The cost of a new hot water system in Australia depends on its type, capacity, energy source, brand and installation requirements. Electric storage systems are often the lower-cost option upfront, while gas, heat-pump and solar systems can cost more initially but may reduce running costs over time. Allow extra for plumbing changes, electrical work, removal of the old unit or difficult access, and ask a licensed plumber for an itemised quote. Rebates may be available in some states or territories, but eligibility and amounts are decided under the relevant government program.