The renewed clashes in the coastal towns of Midi and Mokha, north and south of the major Red Sea port of Hodeida respectively, erupted the day after government forces seized control of the area.
"The death toll this morning stands at 14 Huthi rebels and six troops" loyal to President Abedrabbo Mansour Hadi, a military source confirmed on condition of anonymity.
Hospital sources in Hodeida confirmed at least eight dead.
Forces loyal to Yemen's president, backed by a Saudi-led Arab coalition, entered the historic port town of Mokha last month as part of a push to drive Shiite Huthis out of the area.
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Prior to the government-backed military offensive, the Huthis had controlled nearly all of Yemen's 450 kilometre Red Sea coastline.
More than 400 combatants have been killed in the fight for coastal control.
The crisis in Yemen took a major turn for the worse with the military intervention of the Saudi-led alliance in March 2015.
The United Nations estimates more than 7,400 people, including around 1,400 children, have been killed in the two years since.
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