🌊 Aquark Mr Silence MS70 Inverter Heat Pump – 7kW | Ultra-Quiet Hot Tub & Pool Heating Solution

Transform Your Hot Tub or Pool Experience with Whisper-Quiet, Ultra-Efficient Heating

The Aquark Mr Silence MS70 is a premium 7kW inverter heat pump specifically engineered for hot tubs, swim spas, and small pools up to 30m³. Combining revolutionary InverPad® technology with exceptional energy efficiency, this heat pump delivers powerful heating performance at sound levels as low as 36.5 dB(A) – quieter than a modern refrigerator. Save up to 80% on heating costs compared to traditional electric heaters while enjoying year-round comfort and smart WiFi control.

✅ Key Benefits at a Glance

Ultra-Silent Operation – Average 40 dB(A), as low as 36.5 dB(A) in Silence Mode
Exceptional Efficiency – COP up to 16, average 10.4 at mid-speed operation
Massive Energy Savings – Up to 80% reduction in heating costs vs. electric heaters
Smart WiFi Control – Control from anywhere via InverGo app
Premium Build Quality – Rust-free aluminium alloy cabinet, Mitsubishi compressor
Year-Round Performance – Operates efficiently from -10°C to 43°C
Perfect Size Range – Ideal for hot tubs, swim spas, and pools 15-30m³

🔥 Why Choose the Aquark Mr Silence MS70?

Whisper-Quiet Performance You Can Barely Hear

The revolutionary patented back-discharge airflow design makes the MS70 one of the quietest heat pumps available. Unlike traditional heat pumps that disturb your relaxation with loud fan noise, the Mr Silence operates at just 40 dB(A) on average – similar to a quiet library. In dedicated Silence Mode, noise drops to an incredible 36.5 dB(A). You’ll spend more time enjoying your hot tub and less time being bothered by equipment noise.

Industry-Leading Energy Efficiency

The MS70’s InverPad® stepless DC inverter technology intelligently adjusts compressor speed to match heating demand. This smart modulation delivers a Coefficient of Performance (COP) of up to 16 – meaning for every 1 kW of electricity consumed, you get up to 16 kW of heating output. The average COP at 50% speed is 10.4, ensuring you’re getting maximum efficiency during normal operation when maintaining water temperature.

What This Means for Your Bills:
If a traditional 3kW electric heater costs £300/year to run, the MS70 could reduce that to as little as £60/year – a saving of £240 annually. Over the heat pump’s 10+ year lifespan, that’s over £2,400 in savings.

Smart Control from Anywhere

The built-in WiFi capability with the InverGo app gives you complete control over your heating from your smartphone or tablet. Set schedules, adjust temperature, switch between Boost and Silence modes, monitor performance, and share access with family members – all from the palm of your hand.

Built to Last in All Weather Conditions

Constructed from a rust-free aluminium alloy cabinet, the MS70 is designed to withstand the UK’s unpredictable weather. Inside, you’ll find premium components including:

• Mitsubishi DC twin-rotary inverter compressor for reliable, efficient operation
• Twisted titanium heat exchanger (40% more efficient than standard designs)
• EEV technology for optimized refrigerant flow and efficiency
• Saginomiya 4-way valve for efficient defrost cycles

📊 Complete Technical Specifications

Specification	Details
Model	Aquark Mr Silence MS70
Heating Capacity	6.8 kW @ A27/W27 <br> 4.9 kW @ A15/W26
COP Range	Up to 16.0 (Low: 7.1)
Average COP	10.4 @ 50% speed (A27/W27) <br> 6.4 @ 50% speed (A15/W26)
Sound Level	36.5-46 dB(A), average ~40 dB(A)
Operating Temperature Range	-10°C to 43°C (air temperature)
Suitable Pool/Spa Volume	15-30 m³ (recommended)
Power Supply	230V, Single Phase, 50Hz
Rated Input Power	0.14-1.12 kW (variable with inverter)
Rated Input Current	0.61-4.83 A
Compressor	Mitsubishi DC Twin-Rotary Inverter
Heat Exchanger	Twisted Titanium (high efficiency)
Cabinet Material	Rust-free Aluminium Alloy
Water Connections	48.3mm (approx. 50mm/2″)
Recommended Water Flow	2-4 m³/h
Dimensions (L×W×H)	890 × 410 × 645 mm
Weight	54 kg
Temperature Control Range	18-40°C (adjustable)
Controls	Digital touch panel + InverGo WiFi app
Operating Modes	Boost Mode & Silence Mode
Protection Features	High/low pressure, anti-freeze, flow protection, full electrical protection
Refrigerant	R410A (environmentally friendly)
Defrost System	Automatic reverse cycle defrosting
Installation	Professional installation required (must be hard-wired)

