Mizudo 4.3
The Mizudo 4.3 is a budget indoor natural-gas tankless: 100,000 BTU/h, up to 4.3 GPM, a UEF just over 0.81, and an oxygen-free copper heat tank for efficient transfer and corrosion resistance. It runs on 120V for its controls, uses a 3-inch power vent, and offers a touch panel with LED display, a 95–149 °F range, and ±1 °F temperature control, plus overheat and flame-failure protection with CSA certification. Mizudo rates it for two to three fixtures — up to two showers at once depending on inlet temperature.
As a non-condensing unit it's inexpensive and needs no condensate drain, but uses more gas per gallon than a condensing model and must be properly vented. At 100,000 BTU it holds its 4.3 GPM in warm climates and drops toward two GPM in the cold. With a modest but positive review base (~4.3 stars), owners like the value, LED touch controls, and steady temperature. For a small home or apartment wanting simple, affordable gas hot water, it delivers the essentials without frills.
Key Features
Best Use Cases
Our Verdict
A no-frills budget indoor gas tankless for a small home or apartment — LED touch control and an oxygen-free copper exchanger are nice touches at the price. Non-condensing and modest in capacity, best for warm/mild climates that can vent it properly. Value-first buyers get the essentials done.
What owners report
Themes summarized from verified-purchase reviews across major retailers (4.3★ average, 58 ratings). These are aggregated owner opinions — not our own bench testing.
Owners cite genuine gas hot water at a budget price, with the LED touch panel a welcome extra in this class.
The ±1 °F control and oxygen-free copper exchanger draw praise for consistent output in normal use.
As a combustion appliance it needs correct 3-inch power venting and gas sizing; a competent install matters.
With a smaller review base, long-term durability and support are less proven than mainstream names.
Mizudo 4.3 FAQ
How many fixtures can the Mizudo 4.3 run?+
Up to about 4.3 GPM — two to three fixtures, or up to two showers, in warm climates, tapering as inlet water gets colder.
Does it need electricity?+
Yes — it uses a 120V connection for its controls and power venting, so it isn't a power-free unit.
Is it condensing?+
No — it's non-condensing at roughly 0.81 UEF. No condensate drain, but it needs 3-inch power venting and uses more gas per gallon than a condensing unit.
What temperature range does it offer?+
95–149 °F with ±1 °F precision via the touch panel, giving fine control for showers and household tasks.
Sources
Price range from leading retailers
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