Solar Versus Electric Heaters: Which Suits You?

A failing hot water system rarely gives much notice. One day there is enough hot water for the household, and the next you are weighing up replacement options while everyone is timing their showers. When comparing solar versus electric heaters, the best choice is not simply the one with the lowest purchase price. It needs to suit your household’s hot water use, roof, budget and expectations for running costs over many years.

For Busselton and the wider South West, solar hot water can be a sensible option because we receive plenty of sunshine across the year. However, a conventional electric system remains the practical choice for many homes, rentals and replacement jobs where reliability, cost and installation simplicity matter most.

Solar versus electric heaters at a glance

Solar hot water systems use roof-mounted collectors to capture heat from the sun. That heat warms water stored in a tank, either on the roof or at ground level. Because sunshine is not constant, solar systems also use a booster - commonly electric or gas - to make sure hot water remains available through cold, cloudy or high-use periods.

An electric storage hot water system heats water in an insulated tank using an electric element. It is straightforward: the element heats the stored water, a thermostat controls the temperature, and the tank keeps it ready for use. It does not rely on sunlight, roof orientation or collector performance.

The key trade-off is clear. Solar generally costs more to buy and install but can reduce the energy needed to heat water. Electric storage systems are usually less expensive upfront and easier to replace, but their running costs can be higher depending on household demand and electricity pricing.

Upfront cost and installation work

A standard electric storage system is often the simpler replacement when an existing tank has failed. If the new unit can use the same location, pipework and electrical connection, installation is generally more direct. This can make electric a sensible option when a household needs hot water restored promptly or is working to a firm budget.

Solar systems involve more components and more planning. Collectors need to be fitted securely to the roof, pipework must run between the collectors and storage tank, and the system needs an appropriate booster. Access, roof pitch, roofing material, tank location and the condition of existing plumbing can all affect the scope of work.

A higher purchase price does not automatically mean solar is poor value. A long-term household that uses plenty of hot water may recover more benefit from lower energy use than a small household that uses little. The right comparison looks beyond the initial invoice and considers expected use over the life of the system.

Roof space, shade and orientation matter

Solar hot water works best when the collectors receive consistent sun. A suitable roof area with limited shade from trees, neighbouring buildings or roof structures is essential. North-facing roof space is often preferred, although other orientations may still work depending on the property and system design.

Homes near established trees, properties with complex rooflines, or houses planning future extensions should assess shade carefully. Morning and afternoon shade can reduce collector performance, particularly through winter when the sun sits lower in the sky.

A conventional electric system avoids these roof considerations altogether. For units installed outside, the main requirements are a suitable base, safe clearances, accessible plumbing and an appropriate electrical supply.

Running costs: where solar can make a difference

Hot water is one of the larger energy uses in many households. Solar can reduce the amount of purchased energy needed for water heating because the sun provides part of the heat. In the South West, this can make a real difference across sunny periods, particularly for households with regular daytime hot water use.

But solar hot water is not free hot water every day. During overcast weather, winter, long runs of rainy days or periods of unusually high demand, the booster will need to do more work. A family with several showers in quick succession, teenagers at home, a large bath or frequent laundry use can all increase reliance on the booster.

Electric storage costs are more predictable because the system operates independently of weather. Depending on the tariff available to the property, a storage system may heat at set times or be supplied through the normal household electricity connection. It is worth understanding how your existing system is connected before selecting a replacement, as this can affect both operating costs and installation requirements.

Reliability and hot water capacity

Both solar and electric storage systems can provide dependable hot water when they are correctly sized, professionally installed and maintained. The difference is how they manage demand.

Electric storage systems are uncomplicated and familiar. If the tank is appropriately sized, it can handle normal household use reliably. The limitation is stored capacity. Once the hot water in the tank is used, the household may need to wait for the system to recover.

Solar systems also rely on stored hot water, but performance is influenced by solar gain and booster operation. A correctly sized system with an effective booster should still supply hot water through winter. However, an undersized system or poorly located collectors can leave a household relying heavily on boosted heating, reducing the cost-saving advantage.

For either option, sizing should reflect the number of people in the home and how they use hot water. A couple with staggered showers has very different needs from a family where everyone showers before school and work. Rental properties also need a practical system that tenants can use without constantly running short.

Maintenance and service life

Electric storage systems have fewer visible components, but they still need attention over time. Common issues can include a failed element, thermostat fault, temperature and pressure relief valve problems, leaking connections or corrosion in the tank. Water quality and local conditions can influence service life.

Solar hot water systems have additional parts to inspect, including collectors, valves, pipe insulation, pumps on pumped systems and the booster. Roof-mounted components must remain secure and weatherproof. If hot water temperatures seem inconsistent, if a relief valve is discharging continuously, or if there is visible leaking around the tank or pipework, it is best to arrange an inspection rather than wait for a complete failure.

Regular servicing can help identify small issues before they affect supply. This is particularly valuable for systems that are several years old, holiday homes that sit vacant for stretches, and rural properties where access to urgent replacement equipment may take longer.

Is a heat pump another option?

Heat pump hot water systems are often included in the same conversation, but they are different from a standard electric storage heater. They use electricity to move heat from the surrounding air into the water, rather than relying solely on an electric element. This can make them more energy-efficient than conventional electric storage in suitable conditions.

They can be a good option where roof space is shaded or unsuitable for solar collectors, but the owner still wants to reduce hot water energy use. They do need an outdoor location, can produce some operating noise, and should be selected with local conditions and household demand in mind. A heat pump is worth considering alongside solar and electric rather than assuming there are only two choices.

Choosing the right system for your property

Solar hot water is usually worth closer consideration if you own the property long term, have suitable unshaded roof space and want to reduce the energy required for water heating. It can suit larger households especially well, provided the tank capacity and booster are matched to demand.

A conventional electric system can be the better fit when the existing unit needs fast replacement, the budget is limited, roof access is difficult, or the property is a rental where a straightforward and familiar system is preferred. It is also a practical option for homes with limited sun exposure.

Before making a decision, consider your current tank size, how often hot water runs short, the location and condition of existing services, and whether your household may grow or change. Replacing like-for-like is sometimes sensible, but it can also be a missed opportunity if the old system was never properly sized for the home.

For South West property owners, the most useful question is not whether solar or electric is universally better. It is which system will deliver reliable hot water at a cost and level of maintenance that makes sense for your property. A qualified local plumber can assess the practical details before installation, helping you choose a system that is ready for everyday use rather than just looking good on paper.