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Frequently Asked Questions

Why choose a Hills Evacuated Tube Solar Hot Water System?

Evacuated tube technology has been used in Europe for many years and is more efficient in cooler climates than standard flat plate technology. At Hills we have undertaken research to choose a quality system that will perform best in all conditions especially in winter when thermal energy is at its lowest therefore giving you the best performance possible all year.

 

How does a Hills Solar Evacuated Tube Work?

The advanced design incorporates tubes that consist of 2 layers of borosilicate glass with a vacuum layer between them. The vacuum acts like a thermos flask, retaining up to 97% of the thermal energy, resulting in an increased efficiency. The Sun's thermal energy is then transferred to the manifold via the heat pipe located in each tube.

 Evacuated Tube diagram

The small amount of evaporative liquid in each tube is super heated by the sun's energy and forms into a gas. The gas rises to the top of each pipe. Heat transfer then occurs between the pipe and water passing through the manifold. The water is then transferred to the tank.

The cylindrical design of the tubes ensures effective collection of the sun's thermal energy throughout the day.

 

Will my  Hills Solar Hot Water System work if the sun doesn’t shine?

Even on cloudy and rainy days you may still achieve some solar gain. The Hills Solar Hot Water Systems are available with an electric or gas booster to assist heating the water on poor solar gain days.

 

Are the Hills Solar Hot Water Systems eligible for Government rebates?

Providing you meet the Federal Government's criteria all Hills Solar Hot Water Systems are eligible for STCs (Small Scale Technology Certifiates). There is also a $1,000 Federal Government rebate.

 

For more information visit www.orer.gov.au (Office of the Renewable Energy Regulator) Some States and local councils also offer incentives on installation of solar hot water systems, or visit www.climatechange.gov.au for further information.

 

What are STCs? 

STCs are a form of currency created by the Federal Government under the Renewable Energy (Electricity) Act 2000 and are used to demonstrate compliance with the requirements of the Government’s Renewable Energy Target (RET) scheme. The Hills Solar Hot Water Systems qualify for these generous Government Rebates (conditions apply). There are 4 Australian zones, which will determine the number of STCs for each system. To find the STCs zone for your postcode click here .

 

Which is the best collector orientation?

The ideal location for collectors is facing due North, however 45 degrees North West or North East is acceptable with minimal effect due to the cylindrical design.


 

Will my Hills Solar Hot Water system freeze?

Hills Solar Evacuated Tubes are frost tolerant and have passed the AS/NZS 2712 :2007 Standards for both, Hail & Freeze Resistance. The Hills Solar Hot Water Systems have passed the Freeze Test to –15° C without the need for a heat exchanger or Glycol. 

 

Where can I buy a Hills Solar Hot Water system?

Please contact our Customer Service Team on 1300 363 386 or email info@hillssolar.com.au