Our range of Hills Solar Esteem and Exceed Adelaide Solar Hot Water systems have been approved by Australian Standards (AS/NZS 2712 & AS/NZS 4234) and carry the Australian Standards and Watermark seals of approval. (Australian Standards License No. SMKP20319 – your choice of storage tank sizes- from 160-330 litres – your choice of stainless steel or glass-lined storage tanks – 10, 22, 30 and 40-tube collectors to suit your needs – your choice of electric or gas boosting.