• Both instant and storage water heaters generate hot waters, but their attributes and features differ.
• There are 3 types of instant electric water heaters: mechanical, electronic and digital. The mechanical kind is the least expensive and features step-less control. Electronic type lets you control the power setting while digital type comes with a temperature display panel besides having power setting control. The instant water heater operates with a 3.3kw element and generally works for individual supply points, therefore if you have 2 bathrooms, you will need 2 instant water heaters. Unlike storage water heater, instant water heater does not require pre-heating before using as it generates hot water instantly. The water temperature can vary according to the water pressure. For example, if water pressure is low, the water temperature will go up and vice versa. The average life span for an instant water heater is around 3 to 5 years.
• A storage water heater has an inner tank for storage of water. The capacities range from 15 litres to 100 litres. The inner tank can be made with stainless steel or enamel coating. It operates with a 1.5kw to 3kw element and can supply hot water to more than one point (multi-point system), which means that it can supply hot water to more than 1 bathroom as well as kitchen simultaneously. A mixer is used to regulate and provide constant water temperature so it is not affected by the change in water pressure. However, the water stored need to be pre-heated before used. To save energy and prevent loss of heat, insulation is placed between the storage tank and outer casing of the heater. A storage water heater also comes with an automatic thermostat to cut off the power supply when it reaches the preset temperature. Therefore the additional electricity consumption for switching the heater on the whole day is negligible. The average life span for a storage water heater is around 5 to 7 years.

Formula for calculation of electricity consumption:

Electricity cost = Power (kw) x Usage Time (hr) x Electrical Tariff

The following is a simple illustration of the consumption of 2 types of heaters on the basis of 2 users.

Assumption:
User 1 & 2 – uses 5 minutes of hot water each
User 3, 4 & 5 – uses 3 minutes of hot water each
Total: 19 minutes hot water required
Electrical tariff (dated Oct – Dec 2023) – S$0.2996

Electricity Consumption:
Instant water heater : 3,3kw x 19/60 x S$0.2996 = S$0.313
Storage water heater : 1.5kw x 70/60 x S$0.2996 = S$0.524

The above calculation does not take into consideration of other factors such as capacity of water heater, frequency of bath per user and original temperature of water in the tank.

For instant water heater, the recovery of hot water is instant.

The recovery rate for storage water heater varies according to the power of the heater.

Initial recovery rate:
a) Inlet temperature = 25 deg C
b) Bathing temperature = 42 deg C

Recovery rate gallon/hour (Small capacity – 1.5kw )
= Andris2/Andris Lux WI-FI/ Andris LUX-D WI-FI/ Andris 2 TOP WI-FI (1500 x 860) / (42-25) x 60
= 1.3 litres / min

Recovery rate gallon/hour (Bigger capacity – 2.5kw)
= Andris Slim (SL)/ PRO1 R/ PRO1 R Inox/PRO R Slim / PRO RS J (2500x 860) / (42-25) x 60
= 2.1 litres / min

The following is a simple illustration on how to size and select a proper water heater.

Assumptions:

1. Normal bathing temperature = 40 deg C.
2. Cold water inlet temperature = 25 deg C.
3. Ariston maximum temperature setting = 70 deg C.

Calculation of % of hot water required when mix with cold water:

[(mixed water) – (cold water)] / [(hot water) – (cold water)]
= [40 – 25] / [70 – 25]
= 15 / 45
= 33% of mixture is hot water (for Ariston heater)

Amount of mixed water produced at temperature 40ºC:

Ariston ( 30 litres ):
33/30 = 100/x
x = 91 litres

Ariston ( 50 litres ):
33/50 = 100/x
x = 152 litres

From the sizing program, we understand that the amount of the warm water (40 deg C) produced for bathing is not only depended on the capacity of the tank but also the pre-set temperature.

The following may be used as a reference guide in determining a proper storage water heater for your home:

1. Usage Description / per bathroom: Sink
   Proposed Ariston model: ANDRIS LUX WI-FI 15, Andris2 15 series.
2. Usage Description / per bathroom: Shower & basin
   Proposed Ariston model: ANDRIS LUX WI-FI 30, Andris2 30 series, Andris Slim (SL2) series, PRO R S 30, PRO R S 40, PRO R S 56, PRO1 R Inox series, PRO RS J series.
3. Usage Description / per bathroom: Bathtub & basin
   Proposed Ariston model:  PRO R S 80.
4. Usage Description / per bathroom: Corner bathtub & basin
   Proposed Ariston model: PRO R S 100.

Routine preventive maintenance of water heater can provide you many years of trouble-free heater. There are several points which you should take note:

1.Keep free from gasoline or other flammable or combustible materials around the vicinity area of the water heater.

