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Ariston GL 4 S - User Manual

Ariston GL 4 S
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WE MAKE USE OF
RECYCLED PAPER
Bosch Thermotechnology Corp.
50 Wentworth Ave Londonderry,
NH03053
Tel. 866 330 2729
www.boschhotwater.com
Ariston Thermo SpA
Viale Aristide Merloni, 45
60044 Fabriano (AN)
Tel. 0732.6011
Telefax. 0732.602331
http://www.aristonthermo.com
E-mail: marketing@aristonthermo.com
Electric Mini Tank Water heaters
Chauffe-eau électriques à miniréservoir
Calentadores de Agua Eléctricos de Minitanque
GL 2.5 S - GL 4 S - GL 4 CA S - GL 6+ S
Made in China

Table of Contents

Questions and Answers

  • S
    Shelly StephensonAug 6, 2025
    Why is my Ariston GL 4 S Water Heater not getting hot?
    • J
      Joshua TurnerAug 6, 2025
      If your Ariston Water Heater isn't heating water, first ensure the power supply is on and working. If the indicator light doesn't illuminate, push in the reset button, referring to the previous section for steps. If the light works, test for plumbing crossover by shutting off the cold supply and opening the hot water tap; no water should flow. If flow continues, correct the crossover. If these steps don't resolve the issue, have a qualified technician test the heating element's resistance (8-10 ohms), replacing it if readings are outside this range.
  • A
    Anne RoyAug 12, 2025
    What to do if my Ariston GL 4 S Water Heater is leaking?
    • J
      Jessica GordonAug 13, 2025
      If your Ariston Water Heater is leaking, check the water fittings and the T & P fitting on top of the tank. Also, remove the front cover and inspect the heating element gasket. If the tank itself is leaking, and your heater is still under warranty, contact Bosch Water Heating for a warranty claim.
  • T
    tinaclarkAug 18, 2025
    Why is the water from my Ariston GL 4 S brown?
    • M
      Misty VegaAug 18, 2025
      Brown or rusty water from your Ariston Water Heater usually indicates a 'spent' anode rod. You should replace the anode rod.
  • S
    Sara JonesAug 25, 2025
    How to fix the light on my Ariston GL 4 S Water Heater?
    • J
      Jacob YoungAug 25, 2025
      If the light on your Ariston Water Heater isn't working, but the water still gets hot, the bulb may be faulty and need replacement. You should also check the reset button, following the steps outlined in the previous section.
  • B
    Brian GomezAug 30, 2025
    What to do if my Ariston GL 4 S Water Heater has odor in water?
    • A
      ashleyjamieAug 30, 2025
      Smelly water from your Ariston Water Heater might be due to a reaction between your local water and the heater's anode rod. You should check the anode rod, referring to the section on changing it.

Summary

IMPORTANT SAFETY INSTRUCTIONS

General Usage Safety

Key safety rules for operating the water heater, including grounding and proper installation.

Grounding Instructions

Specific guidance on connecting the water heater to a properly grounded outlet.

Technical Data

General Remarks and Safety

Model Specific Approvals

Notes that the GL 4 CA S model is approved only for installations in Canada.

Thermostat Pre-set Temperatures

Details factory pre-set thermostat temperatures for different models and certifications.

Hydrogen Gas Safety Precautions

Advises on the risks of hydrogen gas and necessary precautions during initial use.

Leak Damage Prevention

Emphasizes proper installation to prevent water damage from leaks, referencing codes.

Installation Instructions

Wall mounting

Instructions for securely mounting the water heater to the wall using the provided bracket.

Floor Mounting

Pipe Connections

Cold and Hot Water Connections

Guidance on connecting the cold water inlet and hot water outlet pipes to the unit.

GL 6+ S Horizontal Installation

Instructions for horizontal installation of the GL 6+ S model.

GL 6+ S Vertical Installation

Instructions for vertical installation of the GL 6+ S model.

Closed System Thermal Expansion

Preventing Thermal Expansion Issues

Recommendations to prevent pressure buildup due to thermal expansion in closed water systems.

Instructions for Use

Starting and Testing

Steps for filling the water heater, checking for leaks, and initial power-up.

Temperature Setting

How to adjust the water temperature using the control knob.

Maintenance Instructions

Periodic Maintenance Overview

Overview of periodic maintenance tasks for the water heater.

Removing the Cover

Step-by-step guide on how to remove the front cover for maintenance.

Draining the Heater

Procedures for safely draining water from the heater for maintenance.

Removing the Heating Element

Instructions for removing the heating element for inspection or replacement.

Replacement of Parts

Changing the Anode Rod

Guidance on inspecting and replacing the anode rod to prevent tank corrosion.

Changing the Heating Element

Steps for replacing the heating element, including gasket and connections.

Changing the Thermostat

Instructions for removing and replacing the thermostat unit.

Resetting High Limit Switch

How to reset the high temperature limit shut-off device and check thermostat operation.

Troubleshooting

Water Not Getting Hot

Steps to diagnose and resolve issues where the water is not heating properly.

Indicator Light Not On

Troubleshooting steps for when the indicator light is not functioning.

Brown Water Issues

Identifying and resolving the cause of brown or rusty water.

Odor in Water

Investigating and addressing unusual odors in the hot water.

Leaking Problems

Procedures for identifying and fixing leaks from fittings or the tank.

Warranty Information

Warranty Coverage Details

Defines the warranty coverage provided by the manufacturer for the water heater.

Warranty Period Specification

Specifies the duration of the warranty for the inner tank and other component parts.

Warranty Exclusions

Lists conditions and situations that are excluded from the limited warranty coverage.

How to Secure Service or Claim

Outlines the procedure for owners to obtain service or file a warranty claim.

Ariston GL 4 S Specifications

General IconGeneral
TypeElectric
Capacity4 liters
Power1.2 kW
Voltage230 V
Pressure resistance8 bar
Heating elementCopper
ThermostatAdjustable
Safety FeaturesOverheat protection
Thermal insulationPolyurethane
InstallationVertical
Connection1/2 inch

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