Instant Electric Hot Water Systems From $1,149
Compare whole-home instantaneous electric systems, compact under-sink storage heaters, local instantaneous units and boiling-water systems.
Find The Right Electric Hot Water System
Start with where the hot water is needed. We’ll keep the different system types separate.
Why homeowners choose JR Gas & Water
Real stories from instant electric hot water system homeowners who’ve experienced fast installs, expert advice, and 5-star service with JR Gas & Water.
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Instant Electric Hot Water Systems Brisbane & Gold Coast
Instant electric hot water systems heat water as it flows through the unit rather than storing a large cylinder of hot water. They provide a compact all-electric option for point-of-use hot water, selected bathrooms and whole-home applications where the electrical supply and expected flow demand are suitable.
JR Gas & Water supplies, replaces and installs electric instantaneous hot water systems throughout Greater Brisbane, the Gold Coast, Logan, Ipswich, Redlands, Moreton Bay and surrounding South East Queensland areas. Compare current instant electric systems and installed pricing above, or use the selector to determine whether your application needs single-phase point-of-use hot water, a higher-output three-phase system, compact under-sink storage or another local hot water solution.
Instant electric hot water is very different from conventional electric storage. There is no large tank to heat and maintain at temperature, but producing hot water instantly requires substantial electrical power. Correctly matching the electrical supply, heater output, water flow and required temperature rise is therefore critical.
Instant Electric, Point-of-Use & Under-Sink Hot Water Explained
Products described broadly as compact or instant electric hot water do not all work the same way. The first step is deciding which type of system the application actually needs.
True Instantaneous Electric
A tankless instantaneous electric water heater heats water as it flows through the unit. There is no meaningful stored reserve of hot water.
This is the correct category for electric continuous-flow bathroom, shower and point-of-use applications.
Under-Sink Storage
Compact under-sink storage units hold a small quantity of heated water close to the outlet. They provide fast local hot water but are not true tankless instantaneous heaters.
Compare under-sink hot water systems →Boiling Water Systems
Boiling-water units are a separate point-of-use category designed for near-boiling drinking or kitchen water rather than normal bathroom hot water.
Compare boiling and chilled systems →How Does Instant Electric Hot Water Work?
A true electric instantaneous water heater detects water flowing through the unit and uses powerful electric heating elements to raise the water temperature before it reaches the outlet. Energy is used while hot water is flowing rather than to maintain a large stored cylinder at temperature.
1. Hot Tap Opens
Water begins flowing through the instantaneous electric heater.
2. Flow Is Detected
Once the required minimum flow is reached, the unit begins heating.
3. Electrical Power Is Applied
High-output electric elements transfer heat directly into the flowing water.
4. Temperature Is Controlled
Electronic systems regulate heating output and, on selected models, water flow to achieve the requested temperature.
5. Hot Water Is Delivered
Heated water travels directly to the shower, basin, sink or other connected outlet.
6. Heating Stops
Once water stops flowing, the unit stops consuming energy for water heating.
Why Electrical Power Matters More Than Tank Size
Instant electric hot water needs to add a large amount of heat to moving water in only a few seconds. That means electrical output, measured in kilowatts, is one of the most important specifications when choosing an electric instantaneous system.
The more water flowing through the heater and the greater the required temperature rise, the more electrical power is needed.
| Electrical Output | Typical Application | General Position |
|---|---|---|
| Approximately 6–10kW | Lower-flow point-of-use applications | Commonly single phase but still requires substantial dedicated electrical capacity |
| Approximately 13–18kW | Higher-flow bathroom and selected multi-outlet applications | Commonly requires three-phase electrical supply |
| Approximately 18–28kW+ | Higher-demand instantaneous electric applications | Three-phase supply and substantial circuit capacity normally required |
Single-Phase vs Three-Phase Instant Electric Hot Water
The available electrical supply is one of the first things to check when considering instantaneous electric hot water. Single-phase systems can work extremely well for lower-flow applications, while higher-output systems commonly rely on three-phase power.
| Comparison | Single Phase | Three Phase |
|---|---|---|
| Typical Use | Point-of-use and lower-flow applications | Bathrooms and higher-demand applications |
| Available Heating Output | Lower | Much higher |
| Whole-Home Potential | Limited | Possible in suitable correctly sized applications |
| Electrical Demand | Still high compared with normal plug-in appliances | High demand spread across three phases |
| Existing Supply | Many properties already have single phase | The property must have or be upgraded to suitable three-phase supply |
Flow Rate & Temperature Rise – The Key to Instant Electric Sizing
Instantaneous electric performance is determined by the relationship between electrical power, water flow and the amount the incoming water needs to be heated.
