Solar to Electric Hot Water
Solar Hot Water to Electric: Is It Worth Switching?
Electric storage is simpler and cheaper upfront — but make sure moving away from solar does not create a bigger long-term electricity bill than necessary.
Replacing solar hot water with conventional electric storage can simplify an ageing system and move the active hot-water equipment to an easy-to-service ground-level tank. The conversion can involve roof equipment, booster circuits, new electrical load, tank positioning and plumbing changes. If the property is already moving away from solar thermal, it is also worth comparing heat pump before committing to resistance electric for the next decade.
Is Standard Electric the Right Replacement?
Start with your current solar layout. Roof-mounted and split systems can have very different conversion scopes.
1 What solar hot-water setup do you have?
2 What does the home have now?
3 What matters most?
Guide only. Existing solar layout, roof access, booster type, electrical infrastructure, tank position, household demand and the selected replacement all need to be checked.
Can You Replace Solar Hot Water With Standard Electric Storage?
Yes. Both roof-mounted and split solar-hot-water systems can be replaced with conventional electric storage. The key difference is that the new electric system receives all of its heat from an electrical resistance element instead of using solar thermal energy from roof collectors, so electrical capacity, operating strategy and long-term electricity use become much more important.
Solar Equipment
The old collectors, roof tank, circulation components and booster arrangement need to be identified and decommissioned as required.
Tank Position
A split solar system may already have a useful ground-level tank position. A close-coupled roof system generally needs a new ground-level cylinder location.
Electrical Supply
Existing booster wiring can be useful infrastructure, but it should not automatically be assumed suitable for the selected electric tank and element.
Running Energy
Once the solar-thermal contribution disappears, the resistance element needs to supply the heat whenever the tank requires reheating.
The Conversion Depends on What Type of Solar Hot Water You Have
Tank & Collectors on the Roof
A close-coupled solar system stores water on the roof. Moving to standard electric storage generally means creating a new ground-level tank position and connecting the household hot and cold services to it.
The old roof tank, collectors, brackets, pipework and roof penetrations also need to be considered in the decommissioning or removal scope.
Ground Tank + Roof Collectors
A split system can be easier because there is already a storage cylinder and water services at ground level.
The existing tank position may suit the replacement electric system, while the roof collectors, circulation pipework and solar controls are decommissioned separately.
Why Change From Solar Hot Water to Standard Electric?
Solar hot water can be very efficient, but an ageing system can eventually involve roof collectors, pumps, valves, tanks and booster components all requiring attention. Standard electric storage removes much of that complexity.
Lower Replacement Cost
A conventional electric cylinder can have a significantly lower initial purchase price than installing another complete solar-thermal system.
Ground-Level Simplicity
The working hot-water appliance can be kept at ground level without relying on dedicated solar collectors, circulation pumps or a roof-mounted storage cylinder.
Silent Operation
Standard electric storage has no compressor or fan and operates almost silently during normal heating.
Solar, Electric & Heat Pump: Current JR Starting Prices
The lowest installation price and the lowest long-term ownership cost are different questions. These cards read JR's current advertised collection starting prices when the page loads.
Keeps dedicated solar-thermal water heating, but installation can involve collectors, roof access and a more complex system layout.
Current JR advertised starting price. Final scope depends heavily on roof layout and solar configuration.
Usually the simplest lower-cost storage pathway, but resistance heating requires substantially more electricity than a heat pump.
Current JR advertised starting price. Final price depends on tank size, circuit work and installation position.
Moves the system to ground-level efficient electric hot water while retaining much lower electrical energy use than conventional resistance storage.
Current JR advertised starting price. Eligible installations may also qualify for the applicable JR upfront STC pathway.
Solar Hot Water vs Standard Electric Storage
| Consideration | Solar Hot Water | Electric Storage |
|---|---|---|
| Primary heat source | Solar thermal energy plus booster as required | Electrical resistance element |
| Roof equipment | Collectors and sometimes the tank | No dedicated solar-thermal roof equipment |
| System complexity | Collectors, circulation or thermosiphon system and booster | Relatively simple storage cylinder and element |
| Electricity use | Depends heavily on available solar contribution and booster use | Element supplies the heating energy |
| Rooftop solar PV | Separate from the solar-thermal system | Can be timed or controlled to use PV electricity |
| Noise | Generally quiet; split systems may use circulation equipment | Very quiet |
| Roof servicing | Roof equipment may require future access | Main hot-water equipment remains ground level |
| Common reason to change | Retain solar-thermal efficiency | Simplicity, lower upfront cost and no solar-thermal roof equipment |
What Happens to the Old Solar Collectors and Roof Tank?
