Intex Solar Mat Pool Water Heater (4 Pack) The Intex Solar Heater Mat is an energy efficient way to capture the sun's rays to heat up your above ground swimming pool. Designed to work with a variety of Intex filter pumps, this heater warms the water with environmentally friendly solar heating technology. Uses the natural power of the sun to warm your pool water! Suitable for above ground pools up to 8000 gallons. Includes: - 1) 1/4 -inch hose attachment points - 2) adaptors B for 1 1/2-inch (38mm) hose connection - Bypass valve