If the same heater has to raise water by a greater number of degrees, it can heat fewer litres per minute to the required outlet temperature. If the incoming water is warmer or the desired outlet temperature is lower, more flow may be available.
| Condition | What Changes? | Effect |
|---|---|---|
| Higher water flow | More litres must be heated each minute | More electrical power is required for the same temperature rise |
| Colder incoming water | Greater temperature rise is required | Maximum usable flow at the target temperature decreases |
| Warmer incoming water | Smaller temperature rise is required | The same heater can generally support greater flow |
| Higher outlet temperature | More heat must be added | Available flow at the target temperature reduces |
Why Instant Electric Systems Need So Much Power
Heating moving water takes a predictable amount of energy. As a useful guide, the electrical heating power required can be approximated from the water flow and required temperature rise.
Required heating power in kW is approximately:
0.07 × litres per minute × temperature rise in °C
For example, heating approximately 5 litres per minute by 30°C requires roughly 10.5kW of heating power. Increasing the flow to 10 litres per minute at the same temperature rise requires roughly twice as much heating power.
Where Instant Electric Hot Water Works Best
Remote Bathrooms
A local instantaneous system can avoid running a long hot water pipe from a distant central cylinder where the electrical supply is suitable.
Granny Flats & Studios
Compact properties with modest simultaneous demand can be strong candidates for local instantaneous electric hot water.
Secondary Hot Water Areas
Useful where an additional bathroom or isolated part of the property needs independent hot water.
Basins & Sinks
Lower-output single-phase instantaneous heaters can work well where the required flow is modest and the unit is positioned close to the outlet.
Space-Limited Properties
Tankless electric units are compact and can remove the need for a large storage cylinder where the property has sufficient electrical capacity.
Properties Without Gas
Instantaneous electric allows tankless hot water without installing a natural gas or LPG system.
50°C vs 60°C Instantaneous Electric Hot Water
Electric instantaneous systems are available with different temperature capabilities depending on the model and intended application. Selected models are specifically designed to deliver water not exceeding 50°C, while other systems can provide higher outlet temperatures.
50°C Systems
Selected instantaneous electric models are designed around a maximum 50°C hot water output and can suit applications where that temperature configuration matches the plumbing design and relevant requirements.
Up to 60°C Systems
Higher-temperature models can suit applications requiring hotter water, provided the complete installation includes the appropriate temperature control where required.
Instant Electric vs Under-Sink Storage Hot Water
These two categories are often confused because both are compact and can be installed close to the point of use. Their operation is very different.
| Comparison | True Instant Electric | Under-Sink Storage |
|---|---|---|
| Hot Water Storage | No meaningful stored reserve | Small tank stores heated water |
| Heating | Heats water while it flows | Heats and reheats a small stored volume |
| Electrical Demand | Can be very high | Usually much lower |
| Hot Water Limit | Flow and heating capacity | Stored capacity plus recovery |
| Best Application | On-demand point-of-use or selected bathroom applications | Isolated sinks, kitchens and local low-volume demand |
How Much Does an Instant Electric Hot Water System Cost?
Instant electric hot water system cost depends on the heater output, single-phase or three-phase requirements, brand, installation location and the electrical work required at the property.
JR Gas & Water displays current instantaneous electric systems and installed pricing in the product range above. This lets customers compare actual available systems rather than relying on a generic price range.
Current Instant Electric Hot Water Price Range
The live range is calculated from available products in this Instant Electric collection. The advertised starting price and the final supplied-and-installed price are not always the same because electrical and site requirements can change the installation scope.
This gives customers a useful real-time view of the price spread across the current range without creating a second calculator. Use the selector and installation options above for the price that applies to the system and installation pathway you actually choose.
