Big comfort. Small footprint.

5 kW of efficient heating in a compact, 33 kg body. Average COP 9.1 at 50% speed. Works from -5°C to 43°C. Quiet confidence, year-round comfort.

Why you’ll love it

• Lower running costs. High COP performance means far less energy used than a standard electric heater.
  
• All-season ready. Heats reliably even in cold UK weather.
  
• Built to last. Twisted titanium heat exchanger resists corrosion for long life.
  
• Easy to live with. 230V single-phase supply. Light, compact, and simple for our team to fit.
  

Designed for hot tubs

Ideal for most domestic spas. Advises 5–20 m³ water volume, which covers the vast majority of home hot tubs. We’ll confirm suitability for your model.

How it works

Like an air-con in reverse, the SW50 draws heat from the air and transfers it into your water via a high-efficiency heat exchanger. You get steady temperatures with far less power. Simple, clean, efficient. 

Quick install, tidy footprint

• Power: 230V 1-phase
  
• Clearance: 450 mm at the air inlet, 1500 mm at the fan outlet
  
• Typical mounting: outdoors with short pipe runs to your spa cabinet
   Our installers handle the plumbing into your tub’s system and set clearances for best performance.
  

Specs at a glance

• Heating capacity: up to 5.0 kW (Air 27°C / Water 27°C / 80% RH)
  
• COP range: 13.0–6.0 (avg. COP 9.1 at 50% speed)
  
• At cooler conditions (Air 15°C / Water 26°C / 70% RH): 3.5 kW, COP 6.8–4.5 (avg. 6.2)
  
• Operating air temperature: −5°C to 43°C
  
• Heat exchanger: Twisted Titanium
  
• Dimensions (L×W×H): 682 × 318 × 598 mm
  
• Weight: 33 kg
  
• Supply: 230V 1Ph
  
• Recommended volume: 5–20 m³
  
  

Will it fit my space?

Yes, in most gardens. It’s compact and light, and only needs clear airflow at the front and rear. We’ll advise the neatest siting when we plan your install. 

Ready to feel the difference?

Order online today, or speak with our spa specialists for clear, friendly advice. You can also see it in person at our Nottingham showroom.

FAQ

Does it work in winter?
Yes. It delivers heat down to −5°C ambient with proper siting and clear airflow. Performance improves as air temperature rises.

How much will I save?
Savings depend on usage, tariff, siting, and climate. The high COP figures above show why running costs can be significantly lower than using an electric heater alone. 

What power does it need?
A standard 230V single-phase supply. We’ll confirm the exact setup during your survey. 

What clearances are required?
Allow at least 450 mm at the air inlet and about 1500 mm in front of the fan outlet. 

Heat smarter. Spend less. Enjoy more.