Based on the theory of the Five Elements, the Water element restrains the Fire element, so the two are incompatible. However, it should be noted that if both are balanced, they can coexist, just like when fire is strong and water is moderate, they can complement each other. It is important to note that if fire is too strong and water is weak, or vice versa, it will not work. Water can restrain fire, but if there is too much fire, the water can easily be dried up. If fire is weak and encounters water, it will inevitably be extinguished.
If it is the sea water, and it meets the "Buddhist lamp fire," it is naturally unlucky, because the sea water is strong and fierce, while the Buddhist lamp fire is an ordinary fire in the world, which cannot match the strength of the sea water. Similarly, the spring water and the stream water also clash with the "Sun fire." This is because the stream water is not in a high place where water flows, but in a low and moist area where water gathers, flowing underground. When it comes to summer, the Sun fire is at its brightest. The stream water is different from other types of water. This kind of water will dry up when it meets an excessive amount of Sun fire.
However, the Sun fire and the sea water are very compatible. The Sun fire is a divine fire from the sky, with the strongest flame, and generally, no water can restrain it. The sea water is boundless and can coexist with the Sun fire, achieving a good balance of Yin and Yang, leading to a harmonious marriage and good fortune.
In addition, whether two people are compatible also depends on the combination of their birth charts and zodiac signs to determine whether they can stay together.

From the perspective of the Five Elements' mutual generation and restraint, water and fire belong to mutual restraint. If the two are together, there will inevitably be many conflicts. If one side dominates completely, the marriage will surely have some cracks.
The mutual restraint between the Water element and the Fire element makes the couple incompatible. The best way to break this is to have a child with the Wood element, forming a pattern where water generates wood, and wood generates fire, thus transforming the restraint into mutual generation. In the Five Elements, water generates wood, and wood generates fire. Therefore, having a child with the Wood element is the best choice, as it can help regulate and improve the harmony between the couple, enhance their fortunes, and bring better luck to the family.