Solar Hot Water System sizing

• The most significant factor in determining the appropriate size of solar hot water system for your needs is the average amount of hot water your household consumes per day.
• Methods to determine the daily amount of Hot Water your household uses (from most accurate to least accurate)
  • 2. Have a hot water meter installed
  • 3. Use a Hot Water Usage Calculator tool
  • 4. Use your water bill to estimate usage
  • 5. Estimate 60 liters of hot water per day per person.
• The following guidelines can be used to determine system sizing:
  • 1 Collector: 0 - 150 liters per day (1-3 person household)
  • 2 Collectors: 150 - 350 liters/day (3-6 person household)
  • 3 Collectors: 350 - 550 liters/day (6 or more people)
  • 4 Collectors: 550 - 800 liters/day water usage
  • Larger systems are available.
• In addition to daily water usage the following will all contribute to the optimum system configuration for your household:
  • Amount of sunlight available to your collectors
  • Tilt and orientation of roof, or mounting location
  • Space available to mount collectors
  • Predicted change in hot water usage over short to medium term

Contact us for help determining your daily water usage or detailed savings analysis specific to your location.