most spa electric heaters (2-3kW). Always consult with your installer to verify your specific setup.

🎯 Who Is This Heat Pump Perfect For?

✅ Ideal Users:

• Year-Round Spa Enthusiasts who want consistent heating without breaking the bank
• Energy-Conscious Homeowners looking to reduce carbon footprint and utility bills
• British Climate Residents needing reliable performance through unpredictable weather
• Upgrade Seekers replacing inefficient electric heaters with modern technology
• New Spa Owners making smart choices from day one
• Garden & Outdoor Living Enthusiasts who value discreet, attractive equipment

💡 Perfect Applications:

• Residential hot tubs and spas
• Compact swim spas
• Plunge pools
• Spa-side therapeutic pools
• Holiday cottage/Airbnb spas (with appropriate controls)

🌟 Real-World Performance Expectations

What You Can Expect in Practice:

Spring & Autumn (10-15°C Ambient):

⚡ COP: 8-11 💰 Typical daily running cost: £0.40-£0.70 ⏱️ Heat maintenance: Excellent with minimal cycling

Summer (20-25°C Ambient):

⚡ COP: 11-13 (peak efficiency!) 💰 Typical daily running cost: £0.25-£0.45 ⏱️ Heat maintenance: Outstanding; may switch to cooling mode

Winter (0-5°C Ambient):

⚡ COP: 5-8 💰 Typical daily running cost: £0.80-£1.20 ⏱️ Heat maintenance: Very good; may run more frequently

Deep Winter (-5 to -10°C Ambient):

⚡ COP: 4-6 💰 Typical daily running cost: £1.00-£1.50 ⏱️ Heat maintenance: Good; WarmCore system prevents freezing

Even in the coldest conditions, the NEXUS 5 remains 4-6 times more efficient than traditional electric heating!

🛡️ Warranty & Quality Assurance

Your Investment Protected:

• ✅ 5 Year Warranty on Compressor & Titanium Heat Exchanger
• ✅ 2 Year Warranty on All Other Components
• ✅ CE Certified for European safety standards
• ✅ R32 Refrigerant – environmentally responsible choice
• ✅ Proven Technology – from the trusted Vian Power range
• ✅ UK Support available for installation and servicing queries

📦 What’s Included in the Box

Your NEXUS 5 package includes:

• ✅ NEXUS 5 Heat Pump Unit (fully assembled)
• ✅ Anti-vibration mounting feet
• ✅ Connection fittings and hose adapters
• ✅ User manual and installation guide
• ✅ Warranty documentation

Optional Accessories Available:

• 🔌 HP-AC006 Control Cable (for Gecko in.grid or Balboa integration)
• 🔧 Professional installation service
• 📱 WiFi control module (check availability)

🚀 Make the Switch Today – Start Saving Tomorrow

The Vian Power NEXUS 5 isn’t just a heat pump – it’s an investment in comfort, efficiency, and environmental responsibility. With market-leading COP performance, whisper-quiet operation, and proven reliability in British climates, it’s the smart choice for spa owners who refuse to compromise.

Why wait? Every day with traditional electric heating is money literally evaporating into the air. The NEXUS 5 typically pays for itself within 2-3 years through energy savings alone – then continues delivering value for many more years to come.

Ready to Transform Your Spa Heating?

👉 Order now to secure your NEXUS 5 and start your journey to smarter, more economical spa heating.

💬 Questions? Contact our expert team for personalized advice on sizing, installation, and getting the most from your heat pump.

📧 Email us for technical specifications, compatibility checks, or to arrange a free site survey.

🔍 Technical Notes & Disclaimers

Performance Disclaimers:

• All heat-up time calculations are estimates based on ideal conditions including good insulation, quality spa covers, minimal wind exposure, and moderate ambient temperatures.
• Actual performance will vary based on factors including: ambient air temperature, humidity, spa insulation quality, cover type and condition, wind exposure, water volume accuracy, starting water temperature, and altitude.
• COP values are manufacturer-tested under laboratory conditions. Real-world COP will vary with ambient conditions.
• Running cost estimates based on average UK electricity rates (£0.24/kWh as of 2025) and may vary significantly by region and supplier.

Installation Requirements:

• Professional installation strongly recommended to ensure warranty compliance and optimal performance.
• Electrical work must be completed by qualified electrician in accordance with local building regulations and BS 7671 wiring regulations.
• Adequate drainage and weather protection recommended for long-term reliability.
• Always follow manufacturer’s installation guidelines in the user manual.

Environmental Considerations:

• R32 refrigerant is low GWP but must be handled by qualified technicians.
• Unit should be installed with environmental regulations and noise ordinances in mind.
• Proper recycling/disposal required at end of life – contact qualified HVAC professionals.

🌊 Join thousands of satisfied spa owners who’ve made the smart switch to efficient, reliable heat pump heating with the Vian Power NEXUS 5. Your perfect spa temperature awaits – every day, all year round! 🌊