Ultra-Efficient Heating for Hot Tubs, Swim Spas & Pools in Cold Climates

The Vian Power NEXUS EVO 6 is a professional-grade inverter heat pump engineered to deliver exceptional heating performance even in the harshest winter conditions. With an industry-leading Coefficient of Performance (COP) of up to 12.5, this heat pump produces 12.5 units of heat for every 1 unit of electricity consumed—making it up to 75% more energy-efficient than traditional electric heaters.

Featuring advanced Electronic Expansion Valve (EEV) technology, WarmCore anti-freeze protection, and compatibility with leading spa control systems, the NEXUS EVO 6 is the intelligent choice for spa owners seeking reliable, cost-effective heating that works year-round.

🔥 Why Choose the NEXUS EVO 6?

✅ Extreme Cold Weather Operation Operates reliably down to -20°C ambient temperature thanks to integrated WarmCore heating bands that prevent ice build-up on the compressor and base tray. No more shutting down your spa in winter!

✅ Outstanding Energy Efficiency With a peak COP of 12.5, you’ll save up to 70% on running costs compared to standard electric heaters. Lower bills, reduced carbon footprint, superior performance.

✅ Precision Inverter Technology Full DC inverter compressor with Electronic Expansion Valve (EEV) provides smooth power modulation, rapid temperature recovery, and whisper-quiet operation at under 50dB(A).

✅ Hybrid Logic System Features optional 3kW direct electric heater control—perfect for holiday lets and commercial spas requiring rapid heat-up for quick client turnaround.

✅ Universal Control Compatibility Works with Gecko in.grid and Balboa relay systems via optional communication cable (HP-AC006). Integrates seamlessly with your existing spa control setup.

✅ Compact & Space-Saving Design Low-profile footprint (626mm W × 442mm H × 467mm D) allows close installation to your spa, reducing pipe runs and heat loss.

✅ Smart WiFi Control Built-in WiFi connectivity with Smart Life app—monitor and adjust your heat pump remotely from anywhere via smartphone.

📋 Complete Technical Specifications

Performance Data

Parameter	NEXUS EVO 6
Technology Type	Non-EVI Full Inverter with EEV
Coefficient of Performance (COP)	Up to 12.5 (at optimal conditions)
Minimum Operating Temperature	-20°C ambient
Maximum Operating Temperature	+43°C ambient
Heating Water Temperature Range	15°C to 40°C
Cooling Water Temperature Range	8°C to 35°C
Refrigerant Type	R32 (Low GWP – Eco-Friendly)
Compressor Brand	Mitsubishi Rotary Inverter
Heat Exchanger	Titanium (Corrosion-Resistant)

Heating Performance (Swimming Pool Mode)

Ambient: 26°C, Humidity: 80%, Water Inlet/Outlet: 26°C/28°C

Metric	Range
Heating Capacity	2.75 – 7.25 kW
Power Input	0.22 – 1.22 kW
COP	5.94 – 12.50

Heating Performance (Spa Mode)

Ambient: 15°C, Humidity: 70%, Water Outlet: 38°C

Metric	Range
Heating Capacity	2.02 – 5.24 kW
Power Input	0.28 – 1.13 kW
COP	4.64 – 7.21

Extreme Cold Performance (Spa Mode)

Ambient: 0°C, Humidity: 70%, Water Outlet: 38°C

Metric	Range
Heating Capacity	1.36 – 3.02 kW
Power Input	0.34 – 1.24 kW
COP	2.43 – 4.00

Sub-Zero Performance (Spa Mode)

Ambient: -10°C, Humidity: 70%, Water Outlet: 38°C

Metric	Range
Heating Capacity	0.95 – 2.51 kW
Power Input	0.31 – 1.28 kW
COP	1.96 – 3.10

Cooling Performance (Pool Mode)

Ambient: 35°C, Humidity: 40%, Water Inlet/Outlet: 27°C

Metric	Range
Cooling Capacity	1.50 – 3.14 kW
Power Input	0.30 – 1.08 kW
EER	2.9 – 5.0

