1. Introduction
This manual provides essential information for the safe and efficient operation of your MIZUDO 199K Tankless Water Heater. This unit is designed to provide on-demand hot water for large households, offering a maximum flow rate of 10.3 GPM and 199,000 BTU heating capacity. Please read all instructions carefully before installation and use.
2. Safety Information
Your MIZUDO tankless water heater is equipped with multiple safety features. Adhering to these guidelines is crucial for preventing property damage, injury, or death.
- Professional Installation: Installation, maintenance, and service must be performed by a qualified installer or service agency. Improper installation can lead to gas leaks, carbon monoxide poisoning, fire, or explosion.
- Gas Type: This appliance is designed for Liquid Propane (LP) gas only. Do not attempt to use natural gas or any other fuel type.
- Ventilation: This is an indoor direct vent unit. Ensure the venting system is correctly installed according to local codes and manufacturer instructions to safely exhaust combustion byproducts.
- Freeze Protection: The unit includes automatic anti-freeze protection down to -13°F. However, continuous power supply is required for this feature to function. In extremely cold climates or during power outages, additional measures may be necessary to prevent freezing.
- Integrated Safety Mechanisms: The unit features over 16 safety mechanisms, including flame failure detection, exhaust blockage protection, overheat protection, and dry fire prevention. Do not bypass or tamper with these systems.
- Water Pressure: Ensure water pressure remains within the specified operating range (maximum 150 PSI).
3. Product Features
The MIZUDO 199K Tankless Water Heater incorporates advanced technology for superior performance and efficiency:
- High Capacity: Delivers up to 10.3 Gallons Per Minute (GPM) of hot water, suitable for 5-7 fixtures simultaneously.
- Precision Temperature Control: Advanced 6-stage gas modulation technology maintains water temperature within ±1°F accuracy, preventing sudden temperature fluctuations.
- Ultra-Low NOx Combustion: Meets stringent environmental standards with emissions as low as 14 ng/J.
- Sealed Direct Vent System: Draws 100% outside air for combustion, preserving indoor air quality.
- Durable Construction: Features a phosphorous-deoxidized copper heat exchanger and stainless steel combustion chamber for longevity and corrosion resistance.
- Smart WiFi Connectivity: Remote monitoring and control via a dedicated mobile application.
- Advanced Anti-Freeze Protection: Built-in 100W power heating blocks activate automatically in low temperatures (down to -13°F) to prevent freezing.
Image: The MIZUDO unit maintains a stable hot water temperature, minimizing fluctuations.
Image: Internal components of the MIZUDO 199K Tankless Water Heater, highlighting the heat exchanger, smart control system, and 6-stage sectional burners.
4. Setup and Installation
Installation of this tankless water heater requires knowledge of plumbing, gas, and electrical systems. It is strongly recommended that installation be performed by a qualified professional.
4.1 Pre-Installation Checks
- Verify that the gas type (Liquid Propane) matches your supply.
- Ensure adequate clearance around the unit for ventilation and service.
- Confirm electrical supply is 120V AC, 60Hz.
4.2 Mounting
The unit is designed for wall mounting. Use the provided mounting hardware and ensure the wall can support the weight of the unit when filled with water.
Image: The compact design of the MIZUDO tankless water heater, with dimensions of 24.8" H x 15.9" W x 10.4" D.
4.3 Connections
All water and gas connections are 3/4" NPT. The direct vent system requires a 3"/5" concentric vent pipe.
- Cold Water Inlet: Connect the main cold water supply to the designated inlet.
- Hot Water Outlet: Connect the hot water outlet to your household plumbing.
- Gas Supply: Connect the Liquid Propane gas line to the gas inlet. Ensure all gas connections are leak-tested.
- Electrical: Plug the unit into a standard 120V, 60Hz grounded outlet.
Image: Connection points for the MIZUDO tankless water heater, including water, gas, and electrical.
5. Operating Instructions
Your MIZUDO tankless water heater is designed for user-friendly operation, primarily through its integrated control panel and smart mobile application.
5.1 Initial Startup
- After installation, ensure all gas and water lines are open and free of leaks.
