The invention relates to the field of bathroom equipment, in particular to a behind-valve water storage type heating system. A heating stick used for heating water is arranged in the water storage type heating system. The water storage type heating system is further provided with a steam discharge and pressure release devicesystem and a dry burning prevention device. An automatic power-off device or an automatic water supplementation device can serve as the dry burning prevention device. When water steam generated during water heating of the water storage type heating system and water flowing out due to thermal expansion size increase are discharged to a floor drain or a small water storage box through a hydraulic power switching valve or a water release water way of a three-way device, it is ensured that a water outlet of a faucet can not drip water or discharge water steam all the time, and customer use is not influenced. A bipolar jump temperature limiter is omitted, a water level switch is adopted, and therefore when the water level falls after no water enters for a long time, the water level switch conducts induction and turns off the heating stick turns on an electromagnetic valve to supplement water and prevent dry burning, water in an inner container is prevented from being dried out, and the service life of the heating stick is prolonged.