1. Wprowadzenie
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. Informacje dotyczące bezpieczeństwa
Your MIZUDO tankless water heater is equipped with multiple safety features. Adhering to these guidelines is crucial for preventing property damage, injury, or death.
- Profesjonalna instalacja: 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.
- Typ gazu: This appliance is designed for Liquid Propane (LP) gas only. Do not attempt to use natural gas or any other fuel type.
- Wentylacja: 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.
- Ochrona przed zamarzaniem: 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.
- Zintegrowane mechanizmy bezpieczeństwa: The unit features over 16 safety mechanisms, including flame failure detection, exhaust blockage protection, overheat protection, and dry fire prevention. Do not bypass or tampz tymi systemami.
- Ciśnienie wody: Ensure water pressure remains within the specified operating range (maximum 150 PSI).
3. Funkcje produktu
The MIZUDO 199K Tankless Water Heater incorporates advanced technology for superior performance and efficiency:
- Duża pojemność: Delivers up to 10.3 Gallons Per Minute (GPM) of hot water, suitable for 5-7 fixtures simultaneously.
- Precyzyjna kontrola temperatury: Zaawansowane 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.
- Trwała konstrukcja: Features a phosphorous-deoxidized copper heat exchanger and stainless steel combustion chamber for longevity and corrosion resistance.
- Inteligentna łączność WiFi: 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. Konfiguracja i instalacja
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 Kontrole przed instalacją
- 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 Montaż
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 Połączenia
All water and gas connections are 3/4" NPT. The direct vent system requires a 3"/5" concentric vent pipe.
- Wlot zimnej wody: Connect the main cold water supply to the designated inlet.
- Wylot ciepłej wody: Connect the hot water outlet to your household plumbing.
- Dostawa gazu: Connect the Liquid Propane gas line to the gas inlet. Ensure all gas connections are leak-tested.
- Elektryczna: 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. Instrukcja obsługi
Your MIZUDO tankless water heater is designed for user-friendly operation, primarily through its integrated control panel and smart mobile application.
5.1 Pierwsze uruchomienie
- After installation, ensure all gas and water lines are open and free of leaks.
- Włącz zasilanie elektryczne urządzenia.
- 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 Regulacja temperatury
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 Inteligentne sterowanie WiFi
Download the MIZUDO application to your smartphone for remote management. The app allows you to:
- Dostosuj ustawienia temperatury.
- Create custom heating schedules.
- Monitoruj zużycie energii.
- Receive maintenance alerts and notifications.

Image: The MIZUDO mobile application interface for smart control and monitoring of the water heater.
Pobierz aplikację: https://a.smart321.com/fogattiandroidletsmart
6. Konserwacja
Regular maintenance ensures the longevity and efficient operation of your tankless water heater. It is recommended to have a qualified technician perform annual inspections.
- Płukanie: 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.
- Kontrola systemu wentylacyjnego: Annually inspect the direct vent system for any blockages, leaks, or damage.
- Czyszczenie filtra wlotowego: Check and clean the water inlet filter as needed to prevent debris from entering the unit.
- Ogólne sprzątanie: Keep the exterior of the unit clean and free from dust and obstructions.
7. Rozwiązywanie Problemów
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
- Sprawdź moc: Ensure the unit is receiving electrical power (120V AC).
- Sprawdź dostawę gazu: Sprawdź, czy w zbiorniku z propanem znajduje się paliwo i czy zawór gazowy jest otwarty.
- Przepływ wody: Zapewnij odpowiedni przepływ wody. Do aktywacji urządzenie wymaga minimalnego przepływu.
- Ustawienie temperatury: Confirm the desired temperature is set correctly on the unit or via the app.
- Kody błędów: Check the unit's display for any error codes and consult the full manual for their meaning.
7.2 Water Temperature Fluctuations
- Temperatura wody wlotowej: Significant changes in incoming cold water temperature can affect output stability. The unit's 6-stage modulation helps mitigate this.
- Przepływ: Ensure consistent water flow. Fluctuating flow can cause temperature changes.
- Nagromadzenie minerałów: Limescale in the heat exchanger can reduce efficiency and cause temperature instability. Refer to maintenance section for flushing.
7.3 Jednostka się nie włącza
- Zasilanie: Confirm the unit is plugged in and the circuit breaker has not tripped.
- Dostawa gazu: 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. Specyfikacje
| Marka | MIZUDO |
| Numer modelu | WCIU-HW199A1G-LP-M0 |
| Moc grzewcza | 199,000 BTU |
| Maksymalna szybkość przepływu | 10.3 galona na minutę (GPM) |
| Zakres temperatur | 95°F - 149°F |
| Dokładność temperatury | ±1°F |
| NOx Emission | ≤14 ng/J |
| System wentylacyjny | Direct Vent (3"/5" Concentric) |
| Typ gazu | Ciekły propan (LP) |
| Wymagania elektryczne | 120V AC, 60Hz, 52 Watts |
| Połączenia wodne | 3/4" NPT |
| Maksymalne ciśnienie | 150 PSI |
| Wymiary (wys. x szer. x gł.) | 24.8" x 15.9" x 10.4" (63 cm x 40.4 cm x 26.4 cm) |
| Typ mocowania | Ściana |
| Kolor | Szary |
9. Gwarancja i wsparcie
MIZUDO stands behind the quality of its products.
9.1 Zakres gwarancji
- Pełna gwarancja na jednostkę: 2 lata od daty zakupu.
- Gwarancja na wymiennik ciepła: 10 lata od daty zakupu.
Please retain your proof of purchase for warranty claims. The warranty card is included with your product.
9.2 Obsługa klienta
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 webstrona.