🌡️ Performance Conditions Explained

Optimal Performance (A27/W27)

Air: 27°C | Water: 27°C | Humidity: 80%

• Heating Capacity: 7.0 kW
• COP Range: 14.0 to 7.1
• Average COP: 10.4 (at 50% compressor speed)

This represents peak summer conditions where the heat pump operates at maximum efficiency.

Cool Weather Performance (A15/W26)

Air: 15°C | Water: 26°C | Humidity: 70%

• Heating Capacity: 4.9 kW
• COP Range: 7.2 to 4.4
• Average COP: 6.4 (at 50% compressor speed)

Even in cooler UK spring/autumn conditions, the MS70 maintains excellent efficiency.

Cold Weather Performance

The MS70 can operate down to -10°C ambient temperature, though heating capacity and efficiency will be reduced in extreme cold. For best results in winter, use a quality hot tub cover to minimize heat loss.

⏱️ Heat-Up Time Estimates

Understanding how long it takes to heat your hot tub or pool helps you plan usage and manage expectations. Use these estimates as a guide:

Estimated Heat-Up Times for Various Water Volumes

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

Water Volume	Temp Rise 5°C	Temp Rise 10°C	Temp Rise 15°C	Temp Rise 20°C
1.5 m³ (Small Hot Tub)	1.3 hrs	2.5 hrs	3.8 hrs	5.0 hrs
2.0 m³ (Medium Hot Tub)	1.7 hrs	3.4 hrs	5.1 hrs	6.8 hrs
3.0 m³ (Large Hot Tub)	2.5 hrs	5.1 hrs	7.6 hrs	10.2 hrs
4.0 m³ (Small Swim Spa)	3.4 hrs	6.8 hrs	10.2 hrs	13.6 hrs
5.0 m³ (Medium Swim Spa)	4.2 hrs	8.5 hrs	12.7 hrs	17.0 hrs
10 m³ (Small Pool)	8.5 hrs	17.0 hrs	25.4 hrs	33.9 hrs
15 m³ (Pool)	12.7 hrs	25.4 hrs	38.2 hrs	50.9 hrs
20 m³ (Pool)	17.0 hrs	33.9 hrs	50.9 hrs	67.8 hrs
25 m³ (Pool)	21.2 hrs	42.4 hrs	63.6 hrs	84.8 hrs
30 m³ (Maximum)	25.4 hrs	50.9 hrs	76.3 hrs	101.8 hrs

*Based on 6.8 kW heating capacity at optimal conditions (A27/W27)

Real-World Performance Scenarios

Typical Hot Tub (2m³, 1000 litres):

• Heating from 10°C to 38°C (28°C rise): Approximately 9.5 hours
• Heating from 30°C to 38°C (8°C rise): Approximately 2.7 hours
• Daily top-up heating (2°C): Approximately 40 minutes

Small Swim Spa (4m³, 4000 litres):

• Heating from 15°C to 32°C (17°C rise): Approximately 14 hours
• Heating from 28°C to 32°C (4°C rise): Approximately 3.3 hours
• Daily top-up heating (2°C): Approximately 1.7 hours

Small Pool (20m³, 20,000 litres):

• Heating from 18°C to 26°C (8°C rise): Approximately 27 hours (using Boost mode continuously)
• Season opening warm-up (15°C rise): Approximately 51 hours over 2-3 days

⚠️ Important Notes:

• Times shown use 6.8 kW capacity at A27/W27 conditions (warm ambient temperature)
• In cooler weather (below 15°C), heating capacity drops to 4.9 kW, increasing times by approximately 40%
• Wind, rain, and uncovered water will significantly increase heating times
• Always use a quality thermal cover to reduce heat loss and heating times by up to 50%
• Boost Mode provides fastest heating; Silence Mode is quieter but slightly slower
• Once at temperature, the heat pump runs at low speeds maintaining temperature efficiently and quietly

🏊 Sizing Guide: Is the MS70 Right for You?

