Take the chill off your pool to create a relaxing swimming environment by gently heating the water. Key Features: Maximum heater output: 40 C (104 F). The tactile on/off button, automatic temperature regulation and temperature control panel make heating your pool easier than ever. The Bestway pool heaters help create comfortable water temperatures so you can experience a relaxing swim of heated bliss. This pool heater is supplied with a portable residual current device-rated residual operating current not exceeding 10m A. Compatible with above ground pools with a water capacity between 1,520-17,035 L (400-4,500 gal.) and filter pumps with flow rates up to 3,785 L (1,000 gal.). Dimensions - length: 42.6cm/16.77inch, width: 26.6cm/10.47inch, height: 18.7cm/7.36inch. Important: This product cannot be used with an extension lead or cable.