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As a stamina templar, you want to drop cleansing ritual or rune focus (so you get major mending while standing in the area) and then use rally (2h) or vigor (assault), or even both to stack the heal over time effects and bring your health up quickly.
Rally can be 'spammed' for a burst heal instead of the lower heal over time, but that burst heal gets bigger the longer you let rally run for without recasting it. With major mending from passives, resounding vigor should bring you back up to full health fairly easily within its 5 second duration.