More expensive than an electric water heater, however, the thermodynamic water heater saves energy. It is therefore a profitable investment in the medium term. To understand how a thermodynamic water heater can enable you to save energy, you simply need to know that this type of appliances work as a heat pump on the principle of calorie recovery from air to heat the water of a balloon, using energy available all over the air and therefore free, inexhaustible and clean. Today, this system is the cheapest and most cost-effective method of producing domestic hot water. At eWorldtrade.com, you are sure to find the best Solar Water Heaters of all well-known brands by official suppliers and manufacturers that meets your needs.