- Turn on the electrical power to the unit.
- Open a hot water faucet in your home to allow water to flow through the unit. The heater will detect the flow and begin heating.
5.2 Temperature Adjustment
The water temperature can be adjusted directly on the unit's control panel or remotely via the MIZUDO mobile application. The temperature range is typically 95°F to 149°F.
Image: The unit's ability to maintain precise temperatures across different seasons, with a range of 95°F-149°F.
5.3 Smart WiFi Control
Download the MIZUDO application to your smartphone for remote management. The app allows you to:
- Adjust temperature settings.
- Create custom heating schedules.
- Monitor energy consumption.
- Receive maintenance alerts and notifications.
Image: The MIZUDO mobile application interface for smart control and monitoring of the water heater.
Download the app: https://a.smart321.com/fogattiandroidletsmart
6. Maintenance
Regular maintenance ensures the longevity and efficient operation of your tankless water heater. It is recommended to have a qualified technician perform annual inspections.
- Flushing: Periodically flush the heat exchanger to remove mineral buildup, especially in areas with hard water. Installing a 3/4 Inch IPS Isolator Tankless Water Heater Service Valve Kit can simplify this process.
- Vent System Inspection: Annually inspect the direct vent system for any blockages, leaks, or damage.
- Inlet Filter Cleaning: Check and clean the water inlet filter as needed to prevent debris from entering the unit.
- General Cleaning: Keep the exterior of the unit clean and free from dust and obstructions.
7. Troubleshooting
If you experience issues with your MIZUDO tankless water heater, refer to the following common troubleshooting steps. For complex problems, contact a qualified service technician.
7.1 No Hot Water / Insufficient Hot Water
- Check Power: Ensure the unit is receiving electrical power (120V AC).
- Check Gas Supply: Verify that the propane tank has fuel and the gas valve is open.
- Water Flow: Ensure sufficient water flow. The unit requires a minimum flow rate to activate.
- Temperature Setting: Confirm the desired temperature is set correctly on the unit or via the app.
- Error Codes: Check the unit's display for any error codes and consult the full manual for their meaning.
7.2 Water Temperature Fluctuations
- Inlet Water Temperature: Significant changes in incoming cold water temperature can affect output stability. The unit's 6-stage modulation helps mitigate this.
- Flow Rate: Ensure consistent water flow. Fluctuating flow can cause temperature changes.
- Mineral Buildup: Limescale in the heat exchanger can reduce efficiency and cause temperature instability. Refer to maintenance section for flushing.
7.3 Unit Not Turning On
- Power Supply: Confirm the unit is plugged in and the circuit breaker has not tripped.
- Gas Supply: Ensure the gas valve is open and there is propane in the tank.
- Water Flow Sensor: A faulty water flow sensor might prevent activation. This requires professional service.
8. Specifications
| Brand | MIZUDO |
| Model Number | WCIU-HW199A1G-LP-M0 |
| Heating Capacity | 199,000 BTU |
| Maximum Flow Rate | 10.3 Gallons Per Minute (GPM) |
| Temperature Range | 95°F - 149°F |
| Temperature Accuracy | ±1°F |
| NOx Emission | ≤14 ng/J |
| Venting System | Direct Vent (3"/5" Concentric) |
| Gas Type | Liquid Propane (LP) |
| Electrical Requirements | 120V AC, 60Hz, 52 Watts |
| Water Connections | 3/4" NPT |
| Maximum Pressure | 150 PSI |
| Dimensions (H x W x D) | 24.8" x 15.9" x 10.4" (63 cm x 40.4 cm x 26.4 cm) |
| Mount Type | Wall |
| Color | Gray |
9. Warranty and Support
MIZUDO stands behind the quality of its products.
9.1 Warranty Coverage
- Full Unit Warranty: 2 years from the date of purchase.
- Heat Exchanger Warranty: 10 years from the date of purchase.
Please retain your proof of purchase for warranty claims. The warranty card is included with your product.
9.2 Customer Support
For technical assistance, troubleshooting beyond this manual, or warranty service, please contact MIZUDO customer support. Refer to the contact information provided in your warranty card or on the official MIZUDO website.