How do tankless water heaters work?

^{How do tankless water heaters work: When you turn on the tap, cold water begins to flow into the tankless water heater. A built-in flow sensor automatically activates the heating element within the heat exchanger, instantly warming the water. This means you get hot water within seconds — and as long as the tap remains open, the unit continues to heat the water. Unlike traditional or solar water heaters, the hot water supply never runs out. The higher the power rating of the unit, the faster it can heat the water and the greater the flow rate it can deliver at your selected temperature. For this reason, it’s a good idea to review the unit’s performance chart before purchasing — it shows how flow rate varies depending on power level and inlet water temperature, helping you choose the model that best meets your needs. If the tankless water heater is self-regulating (digital inverter), it automatically adjusts its power output to maintain the desired temperature, providing additional energy savings. Such units can also be installed in series with other hot water systems, such as solar heaters or central heating boilers. In this setup, the tankless heater activates only when the incoming water temperature is below the desired level, consuming just the extra energy required to reach the set temperature. Modern tankless water heaters are rated energy efficiency class A. All certified models also feature multiple safety protections, including thermal cut-off and electric shock protection devices, ensuring completely safe operation.}