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Rinnai 

HOTFLO (HFE Series) Electric Storage Water Heater OIM

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 Aluminium 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.

OPERATIONAL OVERVIEW

(How the hot water system works)

Single Element Model: 

A vitreous enamel lined steel cylinder stores water which is heated by a single 

thermostatically controlled heating element, located at the base of the cylinder� 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:

 A vitreous enamel lined steel cylinder stores water which is heated by a twin thermostatically 

controlled heating elements, one element is located at the base of the cylinder, while the other is located near the 

top� The water heater connects directly to the mains water supply� 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 elements 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�

Turning Water Heating System ‘OFF’

If the water heater is not going to be used for only a few days, we suggest you leave it 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 building�

Turning Water Heating System ‘ON’

Switch on the electric supply to the heating elements� The switch is usually marked and located in the electricity 

meter box of the building� Water heating will now occur as required� It may take a number of hours before hot water 

is available�

DRAINING 

WARNING

Draining

MUST BE 

carriedoutbyaqualifiedperson.

Watermaybe

HOT

 during draining.

Drain the water heater as follows:
1�  Isolate or turn ‘OFF’ the water heater at the electricity supply�
2�  Close the cold water isolation valve at the inlet to the water heater�
3�  Close all hot water taps�
4�  Operate the PTR valve easing gear - gently� Operating the PTR valve easing gear will relieve the pressure 

in the water heater�

5�  Undo the cold water inlet union� Attach a hose to the water heater side of the union� Let the other end of the 

hose go to a drain�

6�  Operate the PTR valve easing gear again� This allows air into the water heater and will result in water draining 

through the hose�

IMPORTANT INFORMATION

Summary of Contents for HOTFLO HFE125S18

Page 1: ...egulation All local regulatory requirements including all local OH S requirements This appliance must be installed maintained and removed by a Qualified Person For continued safety of this appliance i...

Page 2: ...Rinnai 2 HOTFLO HFE Series Electric Storage Water Heater OIM This page is intentionally blank...

Page 3: ...ns 12 Installation Methods 13 Hot Water Plumbing System Example No Temperature Limiting Device 13 Hot Water Plumbing System Example With Temperature Limiting Device 13 Hot water plumbing system Exampl...

Page 4: ...Rinnai 4 HOTFLO HFE Series Electric Storage Water Heater OIM This page is intentionally blank...

Page 5: ...rules and regulations For continued safety of this appliance it must be installed operated and maintained in accordance with the manufacturer s instructions This appliance is heavy use 2 people or mec...

Page 6: ...trades person WARNING The thermostat setting must only be adjusted by an Electrician or other suitably qualified trades person The access cover to the element and thermostat must only be removed by an...

Page 7: ...by a qualified person It is normal for the PTR valve to release a small quantity of water through the drain pipe during heating If the valve dribbles or leaks continuously try easing the valve gear fo...

Page 8: ...eated 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 A vitreous ename...

Page 9: ...may need to be increased Contact your installer or Rinnai to discuss adjusting the thermostat No water from the hot tap Restriction in the hot tap or failure of the cold water supply to the heater Che...

Page 10: ...D WARNING LABELS LEFT COLD WATER INLET Connection RP 3 4 20mm LEFT HOT WATER OUTLET Connection RP 3 4 20mm use a union connection and Insulate Hot water pipe PTR VALVE DRAIN PIPE Supplied by Installer...

Page 11: ...y F Electrical Entry Upper Element G HFE25S 452 490 415 297 153 80 HFE50S 694 490 415 524 158 80 HFE80S 900 590 515 683 225 155 HFE125S 1245 590 515 1020 225 155 HFE160S 1530 590 515 1310 225 155 HFE2...

Page 12: ...4 HFE160T36 HFE160T48 160 1800 2400 3600 4800 1800 2400 3600 4800 HFE200S24 HFE200S36 HFE200S48 200 2400 3600 4800 HFE250SSL36 HFE250SSL48 250 3600 4800 HFE250T36 HFE250T48 250 3600 4800 3600 4800 HFE...

Page 13: ...E LIMITING DEVICE KITCHEN LAUNDRY ENSUITE BATHROOM TEMPERED Supply NON TEMPERED SUPPLY NON RETURN VALVE TEMPERATURE LIMITING DEVICE TLD NON RETURN VALVE NON RETURN VALVE PLV 500 kPa Not Supplied with...

Page 14: ...t Supplied with all models ECV Not Supplied 700 kPa or 850 kPa ISOLATING VALVE PTR VALVE Supplied 850 kPa or 1000 kPa WATER HEATER COLD Supply ISOLATING VALVE NON RETURN VALVE FLOW RETURN PUMP ISOLATI...

Page 15: ...0 kPa WATER HEATER COLD Supply NON RETURN VALVE FLOW RETURN PUMP ISOLATING VALVE UNTEMPERED SUPPLY TLD CAUTION Valves with pressure ratings other than specified are unsuitable and MUST NOT be used For...

Page 16: ...n occur as a result of water leakage the water heater MUST BE installed with a safe tray overflow tray and drain Construction installation and draining of the safe tray MUST comply with local regulato...

Page 17: ...s under Installation Methods WARNING Valves with pressure ratings other than specified MUST NOT be used An isolation valve and non return valve MUST BE fitted in the cold water supply to the water hea...

Page 18: ...BE fitted to the valve outlet in accordance with the section Relief Valve Drain Lines on the bottom of page 18 The valve body MUST BE insulated in accordance with local regulatory requirements and AS...

Page 19: ...g element Check the available tariffs with the local electricity supplier The Off Peak overnight is usually the most economical for the customer Electrical Connections WARNING The water heater MUST BE...

Page 20: ...fore removing the access cover to the element and thermostat The access cover to the element and thermostat MUST ONLY BE removed by an Electrician or other suitably qualified trades person The thermos...

Page 21: ...Air will now be forced out of the taps 3 Close each tap when water runs freely without air bubbles 4 Check all plumbing connections and pipe work for water leaks 5 Connect the water heater to the ele...

Page 22: ...ce please call our National Help Line Rinnai recommends that this appliance be serviced every year Head Office 100 Atlantic Drive Keysborough VIC 3173 P O Box 460 Braeside Victoria 3195 Product Sales...

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