Electrical Specifications

Parameter	Value
Power Supply	220-240V ~ 50Hz (Single Phase)
Rated Power Input	2.0 kW
Rated Current	9.0 A
Main Board Fuse	25A, 250V
Power Cable Required	3G 1.5mm² (Outdoor Rated)
Earth Class	Class I (Earthing Required)

Physical Specifications

Parameter	Value
Water Flow Rate	3.0 m³/h (3,000 litres/hour)
Water Connection	Φ48.3mm (Hard pipe required)
Water Pressure Drop	18 kPa
Sound Pressure Level @ 1m	<50 dB(A)
Sound Pressure Level @ 10m	<29 dB(A)
Net Weight	38 kg
IP Rating	IPX4 (Splash-proof)

Dimensions (with rubber pads installed)

Dimension	Measurement
Width	626 mm
Height	442 mm
Depth	467 mm

📄 Downloads & Documentation

User Manual & Installation Guide

📄 NEXUS EVO 6/7 Complete User Manual (opens in new tab)

Contents include:

• Complete installation instructions with diagrams
• Electrical wiring and connection guidance
• Plumbing integration layouts (pool, spa, and hybrid systems)
• WiFi setup and Smart Life app configuration
• Controller operation and programming
• Maintenance schedules and winterization procedures
• Full troubleshooting guide with fault codes
• Technical specifications and performance charts
• Safety warnings and compliance information

108-page comprehensive manual covering all aspects of installation, operation, and maintenance

🎯 Key Features & Benefits

❄️ WarmCore Anti-Freeze Technology

Integrated heating bands on the compressor body and tray base actively prevent ice formation during sub-zero operation. The system automatically activates when temperatures drop, ensuring continuous heating performance down to -20°C without freeze damage or shutdown.

⚡ Full DC Inverter with EEV Control

Unlike fixed-speed heat pumps, the NEXUS EVO 6 continuously adjusts compressor speed and refrigerant flow to match your exact heating demand. This results in:

• Faster heat-up times
• More stable water temperature (±0.5°C accuracy)
• Reduced energy consumption
• Extended compressor lifespan
• Quieter operation with minimal vibration

🔧 Hybrid Logic Electric Heater Integration

Built-in relay control for a 3kW direct electric heater (sold separately). Perfect for:

• Holiday Lets: Rapidly heat spa between guest bookings
• Commercial Operations: Quick turnaround for high-traffic spas
• Backup Heating: Automatic electric heater assist in extreme cold
• Boost Mode: Accelerated heating when needed

Electric heater terminals support up to 5A load. For higher current requirements, use external contactor.

🎛️ Universal Spa Control Compatibility

Option 1: Standalone Operation Use the supplied wired LCD controller for full independent operation. No integration needed—perfect for pools and simple spa installations.

Option 2: Balboa Communication (requires HP-AC006 cable – sold separately) Full two-way communication with Balboa control systems:

• BP6013G2 / BP6013G3
• BP2100G0 / BP2100G1
• BP214PBC
• Compatible displays: Spatouch 3, Spatouch 2, SpatouchMini, TP740, TP700

Select Heat Only / Cool Only / Heat & Cool / Disabled modes directly from your spa control panel.

Option 3: Gecko in.grid Integration (requires HP-AC006 cable – sold separately) Relay control integration with Gecko systems—heat pump responds to spa heating demands automatically.

Option 4: Linkage Switch Control Two-wire dry contact input allows external on/off control from timers, automation systems, or other switches.

📱 Smart WiFi Control & Monitoring

Built-in WiFi module connects to the Smart Life app (iOS/Android):

• Remote Control: Turn on/off, adjust temperature, switch modes
• Scheduling: Set multiple daily timers (3 programmable periods)
• Monitoring: View real-time water temperature, ambient temperature, system status
• Alerts: Receive fault notifications and diagnostics
• Multi-User: Share control with family or staff
• Energy Tracking: Monitor system parameters and performance

No hub required—connects directly to your 2.4GHz WiFi network

🔇 Ultra-Quiet Operation

Advanced fan design and anti-vibration mounting deliver near-silent operation:

• 50dB(A) at 1 meter (quieter than a normal conversation)
• 29dB(A) at 10 meters (barely audible)

Ideal for residential gardens, hotel installations, and noise-sensitive areas.

