So I went trough the trouble of finding out the maximum healing output of Reaper in full BIS heal gear
At maximum while out of combat you can have either 2200 healing power with 68% outgoing heals or 2400 healing power at 48% outgoing healing.
In combat and in best conditions (sitting at 25% or less health) you can have 2900 healing power...this almost never happens.
Anyway, using life from Death combined with sigil of renewal, you can heal for a maximum of 9000 every time you enter and exit shroud. Normally this number is 8000.
Using Reaper 4(transfusion traited) you can heal for 18,000 health under normal conditions and probably around 20000 in ideal conditions
Blood wells heal for 12,000 on the initial tick and an extra 2000 every subsequent tick, totaling 22,000 heals under normal circumstances. This number is drastically higher in ideal conditions.
Dagger 2 heals at maximum about 8,000. Haven’t really tested this too well.