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SAFETY DEVICES
For safe operation this water heater is fitted with a combination Pressure & Temperature Relief (PTR) Valve, a
thermostat and an over-temperature cutout for each heating element.
• DO NOT tamper with or remove safety devices.
• DO NOT operate this water heater unless all safety devices are fitted and in working order.
WARNING
• DO NOT block or seal the PTR Valve and drain pipe.
ANODE
The water heater is fitted with a sacrificial anode to extend it's life. It will slowly dissipate whilst protecting the
cylinder. The life of the water heater may be extended by arranging for an authorised person to inspect the anode
and replace it if required. It is recommended that the anode be inspected at least every 5 years.
The factory fitted Rinnai anode is Magnesium based. This anode is suitable when the total dissolved solids (TDS)
content in the water supply does not exceed 600 mg/L, which is the case in most areas. In areas where the total
dissolved solids (TDS) content in the water supply exceeds 600 mg/L the Rinnai Aluminimum based alloy is
required.
WATER QUALITY
The water quality of most public supplies is suitable for the water heating system. The water quality from bore wells
is generally unsuitable for the water heating system. Refer to the 'Warranty Conditions' for water quality parameters
and how they affect the warranty conditions. If in doubt about the water quality, have it checked against the
parameters listed in the warranty conditions.
If sludge or foreign matter is present in the water supply, a suitable strainer filter should be incorporated in the water
supply to the system.
TURNING 'OFF' THE WATER HEATING SYSTEM
If you plan to be away for only a few nights, we suggest you leave the water heating system switched on. If it is
necessary to switch off the water heater, the switch is usually marked and located in the electricity meter box of the
dwelling.
TURNING 'ON' THE WATER HEATING SYSTEM
Switch on the electric supply to the heating element. The switch is usually marked and located in the electricity
meter box of the dwelling. Water heating will now occur as required. It may take a number of hours before hot water
is available.
HOW THE WATER HEATER WORKS
SINGLE ELEMENT MODEL
This model has one electric heating element with its own thermostat. A vitreous enamel lined steel cylinder stores
water which is heated by an heating element located at the base of the cylinder. Its own automatic thermostat
controls the water temperature. The water heater connects directly to the mains water supply.
The heating element can be connected to a Continuous or Off-Peak electricity supply. The continuous supply is
appropriate when the water heater capacity is less than the daily usage of hot water. The Off- Peak supply is
appropriate when the water heater capacity exceeds the daily usage of hot water. The Off-Peak supply allows
heating only for set periods and a volume of water sufficient for daily usage is heated during the set period and
stored. The Off-Peak supply is usually cheaper. Electricity supply types and tariffs vary according to the local
electricity authority.
TWIN ELEMENT MODEL
This model has two heating elements, each with its own thermostat. A vitreous enamel lined steel cylinder stores
water which is heated by a heating element located at the base of the cylinder and the other near the top. Its own
automatic thermostats control the water temperature.
The bottom heating element heats the whole contents of cylinder and Top heating element (booster) only operates
during the high demand periods to heat the upper portion of the contents of the cylinder.
The two heating element are wired for non-simultaneous operation, so that only one heating element can operate
at a time. The bottom heating element can be connected to an off-peak electricity supply, and the top heating
element to a continuous electricity supply.
Rinnai Australia
IMPORTANT INFORMATION
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HOTFLO Electric Storage Water Heater Operating/Installation Manual
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