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Before buying a system, what information should I have at hand?

You should be able to answer the following questions:
  •     Is the supplier and or installer listed with SESSA?
  •     Is the SWH system a SABS tested and passed system?
  •     Can the supplier provide a Q factor?
  •     Are you prepared to have a tank on the roof?
  •     Have you looked at measures to reduce hot water consumption?
  •     What size of system do you require?
  •     What is the efficiency of the system?
  •     What are the likely daily kWh savings?
  •     What does the system cost?
  •     What is the payback period?