A Victorian man convicted of murdering his estranged partner and disposing of her body in a hot water cylinder has been jailed for 32 years.

A Victorian Supreme Court jury sitting in Mildura found Thomas Halliday guilty of murdering his former de facto wife, Shelley Joy Stephenson, who disappeared on March 2, 2006.

Her body has never been found.

The jury was told Halliday killed Ms Stephenson and then placed her body in a disused hot water cylinder, which he filled with gravel and dumped in the Murray River.

At a Mildura sitting of the Supreme Court on Thursday, Justice Elizabeth Hollingworth jailed Halliday for a minimum 24 years.

The sentence takes into account convictions Halliday received for other offences that are subject to court suppression orders.