Changing to electric storage does not automatically make the old solar equipment disappear. The finished scope should clearly identify what is being decommissioned, what is being removed and what roof work is required.
Roof-Mounted Tank
Close-coupled systems can involve substantial weight on the roof. Safe removal depends on access, roof pitch, system size and the existing equipment condition.
Solar Collectors
Collectors that are no longer serving the hot-water system need to be considered as part of the decommissioning or removal plan.
Pipework & Penetrations
Roof brackets, solar flow-and-return pipework and roof penetrations may also require attention when old equipment is permanently removed.
Can the Existing Solar Booster Circuit Power the New Electric Tank?
Potentially, but it should never be assumed. The existing solar system may already have electrical infrastructure for a booster, pump or controller, but the new electric storage tank needs a circuit and protection arrangement suitable for its actual heating element.
Existing Infrastructure May Help
An electric booster means some hot-water electrical infrastructure already exists.
Cable size, protection, tariff control, element rating and the new tank position still need to be checked before reuse.
Gas Out, New Electrical Load In
Where the old solar system uses a gas booster, the hot-water gas connection needs to be appropriately dealt with and the new electric system needs suitable electrical infrastructure.
This makes heat pump particularly worth comparing because electrical work is being introduced either way.
If You Choose Electric, a Timer or Catch Power Can Make It Smarter
Conventional electric storage does not have to operate blindly. Where the property has rooftop solar PV, suitable timing or load-sensitive control can help move more water heating into periods when household-generated electricity is available.
Heat During a Chosen Window
A suitable timer can shift water heating into daytime solar production, a cheaper tariff period or another preferred electricity window.
Better Match to Available Solar
Suitable solar-control equipment can help coordinate the hot-water load with available PV generation rather than relying on a fixed time alone.
Rooftop Solar Helps Electric Storage — Until Solar Production Falls
Standard electric can look very attractive on a bright Queensland day when the house has plenty of surplus PV. The long-term difference appears when the element needs more power than the solar system is producing.
Strong Solar Day
Smart control can direct a large amount of water heating into the household's high-production solar window.
Cloudy or Rainy Day
When solar output drops below the resistance element's demand, the balance needs to come from the grid or another available household energy source.
Solar + Battery
If the battery is configured to supply the hot-water circuit, a large resistance load can consume stored battery capacity quickly.
A heat pump can also be scheduled into solar-production hours, but its lower electrical demand means the same hot-water task generally places less pressure on the solar array, battery and grid.
If You Are Leaving Solar Thermal, Compare Heat Pump Before Standard Electric
This is the key comparison on an ageing solar-hot-water replacement. Both technologies can remove the old solar-thermal roof system and place the active hot-water equipment at ground level. The main long-term difference is how much electricity they need.
Both Can Simplify the Roof
Neither conventional electric nor heat pump requires dedicated solar-thermal collectors to provide normal hot-water operation.
Both Use Electricity
Once solar thermal is removed, either pathway depends on electricity. The difference is how efficiently that electricity is turned into useful water heating.
Heat Pump Uses Much Less
Heat pumps transfer environmental heat into the water rather than producing all of the heat directly through resistance heating.
When Solar Hot Water to Standard Electric Can Make Sense
There are real situations where conventional electric storage is the practical choice rather than trying to force another renewable system into the property.
Lowest Upfront Cost Is Critical
A standard electric cylinder can be one of the least expensive ways to replace an ageing solar-hot-water system.
Location Is Noise Sensitive
Conventional electric storage has no compressor or fan and can suit locations beside bedrooms or close to neighbours.
Heat-Pump Airflow Is Not Practical
An enclosed or restricted location can sometimes accommodate standard electric storage where a heat pump would require relocation.
When Heat Pump Is Usually the Better Step Away From Solar Thermal
If the reason for leaving solar hot water is ageing roof equipment rather than a desire to increase electricity use, heat pump is usually worth serious consideration.
Rooftop Solar PV
A heat pump can use PV electricity during daylight hours without needing the very large electrical input of a resistance element.
Solar + Battery
Lower electrical demand can help preserve more stored battery capacity for evening household loads.
Family Hot-Water Demand
Higher household hot-water use increases the importance of how efficiently the replacement technology heats every litre.
