25W 50W 75W 100W 300W Aquarium Heater for 5L-300Litres Fish and Turtle Tank UK
25W - suitable for 4-30 litre aquariums or aquariums up to 46cm in length. 300W - suitable for 135-270 litre aquariums or aquariums up to 122cm in length. 50W - suitable for 23-45 litre aquariums or aquariums up to 46cm in length.