Monash University


  • Monash University is situated in Ruimsig.
  • Some residences are on campus, making hot water a significant energy consumer.
  • To reduce monthly energy bills and carbon footprint it was decided to reduce hot water requirements by installing solar water heating to aid with demand. 


  • As hot water could be required any time of day, it was important to ensure hot water regardless of time of day or weather.
  • The solar systems need to work at maximum efficiency
  • Some residences have in-roof geysers, while other have geysers located next to the building.
  • It was decided to implement pre-feed systems to increase the efficiency of the solar systems and to maximize the saving.
  • Where possible aesthetics must be kept in mind
  • The best option was to use on-roof single units to feed the in-roof systems, while large bulk tanks could pre-feed the geysers located next to the various buildings.
  • The large systems could exchange with the tanks it's feeding, thus needed to be overdesigned in order to heat not only the 1000litre but an additional 1200 litre of direct storage was available.
  • High usage on the 1000litre systems required them to be designed in order to heat the tanks at least 3 times per day.


Specification – 4x1000litre systems Units
Storage Volume4x1000 litre
Collector Area4x20x2m²
Daily Energy Generation (Summer)1004kW.h/day/system
T (Summer) – 1000litre only225°C
Daily Energy Generation (Winter)573kW.h/day/system
T (Winter) – 1000litre only128°C


Specification – 26x300litre systems Units
Storage Volume26x300 litre
Collector Area26x2m²
Daily Energy Generation (Summer)652kW.h/day/system
T (Summer)72°C
Daily Energy Generation (Winter)373kW.h/day/system
T (Winter)43°C


PDC Solar Geysers
Susman Avenue, Blairgowrie
Johannesburg, Gauteng
South Africa
Phone: +27 (0)11 886 4661