Thermann Smart Electric

Download the 'Thermann Control' app from the App Store or Google Play
Create an account and verify your email
Enable Wi-Fi, Bluetooth and Location on your phone
Select 'New Configuration' and choose your 2.4 GHz Wi-Fi network
Name your heater and select your region
Turn the heater ON at the isolator switch — you have a 5-minute pairing window

The app will pair to the heater and default to Manual mode at 65°C.

2.4 GHz Wi-Fi network only — 5 GHz is not supported
Reliable internet connection with strong signal at the heater's location
Android 5.0+ or iOS 14.0+

If your router uses a combined 2.4/5 GHz network, try splitting them or creating a 2.4 GHz guest network. Watch out for settings like 'band steer' or 'smart connect' on your router, as these can force the heater onto a 5 GHz channel.

Yes. Once paired via Wi-Fi, you can adjust temperature, change modes and set schedules from anywhere with an internet connection through the Thermann Control app.

Check that your router is working and the heater has power
After a power outage, it may take up to 10 minutes to reconnect
Check your router hasn't blocked the device — look for 'SMART ELECTRIC' or 'ESPRESSIF' in your blocked devices list
Try removing the heater from 'Manage Water Heater' in the app and re-pairing it
Ensure the thermostat dial is set to OPK/Wi-Fi

Download and install the Thermann Control app on the secondary device
Create an account and sign in (steps 1–5 of setup)
On the primary device, go to Settings > Manage Water Heater > Share
A QR code will appear — scan it with the secondary device

Note: Sharing gives full control of the heater. If you re-pair the heater to a new account, all previously linked users will be removed.

This means the thermostat dial inside the heater is not set to its factory position. A licensed plumber must check that the thermostat dial is set to OPK/Wi-Fi. If the issue remains unresolved, contact Customer Service on 1300 412 612.

Yes. To set up:

Go to Settings > Consumption > Set Price/Power
Enter your electricity cost per kWh (e.g. 25 cents = 0.25)
Enter the heater's power rating in watts (e.g. 3.0 kW = 3000 watts)

The power rating is on the data label on the side of the heater. The consumption monitor may take several hours to display initial data.

You can use a temporary mobile hotspot:

Turn on mobile data and hotspot on a secondary phone
iOS users: enable 'Maximize Compatibility' in Personal Hotspot settings
Connect your primary phone to that hotspot, then pair the heater

This is a temporary solution — a Wi-Fi extender is recommended for ongoing use. Without Wi-Fi, the heater still works but as a standard electric heater without smart features.

Green LED ON/OFF — Eco Mode active/inactive
Red LED ON/OFF — Heating element active/off
Blue LED ON — Connected to Wi-Fi
Blue LED OFF — Disconnected from Wi-Fi
Blue LED BLINKING — Pairing mode active (5-minute window after power on)

Four modes are available through the Thermann Control app:

Manual — Set temperature from 50°C to 70°C (default 65°C). Works like a conventional electric heater.
Eco — Machine learning analyses your usage patterns and automatically adjusts heating times and temperature to save energy.
Schedule — Heat only during specified times of the day. Ideal for solar PV or Time of Use tariffs.
Holiday — Turns off heating when you're away. Set a return date so hot water is ready when you get back. An anti-bacterial cycle still runs weekly.

Manual — Your heater is on a controlled load (off-peak power). Save by lowering temperature to as low as 50°C.
Schedule — You have solar PV or a Time of Use tariff. Schedule heating during cheap/solar hours.
Eco — You're on a flat-rate tariff with no solar. It learns your usage and optimises automatically.
Holiday — You're away for extended periods.

Use the Thermann Optimisation Calculator in the app for personalised advice.

Available in Schedule mode only. T-Comfort sets a minimum water temperature so the heater will heat even outside scheduled times if the tank drops too low.

Adjustable range: 10°C to your schedule set point
Set to 10°C for minimal interference with your schedule
Has no effect in Holiday or Turn OFF modes

If the water drops more than 8°C below the T-Comfort set point, it will override the schedule to maintain the minimum temperature.

Yes. If the water temperature drops to 5°C, the heater automatically starts heating to 16°C to prevent freeze damage. This works in all modes — including Holiday and Turn OFF — as long as the heater has power supply.

Check the app — ensure the heater is not in Holiday mode, Turn OFF, or an empty Schedule
Confirm power is available — check the breaker hasn't tripped
If on a timed tariff (off-peak), power may not be currently available
Ensure the thermostat dial is set to OPK/Wi-Fi

If the problem persists, contact Customer Service on 1300 412 612.

Recovery rates depend on your element size:

1.8 kW — ~31 L/hr at 50°C rise
2.4 kW — ~41 L/hr at 50°C rise
3.0 kW — ~51.6 L/hr at 50°C rise

For example, a full 250L tank with a 3.0 kW element takes roughly 5 hours from cold. The heater only starts reheating when the temperature falls at least 8°C below the set point. You can monitor progress live in the app.

This is normal. The temperature sensor is at the bottom of the tank. When heating finishes, the hotter water rises to the top and cooler water settles near the sensor, causing a 2–3°C drop in the displayed reading. The actual hot water at the outlet is at the correct temperature.

