An electric hot water system compatible with rooftop solar panels.
When a Frenchs Forest homeowner’s solar hot water system began leaking, they contacted us for assistance. Once onsite and on the roof, we could see that the system had likely been leaking for some time, but the issue only became obvious during winter when the household started taking longer showers and noticed they were running out of hot water.
Finding the best replacement option.
The customer explained that they and their neighbour (the property was a duplex), were about to have rooftop solar panels installed. This influenced the available options, which included:
- Installing a new rooftop solar hot water system, leaving adequate space for the maximum number of solar panels to be installed.
- Replacing the old setup with roof collectors and a ground-mounted tank
- Switching to an energy-efficient electric hot water system that could later be powered by their future solar panels
After reviewing the benefits and costs of each option, the homeowner decided on a modern electric hot water system, which offered a simple, reliable and energy-efficient solution that could easily integrate with their upcoming solar panel installation.
Heating hot water with rooftop solar panels.
With both duplex owners preparing to install solar PV panels, it was the perfect opportunity to replace the old rooftop solar system with a high-performance electric storage unit.
This new system provides dependable hot water while remaining ready to run on solar power once the PV system is operational. By separating the hot water unit from the rooftop setup, the homeowner avoids unnecessary maintenance while still benefiting from solar energy in the future.
This approach provides the best of both worlds: energy savings and low maintenance, with the flexibility to connect to solar power when ready.
Choosing an efficient electric hot water system
After reviewing several options that suited their needs, the homeowner selected the Vulcan 315L Electric Hot Water System. This is a cost-effective, Australian-made model known for its reliability and performance.
Installed neatly at ground level, this system is easy to access and maintain. Its modern design and insulation help reduce energy consumption while ensuring consistent hot water all year round.
To improve energy efficiency, modern electric water heaters now offer:
- Improved insulation that retains heat longer and reduces energy waste
- Smart thermostats for precise temperature control
- Faster recovery times for consistent hot water availability
- Compatibility with rooftop solar panels to lower household electricity costs

The Vulcan 315L Electric Hot Water System
The Vulcan 315L is built for durability and designed to meet the needs of medium to large families with features including:
- 315-litre capacity ideal for busy households
- Heavy-duty steel cylinder with vitreous enamel lining for longevity
- Suitable for both indoor and outdoor installation
- Left-hand plumbing connections for straightforward replacement of older units
- Optional twin-element model for faster recovery
- Compatible with off-peak electricity tariffs for lower running costs
- 10-year cylinder warranty for peace of mind
For this homeowner on the Northern Beaches, the Vulcan 315L provided the perfect combination of capacity, performance and efficiency, while also being ready to run on solar-generated power once the PV system is installed.
NEED HOT WATER ADVICE?
At Cheapa Hot Water, we help homeowners across the Northern Beaches to upgrade to sustainable, low-emission hot water systems. Whether replacing an old solar system, switching from gas, or upgrading an existing electric unit, our licensed specialists can recommend the most efficient and cost-effective option for your property.
Pairing a modern electric hot water system with rooftop solar panels can significantly reduce your energy bills and environmental footprint while providing reliable hot water all year round.
If your current water heater is leaking, inefficient or approaching the end of its life, call our friendly team. We offer fast, professional service and expert advice. With more than 30 years of experience, we specialise in hot water repairs, replacements and upgrades for all makes and models.