🌊 Titanium Heat Exchanger

Unlike copper or stainless steel, the titanium heat exchanger provides:

• Superior corrosion resistance in chlorinated or salt water
• Longer lifespan (20+ year design life)
• Minimal maintenance requirements
• Compatible with all sanitizers (chlorine, bromine, salt, ozone, UV)

🌍 Eco-Friendly R32 Refrigerant

R32 offers significant environmental advantages:

• 68% lower Global Warming Potential than R410A
• More efficient heat transfer (higher capacity per kg)
• Easier recycling and disposal
• Future-proof compliance with evolving refrigerant regulations

⏱️ Real-World Heat-Up Times

Estimated Time to Heat Various Water Volumes

From 15°C to 38°C (23°C temperature rise)

These are theoretical estimates using the formula: Time (hours) = (Volume in m³ × Temp Rise °C × 1.16) ÷ Heat Pump kW Rating

At 15°C Ambient Temperature (Typical Spring/Autumn)

Average heating capacity: 3.63 kW

Water Volume	Typical Application	Estimated Heat-Up Time
1,000 litres (1.0 m³)	Small Hot Tub (3-person)	7.3 hours
1,500 litres (1.5 m³)	Medium Hot Tub (4-5 person)	11 hours
2,000 litres (2.0 m³)	Large Hot Tub (6-person)	14.6 hours
2,500 litres (2.5 m³)	Swim Spa (Small)	18.3 hours
3,000 litres (3.0 m³)	Swim Spa (Medium)	22 hours

At 0°C Ambient Temperature (Winter)

Average heating capacity: 2.19 kW

Water Volume	Typical Application	Estimated Heat-Up Time
1,000 litres (1.0 m³)	Small Hot Tub (3-person)	12.1 hours
1,500 litres (1.5 m³)	Medium Hot Tub (4-5 person)	18.2 hours
2,000 litres (2.0 m³)	Large Hot Tub (6-person)	24.3 hours
2,500 litres (2.5 m³)	Swim Spa (Small)	30.3 hours
3,000 litres (3.0 m³)	Swim Spa (Medium)	36.4 hours

At 26°C Ambient Temperature (Summer)

Average heating capacity: 5.00 kW

Water Volume	Typical Application	Estimated Heat-Up Time
1,000 litres (1.0 m³)	Small Hot Tub (3-person)	5.3 hours
1,500 litres (1.5 m³)	Medium Hot Tub (4-5 person)	8 hours
2,000 litres (2.0 m³)	Large Hot Tub (6-person)	10.6 hours
2,500 litres (2.5 m³)	Swim Spa (Small)	13.3 hours
3,000 litres (3.0 m³)	Swim Spa (Medium)	16 hours

⚠️ Important Notes:

• These are theoretical estimates only—actual times vary based on:
  • Starting water temperature
  • Exact ambient temperature and humidity
  • Wind exposure and weather conditions
  • Spa insulation quality and cover effectiveness
  • Pipe insulation and run length
  • Heat loss during heating process
• For faster heat-up in cold weather, consider adding the optional 3kW electric heater
• Well-insulated spas with quality covers will heat significantly faster
• Always maintain proper water flow (3.0 m³/h) for optimal performance

💰 Running Cost Comparison

Annual Heating Cost Estimate

Based on maintaining a 1,600-litre hot tub at 38°C

Scenario: Outdoor installation, UK climate, no shelter, 10-month heating season

Heating Method	Annual kWh	Annual Cost*	Monthly Cost	Savings vs Electric
NEXUS EVO 6 Heat Pump	~750 kWh	£205	£20.50	70% cheaper
Standard 3kW Electric Heater	~2,500 kWh	£684	£68.40	Baseline

Based on 27.35p per kWh electricity rate (Oct 2023 Ofgem rate)

Real-World Test Data: In independent testing over 10 months (Dec 2022 – Sep 2023) with a similar Vian heat pump, actual consumption was 749.55 kWh—demonstrating real-world efficiency matches manufacturer claims.

