Rinnai Hot Water Systems from $499
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Rinnai Hot Water Systems
Compare Rinnai electric storage, Infinity gas continuous flow, gas storage, Enviroflo heat pumps, solar and electric continuous-flow hot water by size, technology and current supply-only price.
Rinnai Australia was established in Melbourne in 1971 and is part of the wider Rinnai group. In hot water, the brand spans gas continuous flow, electric and gas storage, heat pumps, solar hot water and fully electric continuous-flow technology. For a buyer, that means “Rinnai hot water” covers very different system types that need to be compared by the correct measure: storage litres for tanks, litres per minute for gas continuous flow, and heating technology, capacity and site requirements for heat pumps.
Use this page as the main Rinnai hot water hub: understand the product families, compare sizes, choose Natural Gas or LPG correctly, compare Hotflo with Infinity, understand the Enviroflo heat-pump range, check replacement considerations and then compare current Rinnai prices before ordering.
Rinnai Hot Water Range Explained
Rinnai’s Australian residential range covers more hot-water technologies than many shoppers realise. The important distinction is between stored hot water, continuous-flow hot water and renewable/heat-pump systems because each is sized and installed differently.
Traditional electric cylinders from compact units through to large family-size tanks.
On-demand gas hot water selected mainly by flow rate, gas type and simultaneous demand.
Vitreous-enamel gas storage systems for buyers wanting stored gas hot water.
Integrated and split heat pumps across GR, AR and split-system families.
Close-coupled and split solar systems with electric or gas boosting depending on configuration.
Fully electric instantaneous hot water without a conventional storage tank.
Rinnai Hotflo Electric Hot Water Systems
Rinnai Hotflo electric storage covers capacities from compact under-bench units through to large household cylinders. The broader range includes 25L, 50L, 80L, 125L, 160L, 250L, 315L and 400L models, with QLD/WA-specific versions in selected larger capacities. Hotflo 250L and 315L models are available in single- and twin-element configurations in parts of the range.
50L, 125L & 160L
These sizes cover compact and medium-demand storage applications. The 50L is commonly considered where space and demand are limited, while 125L and 160L step up storage for households needing more reserve.
250L, 315L & 400L
Larger Hotflo tanks suit higher daily demand and are commonly compared for family replacements. The correct size depends on usage, tariff, recovery time and whether the unit can reheat during the day.
Single vs Twin Element
A twin-element model can use an upper boost element to recover a smaller volume faster when demand is high. The electrical supply and tariff arrangement must suit the selected model.
Replacement Checks
- Height and diameter
- Hot and cold connection positions
- Element rating and circuit
- Tariff and recovery requirements
- Valve, drainage and base arrangement
Rinnai Infinity & Infinity B Hot Water Systems
Rinnai is strongly associated with gas continuous-flow hot water. Infinity and Infinity B systems heat water only when a hot tap is opened rather than storing a full tank of heated water. The Infinity B range includes 12, 16, 20 and 26L/min capacities, with the B26 positioned for higher household demand.
Continuous-flow sizing is not a direct conversion from storage litres. Flow rate, incoming water temperature, climate and the number of showers or taps running at the same time all matter. Rinnai B26 delivers up to 26L/min at the stated test conditions and is positioned for larger residential demand than B16 or B20.
B16 vs B20 vs B26
B16 is the lower-flow option, B20 provides additional capacity, and B26 is the high-capacity choice in the Infinity B family. Choose based on simultaneous hot-water demand rather than simply buying the largest model.
Natural Gas vs LPG
Rinnai Infinity units are made for a specific gas type. Natural Gas and LPG versions are separate products and must match the gas available at the property.
50°C vs 60°C Models
Factory temperature settings differ across models and applications. The selected temperature configuration affects how the system integrates with the plumbing setup and any tempering requirements.
Rinnai Water Controllers
Compatible Rinnai controllers can provide convenient temperature control and additional functions on supported Infinity systems. Compatibility depends on the exact unit and controller.
Rinnai Hotflo Gas Storage
Rinnai Hotflo gas storage provides an alternative to Infinity continuous flow for homes that prefer a stored volume of gas-heated water. The current Rinnai storage range includes 135L and 170L gas models. Gas storage is usually compared by usable stored capacity, recovery performance and first-hour delivery rather than by the L/min rating used for continuous flow.
Gas storage keeps hot water ready in a tank. Infinity heats it on demand. A replacement decision should consider the existing gas supply, available space, flue/location, household demand and whether the customer wants to retain storage or move to a compact continuous-flow unit.
Rinnai Enviroflo Heat Pumps
Rinnai Enviroflo heat pumps use a refrigeration cycle to absorb heat from ambient air and transfer it into stored water. Rinnai’s current heat-pump range includes integrated GR and AR models plus split systems, giving the brand options for small through to high-demand households.