Advertised Price vs Supplied-and-Installed Price
| Price Component | What It Means | Why It Can Change |
|---|---|---|
| Advertised starting price | The starting price shown for the available system or package | Varies by model, output and product configuration |
| Like-for-like replacement | Replacement where suitable electrical and plumbing infrastructure already exists | Usually the simplest installation pathway |
| New circuit / electrical work | Dedicated cabling, protection or switchboard work required for the selected heater | High-output instantaneous systems can require substantial electrical capacity |
| Three-phase requirements | Higher-output systems commonly need suitable three-phase supply | Existing property infrastructure determines whether additional work is required |
| Relocation / new installation | Installing the heater in a new position or adding a new point of use | Cable distance, plumbing, access and wall position can all affect labour and materials |
What Can Change the Installation Price?
- Instantaneous heater size and electrical output.
- Single-phase or three-phase power requirements.
- Whether the property already has three-phase power.
- Existing switchboard capacity.
- Required circuit protection.
- Electrical cable size and cable-run distance.
- Like-for-like replacement versus a new installation.
- Existing hot and cold water pipework.
- Water pressure and flow conditions.
- Installation position and access.
- 50°C or higher-temperature installation requirements.
- Removal of the old hot water system where required.
Which Instant Electric Installation Is Usually the Lowest Cost?
A like-for-like replacement is generally the lowest-cost pathway when the new heater suits the existing electrical supply, circuit capacity, plumbing and installation position. Moving to a substantially higher-output unit can change the job quickly if new cabling, additional circuit protection, switchboard work or three-phase supply is required.
Why Electrical Capacity Matters to the Total Price
Instant electric systems are unusual because the appliance can be physically small while the electrical demand is very large. For this reason, the cheapest heater on the product grid is not automatically the cheapest installed solution. A correctly sized unit that works with the property's existing electrical infrastructure can represent better installed value than a cheaper or more powerful unit that requires major electrical upgrades.
Best Instant Electric Hot Water Systems – JR Installer Picks
The best instantaneous electric system depends heavily on the electrical supply and intended outlets. We separate lower-flow single-phase applications from higher-output three-phase systems rather than trying to rank every unit as though they perform the same job.
Premium High-Output Pick
Stiebel Eltron DHE 27 AU
A premium three-phase instantaneous system for higher-demand applications where precise electronic control, strong output and a compact tankless design are priorities.
View Stiebel Eltron systems →Strong Three-Phase Value
Stiebel Eltron DHB-E Range
Available in multiple outputs, the DHB-E range gives homeowners options for matching three-phase instantaneous electric hot water more closely to the required application.
View DHB-E 13 LCD →Single-Phase Point-of-Use Pick
Stiebel Eltron DHCE
A compact single-phase direction for lower-flow applications where true instantaneous hot water is wanted but a larger three-phase system is unnecessary.
View DHCE 6/50 →Instant Electric Hot Water Brands We Install
Stiebel Eltron
The deepest current range in JR's instantaneous electric category, covering compact single-phase units through to premium high-output three-phase systems.
View Stiebel Eltron systems →Rinnai
Rinnai Efinity provides another compact electric continuous-flow direction for suitable properties with three-phase power.
View Rinnai hot water systems →Rheem
Rheem provides additional electric hot water options for homeowners wanting a recognised Australian hot water brand.
View Rheem hot water systems →Instant Electric Hot Water Installation Brisbane & Gold Coast
JR Gas & Water supplies and installs instantaneous electric hot water systems throughout Brisbane and the Gold Coast. Because electric continuous-flow systems can place a substantial load on the electrical supply, installation needs to consider both plumbing and electrical suitability before the heater is selected.
Electrical Supply
Confirm the property's phase configuration, switchboard capacity, circuit requirements and whether the selected instantaneous heater can be supported.
Water Flow & Pressure
The property must provide appropriate water flow and pressure for the selected heater and intended outlets.
Hot Water Demand
Shower flow, simultaneous outlets and target water temperature are considered before deciding how much electrical output is required.
Installation Position
Positioning the heater closer to the point of use can reduce the amount of water sitting in long hot water pipe runs and reduce waiting time at the outlet.
Instant Electric Hot Water Brisbane & Gold Coast
Instant Electric Hot Water Brisbane
JR Gas & Water installs electric instantaneous hot water systems throughout Greater Brisbane, including Brisbane City, Brisbane North, Brisbane South, Logan, Ipswich, Redlands and surrounding service areas.
Brisbane properties range from compact apartments and secondary bathrooms through to homes already equipped with three-phase power. The right system depends on whether the application is a local sink, bathroom, secondary dwelling or higher-demand installation.
