The principle of a heating heat exchanger is to utilize the heat from heating water to exchange heat with tap water, thereby heating the tap water and facilitating the use of hot water during winter. However, at the same time, it also poses a potential hazard to the safety of residents' drinking water. Tap water flows through the heat exchange tubes, while heating water flows on the outside, forming heat exchange and heating the tap water. Due to long-term use, the heat exchange tubes of the heating heat exchanger may expand and contract, or due to poor quality of the heating heat exchanger, its heat exchange tubes may corrode and develop leaks. Generally, the pressure of heating pipes is around 0.42 MPa, while the pressure of tap water pipes is around 0.35 MPa, with the pressure of heating pipes being higher than that of tap water pipes. When there are leaks in the heat exchange tubes, heating water leaks into the tap water pipes through the heat exchanger's leakage points, causing tap water pollution. The boiler water required for heating is generally sourced from tap water, which is softened and treated into boiler water. In the treatment process, ion exchange or chemical methods (such as adding chemicals like phosphates, ethylenediaminetetraacetic acid (EDTA), and aminotriacetic acid, all of which are harmful to human health) are commonly used. Sometimes, to prevent users from stealing heating water, boiler rooms may add harmful substances like waste engine oil and industrial dyes to the boiler water. Additionally, boiler water also contains scale and rust corroded from the heating pipes. Therefore, when heating water leaks into the tap water pipes through the leakage points of the heat exchanger, it can cause serious pollution to tap water, potentially affecting the entire community's water supply. If accidentally consumed, it can also pose a certain degree of harm to human health.