2.It is not uncommon for the water heaters to generate hissing noise when in operation, even for the new heater. However, you should contact your professional plumber or our service center should the hissing or the noise level increases substantially as this noise may be caused by the heating element which required cleaning.

3.The purpose of magnesium anode is to neutralize stray galvanic currents, thus preventing corrosion. Therefore, it is advisable to replace the magnesium anode in the Andris2 series, SL/ SL2 series, PRO R Slim series, PRO1 R Inox series and PRO RS J series regularly, e.g. bi-yearly. Please call our service center for providing this service with charge.

The Ariston NET app enables you to control your product from remote, wherever you are. This means that you can switch ON/OFF, change temperature and be informed in real time of everything happens to the product from everywhere and always at your fingertips.
The esiest way to control your product and save energy and money up to 25%.

You can download the free-of-charge Ariston NET app from any app store on your smartphone (The Apple Store and the Google Play Store). Ariston NET is available for iOS and Android operating systems.

If you have forgotten your password for accessing the service, you may request it to be sent to your email address under the “Login” section of the app. A new password will then be sent to your email address.

You must repeat the network configuration procedure so that the product can communicate with the app through the Wi-Fi connection. You can always refer to the installation manual and the quick start guide included.

The Ariston NET App allows the multi plant control. Look for the button in the settings app page.

It’s possible that more than one user can login in from different devices with the same account. Download the app and use only one account user name and password.

Of coure no, it’s just needed to download the app and use the credetials (user name and password) of the available account.

For sure not, the product will be automatically re-connected to the Wi-Fi network as soon as the power will be on.

There are three safety features:

1. Thermostat
   First level safety feature. It is of precise control of the water temperature by the user. And stop the heating process when it reaches the desired temperature.
2. Thermal cut-out
   In case of over-heating, in the event whereby thermostat fails to work, the second sensor in the thermal cut-out provide an all-pole disconnection to the appliance from the electric supply.
3. Pressure relief valve
   The valve shall be directly fitted in the inlet. The function is to prevent an excessive rise of pressure in the water tank. When pressure exceeds the 8 ± 0.5 bars, the spring in the valve will be depressed in the opposite direction to release the pressure and water will start to drip through the 4.5mm outlet on one side of the valve. This outlet should be discharge to the drainage system.

1) Thermostat is not fitted properly on the heating element?
Remove and fit correctly.

2) Thermal cut-out activated?
Reset the safety device.

3) Electric switch not ON?
Turn ON the switch.

4) Electric heating element cut-off or short-circuited?
Replace the heating element and the gaskets.

5) No power supply?
Check the continuity on the power supply cables, plugs and connection terminals.

1) No power supply?
Check the continuity of the power supply cables and connection terminals.

2) Defective thermal cut-out?
Replace thermal cut-out.

3) Defective electronic card?
Replace electronic card.

1) Defective thermostat?
Replace the thermostat.

2) Too much calcium or mud on the tank?
Remove the calcium or mud.

1) Bacteria in the water?
Drain, clean and rinse the inner tank.

2) Water temperature is too low?
Turn the thermostat to “maximum”.

1) Excessive formation of lime or scale on the heating element?
Clean the heating element.

2) Thermal effect on the current thermostat?
No action should be taken if this occurs at the end of the heating cycle. Replace the thermostat if it occurs at the beginning of the heating cycle.

1) Hard water.
Descale.

2) Natural effect due to micro-boiling of the water over the heating element.
Replace the heating element with anti-noise model.

1) Due to different water flow and pressure in the system which may cause noise when cold water is drawn.
Replace the valve with anti-noise model.

2) Pipes too narrow.
Increase diameter.

1) Incorrect electrical power setting.
Check the power setting, modify the protection.

2) Resistance is earthed.
Test it and if necessary, replace it.

1) Defective valve or too much pressure.
Replace or install pressure reducer.

1) Boiler perforation due to corrosion by aggressive water.
Replace water heater.

1) Power supply failure?
Check incoming power supply to the heater and ensure selector knob is at “ON” mode.

2) Insufficient water flow rate to activate flow switch/ sensor?
Refer to problem on “low flow rate”.

3) Defective components?
Replace components.

4) Heating/ELCB/Safety check indicator “blinking” or “not lighted”? Call for service.

5) Overheating , due to higher inlet water temperature?
Adjust the temperature settings higher.

1) Stop cock valve is at close position?
Open stop-cock valve to fully open position.

2) Low water pressure at the inlet?
Ensure that 0.15 bar of minimum water pressure.

3) Mesh filter is jammed?
Remove and clean up mesh filter.

4) Debris in hand shower, twisted flexible hose?
Descale the hole with a soft brush.

If you switch off the product by ON/Off button, the ECO function continues to maintain memory.
If you stop the electricity of the product, the ECO function continues to maintain memory for 2 hours.