Sudden warm water failings are common as tank age; mineral accumulation from tough water in parts of Geelong lowers

https://academy.educause.edu/eportfolios/12410/home/reasons-why-homeowners-trust-plumbers

Abrupt warm water failings are common as tank age; mineral build-up from hard water partly of Geelong reduces efficiency, creates rumbling sounds, and can cause leakages or irregular water temperature levels.