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Solar Hot Water Systems Installed across Newcastle, Lake Macquarie & the Hunter Valley

Water heating can be responsible for up to 25% of your energy consumption. Especially for households relying on electricity for water heating, a solar hot water system can save significant amounts of money. With a bit of planning (for instance, taking showers in the evening, after a sunny day), a solar hot water system can save you up to 80% of your water heating costs. So what’s the best solution for your household? Read on for an overview of solar hot water systems available in Australia, how they work, and the pros and cons of each.


Flat Plate Collectors for Solar Hot Water


A solar flat plate collector, a.k.a. thermosiphon or roof-mounted system, typically consists of a water tank and a large heat-absorbing plate, both installed on the roof. The flat plate collector is something of a hot box, or a greenhouse: the surface, or plate, absorbs the sunlight energy and traps it inside in the form of heat. Here, a series of copper pipes start heating up and cause the water contained within to warm up, as well; the latter circulates back and forth between tank and tubes until it’s hot enough, at which point it runs back down and into the household’s plumbing system.


While flat plate collectors tend to be cheaper and easier to install with respect to evacuated tube collectors, they are not very efficient due to their surface area being, well, flat. They work best when the sun is right above the roof and perform less at most other times, including the winter. Besides, flat plate systems can be heavy, to the point of potentially deforming the roof underneath, which then becomes a safety concern.


Evacuated Tube Collectors for Solar Hot Water


A second solar water heating method is called evacuated tube collectors. Also known as a split- or low-line system, this technology uses a similar mechanism to that of flat plate collectors. Instead of a flat surface, however, this type of solar hot water panel employs cylindrical tubes that absorb solar energy while at the same time limiting heat loss. The tube has no water in it: instead, it fits into a copper manifold, and the heat is then transferred across to the water. A sensor checks the temperature differential and coordinates a circulating pump, which sends cold water up to the roof and hot water back down and into the storage cylinder.


The main benefit of this technology is that the individual, rounded tubes increase the area perpendicular to the sun’s rays at any given time of the day, making them up to 33% more efficient vs flat plate collectors, as well as faster. It can take as little as three to four hours to collect a full tank of hot water, compared to six hours for flat plate collectors. Naturally, increased efficiency attracts higher-value STC’s, as well. In addition, were a single evacuated tube to be damaged during a storm, the rest of the system would not be impacted, and repair would only take 10 minutes, at minimal cost.


Compared to flat plate systems, evacuated tube collectors perform well in cold and overcast weather and are resilient even in challenging situations, such as heat waves or subzero temperatures. While evacuated tube technology may require a higher initial investment, they recoup this quite well over the years. One weakness of this system, however, is the water pump, a device that, while for the most part reliable, only has a 2-year warranty on it.


iStore Technology for Solar Hot Water


The newest technology available on the market and which wins our recommendation is called iStore by Solargain. It is virtually an air conditioning unit sitting on top of a tank, but working in reverse: through the use of a heat pump, it heats water up, instead of cooling it down. According to the Melbourne Energy Institute and the ‘Beyond Zero Emissions Report: 2013’, this type of heat transfer is 80% more efficient than electric or gas hot water systems. Added bonus: since the water tank sits at ground level, there is no need for any plumbing through the roof, which significantly reduces installation time and costs. As a guideline, an iStore system may only take two hours to put up, compared to a roof-mounted plumbing system where anywhere from five hours to a whole day may be necessary.


This system is unique in that it allows to store excess production in the form of hot water, because water is an energy storing system. Its storage capacity is comparable to that of a 6kW battery. iStore fits perfectly with our vision of making a household as efficient and self-sufficient as it can be—especially when coupled with a solar panel system. In fact, when your production has been at its highest for a few hours, your batteries are full, and you’ve got excess electricity that would otherwise go to the grid, water can act as a real energy storage device.


We hope that our overview has helped you appreciate what a solar hot water system can do for you. The average family may save 50% to 80% of their heating bills by switching to solar hot water, and in the sunniest of climates, that figure may be nearly 100%. Below are a few more FAQs with some additional information. We’ll be happy to answer any further questions or address any concerns either via phone or email at the contact details below.




Q: Where do your solar hot water systems come from? Who do you work with?

Our brand of choice for solar hot water systems is iStore by Solargain, premium Australian supplier of solar products, established in Perth in 2005. Our history with Solargain goes way back to 2016. In fact, we specialised in hot water solutions right from the start, and subsequently branched out into other related solar industries, as well.


Q: How many people can the typical residential solar hot water system supply?

Most systems we install feature a 300- to 340-litre tank. With a sensible use of hot water, this volume comfortably covers the needs of a family of two adults and two children.


Q: How long can I expect my solar hot water system to last? How long does ROI take for a solar hot water system?

Component warranties differ, from 5 years on the cylinder to 2 years on the refrigeration and electrical components, to 1 year on other components. In general, you can expect a payback of 5 years for your initial investment (yearly ROI of 15%).


Q: What happens if a storm damages my solar hot water system?
GoSolar offers maintenance and repair services for damage due to storm damage. In the case of an iStore system, there are no system parts on the roof, so the chances of storm damage is reduced greatly.

How A Solarwork Evacuated Tube System Works

Sunlight passes the outer glass layer through the vacuum and onto the selective coating of the inner glass layer trapping the heat within the evacuated tube.

Heat is transferred to the copper heat exchanger within the insulated manifold via high performance heat pipe.

An energy efficient circulating pump is used to transfer water to the heat exchange where it is solar heated as it passes across the heat pipes. The solar heated water is returned to the storage cylinder.

SolarArk systems are resilient in all weather conditions from extreme heat waves, hailstorms, strong winds and freezing temperatures.

SolarArk systems are perfectly suited for frost prone areas, snow and rapid changes in temperature capable of producing hot water under harsh environments.


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SolarArk is an Australian manufacturer of high quality, enhanced performance evacuated tube solar collector with our own manufacturing and warehousing facility. Our team of engineers and skilled employees are committed to our product development and quality control.

SolarArk Products can be used for residential, commercial and industrial applications effectively harnessing the suns’ energy, due to the cylindrical shaped tubes designed to track the sun for longer periods of the day, at all times of the year.


Significantly reduce your ever increasing energy costs

Clean energy with long product life expectation
Reduce your carbon foot print

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