How is ETA pronounced in koine Greek?
In Modern Greek, due to iotacism, the letter (pronounced [ˈita]) represents a close front unrounded vowel, IPA: [i]. In Classical Greek, it represented the long open-mid front unrounded vowel IPA: [ɛː].
How to pronounce Η?
In the traditional English "Erasmian" system, Ε is pronounced as in "red" ( /ɛ/ ), and Η and ΕΙ both as in "raid" ( /ej/ ).