Aquark® Mr Silence 9kW Air Source Heat Pump for Hot Tub/Swim Spa/Pool Huge saving on running costs - lower your energy bills by up to 50% a year Environmentally friendly - save the planet, save your pocket Works in a temperature variant of -10 to 43 degrees for use all year round Suitable for hot tubs, swim spas and larger pools up to 45m³ Extremely powerful at 9kW for faster heating times Adapts intelligently to heating demands with average COP of 10.4 Extra quiet - as silent as a fridge starting at just 36.5dB Rust-free aluminium cabinet and high-quality Mitsubishi compressor Easy to use smart controls via the app or display panel