Tankless Water Heater Propane, MIZUDO Indoor Installation Max 5.1 GPM 120,000 BTU On Demand Hot Water Heater, CSA Certified Constant Temp High Power for 2-3 Fixtures Big Family or Business, Gen 2
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Friday, Aug 21
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Material Type: 5.1 GPM, 120,000 BTU, indoor
Style: Propane Gas
Features
- Upgraded Temp Control: Mizudo Gen 2 water heater will self-modulate water temp by the interaction between the gas proportional valve, water volume servo and built-in chip to ensure that the temperature difference is within 1F, provide you with a constant temperature and comfortable bathing experience
- Endless Huge Hot Water: Tankless water heater delivers up to 5.1 GPM at 120000 BTU, ideal for running 3 showers simultaneously in big house with 2-3 bathrooms; Only sonsumes gas when during using, no standby waste, will save up to 20% gas bills
- Quality & Compliance: All our tankless water heaters propane are UL listed and CSA certified meeting all US safety codes. We also provide 2-year support for the whole unit and 5-year support for the oxygen-free copper heat exchanger
- Safety Protections: This propane tankless water heater is provided with windproof, waterproof and protections of leakage, overheate, anti-freeze, dry-combution and so on. Extend service life and improve safety, prevents 80% of common tankless failures
- Product Information: The propane tankless water heater indoor is 22.76 x 14.57 x 7.0 inches, support indoor installation only; Propane powered and LED screen control. Uses 120V power and 3/4" NPT connectors, compatible with most US homes. UEF>0.81 exceeds DOE baseline
Brand: MIZUDO
Capacity: 5.1 Gallons
Power Source: Liquid Propane
Product Dimensions: 14.57"W x 22.76"H
Special Feature: 2 Years Support for Whole Unit, 5 Years Support for Heat Exchanger, Automatic Anti-Freezing Protection, CSA Certificated, Upgraded Temp Control See more
Brand: MIZUDO
Product Dimensions: 14.57"W x 22.76"H
Special Feature: 2 Years Support for Whole Unit, 5 Years Support for Heat Exchanger, Automatic Anti-Freezing Protection, CSA Certificated, Upgraded Temp Control
Color: White
Wattage: 37 Watt-hours
Voltage: 120 Volts (AC)
Maximum Flow Rate: 5.1 Gallons Per Minute
Maximum Temperature: 121 Degrees Fahrenheit
Heat Output: 120000 BTU per Hour per Foot per Degree Fahrenheit
Efficiency: Energy Efficient
Maximum Operating Pressure: 150 Pound per Square Inch
Mounting Type: Wall
Is Electric: No
Manufacturer: Mizudo
Item Depth: 7.0 inches
Item Weight: 30.6 pounds
Item model number: FDG-CS120BW-LP
Item Package Quantity: 1
Special Features: 2 Years Support for Whole Unit, 5 Years Support for Heat Exchanger, Automatic Anti-Freezing Protection, CSA Certificated, Upgraded Temp Control
Included Components: Gas Water Hetaer x 1, Manual x 1, Perforated Paper x 1, Assembly Kit x 1, Warranty Card x 1
Batteries Included?: No
Batteries Required?: No
Date First Available: January 13, 2024
Frequently asked questions
If you place your order now, the estimated arrival date for this product is:
Friday, Aug 21
This item is non-returnable:
Non-returnable. Transportation of this item is subject to hazardous materials regulation
View our full returns policy here.
Non-returnable. Transportation of this item is subject to hazardous materials regulation
View our full returns policy here.
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Top Amazon Reviews
Material Type: 3.6 GPM, 80,000 BTU, indoor
Style: Propane Gas
UPDATE: I have abused this machine for almost a month now running it at max temperature taking 2 10 minute showers each day between me and my partner. It is extremely efficient, we use small 5 gal propane tanks that and they last roughly 2-3 weeks of us using them a lot. We also hand wash our dishes and it still manages to last super long. This is one of the few indoor built instant propane water heaters on this app and website. It does not disappoint, the price tag reflects the quality. It gives instant hot water and works amazingly as advertised. I've been using this for showers over the past week and it works great. It is super easy to mount and although it doesn't come with the fittings and proper connections for gas or water you can easily find these at your local hardware store. It will cost a little extra but I guarantee after you try it you will love it. I have this unit mounted in my camper that I live inside all year around and it is the greatest upgrade I've done to this place.
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Reviewed in the United States on March 29, 2024 by Ian Z.