Cost Per Day to Maintain Temperature

Season	Ambient Temp	Daily kWh	Daily Cost*
Summer	20-26°C	~1.5 kWh	£0.41
Spring/Autumn	10-15°C	~2.5 kWh	£0.68
Winter	0-5°C	~4.0 kWh	£1.09

Based on 27.35p per kWh

💡 Savings Tip: Using economy mode overnight (when spa isn’t in use) can reduce consumption by 30-40% with minimal impact on daytime usability.

🔌 Installation Requirements

Electrical Requirements

• Power Supply: 220-240V single-phase AC, 50Hz
• Circuit Protection: 16A Type D circuit breaker (minimum)
• RCD Protection: 30mA residual current device required
• Cable: 3-core 1.5mm² outdoor-rated cable (minimum)
• Earthing: Mandatory Class I earth connection
• Installation: Must be performed by qualified electrician per local regulations

Plumbing Requirements

• Water Flow Rate: 3.0 m³/h (50 litres/min) minimum
• Pipe Connection: 48.3mm (1½”) hard pipe—flexible hose not supported
• Maximum Pipe Run: ≤10 meters from spa to heat pump (shorter = better efficiency)
• Bypass Valve: Strongly recommended for maintenance and flow control
• Isolation Valves: Required on inlet and outlet for servicing
• Drain Valves: Install at lowest point for winterization
• Filter: Must be installed upstream of heat pump to prevent debris damage

⚠️ Critical: The water connections cannot support the weight of flexible hoses—hard pipe plumbing is mandatory to prevent damage to internal titanium heat exchanger.

Installation Location Requirements

Minimum Clearances:

• Front (air outlet): 2000mm clear space
• Rear (air inlet): 300mm from wall/obstruction
• Left Side: 300mm clearance
• Right Side: 300mm clearance
• Top: Keep clear—no objects on top of unit

Ideal Location Characteristics:

• ✅ Firm, level, stable base (21g/mm² minimum support)
• ✅ Well-ventilated outdoor area
• ✅ Away from bedroom windows (noise consideration)
• ✅ Not facing neighbor’s windows or living areas
• ✅ Protected from direct exposure to road spray/mud
• ✅ Accessible for maintenance and filter cleaning
• ✅ Condensate drainage available
• ✅ Within 10m of spa for optimal efficiency

Avoid Installing:

• ❌ In enclosed spaces without ventilation
• ❌ Near sources of flammable gases or corrosive chemicals
• ❌ In areas exposed to oil mist or sulfur compounds
• ❌ Where air recirculation could occur
• ❌ In high-traffic areas (child safety)
• ❌ Where falling objects or debris could damage unit

Mounting Options

Option 1: Install on supplied rubber pads (included)—suitable for most installations Option 2: Install on rubber blocks (included)—provides additional height clearance for condensate drainage

🛠️ What’s Included in the Box

Item	Quantity	Purpose
NEXUS EVO 6 Heat Pump	1	Main unit
Wired LCD Controller	1	Temperature control and programming
User Manual	1	Installation and operation guide
Rubber Mounting Pads	4	Vibration isolation
Drain Connectors	2	Condensate water drainage
Drain Pipes	2	Condensate discharge
Water Pipe Joints	2	48.3mm plumbing connections
Power Cable Splitter	1	For water pump power output
Power Cable Adapter	1	Alternative power connection
Wrench	1	Installation tool

Not Included (Available Separately):

• HP-AC006 Communication Cable (for Balboa/Gecko integration)
• Hard plumbing pipes and fittings
• Isolation and bypass valves
• Water pump (if not built into spa)
• Electric heater (optional, for Hybrid Logic functionality)

💡 Operation Modes Explained

🔥 Heating Mode

Standard operation for warming spa water. Compressor runs with 4-way valve directing hot refrigerant to titanium heat exchanger, transferring heat to water. Operates continuously until set temperature is reached, then cycles to maintain temperature.

Best for: Maintaining spa temperature, cold weather operation, year-round heating

❄️ Cooling Mode

Reverses refrigerant flow to extract heat from water. Ideal for summer plunge pools or keeping swim spas refreshingly cool.

