APUS AP-AWH-Q16NG 120,000 BTU Natural Gas Tankless Water Heater

What it delivers

The APUS AP-AWH-Q16NG 120,000 BTU Natural Gas Tankless Water Heater is a non-condensing gas tankless with a 120,000 BTU/h burner and a stated maximum flow of 5.4 GPM. Its listing gives a UEF of 0.81.

Worked out from its input, it delivers roughly 4.1 GPM when the water only has to rise 45°F, and 2.6 GPM at a 70°F winter rise: 2 showers at 2 GPM in summer, 1 shower at 2 GPM in winter. Check it against your own fixtures.

The line must deliver about 116 cubic feet of natural gas an hour when it fires flat out. The requirement calculator adds it up; a licensed fitter confirms the pipe.

Its exhaust runs hot, so the vent must be the material its manual lists, usually stainless; budget for the vent kit.

Other listed details: material: 120,000BTU,5.43 GPM; model: AP-AWH-Q16NG; warranty: 2 Year Manufacturer Warranty.

The listing gives dimensions of 19.29 in (W) x 27.59 in (H) and a weight of 19.2 lb.

Warranty, per the listing: 2 Year Manufacturer Warranty.

Right unit for this house?

Install it when

One shower at a time in cold climates
Replacing a gas tank heater

Look at another unit when

More than 1 winter shower at once
Homes without a gas line

Strengths and trade-offs

Strengths

120,000 BTU/h input
Up to 5.4 GPM
UEF 0.81

Trade-offs

Needs a gas line sized for the load
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	AP-AWH-Q16NG	Retailer
Dimensions (seller)	19.29"W x 27.59"H	Retailer
Features (seller)	24/7 Customer Service, Anti-Freezing Protection, Easy Installation, Energy Saving, Low Water Flow Protection 24/7 Customer Service, Anti-Freezing Protection, Easy Installation, Energy Saving, Low Water Flow Protection	Retailer
Voltage	120 V	Retailer
Max flow (maker)	5.43 GPM	Retailer
Input (maker)	120,000 BTU/h	Retailer
Product weight	19.2 lb	Retailer
Warranty	2 Year Manufacturer Warranty	Retailer
Material	120,000BTU,5.43 GPM	Retailer
UEF (maker)	0.81	Retailer
Fuel	Natural Gas	Retailer

Rival units at this flow

Westinghouse AMZ-HW120A1G-NG 120,000 BTU Natural Gas Tankless Water Heater120,000 BTU/h, up to 5.1 GPM.

ThermoMate CZ422NG Natural Gas Tankless Water Heater113,000 BTU/h, up to 5.0 GPM.

Camplux CA422-NG 102,000 BTU Natural Gas Tankless Water Heater102,000 BTU/h, up to 4.2 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 sensible non-condensing gas tankless for one shower at a time in cold climates.

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Questions buyers ask

How many showers can the APUS AP-AWH-Q16NG 120,000 BTU Natural Gas Tankless Water Heater run at once?

From its 120,000 BTU/h input we estimate about 4.1 GPM at a 45°F rise and 2.6 GPM at a 70°F rise, so 2 two-GPM showers with mild inlet water and 1 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-Q16NG 120,000 BTU Natural Gas Tankless Water Heater need?

At full fire it uses about 116 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.