Of all weapon based heal skills I'm aware of, steam surge (Dagger Fire/Water Dual) is the weakest of them all. This is based off comparison, since every other Ele skill either grants regeneration or a water field of 4 sec.
The only heal skills that doesn't meet the above criteria are dagger skills. Cone of cold at least provides higher healing with a lower cooldown. Cleansing wave already clears two conditions, with a burst heal of 2.5 k. Steam surge on the other hand has an 18 second cooldown, lower healing, and a water field of only 2 seconds!
All other weapon skills either provide higher healing, longer water-filled, regeneration, and/or similar damage. Given the fact that dagger Weaver relies on evades and sustain, the water field for steam surge should be buffed from 2 to 4 seconds. This would align it with all other skills and would allow much easier access to combos.