Best for: Summer cooling, plunge pools, post-exercise recovery spas

🔄 Automatic Mode

Intelligently switches between heating and cooling based on current water temperature vs. set point. If water is below target, heats. If above target, cools.

Best for: Year-round operation, variable climate zones, minimal user intervention

🤫 Silent Mode

Reduces compressor and fan speed to minimize noise output. Sacrifices some heating capacity for quieter operation.

Best for: Evening use, noise-sensitive areas, sleeping hours

💪 Powerful Mode

Maximizes compressor speed and heating output for fastest possible heat-up.

Best for: Quick recovery, initial heat-up, extreme cold conditions

🧠 Smart Mode

Learns your usage patterns and optimizes heating schedule for energy efficiency while ensuring spa is ready when you want it.

Best for: Regular users with consistent schedules, maximum energy savings

🔒 Safety Features

• ✅ High Pressure Switch: Automatic shutdown if system pressure exceeds safe limits
• ✅ Low Pressure Switch: Protects against refrigerant loss or blockages
• ✅ Water Flow Switch: Prevents operation without adequate water flow (prevents freezing damage)
• ✅ Anti-Freeze Protection: Automatic activation when water temperature drops dangerously low
• ✅ Over-Temperature Protection: Shuts down if discharge temperature exceeds limits
• ✅ Over-Current Protection: CT sensor monitors compressor current draw
• ✅ IPM Temperature Protection: Inverter module thermal shutdown
• ✅ Phase Loss Detection: Protects against electrical supply faults
• ✅ Compressor Out-of-Step Detection: Prevents damaging operating conditions
• ✅ 3-Minute Delay Restart: Protects compressor after power interruption
• ✅ IPX4 Water Ingress Protection: Splash and spray resistant enclosure
• ✅ Earth Leakage Protection: Requires 30mA RCD in fixed wiring

❓ Frequently Asked Questions

What size hot tub or swim spa is the NEXUS EVO 6 suitable for?

The NEXUS EVO 6 is ideal for:

• Hot Tubs: 1,000 – 2,500 litres (3-6 person capacity)
• Swim Spas: Up to 3,500 litres (depending on insulation and climate)
• Small Plunge Pools: 3,000 – 4,000 litres

For larger volumes, consider the NEXUS EVO 7 EVI model with higher output capacity. The key factors are water volume, ambient temperature range, insulation quality, and how quickly you need heat recovery.

How much will it cost to run compared to my current electric heater?

On average, customers save 60-75% on heating costs compared to standard 3kW electric heaters. For a typical 1,600-litre hot tub maintained at 38°C year-round in the UK:

• Electric heater: ~£684/year (2,500 kWh)
• NEXUS EVO 6: ~£205/year (750 kWh)
• Annual savings: ~£479

The exact savings depend on your local electricity rates, climate, spa insulation, usage patterns, and cover quality. Warmer climates see even greater savings.

Can it really operate in freezing temperatures?

Yes! The NEXUS EVO 6 is specifically engineered for cold climates and operates reliably down to -20°C ambient temperature. The WarmCore system includes heating bands on the compressor body and tray base that automatically activate in sub-zero conditions, preventing ice formation and maintaining heating performance.

While heating capacity does reduce in extreme cold (physics limits apply to all heat pumps), the unit continues operating when competitor models shut down. At -10°C, it still delivers 1.73 kW average heating with a COP of 2.53—still twice as efficient as an electric heater.

Do I need to hire an electrician to install it?

Yes, we strongly recommend professional installation. While the heat pump can draw power from your spa pack, the installation must comply with local electrical codes, including:

• Proper circuit protection (Type D breaker)
• RCD protection (30mA)
• Correct cable sizing for load and distance
• Earth bonding verification

Additionally, plumbing requires hard pipe connections (flexible hoses not supported), bypass valve installation, and proper water flow setup. Professional installation ensures warranty validity, safety compliance, and optimal performance.

Will it work with my existing spa control system?