Perfect For:

✅ Hot Tubs – 1,000 to 2,500 litres (1-2.5m³)
✅ Swim Spas – Up to 6,000 litres (6m³)
✅ Small Plunge Pools – Up to 15,000 litres (15m³)
✅ Compact Pools – 15-30m³ with good thermal cover
✅ Residential gardens where noise is a concern
✅ Year-round heating in moderate UK climates

Consider a Larger Model If:

❌ Your pool exceeds 30m³ (30,000 litres)
❌ You need very fast heat-up times for large volumes
❌ Your location experiences prolonged sub-zero temperatures
❌ Your pool is completely uncovered or very exposed

💡 Pro Tip: For pools at the upper limit (25-30m³), consider the MS90 (9kW) or MS110 (11kW) models for faster heating and better efficiency in cooler weather.

💰 Running Cost Comparison

See how much you could save compared to alternative heating methods:

Annual Running Costs (Based on 2,000 litre hot tub, 38°C target, year-round use)

Heating Method	Annual Cost	MS70 Savings
3kW Electric Heater	~£900	Save £720
Standard On/Off Heat Pump	~£450	Save £270
Aquark MS70 Inverter	~£180	Baseline
Gas Heater	~£600	Save £420

Based on UK average electricity rate of £0.30/kWh. Actual costs vary by usage, location, cover quality, and ambient temperature.

Energy Consumption Breakdown

Traditional 3kW Electric Heater:

• Consumes 3 kW of electricity → Produces 3 kW of heat
• Efficiency: 100% (1:1 ratio)

Aquark MS70 Heat Pump:

• Consumes 0.65 kW of electricity (average) → Produces 6.8 kW of heat (average)
• Efficiency: COP 10.4 (10.4:1 ratio)

The Result: The MS70 produces over 10x more heat per unit of electricity compared to traditional electric heaters.

🎯 Top Features & What They Mean for You

1. InverPad® Stepless DC Inverter Technology

What It Is: Advanced variable-speed compressor control that adjusts output from 20% to 100% capacity.

What It Means: Instead of cycling on/off like traditional heat pumps, the MS70 continuously adjusts to exactly match your heating needs. This delivers:

• Dramatically reduced energy consumption (saves 50-80%)
• Much quieter operation (no noisy start-up cycles)
• More stable water temperature (±0.5°C accuracy)
• Longer equipment lifespan (less wear from cycling)

2. Boost Mode vs. Silence Mode

Boost Mode:

• Uses 20-100% compressor capacity
• Fastest heating performance
• Sound level: 40-46 dB(A)
• Perfect for: Initial heat-up, cold weather, rapid temperature recovery

Silence Mode:

• Uses 20-80% compressor capacity
• 3 dB(A) quieter than Boost mode
• Sound level: 36.5-43 dB(A)
• Perfect for: Maintaining temperature, evening/night operation, noise-sensitive areas

💡 Smart Tip: Use Boost mode for initial heat-up, then switch to Silence mode for maintenance heating – especially during evenings when you want maximum peace and quiet.

3. Automatic Intelligent Operation

Once you’ve set your target temperature, the MS70’s smart controller:

• Automatically adjusts compressor speed based on water and ambient temperature
• Runs at ~50% speed to maintain temperature (most efficient, quietest operation)
• Ramps up automatically if temperature drops
• Protects against freezing with automatic anti-freeze protection
• Self-defrosts in cold weather using reverse cycle technology

4. Premium Twisted Titanium Heat Exchanger

Why Titanium Matters:

• 40% more efficient than standard copper heat exchangers
• Corrosion-proof – unaffected by chemicals, salt, or minerals
• Longer lifespan – titanium doesn’t degrade over time
• Maintains performance – no scale build-up reducing efficiency

5. Mitsubishi DC Twin-Rotary Compressor

Industry-Leading Reliability:

• Proven Mitsubishi technology
• Smoother, quieter operation
• Higher efficiency across wide temperature range
• Reduced vibration and noise
• Extended service life (10,000+ hours)

6. WiFi Control with InverGo App

Control Your Heating From Anywhere:

• Turn heating on/off remotely
• Adjust temperature before you get home
• Switch between Boost and Silence modes
• Set weekly heating schedules
• Monitor real-time performance and water temperature
• Share access with family members
• View energy consumption data
• Receive maintenance reminders

Compatible with iOS and Android

📥 Downloads & Documentation

📄 Mr Silence MS70 User Manual (PDF) (opens in new tab)
Complete 29-page installation, operation, and maintenance guide covering the entire Mr Silence range. Includes detailed technical specifications, wiring diagrams, troubleshooting guide, WiFi setup instructions, and professional installation requirements.

