Installation guide

Rinnai Continuous Flow Water Heating Specication Guide 02-13 | 51
Appendix 2: Water ow and gas usage
When calculating the model of Rinnai Infinity required it is important to determine what the incoming water
temperature will be. This is usually calculated on the worst case scenario, i.e. in winter. For example:
- Northland and Auckland, use 15 °C
- Bay of Plenty, Gisborne, and Hawke's Bay, use 10 °C
- Waikato, Taranaki, Wanganui, Manawatu, Wairarapa, Wellington, and South Island, use 5 °C
Degree rise
In the specification pages for the Rinnai Infinity water heating range we express a parameter called 'Nominal water
capacity'. This means that at a 25 °C rise, the unit will produce a certain number of litres per minute of hot water.
For example:
- The Rinnai Infinity VT26 external will produce 26 litres per minute at a 25 °C rise
- The Rinnai Infinity VT24 external will produce 24 litres per minute at a 25 °C rise
Using the example above, for an incoming water temperature of 10 °C and a required temperature of 55 °C, the
Rinnai Infinity VT26 external will produce 14.4 litres per minute at a 45 °C rise (55-10), and the Rinnai Infinity VT24
external will produce 13.3 litres per minute at a 45 °C rise.
Water flow and gas usage tables
Use these tables to calculate the model performance based on the incoming water temperarure, and the required
outlet temperature.