1. Johdanto
This manual provides essential information for the safe installation, operation, and maintenance of your MIZUDO Natural Gas Tankless Water Heater, Model HW180A0W-NG. Please read this manual thoroughly before installation and use, and retain it for future reference.
The MIZUDO HW180A0W-NG is an indoor, direct vent tankless water heater designed to provide continuous hot water for residential whole-house applications. It features a maximum flow rate of 7.9 GPM and a heat output of 180,000 BTU, along with Wi-Fi and app control capabilities.
Figure 1: MIZUDO HW180A0W-NG Natural Gas Tankless Water Heater, front view.
2. Turvallisuustiedot
Your safety and the safety of others are paramount. This appliance must be installed and serviced by a qualified professional in accordance with all local codes and regulations. Failure to follow these instructions could result in property damage, personal injury, or death.
2.1 Important Safety Features
- CSA-sertifioitu: This water heater is CSA approved, ensuring compliance with North American safety standards.
- Advanced Sealed Combustion System: Draws combustion air from outside, maintaining indoor air quality and preventing carbon monoxide leakage.
- Täysin suljettu rakenne: Enhances safety by preventing CO leakage into the living space.
- Freeze Prevention: Automatic protection against freezing temperatures.
- Dry-Fire Safeguard: Estää toiminnan ilman veden virtausta.
- Auto-Relight: Automatically attempts to reignite if the flame goes out.
- Flue Obstruction Detection: Shuts down the unit if a flue blockage is detected.
- Emergency Shutoff: Provides an immediate shutdown mechanism in case of malfunction.
- IPX4 vedenpitävä: Suitable for installation in environments where splashing water may occur, such as bathrooms.
Figure 2: CSA Certification and integrated safety protections.
3. Asennus ja asennus
Installation must be performed by a licensed professional. Ensure all local codes and regulations are met. This unit is designed for indoor installation with a direct vent system.
3.1 Sivuston vaatimukset
- Ilmanvaihto: Requires a dual-wall direct vent pipe to supply oxygen from outdoors and exhaust combustion fumes.
- Tila: The compact design (25" x 16.3" x 7.3") requires less space than traditional tank heaters. Ensure adequate clearance for servicing.
- Virtalähde: Standard 120V AC, 60Hz electrical outlet.
- Vesiliitännät: ¾" NPT connections for water inlet and outlet.
- Kaasuliitäntä: Ensure the gas line matches or exceeds the BTU rating of the unit (180,000 BTU).
3.2 Asennusvaiheet (yliview)
- Mount the unit securely on a wall using the provided assembly kit.
- Connect the water inlet and outlet lines.
- Connect the natural gas supply line.
- Install the direct vent system according to manufacturer instructions and local codes.
- Kytke laite 120 V:n vaihtovirtapistorasiaan.
- Perform leak checks and initial startup procedures as detailed in the full installation guide.
Kuva 3: Päättynytview of installation connections and potential indoor locations (Ensuite, Laundry, Bathroom, Kitchen).
Figure 4: Illustration of the dual-wall direct vent pipe, showing outdoor air intake and exhaust of combustion fumes.
4. Käyttöohjeet
The MIZUDO tankless water heater is designed for user-friendly operation, including smart control features.
4.1 Ensimmäinen käyttöönotto
After professional installation and verification of all connections, turn on the water supply, gas supply, and electrical power. The unit will perform a self-check and be ready for operation.
4.2 Lämpötilan säätö
The unit features precise temperature control to maintain a consistent hot water supply. The maximum temperature setting is 149°F. Adjust the temperature using the controls on the unit or via the smartphone app.
Figure 5: Temperature stability comparison, showing MIZUDO's precise ±1°F temperature control.
4.3 Wi-Fi- ja sovellushallinta
The MIZUDO tankless water heater can be controlled remotely via a smartphone application. This allows for:
- Switching the device on/off.
- Adjusting the water temperature.
- Setting ECO mode for energy efficiency.
- Viewing consumption reports.
- Accessing troubleshooting information.
Refer to the separate Wi-Fi setup guide for detailed instructions on connecting your device to the app.
Figure 6: Remote operation via smartphone app, showing temperature adjustment and consumption reports.
4.4 Flow Rate
The unit delivers up to 7.9 GPM of continuous hot water, supporting multiple usage points simultaneously. The minimum activation flow rate is 0.53 GPM (2 L/min).
Figure 7: Ground water temperature map and corresponding GPM usage chart for 110°F outlet water temperature.
5. Huolto
Regular maintenance ensures optimal performance and extends the lifespan of your water heater. It is recommended that a qualified technician perform annual inspections and maintenance.
5.1 Yleishoito
- Keep the area around the water heater clear of obstructions and flammable materials.
- Ensure the vent termination is free from blockages (e.g., snow, ice, debris).
- In freezing weather, ensure the water heater and its water lines are protected to prevent freezing.
5.2 Kestävä rakenne
The unit features an oxygen-free copper heat exchanger, which offers superior thermal conductivity, reduced heat loss, high efficiency, and durability. This material choice contributes to the longevity of the appliance.
6. Vianmääritys
If you experience issues with your water heater, refer to the following general guidelines. For complex problems or error codes, consult the full user manual or contact customer support.
- Ei kuumaa vettä: Check power supply, gas supply, and water flow. Ensure the minimum activation flow rate is met.
- Epäjohdonmukainen lämpötila: Verify the temperature setting. Ensure adequate water pressure and flow.
- Virhekoodit: If an error code appears on the display, refer to the detailed troubleshooting section in the complete manual for specific remedies.
- Alennettu virtaus: Check for sediment buildup in water lines or filters. Consider installing a water prefilter if water quality is a concern.
Always turn off the power and gas supply to the unit before attempting any inspection or repair.
7. Tekniset tiedot
Figure 8: Product dimensions, connection types, and a list of included and optional accessories.
| Ominaisuus | Erittely |
|---|---|
| Merkki | MIZUDO |
| Mallinumero | HW180A0W-NG |
| Polttoainetyyppi | Maakaasu |
| Suurin virtausnopeus | 7.9 gallonaa minuutissa (GPM) |
| Lämpöteho | 180,000 XNUMX BTU tunnissa |
| Voitage | 120 volttia |
| Wattage | 42 wattia |
| Maksimilämpötila | 149 Fahrenheit-astetta |
| Minimum Activation Flow Rate | 0.53 GPM (2 l / min) |
| Tehokkuus | High Efficient (Uniform Energy Factor: 0.81) |
| Tuotteen mitat | 27.14 x 16.3 x 7.3 tuumaa |
| Tuotteen paino | 39.6 kiloa |
| Asennustyyppi | Seinä |
| Vesiliitännät | ¾" NPT |
| Erikoisominaisuudet | Automatic Anti-Freeze Protection, Dual Direct Vent System, Stable Temperature Control, CSA Certified, Wi-Fi Control |
8. Takuutiedot
The MIZUDO tankless water heater comes with a comprehensive warranty to ensure your peace of mind:
- Lämmönvaihdin: 5 vuoden takuu.
- Kattava takuu: 2-year warranty covering other components.
Please retain your proof of purchase for warranty claims. For detailed terms and conditions, refer to the warranty card included with your product or contact MIZUDO customer support.
9. Asiakastuki
For technical assistance, warranty inquiries, or any questions regarding your MIZUDO tankless water heater, please contact our customer support team:
- Sähköposti: service@mizudo.com
- Puhelin: (781)-887-0291
Our team is available to provide support and ensure your satisfaction with MIZUDO products.
