Well to put things into perspective… I ran a heroic priory and the group was getting smacked around hard like it was mythic and I had to put some work in.
Flash Heal - 36.16 mil (14.1%)
Echo of Light - 35.31mil (9.9%) ← Only 26% overhealing here which is kinda impressive it used to be 50%+.
PoM - 24.88mil (9.77%)
Holy Word Serenity - 23.20mil (9.1%)
Halo - 22.64 mil (8.9%)
CoH - 20.77 mil (8.1%)
Holy Word Sanctify - 17.55 mil (6.9%)
With having so low haste (10%) its pretty hard to keep stacks of Renew rolling, but if you add up the healing from Archon Halo + CoH… thats a lot of passive healing.
If I didn’t have CoH and Halo I would have to manually cast more Flash Heals to cover most of that healing.