Electric to Solar Hot Water
Electric to Solar Hot Water: Is It Worth Upgrading?
Solar hot water can dramatically reduce how much purchased energy heats your water — but your roof, tank layout and alternative heat-pump pathway all matter.
Replacing conventional electric storage with solar hot water can move a large part of your water heating from a resistance element to direct solar thermal energy. The conversion can involve roof collectors, solar pipework, a booster and either a ground-level or roof-mounted tank. Before deciding, compare heat pump as well: an electric-storage home often already has the tank position, plumbing, drainage and electrical infrastructure needed for a simpler high-efficiency upgrade.
Does Solar Suit Your Electric Upgrade?
Your existing tank position and roof conditions usually tell us a lot about whether solar or heat pump is the more natural upgrade.
1 Where is the current electric tank?
2 What is the roof like?
3 What matters most?
Guide only. Roof orientation, shading, structure, access, tank position, electrical supply, booster arrangement, household demand and exact installation scope need to be checked before finalising the upgrade.
Can You Replace Electric Hot Water With Solar Hot Water?
Yes. Conventional electric storage can be replaced with either split or close-coupled solar hot water where the property has suitable roof conditions. Instead of relying on an electric resistance element for the majority of water heating, the new system uses roof-mounted solar collectors and a storage tank, with a booster supporting the system when available solar contribution is not enough.
Roof Collectors
Solar thermal collectors need usable roof area with suitable exposure, access and installation conditions.
Storage Tank
Split solar keeps the tank at ground level while close-coupled solar places the tank and collectors together on the roof.
Booster
Backup heating supports the household during periods when available solar energy does not meet the required hot-water demand.
Existing Electric Services
The current tank position, plumbing and electrical infrastructure can potentially support the solar conversion — or make heat pump a particularly straightforward alternative.
Why Change From Electric Storage to Solar Hot Water?
Conventional electric storage is simple and dependable, but its element needs purchased electricity whenever the tank requires heating. Solar hot water shifts a large portion of that heating task to energy collected directly from the sun when conditions allow.
Reduce Grid Energy for Hot Water
Strong solar contribution can substantially reduce how often backup heating needs to provide the full water-heating load.
Directly Use Sunshine
Solar thermal collectors convert sunlight directly into useful heat for the water-heating system.
Retain Quiet Operation
Solar hot water avoids the compressor and outdoor fan used by heat pumps, which can matter where the installation area is particularly noise sensitive.
Split Solar or Close-Coupled Solar After Electric Storage?
Your existing electric-tank position can influence which solar layout is most practical.
Ground Tank + Roof Collectors
Split solar keeps the storage cylinder at ground level while the solar collectors sit on the roof.
If your existing electric tank is already in a suitable outdoor position, that area can potentially provide a practical starting point for the replacement solar cylinder.
Solar flow-and-return pipework connects the collector area to the storage system.
Tank + Collectors on the Roof
A close-coupled system places both the storage cylinder and collector assembly on the roof.
This can free the ground-level area occupied by the electric tank, but the roof needs to be suitable for the combined weight, access and mounting requirements.
Close-coupled solar can be especially attractive where ground space is valuable and the roof conditions are strong.
Electric, Solar & Heat Pump: Current JR Starting Prices
Compare the complete installed pathways rather than the tank price alone. These cards read JR's current advertised collection starting prices when the page loads.
Generally the simplest lower-entry-cost pathway where the existing tank position and electrical arrangement remain suitable.
Current JR advertised starting price. Final price depends on tank size, electrical configuration and installation scope.
Adds dedicated solar-thermal collectors and can substantially reduce purchased water-heating energy when the roof and system are well matched.
Eligible solar systems may qualify for JR's current upfront STC pathway.
Retains a ground-level storage system while using much less electricity than conventional resistance heating.
Eligible heat pumps may also qualify for JR's current upfront STC pathway.
