1. Safety Information
Read all instructions carefully before installation and operation. Failure to follow these instructions could result in property damage, personal injury, or death. This appliance must be installed by a qualified professional in accordance with all local codes and regulations.
Important Safety Features:
- Advanced Sealed Combustion System: Draws external air for combustion, preventing indoor air quality issues and ensuring no risk of CO leakage.
- CSA Certified: Ensures the unit meets established safety standards.
- Freeze Prevention: Automatic protection against freezing temperatures.
- Dry-Fire Safeguard: Prevents operation without water flow.
- Auto-Relight: Automatically reignites the burner if flame is lost.
- Flue Obstruction Detection: Shuts down the unit if the flue is blocked.
- Emergency Shutoff: Provides a mechanism for immediate shutdown in emergencies.
WARNING: Improper installation, adjustment, alteration, service, or maintenance can cause property damage, personal injury, or death. Consult a qualified installer, service agency, or the gas supplier for assistance.
CAUTION: Ensure proper ventilation and exhaust for the unit. Do not block air inlets or outlets.
Image: MIZUDO Tankless Water Heater displaying CSA certification and various safety features like IPX4 Waterproof, Dry-burning Prevention, Overheat Protection, Anti-freeze Protection, Time-out Shutdown, and Accidental Flameout Protection.
2. Product Overview
The MIZUDO 180k Propane Tankless Water Heater (Model HW180A0W-LP) provides on-demand hot water for residential use. Its compact design and advanced features ensure efficient and reliable performance.
Key Features:
- High Capacity: Delivers up to 7.9 GPM (Gallons Per Minute) of continuous hot water, suitable for 3 to 5 usage points simultaneously.
- High Efficiency: 180,000 BTU heat output with an oxygen-free copper heat exchanger for superior thermal conductivity and reduced heat loss.
- Smart Control: Wi-Fi and smartphone app control for remote monitoring and temperature adjustment.
- Precise Temperature Control: Maintains consistent hot water temperature with minimal fluctuation (±1°F).
- Space-Saving Design: Compact dimensions (25" x 16.3" x 7.3") require significantly less space than traditional tank heaters.
- Indoor Installation: Designed for indoor use with a sealed combustion system.
Product Components:
The MIZUDO tankless water heater consists of several key components working together to provide efficient hot water.
Image: Internal view of the MIZUDO Tankless Water Heater, illustrating the 180,000 BTU instant heating process with simultaneous automatic regulation of water and gas, highlighting low start-up flow rate, fast heating, and temperature stabilization.
- Oxygen-Free Copper Heat Exchanger: Maximizes heat transfer efficiency.
- Segmented Burner: Allows for precise flame intensity adjustment.
- High-Speed DC Blower: Ensures proper air intake and exhaust.
- Dual-Wall Direct Vent Pipe: Facilitates safe exhaust of combustion fumes and supply of outdoor oxygen.
- Control Panel: Digital display for temperature and status, with touch controls.
Image: Detailed internal view of the MIZUDO Tankless Water Heater, pointing out key components such as the Dual-wall Direct Vent Pipe, Oxygen-Free Copper Heat Exchanger, Segmented Burner, and High-Speed DC Blower.
3. Setup and Installation
Installation of the MIZUDO tankless water heater requires adherence to all local and national plumbing and gas codes. It is strongly recommended that installation be performed by a licensed professional.
Pre-Installation Checklist:
- Verify that the unit is suitable for your home's propane supply and water pressure.
- Ensure adequate space for installation, including clearances for ventilation and maintenance.
- Gather all necessary tools and additional components not included with the unit (e.g., valve kit, vent kit).
- Confirm electrical requirements: standard 120V power supply.
- Water connections: 3/4" NPT.
Installation Steps (Summary - Refer to full manual for details):
- Mounting: Securely mount the unit to a wall using the provided assembly kit and perforated paper for accurate placement.
- Ventilation: Install the dual-wall direct vent pipe system. This system draws fresh air from outside and exhausts combustion gases, maintaining indoor air quality.
- Water Connections: Connect the cold water inlet and hot water outlet using 3/4" NPT connections. Install a valve kit for isolation and maintenance.
- Gas Connection: Connect the propane gas supply to the unit. Ensure all gas connections are leak-free.
- Electrical Connection: Plug the unit into a standard 120V electrical outlet.
- Leak Check: Perform thorough checks for water and gas leaks.
- Initial Startup: Follow the initial startup procedure outlined in the comprehensive manual.
Image: Diagram illustrating typical installation points for the MIZUDO Tankless Water Heater in different household locations such as ensuite, laundry, bathroom, and kitchen, showing water inlet, gas inlet, water outlet, and electrical connection.
Image: Close-up view of the dual-wall direct vent pipe system, showing how it supplies oxygen from outdoors and exhausts combustion fumes to keep indoor air fresh.
4. Operating Instructions
Basic Operation:
- Power On: Ensure the unit is plugged in and the gas supply is open. The display will illuminate.
- Set Temperature: Use the '+' and '-' buttons on the unit's control panel to adjust the desired hot water temperature. The maximum temperature is 149°F.
