Question

do water can not conduct heat​

Answer 1

No, pure water doesn't conduct electricity; by itself, it is a poor conductor of electricity. However, water contains charged ions and impurities that make it a very good conductor of electricity.

Answer 2

In water, the electrons are engaged in chemical bond and hence are not free to participate in conduction. Materials which conduct heat very well are known as good conductors and materials which do not conduct heat well are known as bad conductors. Water thus is a bad conductor.