Midea MGWH180IXNN is a gas tankless water heater from Midea rated 5.2 GPM at a 0.95 UEF — 175 therms/yr certified use, 180k BTU/h input.
Our take
The MGWH-series natural-gas unit shares its certified numbers with Midea's JSG platform: 180 kBTU input, 0.95 UEF, about $254 a year at average gas rates, and 5.2 GPM rated flow that holds near 4.9 GPM through a 70 °F winter rise — two showers with margin. Activation at 0.6 GPM catches modest draws. The cabinet is the same tidy 17.3 × 11 inch format, power-direct vented over 2- or 3-inch pipe. If you are comparing the two Midea lines, the certified spec gives you no reason to prefer one over the other.
Best for: Two-bath natural-gas households wanting a small wall footprint.
Trade-off: Mid-pack efficiency; the class's 0.98-UEF units save a few dollars a year.
Efficiency
Uniform Energy Factor (UEF)
0.95
Annual gas use (natural gas)
175 therms/yr
Annual propane use
191.25 gal/yr
General
Fuel
Natural Gas
Capacity
Max flow rate
5.2 GPM
Draw pattern
High
Minimum activation flow
0.6 GPM
Performance
Gas input rate
180 kBTU/h
Installation
Max current draw
1.3 A
Vent type
Power Direct Vent
Vent size
2 / 3
Smart features
Smart / connected capable
No
Dimensions
Height
26.8 in
Width
17.3 in
Depth
11 in
Certification
ENERGY STAR certified
Yes
Real flow rate by climate
A tankless heater's usable flow depends on how far it must raise incoming water
temperature. Sustained hot-water flow of the Midea MGWH180IXNN at common temperature
rises (a typical shower uses about 2 GPM of mixed water):
Temperature rise
Climate
Sustained flow
Simultaneous showers
45 °F
Warm climate (~75 °F groundwater)
5.2 GPM
2
55 °F
Mild climate (~65 °F groundwater)
5.2 GPM
2
70 °F
Cold climate (~50 °F groundwater)
4.9 GPM
2
77 °F
DOE test condition
4.4 GPM
2
Also sold as
The Midea MGWH180IXNN is certified hardware that Midea and its partner brands
publish under 2 names. The same specifications apply to every
variant:
Yes, the Midea MGWH180IXNN holds a current ENERGY STAR certification for water heating efficiency (UEF 0.95).
How much does the Midea MGWH180IXNN cost to run per year?
About $254 per year at national average energy rates, based on its certified annual energy use under the DOE test draw pattern. Your rate and usage change this figure.
What venting does the Midea MGWH180IXNN use?
The Midea MGWH180IXNN uses Power Direct Vent venting with 2 / 3 in vent connections. Matching the existing vent type is usually the cheapest replacement path.
Is the Midea MGWH180IXNN a smart water heater?
No, the Midea MGWH180IXNN is not connected-capable — it has no app connectivity or demand-response support.