Electric vs Solar vs Heat Pump Hot Water
| Consideration | Electric Storage | Solar Hot Water | Heat Pump |
|---|---|---|---|
| Main heat source | Electric resistance element | Solar thermal collectors + booster | Heat from surrounding air + electricity |
| Storage tank | Yes | Yes | Yes |
| Roof equipment | None required | Dedicated solar collectors required | No dedicated solar-thermal collectors required |
| Purchased energy direction | High resistance-heating demand | Low when solar contribution is strong | Low because heat is transferred rather than created entirely by resistance heating |
| Noise | Very quiet | No heat-pump compressor; split systems may use circulation equipment | Compressor and fan operate while heating |
| Rooftop solar PV | Can use PV electricity | Uses separate thermal collectors | Can use PV electricity with much lower electrical demand than conventional storage |
| STC pathway | Not applicable simply for installing standard electric storage | Eligible listed systems may qualify | Eligible listed systems may qualify |
| Strongest reason to choose | Simplicity and lower entry cost | Direct solar heating and quiet renewable hot water | Efficient ground-level upgrade and PV compatibility |
Your Roof Matters Much More With Solar Hot Water
Standard electric storage does not care whether the roof receives strong sun. Solar thermal does. Before choosing the technology, the collector position needs to make practical sense.
Usable Collector Area
Enough clear roof area needs to be available for the selected collector configuration without creating impractical conflicts with other roof equipment.
Sun Exposure
Collector orientation and available sunlight influence how much useful solar heat the system can capture through the year.
Shading
Trees, neighbouring buildings and roof structures can reduce collector performance when they shade the usable solar area.
Roof Access
Height, pitch, roofing material and access can affect both installation complexity and future serviceability.
Roof Loading
Close-coupled systems place stored water on the roof as well as collectors, making roof suitability especially important.
Existing Solar PV
A roof already heavily occupied by productive PV panels may have limited collector space remaining or create a strategic choice about how that roof area is best used.
Can the Existing Electric Hot-Water Circuit Be Used for the Solar Booster?
Potentially, but it should be checked rather than assumed. Your existing electric storage system already has electrical infrastructure for water heating, which can be useful when converting to an electrically boosted solar system.
Existing Circuit
Cable size, protection, switching and tariff arrangements need to suit the booster requirements of the selected solar system.
Booster Element
The booster provides backup heating when available solar energy alone does not meet the household's hot-water requirements.
Existing Infrastructure Helps Heat Pump Too
The same fact that makes solar boosting easier can also strengthen the heat-pump pathway: the property already has electrical hot-water infrastructure in place.
Already Have Solar PV? Compare Solar Thermal With Heat Pump Carefully
Solar PV and solar hot water both use the sun, but they are completely different technologies. Solar thermal needs dedicated collectors. A heat pump can use electricity already produced by the PV array you own.
Solar Thermal
Dedicated collectors capture heat directly for the water-heating system.
PV + Heat Pump
A heat pump can be scheduled into daylight hours and use electricity generated by the home's existing PV panels.
Roof Space Matters
Solar-thermal collectors occupy roof area separately from PV panels, so the best use of available roof space should be considered as part of the upgrade.
If you already have substantial solar PV and a suitable outdoor electric-tank position, heat pump becomes particularly compelling: it can use your existing solar-generation system rather than requiring a second dedicated solar technology on the roof.
Solar or Heat Pump: Which Is the Better Upgrade From Electric?
Both are substantial efficiency upgrades from conventional electric storage. The stronger option depends more on the property than on a simple technology ranking.
The Roof Is Excellent and Quiet Operation Matters
Solar deserves serious consideration where the property has excellent collector exposure, straightforward roof access and the homeowner specifically wants direct solar thermal heating.
It can also be particularly attractive where compressor noise is unacceptable and the customer still wants a high-efficiency system.
The Existing Tank Site Is Already Ideal
If the current electric tank is outdoors at ground level with good airflow, drainage and access, much of the basic heat-pump installation requirement may already be solved.