- Hot Water Activation: Open any hot water faucet in your home. The unit will detect water flow (minimum activation flow 0.53 GPM) and begin heating instantly.
- Monitoring: The display will show the current outlet water temperature.
Image: MIZUDO Tankless Water Heater control panel with digital display and temperature adjustment buttons, illustrating precise temperature control.
Wi-Fi and App Control:
The MIZUDO tankless water heater can be controlled remotely via a smartphone application. This feature allows for convenient monitoring and adjustment from anywhere.
- Download App: Download the MIZUDO app from your smartphone's app store (available on iOS and Android).
- Pair Device: Follow the in-app instructions to connect your water heater to your home Wi-Fi network and pair it with your smartphone.
- Remote Functions:
- Switch the device on/off.
- Adjust the water temperature.
- Set ECO mode for energy saving.
- View consumption reports.
- Check troubleshooting information.
Image: Smartphone displaying the MIZUDO app interface for remote operation, showing options to switch devices on/off, adjust temperature, set ECO mode, and view consumption reports, with the water heater visible in the background.
Official Product Video:
Video: Official MIZUDO Indoor Tankless Water Heater 180K BTU product video, demonstrating features like Wi-Fi control, instant heating, temperature stability, sealed combustion, and multi-location suitability. (Duration: 0:46)
5. Maintenance
Regular maintenance ensures optimal performance and extends the lifespan of your MIZUDO tankless water heater. Always turn off the power and close the gas and water supply valves before performing any maintenance.
Annual Maintenance (Recommended by a Qualified Technician):
- Flushing: Flush the heat exchanger to remove mineral buildup (scale). This is crucial in areas with hard water.
- Vent System Inspection: Check the vent pipes for any obstructions, leaks, or damage.
- Gas Line Inspection: Verify gas connections are secure and free of leaks.
- Ignition System Check: Inspect the igniter and flame sensor for proper operation and cleanliness.
- Water Filter Cleaning: If applicable, clean or replace any inline water filters.
User Maintenance:
- Exterior Cleaning: Wipe down the exterior of the unit with a soft, damp cloth. Do not use abrasive cleaners.
- Freeze Protection: In freezing weather, ensure the unit and its water lines are protected to prevent damage. The unit has automatic freeze prevention, but additional measures may be necessary in extreme cold or during power outages.
Image: Illustration emphasizing the clean and hygienic waterway materials used in the MIZUDO water heater, contributing to water quality.
6. Troubleshooting
This section provides solutions to common issues. For complex problems or if you are unsure, contact a qualified technician or MIZUDO customer support.
| Problem | Possible Cause | Solution |
|---|---|---|
| No hot water / Unit not activating |
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| Water not hot enough |
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| Unit displays an error code | Specific internal fault | Refer to the full user manual for a list of error codes and their corresponding solutions. Contact customer support if the issue persists. |
| Water temperature fluctuates |
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7. Specifications
| Feature | Detail |
|---|---|
| Brand | MIZUDO |
| Model Number | HW180A0W-LP |
| Power Source | Liquid Propane |
| Heat Output | 180,000 BTU/hr |
| Flow Rate | Max 7.9 GPM |
| Minimum Activation Flow | 0.53 GPM (2 L/min) |
| Temperature Range | 95°F - 149°F |
| Electrical Requirements | 120 Volts, 43 Watts |
| Product Dimensions (W x H x D) | 16.3" x 25" x 7.3" |
| Item Weight | 39.6 Pounds |
| Water Connections | 3/4" NPT |
| Certification | CSA Certified |
| Special Features | Advanced Sealed Combustion System, Automatic Anti-Freeze Protection, Smart WiFi and App Control |
Image: Diagram detailing the MIZUDO Tankless Water Heater's dimensions, maximum gas consumption, temperature range, uniform energy factor, activation flow rate, power, and a list of included and to-be-purchased accessories (valve kit, vent kit).
GPM Flow Rate Chart (Outlet Water Temperature 110°F):
| Inlet Temp (°F) | GPM | Approx. Usage (Showers) |
|---|---|---|
| 37°F | 4.1 | 2 |
| 42°F | 4.4 | 2 |
| 47°F | 4.7 | 2 |
| 52°F | 5.2 | 2 |
| 57°F | 5.6 | 2 |
| 62°F | 6.2 | 3 |
| 67°F | 7.0 | 3 |
| 72°F | 7.9 | 4 |
| 77°F | 9.1 | 4 |
Note: Simultaneous shower use is based on a tankless set temperature of 110°F and a shower head flow rate of 2 GPM. Minimum flow may vary slightly depending on the temperature setting and the inlet water temperature.
8. Warranty and Support
MIZUDO stands behind the quality of its products. This water heater comes with a comprehensive warranty to ensure your peace of mind.
- Heat Exchanger Warranty: 5 years
- Comprehensive Unit Warranty: 2 years
For warranty claims, technical assistance, or to locate a qualified service technician, please contact MIZUDO customer support. Keep your purchase receipt and model number handy when contacting support.
Manufacturer: Mizudo
Contact Information: Refer to the contact details provided in your product packaging or on the official MIZUDO website.