A compact indoor solution for continuous hot water across multiple fixtures
Introduction
Hot water is no longer a luxury—it is a daily necessity in modern homes, apartments, and small multi-family spaces. From morning showers and dishwashing to laundry and cleaning, consistent access to hot water directly affects comfort, hygiene, and efficiency. Traditional tank-style water heaters often struggle to meet these demands due to limited capacity, standby heat loss, and long recovery times.
The MIZUDO Tankless Water Heater Propane Indoor, rated at 80,000 BTU with a maximum flow rate of 3.6 GPM, is engineered to eliminate these limitations. Designed for indoor installation and capable of supplying hot water to 2–3 fixtures simultaneously, this propane-powered unit delivers hot water on demand without the bulk or inefficiency of a storage tank.
Backed by MIZUDO, this system focuses on efficiency, safety, and long-term durability, making it suitable for whole-family use in homes or apartments where space and performance matter equally.
Product Overview
The MIZUDO propane tankless water heater is a compact indoor unit built to deliver continuous hot water whenever it is needed. Unlike conventional tank heaters, it heats water only when a hot water tap is opened, eliminating standby energy loss and ensuring a steady supply for multiple tasks.
With a 10-liter heating capacity, CSA certification, and an oxygen-free copper heat exchanger, the unit is optimized for efficiency, safety, and fast thermal response. Its self-modulating temperature control automatically adjusts gas usage based on water flow demand, balancing comfort with fuel savings.
Technical Specifications and Product Data
| Feature | Specification |
|---|---|
| Brand | MIZUDO |
| Water Heater Type | Tankless |
| Fuel Type | Liquid Propane |
| Capacity | 10 Liters |
| Maximum Flow Rate | 3.6 GPM |
| Heating Power | 80,000 BTU |
| Installation Type | Indoor |
| Product Dimensions | 13″W x 20.5″H x 7″D |
| Electrical Requirement | 120V |
| Water Connections | 3/4″ NPT |
| Heat Exchanger | Oxygen-Free Copper |
| Energy Factor | UEF > 0.81 |
| Certification | CSA Certified |
| Warranty | 2 Years Whole Unit, 5 Years Heat Exchanger |
Continuous Hot Water for Multi-Fixture Use
One of the strongest advantages of this unit is its ability to support 2–3 low-flow fixtures simultaneously. With a maximum output of 3.6 gallons per minute, the heater is well-suited for households that require hot water for more than one task at a time.
Practical Multi-Use Scenarios
- Shower and bathroom sink running together
- Kitchen sink and dishwasher operation
- Laundry washing with a nearby sink in use
- Two bathroom sinks operating concurrently
Hot water is delivered in approximately 10 seconds, reducing wait times and improving daily convenience for families and shared living spaces.
Energy-Efficient Tankless Operation
Unlike traditional tank heaters that continuously reheat stored water, the MIZUDO propane tankless water heater operates strictly on demand. Gas is consumed only when hot water is flowing, significantly reducing unnecessary fuel usage.
Efficiency Benefits
- No standby heat loss
- Lower propane consumption
- Reduced energy waste
- Improved operational efficiency
With a UEF greater than 0.81, this unit meets modern efficiency expectations while maintaining consistent performance.
Oxygen-Free Copper Heat Exchanger
At the core of the system is an oxygen-free copper heat exchanger, which offers superior thermal conductivity compared to standard steel components.
Advantages of Copper Heat Exchangers
- Faster heat transfer
- Improved heating response time
- Enhanced corrosion resistance
- Longer service life
This design allows water to reach the desired temperature quickly while maintaining durability under regular household use.
Self-Modulating Temperature Technology
The heater features temperature self-modulation, meaning it automatically adjusts propane input based on real-time water flow and temperature demand.
Why Self-Modulation Matters
- Stable water temperatures
- Reduced risk of overheating
- Optimized fuel consumption
- Enhanced user comfort
Whether one faucet or multiple fixtures are in use, the system adapts dynamically to maintain consistent output.
Compact Indoor Design
With dimensions of 20.5 inches high and 13 inches wide, the MIZUDO tankless water heater is compact enough for indoor installation in utility rooms, closets, or mechanical spaces.
Ideal Indoor Installation Locations
- Apartments and condos
- Small homes
- Utility closets
- Mechanical rooms
- Basement installations
The space-saving design makes it a practical replacement for bulky tank-style systems.
Integrated Safety and Protection System
Safety is a critical consideration for propane-powered appliances. This unit incorporates multiple built-in safeguards designed to protect both the system and the household.
Integrated Safety Features
- Automatic anti-freezing protection
- Leak detection system
- Overheat cutoff protection
- Wind-resistant ignition system
These protections work together to ensure stable operation under varying environmental and usage conditions.
Third-Party Safety Certification
The MIZUDO propane tankless water heater is CSA certified and UL listed, meeting recognized U.S. safety standards for gas appliances.
What Certification Means for Users
- Verified safety compliance
- Tested performance reliability
- Increased installation confidence
- Enhanced peace of mind
These certifications are particularly important for indoor propane installations.
Compatibility with U.S. Homes
This indoor unit is designed to align with common U.S. residential standards, making integration straightforward for professional installers.
Compatibility Highlights
- Operates on standard 120V power
- Uses 3/4″ NPT water connections
- Designed for indoor propane use
- Compact footprint for flexible placement
These features simplify installation while maintaining compliance with local building codes.
Warranty and Long-Term Support
MIZUDO provides 2 years of support for the complete unit and 5 years for the heat exchanger, reflecting confidence in the product’s durability and construction quality.
Warranty Advantages
- Reduced long-term ownership risk
- Coverage for critical components
- Added value for homeowners
This warranty structure supports long-term reliability and investment protection.
Performance in Everyday Use
In real-world applications, the heater delivers steady hot water with minimal temperature fluctuation. The fast ignition system ensures water is heated quickly, while the copper heat exchanger maintains consistent output even during extended use.
Users benefit from:
- Reliable hot water supply
- Smooth temperature transitions
- Quiet indoor operation
- Minimal maintenance requirements
The system performs particularly well in small to medium households with predictable hot water demand.
Comparison with Traditional Tank Water Heaters
Compared to conventional tank heaters, the MIZUDO tankless propane system offers several notable advantages:
- Unlimited hot water on demand
- Lower energy consumption
- Smaller installation footprint
- Reduced water waste
While tank heaters may still suit low-demand scenarios, tankless systems excel in efficiency and convenience.
Ideal Users and Applications
This propane tankless water heater is ideal for:
- Apartments with multiple occupants
- Small family homes
- Rental properties
- Compact living spaces
- Users seeking energy efficiency
It is especially beneficial where hot water demand overlaps across fixtures.
Maintenance and Longevity
Thanks to its copper heat exchanger and integrated protection systems, routine maintenance is minimal. Periodic inspection and professional servicing help maintain optimal performance over time.
The tankless design reduces mineral buildup compared to storage tanks, further enhancing longevity.
Final Verdict
The MIZUDO Tankless Water Heater Propane Indoor offers a balanced combination of efficiency, safety, and performance in a compact form. With 80,000 BTU of heating power, 3.6 GPM output, and advanced self-modulating technology, it is well-suited for households needing reliable hot water across multiple fixtures.
Backed by strong safety certifications and extended component support, this unit stands out as a practical, energy-conscious upgrade from traditional tank water heaters. For indoor propane users seeking continuous hot water without sacrificing space or efficiency, this model represents a dependable and well-engineered solution.