What a hot water system costs in Melbourne

What drives the price

The unit is most of the cost, and the type sets the band: Melbourne cost guides put an electric storage tank, supplied and installed like-for-like, at about $840 to $3,150, gas storage at $1,250 to $3,675, gas continuous flow at $1,575 to $3,675, and a heat pump at $3,150 to $6,300 before rebates (or $3,575 to $7,350 for the larger 300 L units a big household needs). Within each band, the size and the brand move you up or down.

Changing fuel is the big extra. A gas tank swapped for a heat pump needs a new circuit from the switchboard and the gas capped, which guides put at roughly $900 to $1,500 on top of a like-for-like install; going the other way needs a new gas line. A like-for-like swap in the same spot is the cheapest version of the job.

• Type now, and type you want: same fuel is cheapest, a change of fuel adds the circuit or gas line
• Household size: 1–2 people run on a small tank or 16–20 L/min continuous flow; 5 or more need 300 L or more
• Removal and disposal of the old unit, usually $80 to $210
• A tempering valve if the system has none, $160 to $420
• Access: an outside wall at ground level is easy; a roof, cupboard or under-house unit costs time

Rebates, and the 2027 rule

Solar Victoria’s hot water rebate pays half the price of an eligible heat pump or solar hot water system, up to $1,000, or $1,400 for a locally made product. The conditions include being the owner-occupier of an existing home, a combined taxable income under $150,000 (the cap came down from $210,000 on 1 July 2026), a home valued under $3 million, and a system being replaced that is at least three years old. It is paid in releases with limited numbers, so check availability before you sign. Victorian Energy Upgrades adds an indicative $560 (replacing gas) or $630 (replacing electric) through an accredited provider, and the retailer usually applies federal certificates at the till. They stack, and the estimator leaves them out of the range rather than guessing which you qualify for.

From 1 March 2027, the Victorian Government’s announced rule is that a gas hot water system reaching the end of its life in an existing home is replaced with an efficient electric alternative, with exemptions where there isn’t the space or the installation would be impractical; repairs stay allowed. The regulations may still change, so if you’re weighing a gas replacement, ask the plumber how the rule applies and check Solar Victoria for the current wording. The hot water guide has the detail, and rental energy standards covers rentals.

Who does the work, and the paperwork

The water connections need a licensed or registered plumber, gas connections a licensed gasfitter, and a new circuit a licensed electrician; some plumbers hold more than one, and the Building and Plumbing Commission’s register shows what each person holds. For a gas appliance, or any plumbing work over $750, the plumber must give you a compliance certificate within five days; electrical work comes with a Certificate of Electrical Safety within 30 days. See checking a tradie’s licence.

What the quote should cover

• The unit: brand, model, size and star rating, and its warranty
• Like-for-like connection, or the new circuit or gas line if the fuel changes
• Removing and disposing of the old system
• A tempering valve, and any valve or pipework the old install was missing
• The rebates and discounts applied, and who claims them
• The compliance certificate, and the electrical certificate if there’s a new circuit
• When they can do it, and how long you’ll be without hot water

Example brief

“Replace a 14-year-old gas storage hot water system on the outside wall of a single-storey house in Noble Park, household of four, with a 270 L heat pump. Please quote supply and installation, the new circuit and capping the gas, removal of the old unit, a tempering valve, and say which rebates and discounts the quote applies for. Include the compliance certificate and the Certificate of Electrical Safety.”

Before you ask for quotes

• Decide the type first; the rebates and the 2027 rule can change what’s worth installing
• Photograph the label on the current unit, and where it sits
• Check Solar Victoria’s eligibility and whether a release is open
• Ask who holds the plumbing, gasfitting and electrical licences for each part
• Compare the quotes with the same unit size and the same inclusions

The estimator’s Get quotes button carries your details into the job form as a draft. You can also start a job request from scratch, read the hot water guide, or compare the written quotes once they arrive. Availability depends on real postings, and registration must be enabled to submit.

How this estimate is built

Each line multiplies a per-unit range from the named sources by the quantity you entered, fixed items are added as their own lines, and the total is widened to round numbers. The sources were checked on 2 November 2026. It is an indicative range for comparing written quotes from a plumber who has seen the job, not a quote. See all cost guides for how the ranges are made.