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Rinnai Boil & Brew: Owner and installer guide: 20830-C 03-18
Water quality
The Rinnai Boil & Brew boiling water units are manufactured to suit most NZ
council water supplies. However some water supplies can have a detrimental
effect on the water heater, its operation, and life expectancy.
Hard water
In hard water areas, heated water will produce limescale which will be deposited within the
heater. If this is not regularly removed it will impair the operation of the heater. Scale reducing
or water softening devices should be considered in hard water areas. The unit is not guaranteed
against damage due to scaling.
Water quality outside the limits (as set down below) will void this warranty. Water quality tests
must be carried out at the customer’s own cost but Rinnai will reimburse any reasonable test
costs where water quality is within the limits tabled.
Water Quality and Impurity Limits
TDS (Total Dissolved Solids) Total Hardness CaCO
3
Dissolved (free) CO
2
pH
Langelier Index
Up to 600 mg/L or ppm
Up to 200 mg/L or ppm
Up to 25 mg/L or ppm 6.5-8.5 Between -1.0-0.8
Most metropolitan water supplies fall within these limits. If you are unsure about water quality,
please contact Rinnai and we will provide you with the details of an authorised agency able to
test your water for compliance to Rinnai standards. If sludge or foreign matter is present in the
water supply, a suitable filter should be incorporated in the water supply.
Some examples of water quality issues where water may need to be treated:
• Hard water (areas including Wanganui)
• Aggressive water (areas including Christchurch)
• Both hard and aggressive water (some bore water)