Most likely, yes! The NEXUS EVO 6 offers three integration options:

Option 1 – Standalone: Use the included wired controller—works with any spa, no integration needed

Option 2 – Balboa Communication: Full two-way control via optional HP-AC006 cable with compatible Balboa systems (BP6013G2/G3, BP2100G0/G1, BP214PBC)

Option 3 – Gecko Relay: Input relay control via optional HP-AC006 cable with Gecko in.grid systems

Option 4 – Generic Relay: Two-wire dry contact input works with any automation system

If you’re unsure about compatibility, contact us with your spa control system model for confirmation.

How loud is the heat pump?

Very quiet! At just 50dB(A) at 1 meter distance, it’s quieter than:

• Normal conversation (60dB)
• Dishwasher (55dB)
• Refrigerator running (50dB)

At 10 meters, it’s barely audible at 29dB(A). The DC inverter fan and anti-vibration mounts deliver near-silent operation. Silent Mode further reduces noise for evening use or noise-sensitive areas.

What maintenance does it require?

The NEXUS EVO 6 is remarkably low-maintenance:

Weekly/Monthly:

• Check and clean spa filter to maintain water flow
• Inspect for any unusual sounds or vibrations

Every 6 Months:

• Clean evaporator fins with soft brush or vacuum (remove dust/debris)
• Check condensate drainage is clear
• Verify electrical connections are secure

Annually (by qualified technician):

• Refrigerant pressure check
• Electrical safety inspection
• Component inspection
• Performance verification

Winterization: If shutting down for winter, follow manual procedures to drain all water from the unit to prevent freeze damage (not necessary if unit remains powered and operating).

The titanium heat exchanger requires minimal cleaning compared to copper/stainless alternatives and is compatible with all sanitizers.

Can I use it for cooling my pool in summer?

Yes! The NEXUS EVO 6 includes full cooling functionality, reversing the refrigerant cycle to extract heat from water. This is perfect for:

• Keeping swim spas refreshingly cool in summer
• Plunge pools for post-workout recovery
• Preventing excessive pool temperatures in hot weather

Cooling capacity ranges from 1.50-3.14 kW depending on conditions, with excellent efficiency (EER up to 5.0). Simply switch to Cooling Mode from the controller or app.

What’s the difference between the EVO 6 and EVO 7 EVI?

Feature	NEXUS EVO 6	NEXUS EVO 7 EVI
Technology	Full Inverter with EEV	EVI (Enhanced Vapor Injection) Inverter
Max COP	12.5	14.2 (higher efficiency)
Min Operating Temp	-20°C	-25°C (colder climate capability)
Heating Capacity (15°C ambient)	2.02-5.24 kW	2.00-5.33 kW
Heating Capacity (0°C ambient)	1.36-3.02 kW	1.54-3.91 kW (better cold performance)
Compressor	Mitsubishi Rotary	GMCC Rotary
Weight	38 kg	37 kg

Choose EVO 6 if: You have moderate winters (rarely below -15°C), want excellent value, have a smaller spa (1,000-2,000L)

Choose EVO 7 EVI if: You experience extreme winters (regularly below -15°C), have a larger spa/swim spa (2,000-3,500L), want absolute maximum efficiency

Do I still need my electric heater?

For most users, no—the heat pump provides all the heating you need. However, you may want to keep the electric heater for:

• Backup heating during servicing or if heat pump requires repair
• Hybrid operation using the NEXUS EVO 6’s Hybrid Logic feature for ultra-fast heat-up
• Holiday let/commercial applications requiring rapid turnaround between clients
• Extreme weather backup in climates colder than -20°C

The heat pump’s electric heater control terminals allow you to automate when the electric heater assists, giving you the best of both worlds: efficient everyday heating plus rapid boost capability when needed.

What warranty is included?

Warranty terms vary by retailer. Please contact us for current warranty coverage details. Standard coverage typically includes:

• Parts and labor for manufacturer defects
• Compressor protection
• Refrigerant system coverage

Not covered: Freeze damage due to improper winterization, damage from incorrect installation, lack of water flow protection, use outside specified operating ranges, or modifications to the unit.

Warranty validity requires professional installation and adherence to maintenance schedules. Keep your proof of purchase and installation certification.

