14 - 2" x 12" pre-plumbed panels (hoses/clamps sold separately) roof mountable with complete system kit. Eack system kit contains a ball valve, check valve, vacuum relief valve, couplers, adapters and end caps. Increases your pool water temperature up to 10 degrees. Most efficient solar panel in the industry. Compatible with your existing pool pump. 10 year pro-rated warranty. Better than a gas/electric heater - no gas/ electric bills and no pollution