Enviroflo GR Series
The GR family spans 180L, 215L, 265L, 280L and 300L. Current models use R290 refrigerant, built-in Wi-Fi, multiple operating modes and solar-PV compatibility. Selected capacities are supplied with a 10A plug.
Enviroflo AR Series
The AR range includes 300L and 340L models for larger demand. Rinnai positions the AR as Australian designed and made, with Wi-Fi control, R290 refrigerant and low-noise operation.
Enviroflo Split
Split heat pumps separate the storage tank and refrigeration unit. Current split configurations include 250L and 315L tanks, with larger-capacity combinations also available in the wider range.
Older Enviroflo Names
You may also encounter A Series, B Series, E Series and V2 product names in older listings. Use the exact model code because specifications, warranty and current replacement options can differ between generations.
A heat pump generally uses less purchased electricity to heat water because it moves heat from the air, but it has higher upfront cost plus airflow, condensate, acoustic, electrical and clearance requirements that a basic electric cylinder does not.
Rinnai Sunmaster & Prestige Solar Hot Water
Rinnai also offers solar hot water for households wanting to use roof-collected solar energy for water heating. The Sunmaster family uses vitreous-enamel tanks, while Prestige uses stainless-steel tanks in applicable configurations. Rinnai offers close-coupled and split solar systems with electric or gas boosting depending on the design.
Solar selection depends on roof space, orientation, shading, collector type, tank location, booster type and household demand. It is a complete system choice rather than simply swapping one ground-mounted storage tank for another.
Rinnai Efinity Electric Instant Hot Water
Rinnai Efinity is the brand’s fully electric continuous-flow option. It heats water on demand without gas combustion or a conventional storage tank. Rinnai lists 14kW, 19kW and 29kW models with 50°C and 60°C output options. Because these are high-power electric appliances, electrical supply capacity is a major part of product selection.
What Size Rinnai Hot Water System Do I Need?
Storage systems and continuous-flow systems need to be sized differently. For storage, a practical demand guide is around 40L per person per day for light use, 50L average, 65L high use and 80L very heavy use. Tariff and recovery then determine how much storage reserve is required. For Infinity, focus on flow rate and simultaneous outlets rather than tank litres.
Both are family-size electric storage options. The 315L provides more stored reserve, while the 250L has a smaller tank volume. The better choice depends on actual usage, heating window, recovery and available space.
How the Main Rinnai Hot Water Options Compare
| Rinnai type | How it heats water | How to size it | Main site checks | Common reason to choose it |
|---|---|---|---|---|
| Hotflo Electric | Electric element heats stored water. | Tank litres + recovery. | Space, circuit, tariff, valves and drainage. | Simple electric storage replacement. |
| Infinity / Infinity B | Gas heats water on demand. | Flow rate + simultaneous outlets. | NG/LPG, gas supply, location, power and pipework. | Compact on-demand gas hot water. |
| Hotflo Gas Storage | Gas burner heats stored water. | Tank size + recovery. | Gas supply, flue/location, connections. | Like-for-like gas storage replacement. |
| Enviroflo Heat Pump | Heat pump transfers heat from air to stored water. | Tank size + recovery + climate. | Airflow, noise, condensate, electrical supply. | Lower electricity use than basic resistive storage. |
| Solar | Solar collectors with electric/gas boost. | Tank + collectors + household demand. | Roof, sun, tank site and booster. | Use renewable solar energy for water heating. |
| Efinity | High-power electric on-demand heating. | Electrical capacity + hot-water demand. | Available electrical supply is critical. | Electric continuous flow without gas or tank storage. |
Replacing an Existing Rinnai Hot Water System
The simplest replacement usually keeps the same technology and energy source, then matches capacity or flow rate as closely as practical. Changing system type can still be worthwhile but adds more checks.
Record model number, tank size or flow rate, gas type or electrical setup and dimensions.
Consider showers, baths, simultaneous use and whether the existing system runs out.
Check water, gas, electrical, drainage, clearances and access.
Stay like-for-like or compare another Rinnai technology if your priorities have changed.
Rinnai 250L to Rinnai 250L
Start with the current Hotflo 250L models, then confirm dimensions, element configuration and tariff rather than assuming every 250L is identical.
Old B26 / Infinity 26 to Infinity B26
Check fuel type, temperature configuration, connection positions, gas supply and any controller compatibility before replacing an older continuous-flow unit.
Gas Storage to Infinity
This removes the storage tank but changes sizing logic and can require gas-supply, pipework, power and location changes.
Electric Storage to Enviroflo
This can reduce electricity use but introduces airflow, condensate, acoustic and heat-pump electrical requirements.
Will the New Rinnai Suit the Existing Location?
