When a plumbing failure has caused damage, what you record in the first hour affects what happens afterwards.
Stop the water first. Nothing else matters until the source is isolated, whether that is the mains stop tap, a fixture isolation valve or the hot water unit's isolation point.
Then photograph before anything is moved or cleaned up. Photograph the source of the water if it is visible, the extent of the water, and the affected contents and surfaces. Wide shots establish context and close shots show detail. Note the time you discovered it.
Keep any failed component. A split flexible hose, a corroded fitting or a failed valve is physical evidence of what happened and why, and it is easily thrown out during a cleanup.
Keep the paperwork, including the plumber's description of the fault and what was done about it.
Whether any of this results in a claim depends entirely on the policy and the insurer, and that is a conversation for them rather than for us. What we can do is describe accurately what failed and why, which is usually what gets asked for.
Water and electricity together are a serious hazard. If a leak is running near a switchboard, a power point, downlights or an electric hot water unit, switch off at the mains only if the switchboard itself is dry and safe to reach, then keep everyone clear and call a licensed plumber. An electrician may also be needed.