1. Introduction and Product Overview
Thank you for choosing the SNDOAS Tankless Hot Water Heater. This manual provides essential information for the safe and efficient installation, operation, and maintenance of your new appliance. This unit is designed to provide instant and continuous hot water for your household needs, operating on natural gas with a forced exhaust system for indoor use.
The SNDOAS Tankless Hot Water Heater delivers up to 4.23 GPM (16 L/min) flow rate, making it suitable for whole-house applications, effortlessly handling multiple showers and appliances simultaneously without waiting for water to heat up. It features an oxygen-free copper heat exchanger for rapid heating and excellent thermal efficiency, along with a smart LED display for real-time temperature and usage monitoring. The unit maintains water within ±2°F of your set point (95°F–149°F).
The SNDOAS Tankless Hot Water Heater, a compact black unit designed for indoor use, featuring an intuitive LED display on its front panel.
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.
- This appliance must be installed by a qualified professional in accordance with all local codes and regulations.
- Ensure adequate ventilation and proper exhaust system installation to prevent carbon monoxide buildup.
- Do not store flammable materials near the water heater.
- This unit operates on natural gas only. Do not attempt to use propane or any other fuel type.
- Always disconnect power and shut off the gas supply before performing any maintenance or service.
3. Product Features
- High-Efficiency On-Demand Hot Water: Delivers 4.23 GPM (16 L/min) for continuous hot water.
- Forced Exhaust System: Safely vents combustion gases outside, preventing CO buildup.
- Natural Gas Operation: Designed exclusively for natural gas, ensuring consistent performance.
- Copper Heat Exchanger: Oxygen-free copper for rapid heating and thermal efficiency.
- Precise Temperature Control: Smart LED display with temperature control within ±2°F (95°F–149°F).
- Quiet Operation: Runs quietly, suitable for indoor spaces like kitchens or bathrooms.
- Wall-Mounted Design: Compact and mounts neatly on any wall.
- User-Friendly Interface: Intuitive panel displays temperature, settings, error codes, and consumption.
The 4.23 GPM flow rate of this tankless gas water heater is sufficient to meet continuous hot water demands for various household uses, including bathroom sinks, kitchen faucets, and bathing.
The system provides continuous hot water on demand, capable of supplying 2-3 outlets simultaneously with consistent temperature and instant heating, suitable for whole-house applications.
4. Installation
Installation of this tankless water heater requires knowledge of plumbing, gas, and electrical systems. It is highly recommended that installation be performed by a licensed professional to ensure safety and compliance with all local codes.
4.1. Mounting the Unit
Select a suitable indoor location with adequate ventilation. The unit must be mounted vertically on a sturdy wall capable of supporting its weight. Ensure there is sufficient clearance around the unit for maintenance and proper airflow.
This image illustrates the compact dimensions of the tankless water heater, measuring 13.78 inches in width and 21.65 inches in height, allowing for space-saving installation.
4.2. Gas Connection
Connect the natural gas supply line to the 'GAS INLET' port on the unit. Ensure all gas connections are tight and leak-free. This unit is designed for natural gas only.
4.3. Water Connections
Connect the cold water supply line to the 'WATER INLET' port and the hot water output line to the 'WATER OUTLET' port. Use appropriate plumbing fittings and ensure all connections are secure to prevent leaks.
4.4. Electrical Connection
Plug the unit into a standard 120V/60Hz electrical outlet. The unit comes with a 3-prong plug. Ensure the outlet is properly grounded.
The user-friendly touch control panel features power and temperature adjustment buttons, powered by a standard 3-prong plug for easy electrical connection.
4.5. Exhaust System
Install the provided exhaust pipe to safely vent combustion gases outside. This is a forced exhaust unit, and proper venting is critical for safety. Do not vent into an enclosed space.
This diagram illustrates the wall-mounted design for indoor installation, emphasizing the forced exhaust system that safely vents combustion gases outdoors.
This diagram details the connections for the water outlet (1/2 NPT), gas inlet (1/2 NPT), water inlet (1/2 NPT), and power cord, highlighting the importance of positioning the unit in a well-ventilated area for safe and efficient operation.
5. Operating Instructions
5.1. Initial Startup
- Ensure all gas and water connections are secure and leak-free.
- Open the cold water supply valve to the unit.
- Open a hot water faucet in your home to purge air from the water lines. Close the faucet once water flows steadily.
- Turn on the gas supply to the unit.
- Plug the power cord into the electrical outlet.
5.2. Setting Temperature
Use the touch control panel on the front of the unit to adjust the desired water temperature. The LED display will show the current temperature setting. Press the 'Warm up' (up arrow) or 'Cool down' (down arrow) buttons to adjust. The temperature range is 95°F to 149°F.
Enjoy instant hot water without preheating, providing hot water on demand and saving time, as depicted by a person relaxing in a bathtub.
6. Maintenance
Regular maintenance ensures the longevity and efficient operation of your tankless water heater. Always turn off the power and gas supply before performing any maintenance.
- Annual Inspection: Have a qualified technician inspect the unit annually, including the heat exchanger, burner, and exhaust system.
- Ventilation Check: Ensure the exhaust vent is clear of obstructions and the area around the unit is well-ventilated.
- Cleaning: Periodically clean the exterior of the unit with a soft, damp cloth. Do not use abrasive cleaners.
- Water Filter (if applicable): Check and clean any inline water filters to prevent sediment buildup.
- Descaling: In areas with hard water, periodic descaling of the heat exchanger may be necessary to maintain efficiency. Consult a professional for this service.
7. Troubleshooting
If you encounter issues with your water heater, refer to the following common troubleshooting steps. For complex problems, contact a qualified technician.
| Problem | Possible Cause | Solution |
|---|---|---|
| No hot water | No power, no gas, water supply off, error code | Check power/gas supply, open water valve, check LED display for error codes and consult manual. |
| Low hot water flow | Sediment buildup, clogged filter, low water pressure | Clean water filter, descale unit (professional service), check household water pressure. |
| Water not hot enough | Temperature setting too low, high flow rate, cold inlet water temperature | Increase temperature setting, reduce flow rate at faucet, consider colder incoming water. |
| Unit displays error code | Specific malfunction | Refer to the error code section in the full manual (if available) or contact customer support. |
8. Specifications
Detailed specifications highlight the unit's performance, including a 4.23 GPM hot water output, 85,300 BTU/hr maximum input, and a temperature range of 95°F to 149°F.
| Feature | Value |
|---|---|
| Brand | SNDOAS |
| Model Number | IF.JSQ25-B13NA |
| Power Source | Natural Gas |
| Product Dimensions (W x H) | 13.8"W x 21.6"H |
| Special Feature | LED Display |
| Color | Black |
| Voltage | 120 Volts |
| Flow Rate | 4.23 Gallons Per Minute |
| Maximum Temperature | 149 Degrees Fahrenheit |
| Heat Output | 85300 British Thermal Units |
| Efficiency | High-Efficiency |
| Mount Type | Wall |
| Is Electric | No (refers to primary heating source, unit requires 120V for controls) |
| Included Components | Touch Control, Exhaust Pipe, Showerhead |
9. Warranty and Support
SNDOAS products are manufactured to high-quality standards and are backed by a manufacturer's warranty. For specific warranty details, please refer to the warranty card included with your product or visit the official SNDOAS website.
For technical support, troubleshooting assistance, or to inquire about replacement parts, please contact SNDOAS customer service. Contact information can typically be found on the product packaging, in the included documentation, or on the brand's official website.