Split Solar Already Has a Ground Tank
The existing storage location can sometimes provide a practical starting point for the new heat-pump installation.
Long Ownership Period
The purchase price is paid once. Electricity consumption continues year after year.
Eligible STC Pathway
Eligible heat-pump installations can receive renewable-energy incentives that conventional resistance electric storage does not receive.
How a Solar-to-Electric Conversion Works
Identify the Solar System
Confirm whether it is close-coupled or split, the tank location, booster type, collectors and circulation arrangement.
Compare Electric & Heat Pump
Decide whether lowest upfront price, silence or lower long-term electricity consumption matters most.
Confirm Roof Scope
Determine what roof tank, collectors, brackets and pipework are being decommissioned or removed.
Choose the Ground Tank Position
Confirm space, base, plumbing, drainage, service access and electrical routing.
Complete Electrical & Plumbing Work
Install the required circuit, tank, valves, water connections and drainage for the selected system.
Add Smart Control if Useful
If standard electric is selected, suitable timer, tariff or solar-control options can improve when the element consumes power.
Solar Hot Water to Electric FAQs
Can I replace solar hot water with a normal electric hot-water system?
Yes. Both close-coupled and split solar-hot-water systems can be replaced with conventional electric storage. Roof equipment, booster type, tank position, electrical supply and plumbing all need to be considered.
Is changing from solar hot water to electric a good idea?
It can make sense when low upfront cost, silent operation or a simpler ground-level system is the priority. If the property suits a heat pump and long-term electricity consumption matters, heat pump should normally be compared before moving from solar thermal to resistance electric.
What happens to the old solar collectors?
The old solar-thermal collectors need to be dealt with as part of the agreed decommissioning or removal scope. Roof access, brackets, pipework, penetrations and the condition of the existing equipment can affect the work required.
What happens to a solar tank mounted on the roof?
A roof-mounted close-coupled tank needs to be decommissioned when the system is replaced. If physical removal is included, roof access, weight, lifting requirements, collectors and associated pipework all affect the final scope.
Can the electric tank go where my split-solar tank is now?
Often. An existing ground-level split-solar tank position can provide a practical starting point if the base, access, plumbing, drainage and electrical requirements also suit the new electric tank.
Can I use the existing solar-booster electrical circuit?
Potentially, but it should not be assumed. Cable size, protection, tariff control, booster arrangement, element rating and the new tank requirements all need to be checked.
Can I use rooftop solar PV to run electric hot water?
Yes. Conventional electric storage can be timed or controlled so that more water heating occurs during solar-production hours. The benefit depends on solar output, element demand, household loads and the electricity control arrangement.
Should I put a timer on electric hot water?
A suitable timer can help shift heating into a chosen solar-production, off-peak or lower-cost period. The control window still needs to allow enough heating to meet household demand.
Can Catch Power be used with electric hot water?
Suitable Catch Power or other solar-control products can form part of an electric hot-water setup designed to align heating more closely with rooftop PV production. Electrical and product compatibility need to be checked for the property.
Does Catch Power make electric storage as efficient as a heat pump?
No. Smart control improves when a resistance element consumes electricity. It does not change the underlying resistance-heating process. A heat pump reduces electrical demand by transferring heat from the surrounding air.
What happens to electric hot water on rainy or cloudy days?
If rooftop solar generation is lower than the resistance element's power requirement, the shortfall needs to come from another available source such as the electricity grid or, depending on the home's configuration, battery storage.
Can electric hot water drain my solar battery?
It can consume substantial stored battery energy if the battery is configured to supply the hot-water circuit. Appropriate control settings can reduce unwanted battery discharge.
Is heat pump better than electric when replacing solar hot water?
Where both technologies suit the property, standard electric generally offers lower initial cost, quiet operation and simplicity, while heat pump generally offers substantially lower electricity consumption and a stronger long-term efficiency pathway after leaving solar thermal.
Should I just replace my old solar system with another solar system?
That can still make sense where the roof, collector position and solar-thermal layout remain suitable. The best comparison is between the complete cost and practical benefits of replacement solar, conventional electric and heat pump rather than assuming one technology suits every property.
Leaving Solar Hot Water? Compare Both Ground-Level Electric Options
Standard electric storage can be simple, silent and relatively affordable. If you are already removing an ageing solar-thermal system, compare a heat pump as well — especially if the home has rooftop solar PV, a battery, family-sized hot-water demand or a suitable outdoor tank position.