It becomes even stronger where rooftop PV already exists or useful solar-thermal roof area is limited.
Can Electric-to-Solar Hot Water Qualify for STCs?
Eligible listed solar hot-water systems can create Small-scale Technology Certificates when the exact system and completed installation meet the current scheme requirements. Eligible air-source heat pumps have their own pathway under the same scheme.
Eligible Solar Systems Can Qualify
The exact solar-water-heater model and approved configuration need to satisfy the current eligibility requirements for the installation date and location.
Eligible Heat Pumps Can Also Qualify
Heat pumps are not disadvantaged in this comparison simply because solar sounds more renewable. Eligible listed air-source heat pumps can also receive STCs when their installation qualifies.
When Electric to Solar Hot Water Can Genuinely Make Sense
Solar can be an excellent upgrade where the home's physical layout and the customer's priorities line up with what solar thermal does best.
Excellent Sunny Roof
Strong, relatively unobstructed collector exposure gives the system the opportunity to obtain substantial useful heating directly from sunlight.
Quiet Operation Matters
Solar avoids the compressor and outdoor fan used by heat pumps while still providing a pathway away from conventional resistance heating.
Direct Solar Heating Is Preferred
Some homeowners specifically want dedicated solar thermal rather than an electrically powered refrigeration-cycle appliance.
Ground Space Is Valuable
Where the roof is suitable, a close-coupled solar system can move the tank off the ground and reclaim the space occupied by the old electric cylinder.
Long-Term Energy Reduction Matters
A well-matched solar system can significantly reduce the amount of purchased energy required for hot-water production over time.
Roof Access Is Straightforward
Good access and a suitable roof layout can make the additional solar installation work much more practical.
When Heat Pump Is Usually the Stronger Upgrade From Electric
Solar does not need to lose for heat pump to make more sense. Often the property simply already provides everything a heat pump needs without the additional roof-based installation.
Existing Electric Tank Is Outside
A suitable outdoor ground-level tank site can already provide the space, water services, base and drainage needed for the new heat-pump installation.
Rooftop PV Already Exists
Heat pump can use electricity from the solar system already on the roof without requiring a separate thermal collector installation.
Roof Is Shaded
Heat pump efficiency does not rely on dedicated sunny collector roof area in the same way solar thermal performance does.
Roof Space Is Limited
Keeping the hot-water system at ground level can preserve valuable roof area for existing or future PV generation.
Lower Installation Complexity Matters
Heat pump can avoid collector mounting, dedicated solar pipework and some of the roof-access work associated with solar thermal.
Lower Purchased Energy Is the Main Goal
Heat pump directly replaces high-demand resistance heating with a much lower-energy heating process while retaining a familiar ground-level storage layout.
When Staying With Standard Electric Can Still Make Sense
Not every failed electric tank needs to become a renewable-system conversion immediately. Standard electric still has practical advantages in some circumstances.
Lowest Upfront Cost Is Critical
Conventional electric storage can provide the lower-entry-cost replacement when immediate budget is the overriding priority.
The Tank Is in an Enclosed Position
Some existing indoor or restricted locations may suit another electric cylinder more readily than either heat pump or solar conversion without relocation.
Short Ownership Period
Where long-term energy savings are unlikely to be realised by the current owner, the larger conversion cost may carry less weight than a straightforward replacement.
How an Electric-to-Solar Conversion Works
Compare Solar & Heat Pump
Start by deciding whether the roof-based solar pathway or ground-level heat-pump pathway better suits the property and your priorities.
Assess the Roof
Check usable collector area, sun exposure, shading, access, roof type and any conflicts with existing PV or other equipment.
Choose Split or Close Coupled
Decide whether the new storage tank stays at ground level or moves onto the roof with the collector array.
Size the System
Match tank capacity and collector configuration to occupants, bathrooms, normal hot-water use and expected solar contribution.
