For open-type models, focus on these 3 critical notes:
1、The flow control valve must be installed at the water inlet, never at the outlet (when facing the unit, the right side is the water inlet, and the left side is the outlet);
2、Do not reverse the water inlet and outlet pipes, and under no circumstances should the water outlet be blocked;
3、After powering on, first turn on the water supply, then start the heating function for a 10-minute test run. Only use the unit formally after confirming it operates normally.