🔧 Installation Requirements

Important: Professional Installation Required

The MS70 must be installed by a qualified heating engineer or pool technician. This is a legal requirement and essential for:

• Correct electrical connection (hard-wired, not plugged)
• Proper water flow configuration
• Optimal placement for efficiency and noise reduction
• Safety compliance
• Warranty validation

Electrical Requirements

• Power Supply: 230V, Single Phase, 50Hz
• Breaker: 9A minimum
• RCD Protection: 30mA residual current device required
• Wiring: 3 × 1.5mm² minimum (up to 10m run)
• Connection: Hard-wired via isolator switch (plug connection not permitted)
• Earthing: Must be properly earthed

⚠️ Warning: Electrical installation must comply with current IEE Wiring Regulations (BS 7671).

Placement & Clearance Requirements

Minimum Clearances:

• Front (air intake): 50cm clear space
• Back (air discharge): 50cm clear space
• Left side: 30cm clear space
• Right side: 30cm clear space
• Top: 100cm clear space (no overhang)

Best Location:

• Well-ventilated outdoor location (never indoor or enclosed)
• Solid, level base (concrete pad or heavy-duty frame)
• Protected from prevailing winds (reduces efficiency loss)
• Away from bedroom windows (even though very quiet)
• Within 10m of hot tub/pool (shorter pipe runs = less heat loss)
• Easy access for servicing

Plumbing Requirements

• Water Connections: 50mm (2″) pipe connections
• Flow Rate: 2-4 m³/h required
• Compatible Pumps: Max lift ≥10m
• Pipe Material: Hard PVC or rigid pipe (flexible hose not suitable alone)
• Insulation: All pipes must be thermally insulated to prevent heat loss
• Drainage: Condensate drain required (accessory included)

Important: Always start the circulation pump before starting the heat pump, and turn off the heat pump before stopping the pump.

🛡️ Protection & Safety Features

The MS70 includes comprehensive protection systems:

✅ High Pressure Protection – Prevents compressor damage
✅ Low Pressure Protection – Protects refrigerant system
✅ Flow Protection – Detects insufficient water flow
✅ Anti-Freeze Protection – Automatic activation below 5°C
✅ High Temperature Cut-Out – Prevents overheating
✅ Electrical Overload Protection – Full system protection
✅ Defrost Protection – Automatic reverse cycle defrosting
✅ Compressor Delay Timer – 3-minute protection between starts
✅ Inlet/Outlet Temp Monitoring – Continuous safety checking

Error Code Display: Built-in diagnostics display fault codes for easy troubleshooting.

🌍 Environmental Benefits

Environmentally Responsible Heating:

🌱 Over 90% of energy comes from ambient air (free, renewable energy source)
🌱 R410A refrigerant – Zero ozone depletion potential
🌱 Reduces CO₂ emissions by up to 80% vs. electric heaters
🌱 Energy-efficient operation reduces grid demand
🌱 Long service life reduces waste (10+ years typical lifespan)
🌱 Recyclable aluminium cabinet

Carbon Footprint Comparison (Annual):

• Electric Heater (3kW): ~1,800 kg CO₂
• Aquark MS70: ~360 kg CO₂
• Reduction: 1,440 kg CO₂/year (equivalent to driving 4,000 fewer miles)

❓ Frequently Asked Questions

General Operation Questions

Q: How loud is the MS70 in reality?
A: At an average of 40 dB(A) at 1 meter distance, it’s genuinely as quiet as a modern refrigerator. Most customers report they can barely hear it operating. In Silence Mode, it drops to 36.5 dB(A), which is quieter than a whisper. Unlike traditional heat pumps that can reach 60+ dB(A), the MS70’s patented back-discharge design eliminates most operational noise.

