Freezing measures of indoor water heater The original state of the water heater：
① Off the gas valve
② Switch the operating switch to "off"
③ Unplug the power plug, cut off the power supply (do not operate with wet hands) ④ close the inlet valve
④ Close the inlet valve
⑤ Open the outlet valve
⑥ Counterclockwise rotation remove the discharge valve and drain bolt
⑦ After completing the operation of the ⑥ after 1 After more than 0 minutes to confirm that it has been completely drained, and tighten the drainage bolt and the pressure relief valve and close all the outlet valves