*Product May Be Subject To Extended Lead Times. The UltraZap 3kW Pond Heater is tailored for larger koi ponds or fish tanks, accommodating up to 9,000 litres. It features a built-in thermostat for accurate temperature control, ensuring a stable environment for aquatic life. Its robust construction guarantees durability, while its design facilitates straightforward installation. Proper pond insulation is recommended to maximize heating efficiency.