Does heating pad encounter water to be able to produce explosion

No.

First of all, the outer packaging of the warmer pad is a waterproof material, which can isolate the water into the interior, and the temperature generated by the warmer pad is low, generally not more than 60 degrees Celsius, and the temperature is not enough to the degree of the explosion, so the use of warmer pad is still very safe.

If the use of a heating pad in the process of bulging, breaking, bursting, and so on, it is because of the quality of heating pad problems, rather than because of the water and explosion.