The word(s) "heaven" appears 287 time(s) in 275 verse(s) in Quran in Mohsin Khan translation.

(121) See you not that Allah drives the clouds gently, then joins them together, then makes them into a heap of layers, and you see the rain comes forth from between them; and He sends down from the sky hail (like) mountains, (or there are in the heaven mountains of hail from where He sends down hail), and strikes therewith whom He wills, and averts it from whom He wills. The vivid flash of its (clouds) lightning nearly blinds the sight. [Tafsir At-Tabari].

(122) Certainly, to Allah belongs all that is in the heavens and the earth. Surely, He knows your condition and (He knows) the Day when they will be brought back to Him, then He will inform them of what they did. And Allah is All-Knower of everything.

(123) He to Whom belongs the dominion of the heavens and the earth, and Who has begotten no son (children or offspring) and for Whom there is no partner in the dominion. He has created everything, and has measured it exactly according to its due measurements.

(124) Say: "It (this Qur'an) has been sent down by Him (Allah) (the Real Lord of the heavens and earth) Who knows the secret of the heavens and the earth. Truly, He is Oft-Forgiving, Most Merciful."

(125) And (remember) the Day when the heaven shall be rent asunder with clouds, and the angels will be sent down, with a grand descending.

(126) Who created the heavens and the earth and all that is between them in six Days. Then He (Istawa ) rose over the Throne (in a manner that suits His Majesty). The Most Gracious (Allah)! Ask Him (O Prophet Muhammad صلى الله عليه وسلم , concerning His Qualities: His rising over His Throne, His creations, etc.), as He is Al-Khabir (The All-Knower of everything i.e. Allah).

(127) Blessed be He Who has placed in the heaven big stars, and has placed therein a great lamp (sun), and a moon giving light.

(128) If We will, We could send down to them from the heaven a sign, to which they would bend their necks in humility.

(129) [Musa (Moses)] said: "The Lord of the heavens and the earth, and all that is between them, if you seek to be convinced with certainty."

(130) "So cause a piece of the heaven to fall on us, if you are of the truthful!"