Roof Mounted Systems

Key Features

Roof mounted Solar systems are ingenious in their simplicity. The black aluminium absorber collects the sun’s heat and transfers it to the water in the copper risers. Copper is used for the risers for its high thermal conductivity ensuring the maximum amount of heat energy is passed to the water. As the water in the risers is heated, it rises into the tank to be replaced by cooler water from the tank. The solar heated water is then stored ready for use – hot water free from the sun.

In Western Australia the model of choice is a ceramic lined tank with a protective sacrificial anode. Stainless steel tanks are no longer recommended by major manufacturers for use in Perth due to our water quality.

How Roof Top Solar Systems Work:

In Perth, a solar system has a vitreous enamel (ceramic) lined solar storage tank installed on the roof directly coupled to the solar collectors. It works on the simple scientific fact that hot water rises. As the sun heats the water in the solar collectors, the increase in temperature causes the water to rise through an insulated copper pipe into the storage tank. Copper is used for the risers for its high thermal conductivity ensuring the maximum amount of heat energy is passed to the water. This allows cooler water from the solar storage tank to flow into the solar collectors to be heated by the sun’s energy. This process is called thermosiphon and continues while solar energy is available (ie: whilst sun shining).

Systems have a ceramic lined tank with a protective sacrificial anode. systems can be installed with an optional over temperature protection system to prevent over performance during periods of higher temperatures.

Frost/Freeze Protection

An Open Circuit system does not have freeze protection and is not suitable for installation in areas prone to freeze conditions. Freeze conditions occur below 5°C (41°F). This system has NO WARRANTY for freeze damage. In areas that are prone to frost / freezing, a Closed Circuit system should be used.

Closed Circuit Systems are protected against freezing or harsh water conditions by a heat transfer fluid. It is a blue, non-toxic, propylene glycol fluid which, when mixed with water, provides the Heat Transfer from the solar collectors to the heat exchanger jacket around the tank. Glycol is used to lower the freezing temperature of the Heat Transfer Fluid and so provides protection against freezing. It is a special food grade solution and is the only solution permitted to be used in the closed-circuit systems. Glycol has been approved by the National Health and Medical Research Council of Australia.

Solar Boosting

In-Tank Boosting

An isolating switch is installed in the electrical meter box for an electrically in-tank boosted model. This should be left switched on to allow the booster heating unit to operate if required. The booster heating unit is for heating the water at times of low solar energy gain, such as during very cloudy or rainy weather, or during the colder months. The booster heating unit will only activate if heating is required and power is available from the switchboard. When the water is below the thermostat setting, the booster heating unit will turn on and heat the water. The booster heating unit will automatically turn off when the temperature of the water reaches the thermostat setting. If the water temperature drops below the setting again the booster will re-activate.

In-Line Gas Boosting

An in-line gas booster (also known as a continuous flow gas booster) can be installed between the solar water heater and the hot outlets in the house. This booster should be permanently active. The booster senses the temperature of the water passing through it: if the water temperature is above its temperature setting it does nothing; if below it will automatically heat the water up to the preset outlet temperature setting. This device ensures hot water delivery for a variety of hot water demands without the need for user intervention while enabling maximum solar energy contribution to the water heating. For more information on this booster, consult the owner’s manual for the product.

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    Product(s) / Service(s)

    Solar Hot WaterSolar PowerSolar Pool Heating