Common causes:

Shower flow rates may be higher than expected — test with a bucket
Tank may be undersized for your household
Leaking hot water pipe or dripping tap — even a small leak wastes significant hot water
In Schedule mode, not enough heating hours allocated

Contact your local Reece branch for tank sizing advice.

The heater automatically heats water above 62°C for 32 minutes every 7 days if stored water has been consistently below 62°C.

Runs regardless of mode — including Holiday and Turn OFF
The app will notify you when the cycle starts (if notification permissions are enabled)
You cannot change modes or settings during the cycle
The heater returns to its previous mode once the cycle completes

80L — suits 2–3 people (continuous supply)
125L — suits 3–4 people
160L — suits 3–5 people
250L — suits 3–5 people
315L — suits 4–6 people
400L — suits 5–9 people

Element options: 1.8 kW, 2.4 kW, and 3.0 kW (400L only available in 2.4 kW and 3.0 kW). Hard water models available for all sizes — indicated by an 'H' at the end of the model number.

E2 indicates a temperature sensor (NTC probe) fault — short circuit or open circuit in the high or low probe.

To troubleshoot:

Turn the heater OFF at the isolation switch or meter box
Turn it back ON
If the error reappears, contact Customer Service on 1300 412 612

E3 means the temperature gap between the two NTC probes exceeds 50°C.

To troubleshoot:

Turn the heater OFF at the isolation switch or meter box
Turn it back ON
If the problem persists, contact Customer Service on 1300 412 612

E4 is a warning for low heating rate while the element is ON. The element will continue to heat.

To troubleshoot:

Check that all hot water taps are closed
If connected to a ring main, the warning resets automatically once temperature rises by more than 2°C in 2 hours
Turn the heater OFF and back ON at the isolation switch
If it doesn't reset, contact Customer Service on 1300 412 612

I1 means the high NTC probe has detected a temperature above 95°C. This is a critical overtemperature warning. Contact Customer Service immediately on 1300 412 612.

I2 — The anti-bacterial cycle has started
I3 — The anti-bacterial cycle has completed

No action required. This is normal operation. The app will prevent mode or setting changes while the cycle is active. The heater returns to its previous mode once complete.

Turn the heater OFF at the isolation switch or meter box
Wait 30 seconds
Turn it back ON

Important: Turning off via the app is NOT sufficient — you must use the physical switch. The heater will enter pairing mode for 5 minutes but will revert to saved settings if no new input is received. If the error reappears, note the code and contact Customer Service on 1300 412 612.

No. If the electronic components inside the element cover experience high ambient temperature (e.g. from extreme sunlight), the heater may temporarily pause heating to protect the components and extend its lifespan. It will resume automatically once the temperature inside the cover returns to safe limits.

Test the Pressure & Temperature Relief (PTR) valve:

Stand clear of the drain pipe outlet
Lift the easing lever for approximately 10 seconds
Confirm water discharges through the drain pipe
Lower the lever gently and check it closes correctly
Repeat for the expansion control valve if fitted

This is the only owner-serviceable maintenance — do not remove any panels or covers.

A licensed tradesperson should:

Replace the PTR valve
Replace the sacrificial anode
Inspect and flush the expansion control valve (if fitted)
Drain and flush the water heater
Inspect the electrical conduit and cover

In areas with Total Dissolved Solids (TDS) exceeding 600 mg/L, this service is recommended every 3 years. Replacement parts are available from your local Reece branch.

A small amount of water discharge during heating cycles is normal — typically about 2% of the volume of water heated.

Continuous leakage may indicate a problem:

Excessive water supply pressure
Faulty PTR valve
Faulty thermostat

If the drip is continuous, turn off the heater and contact Customer Service on 1300 412 612.

Total Dissolved Solids (TDS): must be below 2,500 mg/L
pH level: must be between 6.5 and 9.5
Maximum water supply pressure: 800 kPa

In areas with TDS above 600 mg/L, a hard water model or aluminium alloy anode is recommended. Fit a pressure reducing valve if mains pressure exceeds 800 kPa.

Single family dwelling:

Tank — 10 years
Parts (Wi-Fi module, cable, thermostat, element) — 3 years
All other parts & labour — 1 year

All other applications:

Tank — 3 years
Parts & labour — 1 year

The warranty period starts from the date of installation, or the manufacturing date if proof of installation is unavailable.

Contact Customer Service:

Australia: 1300 412 612
New Zealand: 0800 081 909 or your local Reece branch

Have the following ready:

Proof of purchase
Model number (found on the compliance plate)
Description of the fault

The warranty does not cover defects resulting from:

Installation not in accordance with the manual or statutory requirements
Faulty plumbing or excessive water pressure
Improper power supply — including PV diverters that don't provide sinusoidal 230–240V AC 50Hz
Use contrary to the manual instructions
Water pH outside 6.5–9.5 or TDS above 2,500 mg/L
Unauthorised alterations or repairs
Accidental damage or abuse

No. Your warranty is not conditional on completing the recommended regular servicing. However, regular servicing will help extend the life of the heater and keep it operating safely and efficiently.

Common Questions