It is the tallest temple in Bagan. It is not the tallest structure in Bagan, however; the tallest is the Shwesandaw Pagoda, which is at least  tall, without counting the hti spire.
The tallest temple in Bagan is also not the tallest structure in Bagan, although the Shwesandaw Pagoda is taller than it, at least [height] meters tall, excluding the hti spire.