MIZUDO WCIU-HW199A1G-LP-M1n 199,000 BTU Propane Tankless Water Heater

What it delivers

The MIZUDO WCIU-HW199A1G-LP-M1n 199,000 BTU Propane Tankless Water Heater is a propane tankless with a 199,000 BTU/h burner and a stated maximum flow of 10.3 GPM.

Flow depends on how cold the incoming water is. Our estimate from its input: 6.8 GPM at a 45°F rise, falling to 4.4 GPM at 70°F, which is 2 showers at 2 GPM on a cold-climate winter day. Run your house through the planner.

At full fire it burns about 2.2 gallons of propane an hour. The gas line has to carry that on top of the furnace, range and dryer; a gas fitter sizes the pipe from its length and the total load.

Non-condensing indoor units run hot exhaust and vent in the maker's listed vent system (often stainless Category III), which costs more than plastic.

The listing describes its venting as: direct-vent.

Also on the listing: connections: 3/4" npt; connectivity: WiFi; vent size: 5" concentric; material: Propane Gas, 10.3 GPM, 199,000 BTU, Indoor; model: WCIU-HW199A1G-LP-M1n.

The listing gives dimensions of 15.9 in (W) x 24.8 in (H) and a weight of 55.5 lb.

Right unit for this house?

Install it when

Houses running 2 showers at once in winter
Propane homes
Replacing a gas tank heater

Look at another unit when

More than 2 winter showers at once
Homes without a gas line

Strengths and trade-offs

Strengths

199,000 BTU/h input
Up to 10.3 GPM

Trade-offs

Gas pipe sizing to confirm
Stainless venting costs more
Scale builds up without flushing

Install limits

Figures are the maker's or seller's own. Flow at a rise is our estimate from the input; gas, venting and electrical work needs a licensed professional.

Rated performance

Every figure below comes from the source shown in brackets. Where the maker doesn't state something, we say so instead of estimating.

Model number	WCIU-HW199A1G-LP-M1n	Retailer
Dimensions (seller)	15.9"W x 24.8"H	Retailer
Voltage	120 V	Retailer
Max flow (maker)	10.3 GPM	Retailer
Input (maker)	199,000 btu_per_hour_per_foot_per_fahrenheit	Retailer
Product weight	55.5 lb	Retailer
Material	Propane Gas, 10.3 GPM, 199,000 BTU, Indoor	Retailer
Fuel	propane	Retailer
Venting	direct-vent	Retailer
Connections	3/4" npt	Retailer
Vent size	5" concentric	Retailer
Connectivity	WiFi	Retailer

Rival units at this flow

GASLAND CE686LP 199,000 BTU Propane Tankless Water Heater199,000 BTU/h, up to 7.6 GPM.

Rheem RTG-95DVELP-3 199,900 BTU Propane Tankless Water Heater199,900 BTU/h, up to 9.5 GPM.

Rheem RTGH-95DVLP-3 199,900 BTU Propane Tankless Water Heater199,900 BTU/h, up to 9.5 GPM.

More gas tankless water heaters rated for similar demand

Full gas tankless water heaters spec grid · Every MIZUDO unit in the catalog

Final verdict

A practical propane tankless for houses running 2 showers at once in winter.

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Questions buyers ask

What flow does the MIZUDO WCIU-HW199A1G-LP-M1n 199,000 BTU Propane Tankless Water Heater give in winter?

From its 199,000 BTU/h input we estimate about 6.8 GPM at a 45°F rise and 4.4 GPM at a 70°F rise, so 3 two-GPM showers with mild inlet water and 2 in a cold winter. The maker's flow chart for this model is the final word.

What size gas line does the MIZUDO WCIU-HW199A1G-LP-M1n 199,000 BTU Propane Tankless Water Heater need?

At full fire it uses about 192 cubic feet of natural gas an hour or 2.2 gallons of propane. The pipe size depends on the length of the run and every other gas appliance on it; the maker's manual and a licensed gas fitter decide it.