How fast a medic can heal soldiers, in terms of Hitpoints per frame, with there being 30 frames a second that the engine performs this function. Medics heal using:
for healing others (0.25 * 30 fps = 7.5 hitpoints/second) within HealDistance meters, and:
(0.15 * 30 fps = 4.5 hitpoints/second) for healing themselves.
In contrast, SupplyDepot objects use SetHealth for healing people.
Source and more details