Rinnai Hot Water System Price 2026
Rinnai hot water systems cost $809 to $6,296 for the unit alone, across 16 models we checked at Australian retailers on 13 October 2026. That covers Hotflo gas and electric storage, Infinity continuous flow, Enviroflo heat pumps and Prestige solar. Installation is extra, and the type you choose matters more than the badge: it sets both the upfront price and what you pay to run it every year.
These are unit prices. Get up to 3 installed quotes for a Rinnai or a better-value alternative, rebates applied.
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Electric storage (3 models)
Gas storage (2 models)
Gas continuous flow (5 models)
Heat pump (5 models)
Solar (1 model)
Retail prices including GST, before installation and before any rebate, from Appliances Online, Australian Hot Water, Cass Brothers, Hot Water Shop. Checked 13 October 2026; retailer prices change often.
Every Rinnai Model We Priced
Each price links to the retailer listing it came from. Sizes are tank capacity in litres, or flow rate in litres a minute for continuous flow units.
Rinnai electric storage: $938 to $1,203
| Model | Size | Unit price | Retailer |
|---|---|---|---|
| Rinnai Hotflo Plus 160L 3.6kW Electric Storage | 160 L | $938 | Cass Brothers |
| Rinnai Hotflo Plus 250L 4.8kW Electric Storage | 250 L | $1,037 | Cass Brothers |
| Rinnai Hotflo 315L 4.8kW Electric Storage | 315 L | $1,203 | Cass Brothers |
Typical running cost for this type: $1,200 - $1,800 a year (household estimate).
Rinnai gas storage: $1,099 to $1,282
| Model | Size | Unit price | Retailer |
|---|---|---|---|
| Rinnai Hotflo 135L Gas Storage | 135 L | $1,099 | Cass Brothers |
| Rinnai Hotflo 170L Gas Storage | 170 L | $1,282 | Cass Brothers |
Typical running cost for this type: $800 - $1,200 a year (household estimate).
Rinnai gas continuous flow: $809 to $3,379
| Model | Size | Unit price | Retailer |
|---|---|---|---|
| Rinnai Infinity B16 Continuous Flow 50C | 16 L/min | $809 | Cass Brothers |
| Rinnai Infinity B26 Continuous Flow 50C | 26 L/min | $966 | Cass Brothers |
| Rinnai Infinity 26 Enviro Continuous Flow 50C | 26 L/min | $2,199 | Cass Brothers |
| Rinnai Infinity 32 Continuous Flow 50C | 32 L/min | $2,552 | Cass Brothers |
| Rinnai Infinity 32L Continuous Flow 50C | 32 L/min | $3,379 | Appliances Online |
Typical running cost for this type: $800 - $1,200 a year (household estimate).
Rinnai heat pump: $2,740 to $4,293
| Model | Size | Unit price | Retailer |
|---|---|---|---|
| Rinnai Enviroflo A Series 180L Heat Pump | 180 L | $2,740 | Hot Water Shop |
| Rinnai Enviroflo 215L GR Series Heat Pump | 215 L | $2,895 | Cass Brothers |
| Rinnai Enviroflo 280L GR Series Heat Pump | 280 L | $3,199 | Cass Brothers |
| Rinnai Enviroflo 300L AR Series Heat Pump | 300 L | $4,038 | Cass Brothers |
| Rinnai Enviroflo S 7.0kW Split Heat Pump, 250L tank | 250 L | $4,293 | Cass Brothers |
Typical running cost for this type: $200 - $400 a year (household estimate).
Rinnai solar: $6,296
| Model | Size | Unit price | Retailer |
|---|---|---|---|
| Rinnai Prestige 330L Roof-Mount Solar (2 panel) | 330 L | $6,296 | Australian Hot Water |
Typical running cost for this type: $150 - $400 a year (household estimate).
What a Rinnai Costs Installed
The unit is only part of the bill. A licensed plumber (and an electrician for some jobs) removes the old system, fits the new one and handles compliance. For a straight swap, the Yellow Pages Australia hot water cost guide (updated May 2026) puts labour at $500 - $800 (swap an electric storage unit for another) and $300 - $700 (swap a gas unit for another). Changing type costs more, because it can mean new wiring, a new circuit or moving the system.
- Rinnai InfinityB 26, natural gas (26 L/min): $1,981 installed from Australian Hot Water
- Rinnai Hotflo 315L 4.8kW Electric Storage (315 L): $2,075 installed from Cass Brothers
- Rinnai Hotflo 135L Gas Storage (135 L): $2,635 installed from Cass Brothers
Advertised like-for-like packages, each with the retailer's own conditions and service area. Checked 13 October 2026.
For installed prices by system type across Australia, see what a hot water system replacement costs.
Is a Rinnai Heat Pump Worth the Extra?
A Rinnai heat pump costs more to buy ($2,740 to $4,293 for the unit) but is far cheaper to run than electric or gas, at around $200 - $400 a year against $1,200 - $1,800 for electric storage. Federal certificates typically take $500 - $800 off at the point of sale, and several states add a rebate on top, which closes much of the gap.
Replacing gas in Victoria? From 1 March 2027, Victorian law requires a mains gas hot water unit that fails in an existing home to be replaced with an electric one. Limited exemptions apply, for example where there is no room for an electric unit. See what replacing gas hot water in Victoria costs.
Frequently Asked Questions
How much does a Rinnai hot water system cost?
Rinnai hot water systems cost $809 to $6,296 for the unit alone at Australian retailers, across the 16 models we checked on 13 October 2026. Electric storage $938 to $1,203; gas storage $1,099 to $1,282; gas continuous flow $809 to $3,379; heat pump $2,740 to $4,293; solar $6,296. Installation is extra.
What is the cheapest Rinnai hot water system?
The cheapest Rinnai unit we found was the Rinnai Infinity B16 Continuous Flow 50C (16 L/min) at $809 from Cass Brothers, supply only. The cheapest to buy is rarely the cheapest to own: running costs differ by hundreds of dollars a year between system types.
How much does it cost to install a Rinnai hot water system?
For a straight swap, installation labour typically runs $500 - $800 (swap an electric storage unit for another) and $300 - $700 (swap a gas unit for another), according to the Yellow Pages Australia hot water cost guide (updated May 2026). Retailer installed packages we checked for Rinnai ranged from $1,981 to $2,635. Switching type, for example gas to a heat pump, usually adds electrical and plumbing work, so get a quote for your home.
How much is a Rinnai heat pump hot water system?
Rinnai heat pumps cost $2,740 to $4,293 for the unit at the retailers we checked. Federal small-scale technology certificates typically take $500 - $800 off the price, usually as a point-of-sale discount from the installer, and some states add more on top.
Can I replace a gas Rinnai hot water system with another gas one in Victoria?
Until 28 February 2027, yes. From 1 March 2027, Victorian regulations stop plumbers installing a new mains gas water heater in an existing home, including replacing a failed one, with some exemptions. Most Victorian households replacing mains gas hot water will need an electric option such as a heat pump.
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