View hot water installation in Brisbane →Instant Electric Hot Water Gold Coast
JR Gas & Water supplies and installs electric continuous-flow hot water systems throughout the Gold Coast for suitable residential and point-of-use applications.
Before recommending an instant electric system, we consider expected hot water flow, existing electrical supply, switchboard capacity and whether another technology may provide a better whole-home result.
View hot water installation on the Gold Coast →Instant Electric vs Electric Storage Hot Water
| Comparison | Instant Electric | Electric Storage |
|---|---|---|
| Storage Tank | No large storage tank | Stores heated water |
| Heating | Only while water is flowing | Heats stored water and reheats as required |
| Electrical Demand | Very high while operating | Much lower instantaneous electrical load |
| Space | Very compact | Requires room for a storage cylinder |
| Off-Peak Heating | Not normally the same strategy | Can suit controlled-load tariffs |
| Best For | Point-of-use and suitable tankless applications | Broad whole-home residential demand |
Instant Electric vs Instant Gas Hot Water
| Comparison | Instant Electric | Instant Gas |
|---|---|---|
| Energy Source | Electricity | Natural gas or LPG |
| Storage Tank | No | No |
| High Flow Requirement | Requires substantial electrical capacity | Requires substantial gas capacity |
| Three-Phase Power | Commonly required for higher-output systems | Not required for heating |
| Gas Supply | Not required | Required |
| Best For | All-electric properties with suitable electrical infrastructure | Properties with suitable gas supply requiring strong continuous flow |
Instant Electric vs Heat Pump Hot Water
Instant electric and heat pumps are both all-electric hot water technologies, but they solve completely different problems. Instant electric removes the storage tank and uses substantial electrical power only while hot water flows. A heat pump uses much less electrical input but stores hot water in a cylinder.
| Comparison | Instant Electric | Heat Pump |
|---|---|---|
| Storage | Tankless | Stored hot water |
| Electrical Demand | Very high while heating | Much lower input spread over a longer heating period |
| Physical Size | Very compact | Large storage cylinder and heat-pump section |
| Operating Noise | Virtually silent | Fan and compressor noise |
| Best For | Compact targeted on-demand applications | Whole-home energy-efficient stored hot water |
How an Instant Electric Hot Water Installation Works
1. Confirm the Application
Establish which outlets the system needs to supply and the expected simultaneous hot water demand.
2. Check Electrical Capacity
Confirm single or three phase, available capacity, switchboard suitability and the circuit requirements of the selected unit.
3. Size the Heater
Match electrical output to expected water flow and temperature rise.
4. Install the Unit
Position the heater and complete the required plumbing and dedicated electrical connections.
5. Test Flow & Temperature
Confirm the unit activates correctly and provides suitable outlet performance.
6. Commission the System
Final electrical, plumbing and operating checks are completed before handover.
What We Have Learned Installing Instant Electric Hot Water
Check the Power Before Choosing the Heater
The biggest mistake is choosing the product first and discovering afterwards that the electrical supply cannot support it economically.
Single Phase Does Not Mean Plug-In
Single-phase instantaneous systems can still draw very high current and commonly require dedicated hardwired electrical circuits.
Flow and Temperature Rise Belong Together
A flow-rate figure without the corresponding temperature rise tells only part of the performance story.
Point-of-Use Is Often Its Sweet Spot
Instant electric is particularly strong where a known local hot water demand can be served without heating a large storage tank or running a long hot water pipe.
Three Phase Can Change the Equation
Properties already equipped with suitable three-phase power have far more options for higher-output electric instantaneous hot water.
Tankless Does Not Automatically Mean Lower Bills
Removing storage losses is useful, but running cost still depends on how much hot water is used, electricity tariffs and the efficiency of alternative systems being compared.
Instant Electric Hot Water System FAQs
What is an instant electric hot water system?
A true instant electric hot water system heats water as it flows through the heater rather than storing a large volume of hot water. It is also commonly called an electric instantaneous, electric continuous-flow or tankless electric water heater.
Is instant electric the same as continuous flow electric hot water?
Yes. Instantaneous electric and electric continuous flow generally describe the same tankless heating principle: water is heated as it flows through the system rather than stored in a large cylinder.
Can instant electric hot water run a shower?
Yes, selected instantaneous electric systems can supply showers, provided the heater has enough electrical output for the required water flow and temperature rise. Higher-flow shower and bathroom applications often require three-phase systems.
