Elecro Heaters are suitable for use with all types of swimming pools and filtration systems. Fully pre-wired Elecro heaters are are simple to install. Both Titanium and Stainless Steel heating elements have a long life expectancy. Garden Leisure thermastaically controlled above ground pool heaters. Thermalec Electric heaters are high quality British made with over 30 years experience. Thermalec Electric heaters are normally used for In-Ground Outdoor pools.