1. Introduction
This manual provides essential information for the safe and efficient installation, operation, and maintenance of your Saunier Duval Opalia C11 gas water heater. Please read these instructions carefully before attempting any installation or operation. Retain this manual for future reference.
2. Safety Information
WARNING: Improper installation, adjustment, alteration, service, or maintenance can cause property damage, injury, or death. Read the installation, operating, and maintenance instructions thoroughly before installing or servicing this equipment.
- Professional Installation Required: The installation, commissioning, and servicing of this appliance must be carried out by a qualified and approved technician in accordance with all local and national regulations and standards.
- Gas Safety: This appliance uses natural gas. Ensure proper ventilation and check for gas leaks after installation. If you smell gas, immediately shut off the gas supply, open windows, and contact a qualified technician. Do not operate electrical switches or phones.
- Hot Water: The water heater produces hot water. Exercise caution to prevent scalding.
- Flammable Materials: Do not store or use flammable materials, gasoline, or other flammable vapors and liquids in the vicinity of this or any other appliance.
3. Product Overview and Components
Familiarize yourself with the internal components of your Saunier Duval Opalia C11 gas water heater. The diagram below illustrates the main parts.

1. Low-NOx Burner
2. Gas Valve
3. Heat Exchanger Body
4. Ignition (Piezo or Cyclo)
5. Cold Water Inlet
6. Domestic Hot Water Outlet
7. Gas Connection
8. Draft Hood
9. Generator (for Cyclo version)
Understanding these components is crucial for proper installation and maintenance.
4. Functional Diagram
The following schematic diagram provides an overview of the water heater's operational flow and key safety features.

1. Flue Gas Safety Probe (STL)
2. Draft Hood
3. Heat Exchanger Body
4. Combustion Chamber
5. Ignition Electrode (Generator)
6. Stainless Steel Burner
7. Gas Manifold
8. Generator
9. Water Valve
10. Cold Water Inlet
11. Gas Inlet
12. Hot Water Outlet
13. Gas Valve
This diagram illustrates the path of water and gas, as well as the location of critical sensors and valves.
5. Dimensions
Refer to the diagram below for the physical dimensions of the Opalia C11 unit, which are essential for planning installation space.

Height: 680 mm
Width: 350 mm
Depth: 313 mm
Flue Diameter: 110 mm
Ensure adequate clearance around the unit for ventilation, maintenance, and service access as specified in local regulations.
6. Installation
The Saunier Duval Opalia C11 gas water heater must be installed by a certified professional. This includes:
- Location Selection: Choose a suitable location with proper ventilation, access to gas and water lines, and a flue system.
- Mounting: Securely mount the unit to a wall capable of supporting its weight.
- Gas Connection: Connect the appliance to the natural gas supply. All gas connections must be leak-tested.
- Water Connections: Connect the cold water inlet and domestic hot water outlet.
- Flue System: Install the flue system to safely vent combustion gases outdoors.
- Commissioning: The technician will perform initial checks and adjustments to ensure safe and efficient operation.
7. Operating Instructions
The Opalia C11 features piezo ignition and a pilot light for operation.
- To Light the Pilot: Follow the instructions printed on the appliance or consult your installer. Typically, this involves pressing and holding a button while simultaneously activating the piezo igniter until the pilot flame is established.
- To Operate: Once the pilot light is lit, the main burner will ignite automatically when there is a demand for hot water (e.g., opening a hot water tap).
- Temperature Adjustment: If applicable, adjust the water temperature using the control knob on the unit. Refer to the markings for desired temperature settings.
- To Shut Down: To turn off the appliance completely, turn the gas control knob to the 'OFF' position. For temporary shutdown, you may turn off the pilot light if desired, or simply close the hot water taps.
Always ensure adequate ventilation during operation.
8. Maintenance
Regular maintenance is crucial for the longevity and safe operation of your water heater. It should be performed by a qualified technician annually.
- Annual Inspection: A qualified technician should inspect the burner, heat exchanger, flue system, gas connections, and water connections for wear, corrosion, or leaks.
- Cleaning: The burner and heat exchanger may require cleaning to ensure efficient combustion.
- Pilot Light: Ensure the pilot light flame is stable and correctly sized.
- Ventilation: Keep the area around the water heater clear of obstructions to ensure proper airflow.
9. Troubleshooting
If you experience issues with your water heater, consider the following common problems before contacting a technician:
- No Hot Water:
- Check if the pilot light is lit. If not, attempt to relight it according to the operating instructions.
- Ensure the gas supply valve is open.
- Check if the water supply is on.
- Insufficient Hot Water:
- The water heater may be undersized for demand, or the flow rate is too high.
- Mineral buildup in the heat exchanger can reduce efficiency. Professional cleaning may be required.
- Strange Noises:
- Banging or popping noises can indicate sediment buildup in the heat exchanger.
- Hissing sounds might indicate a leak. Immediately shut off water and gas and contact a technician.
- Gas Odor:
- IMMEDIATELY shut off the gas supply, open windows, and evacuate the premises. Do NOT operate electrical switches or phones. Contact your gas provider and a qualified technician from a safe location.
For any persistent or serious issues, always contact a qualified Saunier Duval service technician.
10. Specifications
| Feature | Specification |
|---|---|
| Model | Opalia C11Z |
| Reference Number | 0010022532 |
| Fuel Type | Natural Gas |
| Ignition Type | Piezo (with pilot light) |
| Energy Efficiency Class (ErP) | A |
| Hot Water Profile | M |
| Useful Power (Min) | 6.4 kW |
| Useful Power (Max) | 18.1 kW |
| Minimum Ignition Flow Rate | 2.3 l/min |
| Hot Water Flow Rate at Ignition | 11 l/min |
| Minimum Water Pressure | 0.13 bar |
| Flue Diameter | 110 mm |
| Dimensions (H x W x D) | 680 x 350 x 313 mm |
| Net Weight | 12.9 kg |
11. Warranty and Support
For warranty information, please refer to the documentation provided at the time of purchase or contact your retailer. Saunier Duval products are designed for reliability, but should you require technical assistance or service, please contact a certified Saunier Duval service partner or your installer. Always provide the model number (Opalia C11) and reference number (0010022532) when seeking support.