Material Type: 5.1 GPM, 120,000 BTU, indoor
Style: Propane Gas
I installed this in the cabin we live in about a month ago and so far it's been working well for us. The distance from the heater to the various taps is fairly short and there is a bit of a lag getting hot water to the outlets,but I believe that is more of a result of the "water saving" fixtures we are stuck with these days and their flow restrictive nature. Water temp fluctuations have been minimal. Though we have noticed some due to the lower temp of the incoming water to the heater after the water has run for a period of time. We have very cold water from our well. The unit is a little noisy,but that is far from our concerns. My only real concern is the water heater cycling when running the washing machine when set to a warm wash temperature. It runs for such a short period that the water doesn't really get an opportunity to heat and I feel like the rapid cycling is probably not good for the heater. I feel this is more of an issue with the washer than the heater. Our solution was to run the washer on a hot setting and reduce the temperature on the water heater. Right now we just have a whole house filter installed in the inlet. We did have a Water Drop scale inhibitor installed,but it leaked and had to return it to Amazon for a replacement. Definitely on the homestead priority list as we have very hard water. All in all we have been pretty happy with the heater. Super easy install except for cutting a hole in the logs for the vent.
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Reviewed in the United States on May 23, 2024 by Jeffz Jeffz
Material Type: 3.6 GPM, 80,000 BTU, indoor
Style: Propane Gas
I paid more for this product than many of its competitors with the thought that you get what you pay for. I installed it in late spring of 2024 and it worked great through the winter. This is heating a tiny house and serves one shower, and one sink, neither are used at the same time. Winter hit and it started shutting down on me and after some research, I discovered that the propane tank needed to be kept warmer. Keep in mind I live in the desert of New Mexico. Once I built a heated compartment around the propane tank, I was sure that would fix the problem. WRONG! Now it gives a different error code and will produce 60-90 seconds of hot water before turning cold. Then you turn the water off and immediately back on, wait for it to heat up again and get another 60-90 seconds of hot water. After going through this mess of a cycle 3 to 4 times, you can actually get several minutes of hot water, up to about 5 and a half minutes before it gets cold again. According to the error code it could be one of 3 different problems, none of which make any sense. I bought this because I needed a DIY unit with no plumber fees. What I got was a mess. Shower time should be relaxing but my showers are now the worst part of my day…. Don’t buy this unless you don’t mind a product that is not dependable and doesn’t work as they said it would…. UPDATE 2-11-2025 After posting the above review, the company reached out with a misleading email which stated that they were offering me a full refund for my trouble. I wasn’t looking for that, I just wanted to post my experience with this product. When I responded to their message, they offered me customer support instead of a refund which I was very happy about. I need a working water heater, not my money back. I utilized the help from customer support and though the problem got better, It was still persistent. So I let them know this, hoping for more fix options. Instead they ask for my elevation which I gave to them. Now they have come back with a screen shot of their Q&A stating that the unit is not recommended for use above 2000 ft above sea level. I’m in the desert at 3600. Their offer now is to send me a shipping label and return the unit. I get that chemical reactions like cakes rising and things like that are affected by altitude but I worked 8 years a s a plumber and never once did we instal a water heater that had an elevation requirement on it. This is nonsense and completely unacceptable. I don’t know anyone who would ask about an elevation requirement on a water heater and more than that don’t understand why they would make a unit that can’t work at all elevations… don’t waste your time or money, there are far better products out there.
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Reviewed in the United States on February 3, 2025 by Daniel
Material Type: 3.6 GPM, 80,000 BTU, indoor
Style: Propane Gas
Downgraded from a 5 start to 4 over the freezing issues we’re having with it, simply will not stay thawed. Still works great and doesn’t leak but it will not stay thawed in a heated basement with a baffled exhaust pipe. The unit is advertised as having freeze protection but it doesn’t work. The only issue in 10 months of use. 3” vent 120v plug 3/4” npt plumbing Super easy plug and play. A little rough on the consistency of water temp, seems well built, super hot shower, struggling with a high efficiency kitchen sink not being enough flow. Way better than the electric one we replaced.
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Reviewed in the United States on April 7, 2025 by Ben
Material Type: 3.6 GPM, 80,000 BTU, indoor
Style: Propane Gas
Good product works for the space I have. Not super load either which is nice. Sound like a noise machine for sleeping. Only thing is it isn't for large spaces so keep that in mind. It also come with a hose to drain it. Which is convenient for places with high humidity
Reviewed in the United States on January 5, 2026 by Kass Kass
Material Type: 4.0 GPM, 90,000 BTU, indoor
Style: Propane Gas
Buy this! Only on when you use water. Turn off the water and heater is immediately off. Bought a 5 gallon tank of propane 2 months ago and it's still 2/3 full. I live alone in a tiny house and it's been great. First had a 7 gallon electric water heater. Fine for dishes and a goid shower, but I'd much rather have a bath. Finally talked myself into buying this and I've not regretted it for a minute. My son installed it for me. Not too complicated. It does plug on for the control panel so need to be near a regular outlet.
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Reviewed in the United States on September 25, 2025 by mcarlo