Can instant electric hot water run a whole house?
Some high-output three-phase instantaneous electric systems can supply multiple outlets in suitable homes, but whole-house suitability depends on simultaneous demand, electrical capacity, water flow and required temperature rise. It should not be assumed that every tankless electric heater can supply a family home.
Does instant electric hot water need three-phase power?
Not every system does. Lower-output point-of-use units are available in single-phase versions. Higher-output systems intended for bathrooms or greater flow commonly require three-phase electricity.
Can instant electric hot water plug into a normal power point?
True instantaneous electric water heaters generally have much higher electrical demand than a standard 10 amp power point can provide. Even single-phase models commonly require a dedicated hardwired electrical circuit. Always check the exact model requirements.
How much power does an instant electric water heater use?
Output varies greatly by model. Compact point-of-use systems may be around 6–10kW, while higher-output three-phase systems can exceed 20kW. They use high power while heating but do not maintain a large stored tank between hot water uses.
Why does incoming water temperature matter?
The colder the incoming water, the more heat the unit must add to reach the desired outlet temperature. At a fixed electrical output, a greater required temperature rise generally means less water can be heated per minute to the target temperature.
Is under-sink hot water the same as instant electric?
Not always. Some under-sink systems are true instantaneous heaters, while many compact under-sink systems store 5L, 10L or 15L of hot water close to the outlet. Both provide local hot water, but they operate differently.
Is instant electric cheaper to run than electric storage?
Instant electric avoids the standby heat losses associated with maintaining a large cylinder of hot water, but total running cost depends on hot water usage and electricity tariffs. Electric storage may also have access to favourable controlled-load tariffs, so instant electric is not automatically cheaper for every property.
Is instant electric better than a heat pump?
They suit different applications. Instant electric is compact and tankless but requires high electrical power while heating. A heat pump uses a storage tank but generally needs substantially less electrical energy to produce the same amount of hot water. For normal whole-home family demand, a heat pump should usually be compared if energy efficiency is the main objective.
How much does instant electric hot water cost installed?
Installed cost depends heavily on the system output and electrical requirements. A like-for-like replacement with suitable existing electrical infrastructure can be much simpler than a new high-output installation requiring switchboard, cabling or three-phase upgrades. Current JR installed prices are shown in the product range above.
What is the best instant electric hot water system?
The best system is the one correctly matched to the electrical supply, required water flow and temperature rise. JR's current range is led by Stiebel Eltron across single-phase and three-phase applications, with Rinnai and Rheem providing additional options.
Do you install instant electric hot water in Brisbane and Gold Coast?
Yes. JR Gas & Water supplies and installs electric instantaneous hot water systems throughout Greater Brisbane, the Gold Coast, Logan, Ipswich, Redlands, Moreton Bay and surrounding South East Queensland service areas.
What is the cheapest way to replace an instant electric hot water system?
A suitable like-for-like replacement is generally the simplest and lowest-cost pathway because it can reuse compatible electrical and plumbing infrastructure. The exact result still depends on the selected heater and the condition and capacity of the existing installation.
Why can a cheap instant electric heater cost more to install?
The appliance price is only one part of the job. A higher-output heater may require larger electrical cabling, dedicated circuit protection, switchboard work or suitable three-phase supply. These requirements can make a lower-priced unit more expensive overall than a system that better matches the property's existing infrastructure.
Does three-phase power affect instant electric hot water installation cost?
Yes. Higher-output instantaneous electric systems commonly require three-phase power. If suitable three-phase supply and circuit capacity already exist, installation can be more straightforward. If the property requires significant electrical upgrades, the total installed cost can increase substantially.
Is the instant electric price shown online the final installed price?
The collection shows current advertised pricing and the selector provides the relevant installation pathway. Final cost depends on the exact system and property requirements, particularly electrical capacity, circuit distance, switchboard condition, plumbing and installation position.
Compare Instant Electric Hot Water Options
Compare true instantaneous electric hot water with related point-of-use and whole-home hot water options before choosing the best system for your property.
Choose Your Instant Electric Hot Water System
Compare instantaneous electric hot water systems, electrical output and current installed pricing above. Current advertised starting-price range: checking current prices…. If you are unsure whether your property has suitable single-phase or three-phase capacity, what flow rate you require, or whether instant electric is the best option for your application, book an onsite quote assessment before choosing the system.
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