Q: Can I use it year-round in the UK?
A: Absolutely! The MS70 operates in ambient temperatures from -10°C to 43°C, covering the entire UK temperature range. However, efficiency decreases in very cold weather (below 5°C), and heat-up times will be longer. Using a quality thermal cover becomes especially important in winter to maintain efficiency.

Q: How long does it take to heat my hot tub from cold?
A: For a typical 2,000-litre hot tub heated from 15°C to 38°C (23°C rise), expect approximately 7-9 hours in moderate weather. This assumes good ambient temperature (15°C+) and a properly fitted cover. In summer, it could be as quick as 6 hours. Using Boost mode will optimize heating speed.

Q: Will it work with my existing hot tub or pool?
A: Yes, the MS70 is compatible with most hot tubs, swim spas, and small pools up to 30m³. You’ll need a circulation pump capable of 2-4 m³/h flow rate with at least 10m of head pressure. Your installer will verify compatibility and may recommend pipe modifications for optimal flow.

Q: What’s the difference between Boost and Silence modes?
A: Boost mode uses the full compressor range (20-100% capacity) for fastest heating and is ideal for initial heat-up or very cold conditions. Silence mode limits the compressor to 20-80% capacity, reducing sound by 3 dB(A) and is perfect for maintaining temperature or evening use. Once at temperature, both modes operate similarly at low speeds for efficient, quiet maintenance heating.

Q: Is professional installation really necessary?
A: Yes – absolutely essential. Professional installation ensures correct electrical connection (must be hard-wired with RCD protection), proper water flow configuration, optimal placement, and safety compliance. DIY installation will void your warranty and could be dangerous. Most installations take 3-4 hours for a qualified technician.

Q: How much will it cost to run?
A: Running costs depend on your usage, water volume, target temperature, ambient conditions, and cover quality. For a typical 2,000-litre hot tub maintained at 38°C year-round with good insulation, expect £120-200 per year at current UK electricity rates. Compare this to £600-900 for a 3kW electric heater – a saving of £400-700 annually.

Technical & Performance Questions

Q: What does COP mean and why does it matter?
A: COP (Coefficient of Performance) measures efficiency – the ratio of heat output to electrical input. A COP of 10.4 means for every 1 kW of electricity you use, you get 10.4 kW of heating. The MS70’s average COP of 10.4 is exceptional, meaning it’s over 10 times more efficient than a standard electric heater (COP of 1.0).

Q: Why does the COP vary?
A: Heat pump efficiency depends on ambient air temperature – the colder it is, the harder the heat pump works, reducing COP. At 27°C air temperature, the MS70 achieves COP up to 16. At 15°C, this drops to COP 6.4. Even at lower COP values, it’s still dramatically more efficient than electric heating. The inverter technology optimizes efficiency across all conditions.

Q: How often does it need maintenance?
A: Minimal maintenance is required. Check/clean the air intake filters every 2-4 weeks during heavy use. Annual professional service recommended including refrigerant pressure check, electrical connections inspection, and general system assessment. The titanium heat exchanger requires no descaling. Proper winterization (draining) is essential if not in use during freezing weather.

Q: What happens if it gets very cold (below -10°C)?
A: The MS70 is rated to operate down to -10°C, but performance diminishes rapidly below 0°C. In extremely cold conditions (below -5°C), the heat pump will spend more time defrosting and heating times will increase significantly. For reliable winter heating below -5°C, consider supplementary heating or a larger model. The anti-freeze protection prevents damage in freezing conditions.

Q: Can I control it without WiFi?
A: Yes! The MS70 has a full-function digital control panel on the unit itself. WiFi via the InverGo app is entirely optional but highly convenient for remote control, scheduling, and monitoring. The heat pump functions perfectly without WiFi connection if you prefer manual control.

Q: Will it work with saltwater or bromine hot tubs?
A: Yes, the twisted titanium heat exchanger is completely corrosion-proof and compatible with all sanitizer types including chlorine, bromine, salt, and mineral systems. Titanium is chemically inert and won’t degrade over time regardless of water chemistry.

Installation & Compatibility Questions

Q: Can I install it inside a pump house or shed?
A: No – the MS70 must be installed outdoors in a well-ventilated location. Heat pumps work by extracting warmth from ambient air and exhaust cool air. Installing in an enclosed space will cause efficiency loss, possible icing, and system shutdown. Adequate airflow is essential for proper operation.

