What is the Best Solar Hot Water Systems?

What is the Best Solar Hot Water Systems?

Solar hot water systems are the most environmentally friendly hot water systems that you can find today.

With solar water heating, you produce zero carbon emissions and lessen your environmental footprint. A solar hot water system requires minimal maintenance. In recent years, we have a wide array of solar hot water heater products in the market, like Apricus Solar Hot Water Systems, Rheem Solar Hot Water Heaters, Rinnai Solar Hot Water Systems and Thermann Hot Water Heaters. The solar hot water systems prices have also significantly reduced over the years, making it more affordable for homeowners to install one in their home. 

How will the plumber install the solar hot water heater?

There are two types of system configurations for solar hot water system installations. The close-coupled thermosiphon entails both the solar collector and the tank to be mounted on the property’s roof. The second type which is the solar split system is much convenient and some claim aesthetically pleasing. In this type of solar hot water installation, only the solar collector rests on the roof, while the solar hot water storage tank rests sits on the ground.

What are the different types of Solar Hot Water Collectors?

Solar hot water collectors vary into two: the traditional flat panels and the evacuated tubes. What are the differences between the traditional flat panels and evacuated tubes? We have detailed this below.

Solar hot water panels are relatively cheaper in terms of upfront costs when compared to evacuated tubes, which are a newer technology. However, shipping costs would be more expensive with traditional flat panels that the evacuated tubes. Flat panels would occupy a considerable space of the pallet while the evacuated tubes are modular. When it comes to installation costs, one person can install evacuated tubes while it may take 2-3 persons to install flat panels. On the other hand, repair costs for evacuated tubes should be minimal if compared to flat panels because you don’t have to replace the whole unit. 

On the other hand, solar flat panels tend to have longer warranties that their evacuated solar tube counterparts. Make sure to check with the manufacturer to get most of the warranty they provide.

Evacuated tubes are more energy efficient in places with colder climates while the solar thermal flat panels work best in areas with warmer climates. Evacuated tubes can produce hot water of about 120 degree Celsius, making them susceptible to overheating in warmer climates. You need to install a bigger tank if you plan to use evacuated tubes. Meanwhile, solar thermal flat panels can heat water only between 76-82 degree Celsius.

What Solar Hot Water Heater is best for me?

What capacity of solar hot water system do you need? There are several factors that a solar hot water system buyer should consider when looking for the best solar hot water system for the household or property needs.

The first that comes into play is the tank storage capacity. The table summarises the capacity of solar hot water brands in terms of how many people in the household or bedrooms these can service.


Capacity in L

Thermann Evacuated Tube Solar Hot Water Systems

Rheem Loline

Rheem Premier Hiline

Apricus Australia


3-5 people


1-2 bedrooms



1-3 people




2-5 people

3-4 bedrooms


4-6 people




2-4 people



5-9 people


4+ bedrooms

The installation location of the solar hot water brand should maximise the amount of solar energy that the solar hot water unit can gather. Hot water plumbers install the solar collectors on the roof thus there should be adequate space to accommodate the equipment. Another factor to consider is the climate. Since the solar hot water unit depends on the solar energy to heat hot water, warmer climates like what we have in most parts of Australia are more compatible with this type of hot water system. During winter seasons and cloudy days when there is no ample sunlight, the booster pack that comes along with your solar hot water system will be useful.

What are the common parts of a solar hot water system?

Here are the common parts of solar hot water heaters:

  1. Solar collectors – these are devices that collect the energy from the sun and the differences were discussed earlier in this article.
  2. Heat Transfer Fluid – Heat transfer fluid carries the heat that solar collectors gather from the sun and transport them to the solar heat exchanger. 
  3. Solar heat exchangers – This a coil of piping that transfers the heat from the heat transfer fluid collectors to the cold water. The solar heat exchanger is located inside the hot water storage tank. 
  4. Boosters – the boosters can either be gas or electrical. These are backup power supply to the solar hot water heaters during Winter and days without sunlight.

Are solar hot water heaters worthy of the hype?

Solar water heaters are definitely worth it. You may have to pay more with the upfront costs but the savings you get from the operating costs would eventually catch up with your cash out in the long run. Solar hot water systems use free energy from the sun, giving you a guarantee of a high return on investment.


If you need a free quote for a brand new solar hot water system or looking into replacing your old electric or gas hot water system with a solar-powered hot water system, send us a chat in our website or dial our hotline 1300 513 630. Our friendly Hot Water 2Day representatives will help you choose the best solar hot water system with your current setup at home.