Can I install it myself to save money?

While technically possible for those with HVAC, electrical, and plumbing experience, we strongly discourage DIY installation for several reasons:

Safety Risks:

• 240V electrical work requires certified electrician (legal requirement in most areas)
• R32 refrigerant system is sealed—no user serviceable parts
• Improper electrical installation risks fire, shock, or equipment damage

Warranty Concerns:

• Most warranties require professional installation
• DIY installation often voids manufacturer coverage

Performance Issues:

• Incorrect pipe sizing/routing reduces efficiency
• Poor electrical connections cause nuisance tripping
• Improper clearances lead to recirculation and poor performance

Code Compliance:

• Building codes require certified electrical work
• Insurance may not cover DIY electrical faults

For peace of mind, warranty protection, optimal performance, and safety compliance, professional installation is the recommended route.

🌟 Perfect For

✅ Hot Tub Owners seeking dramatic running cost reduction

✅ Swim Spa Operators in cold climates requiring reliable heating

✅ Holiday Let Businesses needing Hybrid Logic rapid heat-up

✅ Eco-Conscious Users wanting sustainable, low-GWP refrigerant systems

✅ Cold Climate Installations where other heat pumps fail (to -20°C)

✅ Existing Spa Upgrades looking to replace inefficient electric heaters

✅ New Builds incorporating future-proof, efficient technology

✅ Commercial Spas requiring low operating costs and smart control

✅ Off-Grid Systems (with solar) maximizing renewable energy use

✅ Noise-Sensitive Areas needing whisper-quiet operation

⚠️ Important Safety Information

Before Operating:

• Read the complete user manual thoroughly
• Ensure professional installation by qualified technician
• Verify all electrical connections are correct and secure
• Confirm water flow is adequate (3.0 m³/h minimum)
• Check all plumbing for leaks
• Ensure proper earthing is installed

During Operation:

• Never operate without water flow (heat exchanger damage)
• Do not touch electrical components with wet hands
• Keep air inlet and outlet clear of obstructions
• Do not place objects on top of unit
• Keep children away from moving fan and electrical connections
• Ensure condensate drainage is unobstructed

Maintenance & Service:

• Always disconnect power before servicing
• Only qualified technicians should access refrigerant system
• Never use near flammable gases or materials
• Do not modify electrical components
• Use only manufacturer-specified replacement parts

Winterization: If shutting down for winter:

• Disconnect power supply
• Drain all water from heat exchanger completely
• Follow manual winterization procedures
• Cover unit to protect from weather
• Critical: Frozen water damage is NOT covered by warranty

Emergency Shutdown: If you experience:

• Water leakage from unit
• Unusual burning smell
• Excessive noise or vibration
• Fault codes appearing repeatedly
• Electrical sparking or arcing

Immediately: Turn off power at breaker, contact qualified service technician, do not attempt to restart until issue is resolved.

🎁 Why Buy from Parts4Tubs?

✅ Authorized Vian Dealer – Genuine products with full manufacturer support

✅ Expert Advice – Knowledgeable team can help size and configure your system

✅ Fast UK Delivery – Quick dispatch on in-stock items

✅ Competitive Pricing – Great value on professional-grade equipment

✅ Complete Spa Solutions – Everything you need for your hot tub or swim spa

🚀 Ready to Save Up to 70% on Your Heating Costs?

The Vian Power NEXUS EVO 6 represents the pinnacle of spa heating technology—combining extreme cold weather capability, market-leading efficiency, smart connectivity, and universal compatibility in a compact, quiet, reliable package.

With a COP of up to 12.5, you’re not just buying a heat pump—you’re investing in:

• Drastically lower energy bills for years to come
• Year-round usability even in harsh winters
• Environmental responsibility with eco-friendly R32 refrigerant
• Modern convenience with WiFi app control
• Professional performance engineered for demanding climates
• Future-proof technology that works with your existing spa systems

Stop wasting money on inefficient electric heating. Make the switch to intelligent, inverter-driven climate control that pays for itself through energy savings.

Your spa. Your comfort. Incredibly efficient.