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30
System Selection
Selecting the correct Electric system
Step 1 - Tari
• Determine which tari that is going to be used
• If using both Peak & O-peak use the sizing guide for O-peak
Step 2 - Climate
• Refer to the Climate Map on page 7 to reference whether the installation is in a warm or cool climate
Step 3 - Number of persons
• Determine the number of persons living in the home
• Also consider additional demand if it is a larger home with spare bedrooms
Tank Size
Peak Electric (Continuous Tari) O-peak Electric
Warm Climate Cool Climate Warm Climate Cool Climate
40 Litres 1 1 Not Recommended Not Recommended
80 Litres 2 to 3 1 to 2 1 to 2 Not Recommended
125 Litres 3 to 4 2 to 3 2 to 3 1 to 2
160 Litres 4 to 5 3 to 4 3 to 4 2 to 3
200 Litres 6 to 7 4 to 5 4 to 5 3 to 4
250 Litres 7 to 8 5 to 6 5 to 6 4 to 5
315 Litres 8 to 9 6 to 7 6 to 7 5 to 6
400 Litres 10+ 8 + 8+ 6+
HANDY
HINT
Always err on the high side when sizing electric systems. Under sizing can result in a
lack of hot water and very unhappy customers!
Electric Storage Recovery Times
The recovery times for all storage tanks is based on 3 factors:
1. The volume of water
2. The size of the electric element
3. The set temperature
The table below shows all available Rinnai sizes and assumes that the unit is wired for immediate reheat i.e. peak tari. For
O-peak wired units, the table can only be used as a guide for how long it will take from the point that re-heating occurs.
Element size Litres per hour heated by 50ºC
1.2kW element heats 20.6 litres
2.4kW element heats 41.2 litres
3.6kW element heats 61.9 litres
4.8kW element heats 82.5 litres
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