Never use the product family name alone to confirm a replacement. Compare the exact height, width, depth, connection positions, clearances and access. Storage cylinders need suitable valves, pressure control and relief drainage. Infinity units need the correct gas type, sufficient gas supply, water flow and a suitable external or approved installation location. Heat pumps add airflow, condensate and noise considerations.
Rinnai Hot Water System Prices
Compare the current unit price, then open the product to check stock, specifications, delivery and optional parts.
| Rinnai system | Current price | Purchase type | |
|---|---|---|---|
| Rinnai 250L Electric Hot Water System | $949 | Supply only | View |
| Rinnai 125L Electric Hot Water System | $729 | Supply only | View |
| Rinnai 160L Electric Hot Water System | $859 | Supply only | View |
| Rinnai 315L Electric Hot Water System | $1,119 | Supply only | View |
| Rinnai 50L Electric Hot Water System | $499 | Supply only | View |
| Rinnai Infinity B16 LPG Gas Hot Water System | $909 | Supply only | View |
| Rinnai 400L Electric Hot Water System | $1,689 | Supply only | View |
| Rinnai Infinity B26 LPG Gas Hot Water System | $1,069 | Supply only | View |
| Rinnai Infinity B26 Natural Gas Hot Water System | $1,069 | Supply only | View |
| Rinnai Infinity B16 Natural Gas Hot Water System | $909 | Supply only | View |
| Rinnai Infinity B20 LPG Gas Hot Water System | $1,059 | Supply only | View |
| Rinnai Infinity B20 Natural Gas Hot Water System | $1,059 | Supply only | View |
| Rinnai Enviroflo GR-Series 300L Heat Pump Hot Water System | $4,469 | Supply only | View |
| Rinnai Enviroflo GR-Series 280L Heat Pump Hot Water System | $3,409 | Supply only | View |
| Rinnai Enviroflo GR-Series 215L Heat Pump Hot Water System | $2,829 | Supply only | View |
| Rinnai Enviroflo AR-Series 340L Heat Pump Hot Water System | $4,649 | Supply only | View |
| Rinnai Enviroflo AR-Series 300L Heat Pump Hot Water System | $4,299 | Supply only | View |
Product price only. Delivery, valves, fittings, pipework, installation and other extras are separate unless expressly included with the selected product.
Rinnai Warranty & Care
Rinnai warranties are model-specific. Current Hotflo electric models can carry different cylinder coverage depending on capacity, Infinity B products use separate heat-exchanger and component warranty periods, and Enviroflo heat pumps separate cylinder, refrigeration and other component coverage. Always check the warranty for the exact model rather than applying one period to the whole brand.
Electric Storage Anodes
Hotflo electric storage uses an enamel-lined tank and sacrificial-anode protection. Water quality and anode maintenance can affect long-term cylinder condition.
Infinity Heat Exchanger
Infinity continuous-flow warranty commonly treats the heat exchanger separately from other components. Keep the exact model and serial number for warranty and service identification.
Heat Pump Components
Heat pumps combine a cylinder, refrigeration system, controls and electric backup element. Warranty periods can differ between those component groups.
Valves & Safety Components
Storage-system relief and pressure-control valves are safety components and should be maintained or assessed if they leak or operate abnormally.
Common Rinnai Hot Water Problems & Replacement Signs
A Rinnai system not producing hot water does not automatically mean the whole unit has failed. Electric storage can have element, thermostat or supply faults; Infinity systems can show gas, ignition, water-flow or error-code issues; heat pumps add refrigeration, sensor and control faults. Tank leakage from the cylinder itself, severe corrosion, repeated breakdowns or a system that no longer meets household demand are stronger reasons to consider replacement.
No Hot Water
Check whether the property has the expected electricity or gas supply and whether the appliance displays an error. Licensed electrical, gas and refrigeration work should be handled by the appropriate trade.
Infinity Error Codes
Rinnai continuous-flow units can display diagnostic error codes. The code helps identify the fault area but should be interpreted against the correct model documentation.
Hot Water Runs Out
For storage, demand may exceed available capacity or recovery. For heat pumps, operating mode, ambient conditions and recovery time also affect hot-water availability.
Water Around the Tank
Identify whether water is from a relief valve, connection or cylinder. A leaking cylinder is more serious than normal intermittent relief-valve discharge.
Buying a Rinnai Hot Water System Supply Only
Choose the Rinnai system first, then check delivery and add only the valves, pipework, fittings or accessories required for the job. For a replacement, the old model number, system type, fuel type, capacity or flow rate and a clear photo of the existing installation make product matching much easier.
Rinnai Hot Water System Questions
Answers to common Rinnai price, sizing, Infinity, electric storage, heat pump, replacement, delivery and warranty questions.