*Product May Be Subject To Extended Lead Times. The UltraZap 2kW Pond Heater is designed to efficiently warm koi ponds or fish tanks with capacities up to 8,000 litres. Equipped with a built-in thermostat, it ensures precise temperature regulation, promoting optimal aquatic health. Its compact design allows for easy integration into existing pond setups. For best results, insulate your pond to retain the generated heat.