So I have been class jumping quite a bit, experimenting with different ideas, weapons, spells, and finding differences between classes. We all know what the Templar can do as a healer, and Sorcerers along with Nightblades have become rather renowned as healers as well.
What I have not seen much of is healing as a Dragon Knight, so I thought I might delve into the idea of it a bit. (BTW, I am not saying there are NO Dragon Knight healers, so if you are a Dragon Knight healer, please feel free to share your thoughts or bash my thread based on your experiences).
Initially looking at the skill lines, particularly the Earthen Heart line, I felt the Dragon Knight could excel very well in two things, buffing and absorbing. Here is a skill setup that I would put together for general dungeon play:
Skill Bar 1: Healing Springs/Mutagen/Healing Ward/Igneous Shield/Spell Symmetry
---Ultimate: Magma Shell
Skill Bar 2: Siphon Spirit/Burning Talons/Eruption/Combat Prayer/Molten Armaments
---Ultimate: Magma Shell
Bar 1 would be your main healing bar, offering 3 sources of absorption through Healing Ward, Igneous Shield, and Magma Shell (I am unaware if the absorbs will stack, I would highly doubt they do, but none the less it should be easy enough to keep the effect up on party members). Spell Symmetry allows us to manage our magicka, along with a small bit of help from Healing Springs.
Bar 2 serves as a utility bar, offering some CC through Burning Talons and Eruption for large packs of mobs, while also adding some boss utility with Siphon Spirit, and obviously you will want to keep Molten Armaments up (With it's decent up time I only put it on one bar, weapon swapping does not bother me). Combat Prayer was kind of a filler, but truly I treat it as a buff spell only and not relying on it for it's heal.
For a skill calculator look here is a link, enjoy!:
http://esohead.com/calculator/skills#mzzzvvk9cW0mii8heam8heaj8heqM8Gsdx8A4fp8Gsb48hesI8uvZT8Gsbt8heRJ8GRFH8Gsb48L7JcdoQr6MdoQC6MdoQF6MdoQJ6MdoQK8e7Hraqk6Laqq6LaqS6Mi4bD6Mi4bU6Mi4bX6Mi4b16Mi4b48v7HLanQ6ranS6LanU6LanW6LanX6Mhy3D6Mhx0n6Mhx0y6Mhx0l6Mhx0B8E7DmzmW6rzmY6Lzm16LzVS6LzVW6MuciH6MuciS6Muci46Muchq8l7mmzoC6rzkA8B7JrzRf6Lzsa6Lzsq6Lzsb6rzsw6MGkXa6MGkXf6MGkXG6MGkXN8O7RrdeC6rdeF8zc7pcgePB6zgeXm6cgeXA6cgeYc8zf7zzNbo8zu7zzHfYE6zHfZd8zG7zzHQ3F8zI7zzJIoX6zJIkL8zN7zzJZcY8zA7zzKpUN8zL7zzK4EX