APUS AP-AWH-W26NG 190,000 BTU Natural Gas Outdoor Tankless Water Heate

What it delivers

The APUS AP-AWH-W26NG 190,000 BTU Natural Gas Outdoor Tankless Water Heater is an outdoor gas tankless with a 190,000 BTU/h burner and a stated maximum flow of 8.1 GPM. Its listing gives a UEF of 0.81.

Expect about 4.2 GPM with cold winter water (a 70°F rise) and 6.5 GPM when the inlet is milder (45°F rise); that is 2 showers at 2 GPM in January. Run your house through the planner.

The line must deliver about 183 cubic feet of natural gas an hour when it fires flat out. The requirement calculator adds it up; a licensed fitter confirms the pipe.

As an outdoor model it mounts on an exterior wall and needs no vent pipe; in freezing climates check the maker's freeze protection and cover the connections.

Listed details: material: Natural Gas,8.1GPM,190,000BTU; model: AP-AWH-W26NG; warranty: 2 Year Manufacturer Warranty.

The listing gives dimensions of 6.54 in (W) x 22.48 in (H) and a weight of 42.5 lb.

Warranty, per the listing: 2 Year Manufacturer Warranty.

Right unit for this house?

Install it when

Houses running 2 showers at once in winter
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

190,000 BTU/h input
Up to 8.1 GPM
UEF 0.81
No vent pipe

Trade-offs

Needs a gas line sized for the load
Needs freeze protection outdoors
Annual flushing on hard water

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	AP-AWH-W26NG	Retailer
Dimensions (seller)	6.54"W x 22.48"H	Retailer
Voltage	120 V AC	Retailer
Max flow (maker)	8.1 GPM	Retailer
Input (maker)	190,000 BTU/h	Retailer
Product weight	42.5 lb	Retailer
Warranty	2 Year Manufacturer Warranty	Retailer
Material	Natural Gas,8.1GPM,190,000BTU	Retailer
UEF (maker)	0.81	Retailer
Fuel	natural gas	Retailer

Rival units at this flow

APUS AP-AWH-W26LPG 190,000 BTU Propane Outdoor Tankless Water Heater190,000 BTU/h, up to 8.1 GPM.

Ranein RHO19K-LPG 190,000 BTU Propane Outdoor Tankless Water Heater190,000 BTU/h, up to 8.5 GPM.

Ranein RHO19K-NG 190,000 BTU Natural Gas Outdoor Tankless Water Heater190,000 BTU/h, up to 8.5 GPM.

More gas tankless water heaters rated for similar demand

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

Final verdict

A well-specified outdoor gas tankless for houses running 2 showers at once in winter.

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Questions buyers ask

What flow does the APUS AP-AWH-W26NG 190,000 BTU Natural Gas Outdoor Tankless Water Heater give in winter?

From its 190,000 BTU/h input we estimate about 6.5 GPM at a 45°F rise and 4.2 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 APUS AP-AWH-W26NG 190,000 BTU Natural Gas Outdoor Tankless Water Heater need?

At full fire it uses about 183 cubic feet of natural gas an hour. 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.