Remove the Electric Tank
The old cylinder is isolated, drained and removed, with its electrical and plumbing services adapted to the new system.
Install & Commission Solar
Install the collectors, tank, valves, solar pipework, booster and controls, then test and commission the completed hot-water system.
Electric to Solar Hot Water FAQs
Can I replace an electric hot-water system with solar hot water?
Yes. Conventional electric storage can be replaced with either split or close-coupled solar hot water where the roof, tank position, household demand and installation conditions suit the selected system.
Is changing from electric hot water to solar worth it?
It can be an excellent upgrade where the property has suitable collector exposure and the customer wants to reduce purchased energy for hot-water heating. Heat pump should also be compared because many electric-storage properties already have a suitable ground-level tank position and electrical infrastructure.
Is solar hot water cheaper to run than electric storage?
A well-performing solar system can use substantial solar thermal energy instead of relying entirely on a resistance element. Actual purchased-energy use still depends on solar exposure, household demand, tank sizing, booster operation and seasonal conditions.
Should I choose split solar or roof-mounted solar?
Split solar keeps the tank at ground level and can make good use of an existing electric-tank position. Close-coupled solar places the tank and collectors on the roof and can free ground space. Roof suitability, access and household needs determine which arrangement is more practical.
Can a split solar tank go where my electric tank is now?
Often it can provide a useful starting point. The existing base, hot and cold services, drainage, available space and solar pipe route still need to suit the selected split-solar system.
Can I put the new solar hot-water tank on the roof?
A suitable close-coupled solar system can place the storage tank and collectors together on the roof. Roof structure, access, pitch, roofing material and the selected system need to be assessed first.
Can my existing electric circuit be used for the solar booster?
Potentially. The existing circuit can be useful infrastructure, but cable size, protection, switching, tariff arrangement and the requirements of the selected solar booster need to be checked before reuse.
Does solar hot water still need electricity?
Many solar systems use an electric booster and some split systems also use electrical controls or circulation equipment. The exact electricity requirements depend on the selected solar configuration.
What happens on cloudy or rainy days?
Solar contribution can fall during poor solar conditions. The system's backup heating arrangement is designed to support hot-water demand when solar energy alone is insufficient.
Is solar hot water the same as solar panels for electricity?
No. Solar hot-water collectors capture thermal energy specifically to heat water. Solar PV panels generate electricity that can be used by household electrical loads, including an electric or heat-pump hot-water system.
What if I already have rooftop solar PV?
Existing PV can make heat pump particularly worth comparing because a heat pump can use electricity already generated by those panels without requiring a separate solar-thermal collector array. Available roof space and future PV plans should be considered.
Is heat pump or solar better when replacing electric hot water?
Both can substantially reduce purchased energy compared with conventional electric storage. Solar can be particularly attractive on an excellent roof where quiet direct solar heating is desired. Heat pump can be stronger where the existing outdoor tank site is suitable, rooftop PV already exists, roof space is limited or a simpler ground-level conversion is preferred.
Do solar hot-water systems qualify for STCs?
Eligible listed solar water heaters can qualify for Small-scale Technology Certificates when the exact system and completed installation meet current scheme requirements.
Do heat pumps qualify for STCs too?
Yes. Eligible listed air-source heat pumps can also qualify for Small-scale Technology Certificates when the exact system and installation meet current scheme requirements.
Does JR's $1,000 upfront STC discount apply to solar hot water?
JR's current policy applies its $1,000 including GST upfront STC discount to eligible solar-hot-water and heat-pump systems supplied and installed by JR, subject to final STC eligibility and assignment requirements.
Moving From Electric to Renewable Hot Water? Compare Solar & Heat Pump
Solar hot water can be an excellent upgrade where the roof has strong exposure and you want direct solar thermal heating with no heat-pump compressor. If your existing electric tank is already in a suitable outdoor position, compare a heat pump too — particularly if rooftop PV already exists, roof space is limited or you want the simpler ground-level conversion.