Does a tankless water heater need a check valve?

check valve for tankless water heater. It’s probably a water supply co regulation to stop any possibility of back flow into the mains causing contamination. If you have a tank the fill pipe is usually above the water level which stops back flow so no need for a valve in that case.Click to see full answer. Similarly, is a check valve needed on a water heater?Check valves are important in a water heater because they prevent flooding or overflowing. They also stop the water from constantly flowing backwards, even when the heater is off. This prevents eroding of the pipes and saves power.Furthermore, do you need a pressure tank with a tankless water heater? The IPC does not specifically require a thermal expansion tank or other device be installed with a tankless water heater. While this appears to imply that thermal expansion-induced pressure increases are only created by storage tank water heaters, this is not the case. Also to know, do tankless water heaters need pressure relief valves? Pressure-relief valves are an essential component of tankless water heaters. The valves allow you to manually release air from the heating chamber when filling the chamber with water for the first time, or during periodic maintenance. This action immediately lowers the pressure inside the water heater tank.Do you need a check valve on a recirculating pump?It is true that if the pump is always running, you may never need the second check valve. However, the energy codes no longer allow recirculating pumps to run continuously. They are required to be controlled with a shutdown period. Check valves make sure that water only goes in the direction of flow we want.