It is not heaven, but Vaikunta (the heavenly abode of Lord Vishnu), which is eternal and above the swarga lokas.
According to Madhva's Dvaita philosophy, if the soul attains moksha, it reaches Vaikunta and stays there eternally. Madhava's Dvaita philosophy (and also pushimarga?) allows for eternal hell also. Some souls are eternally doomed and can never attain salvation, according to this philosophy.
From the encyclopedia,
Madhva preached predestination and the existence of an eternal heaven
and hell. He believed as well that eternal salvation is possible
through the continuous practice of bhakti..
However, this is different from the eternal hell and heaven of Christianity. Abrahamic hell is because God sits and judges you based on only the actions done in this lifetime. While here, it is dependent on karmas and several cycles of birth and death.