Mizudo HW199
0.81 UEF DOE CCD · 2026-09-19Grade G: where this UEF sits among the 397 models in its class, lowest (G) to highest (A). A position, not an official label. How the grade is set
A gas tankless unit, high draw pattern (a larger household, or one where showers and laundry overlap).
If you are checking the Mizudo HW199, this gas tankless unit uses 209 therms of natural gas a year at the federal test's daily hot-water draw. That figure is for the high draw pattern, the standard daily hot-water usage DOE tests against. It is 27 therms above the 182 therms median for its class.
Energy use per year
209 therms a year
Computed by this site from the registry's UEF and the federal test's daily hot-water draw for this draw pattern. What it costs depends on the natural gas rate where you live.
That is above the median of 182 therms for the 397 models registered in the same heater type and draw pattern; it ranks 323 of 397, lowest energy first.
Solid line: this model (209 therms). Dashed line: the class median.
Min 173 therms Median 182 therms Max 209 therms
What it costs to run where you live
What the registry files
- UEF (Uniform Energy Factor) how much hot water you get for each unit of energy the heater uses
- 0.81 DOE CCD · 2026-09-19 Compared only with other models registered as a gas tankless unit at the high draw pattern.
- Draw Pattern the standard daily usage profile DOE tests the unit against
- High DOE CCD · 2026-09-19
- Maximum Gallons Per Minute how many gallons a minute it can heat while running continuously
- 5 gal/min DOE CCD · 2026-09-19
What it costs to install
$1,698–$2,632 installed
Not a quote — a modeled range of what installers have charged for this class of unit; your price will vary with labor rates, access, and local code requirements.
Escalation indexes: equipment (BLS PPI) latest available: August 2026; labor (BLS ECI) latest available: April 2026 to June 2026.
NLR REMDB (BLS PPI/ECI escalated) · 2026-04-01Safety record
No CPSC recall names this model.
Checked against the CPSC recall database. CPSC does not publish a model-level match for this product category, so this list is curated by hand from the manufacturer's recall filings.
CPSC · 2026-09-24What these figures mean
How this compares
The closest models in the same class — same fuel, type and draw pattern.
Keep going
How every figure on this page is calculated
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Find what replaces your water heater
Enter the model number off your old unit and see what is on file today, with the yearly cost difference.
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Find a water heater that fits
Three questions — fuel, hot water need, install space — narrow every model on file to the ones that fit.
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What a water heater costs to run
Prices a unit's efficiency against your own utility's filed tariff for your ZIP code.
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How to size a tankless water heater by GPM
Answered from what models in this size actually file.
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Water heaters
Every model on file with the Department of Energy, by heater type.
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All gas tankless water heaters
Gas-fired instantaneous units, sized by flow rate rather than tank gallons.
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Every Mizudo model on file
What this brand files, by heater type.
UEF 0.81 · Grade G Price it on your ZIP
The 209 therms figure comes from this site's calculation. The registry does not state it. It combines the registry's UEF, the ratio of hot water delivered to energy used, with the DOE test's daily hot-water draw for the high draw pattern. For the Mizudo HW199, the registry lists a UEF of 0.81. We retrieved it from the DOE CCD on 2026-09-19. The class is the 397 models registered as a gas tankless unit at the high draw pattern. In that class, this unit ranks 323rd lowest in energy use of 397, which puts it in the highest quarter of its class for energy use. All models in this comparison use the same test draw. So the 27 therms gap from the median follows from the rated UEF, not from a different usage assumption. The inputs are set out in how the annual cost is calculated.
The high draw pattern describes a larger household, or one where showers and laundry overlap. For this model, the registry lists a maximum flow rate in gallons per minute of 5. A household that matches that pattern can use the 209 therms figure as a reference for this unit at the test draw. For a household that uses less or more hot water than the test assumes, the figure will not match its own use. The registry has no figure for that household's actual use. A reader who wants a model below the 182 therms median in the same class can compare it with this unit's 323rd position. To do that, find a same-class replacement by model number.
This text does not state a running cost. The cost depends on your state's average residential gas price, so the page calculates it from your ZIP. At any rate, the yearly cost difference from a median model follows from the 27 therms gap in gas use at the high draw pattern. To see that cost on your own rate, use the cost calculator on your own ZIP. The installed price range appears in its own block, with its source and date. It is a modeled installed-cost range, not a quote. Both the energy and cost figures assume the federal test's daily draw. Energy use in a particular home is unknown and is not available from the registry.
DOE CCD · 2026-09-19