Q: What size electrical supply do I need?
A: The MS70 requires a 230V single-phase supply with a 9A breaker and 30mA RCD protection. Standard 3 × 1.5mm² cable is sufficient for runs up to 10 meters. For longer cable runs, thicker cable is needed. Your installer will calculate the exact requirements based on your specific installation distance and local regulations.

Q: How close to the hot tub should I place it?
A: Ideally within 5-10 meters to minimize heat loss through pipes. Shorter pipe runs are more efficient. All plumbing should be heavily insulated. The maximum recommended distance is 10m, though longer runs are possible with appropriate pipe sizing and insulation. Balance proximity with noise considerations (though the MS70 is very quiet).

Q: Do I need to drain it in winter?
A: If you’re using your hot tub year-round, no draining needed – the MS70 has built-in anti-freeze protection. However, if you’re shutting down for winter, you must completely drain all water from the heat exchanger to prevent freeze damage. The manual provides detailed winterization instructions. Freeze damage is not covered under warranty.

Q: Can I heat a pool and hot tub with one unit?
A: Not simultaneously. The MS70 is designed to heat a single body of water. Attempting to heat multiple vessels would require complex plumbing, flow balancing, and likely wouldn’t provide adequate heating for either. For pools and hot tubs, consider separate heating systems or dedicated multi-zone heat pumps.

Warranty & Support Questions

Q: What warranty is included?
A: Aquark heat pumps typically include a 2-year manufacturer’s warranty covering parts and workmanship. Extended warranty options may be available through your retailer. Register your product after installation to activate warranty coverage. Warranty requires professional installation and proper maintenance.

Q: What if something goes wrong?
A: The MS70 has comprehensive error code diagnostics displayed on the control panel. Common issues like flow protection or high/low pressure triggers are usually simple fixes. The included manual has a full troubleshooting section. For technical support, contact your installer or Aquark’s UK service network. Never attempt repairs yourself – this voids warranty and can be dangerous.

Q: Are replacement parts readily available?
A: Yes, Aquark maintains UK parts stock for the Mr Silence range. Common components like sensors, controllers, and fans are usually available for next-day delivery. Specialist parts like compressors may take longer. The robust build quality and premium components mean parts failure is rare with proper maintenance.

Q: How long will the MS70 last?
A: With proper maintenance, expect 10-15 years of service life. The Mitsubishi compressor is rated for 10,000+ hours of operation. The titanium heat exchanger doesn’t degrade, and the inverter technology reduces wear by eliminating harsh on/off cycling. Many customers report heat pumps lasting 15+ years with annual servicing.

📦 What’s Included in the Box

✅ Aquark Mr Silence MS70 Heat Pump Unit
✅ Digital Touch Control Panel (pre-installed)
✅ Condensate Drainage Kit
✅ Installation & Operation Manual
✅ WiFi Setup Guide for InverGo App
✅ Mounting Bolts (M10)

Not Included (Required Separately):

• Circulation pump (2-4 m³/h, ≥10m head)
• Plumbing pipes and fittings (50mm/2″)
• Electrical installation materials
• Pipe insulation
• Concrete base or mounting frame
• Professional installation service

🎖️ Why Buy from Parts4Tubs?

✅ Authorized Aquark Dealer – Genuine products, full warranty
✅ Expert Advice – Knowledgeable team to help with sizing and selection
✅ Competitive Pricing – Best value on premium heat pumps
✅ Fast Delivery – Quick dispatch across the UK
✅ Installation Support – Can recommend qualified installers in your area
✅ After-Sales Service – Ongoing support and advice
✅ Quality Assured – All products tested and inspected

🚀 Ready to Transform Your Hot Tub Experience?

The Aquark Mr Silence MS70 delivers unmatched combination of whisper-quiet operation, exceptional energy efficiency, and smart control – all at an affordable price point. Stop paying hundreds of pounds a year in heating costs and start enjoying luxurious, sustainable warmth.

Perfect for:

• Hot tub owners seeking ultra-quiet, efficient heating
• Swim spa installations requiring year-round performance
• Small pool owners wanting to reduce heating costs dramatically
• Anyone who values peace, quiet, and environmental responsibility

Upgrade your heating system today and discover why thousands of UK hot tub owners have switched to the Aquark Mr Silence range.