The Eheim Thermo 200 pond ice preventer is specifically designed to retain an ice-free zone (vent) which supports fish and aquatic life in the pond through the coldest times of the year. It will keep an area ice-free down to -20?c. Specifications: • Running power: 200 Watts. • Power cable length: 10m. • Manufacturer’s guarantee: 3 years.
eBay