The sales price of the product you have examined is determined by the seller. tetratec ht 25 aquarium heater 25 w 25-50 lt volume. it is a water heater for large aquariums with a minimum height of 20 cm. after it is placed upright in the aquarium. it is used by fixing it to the glass with the suction cups on it. instructions for use the heater is inside the aquarium. after it is fixed, the desired temperature is adjusted with the heat adjustment button located at the top. then, water is filled up to the level with the green "water level" inscription on the heater and the heater is plugged into the socket. the heater will start working in a few minutes. as long as the heating process continues, the "on" warning light on it will be seen as red. when the heating process is over, this warning light will turn off. ht 25 - a sensitive automatic thermostat system, starts to work by sensing even temperature differences of - 0.25 degrees and when the temperature of the water reaches the desired level, the temperature is automatically stabilized and stops working. since this product cannot be repaired, the instructions for use should be observed. it is guaranteed for 2 years. water level. if it is under the "water lever" statement on the heater, it should never be plugged into the outlet. it should never be plugged into the outlet except for water. water change. in the case of aquarium cleaning and similar cases, the heater must be unplugged first. warning however, it should not be taken out of the water immediately and waited for 15 minutes. then it should be removed. otherwise, the heater may break. maximum 10 pieces of this product can be ordered. swordslife reserves the right to cancel orders over 10 units. there is less than 5 units in stock to be sold at the campaign price. a product can be sold by more than one seller. sellers of products offered for sale by more than one seller are listed according to the price they set for the product, seller ratings, delivery status, promotions on the products, whether the cargo is free or not, whether the products can be delivered with fast delivery, and the stock and categories of the products. Create a party-ready atmosphere with this colorful LED lighting. Easy to install and perfect for events or home decoration.