Pressure control type water heater starting device and water heater

The invention discloses a pressure control type water heater starting device and a water heater, and the pressure control type water heater starting device comprises a pressing assembly which comprises a mounting seat and a sealing valve; a mounting cavity is formed in the mounting seat, the sealing valve comprises a valve body and a valve element, and the valve body is hermetically connected in the mounting cavity in a penetrating manner; a sealing cavity is formed in the valve body, and the valve element is movably connected into the sealing cavity in a penetrating mode. The outer wall of the valve element is in sealing fit with the inner wall of the sealing cavity. One end of the valve element forms a pressed end, and the other end of the valve element forms a pressure applying end. The pressed end is used for driving the valve element to move close to the outlet under the action of external force, so that the pressure applying end applies pressure to gas in the sealing cavity; gas in the sealing cavity is