There are lots of ways for Arcane casters to heal.
Dread Necromancer + Tomb Tainted Soul or Necropolitan PCs = infinite healing.
The Arcane Disciple feat grants an Arcane Caster access to one domain's worth of spells. Healing Domain has most of the Cure + Heal.
Planar Handbook allows any caster to swap the ability to summon either Fiendish or Celestial creatures with Summon Monster spells for the ability to summon Vivacious creatures. A Vivacious creature has a positive energy aura which heals all living creatures within 10 ft 1 point per round. It also has an "attack" which deals 1d4+cha positive energy damage (living creatures are healed by positive energy damage) usable every 1d4 rounds.
A Warforged party can be healed via the Repair Damage line which are on the Sor/Wiz list.
10 levels of Rainbow Servant grant access to the whole Cleric list. An option for any arcane caster but it works best for Warmages and Beguilers because they can spontaneously cast any spell on their list.
The Prestige Bard class from Unearthed Arcana grants access to the Bard list to other classes that meet the requirements.
An obscure class from Dragon Compendium, the
Sha'ir can cast some domain spells as divine spells. This means it can qualify for divine Prcs. Skypledged grants access to a divine spellpool ability which includes healing.
Various arcane classes have UMD and Wand of Lesser Vigor is one of the best out of combat healing options around.
If Artificers count as an arcane casting class, they have a number of healing Infusions.