Ranein RH19K-NG 190,000 BTU Natural Gas Tankless Water Heater

What it delivers

The Ranein RH19K-NG 190,000 BTU Natural Gas Tankless Water Heater is a non-condensing gas tankless with a 190,000 BTU/h burner and a stated maximum flow of 8.5 GPM.

Flow depends on how cold the incoming water is. Our estimate from its input: 6.5 GPM at a 45°F rise, falling to 4.2 GPM at 70°F, which is 2 showers at 2 GPM on a cold-climate winter day. 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.

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

Also on the listing: features: LED Display; connections: 3/4" npt; material: Natural Gas; model: RH19K-NG; warranty: 2 Year Manufacturer.

The listing gives dimensions of 15.08 in (W) x 24.25 in (H) and a weight of 42 lb.

Warranty, per the listing: 2 Year Manufacturer.

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 8.5 GPM

Trade-offs

Gas line may need upsizing
Stainless venting costs more
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	RH19K-NG	Retailer
Dimensions (seller)	15.08"W x 24.25"H	Retailer
Features (seller)	LED Display	Retailer
Voltage	120 V AC	Retailer
Max flow (maker)	8.5 GPM	Retailer
Input (maker)	190,000 BTU/h	Retailer
Product weight	42 lb	Retailer
Material	Natural Gas	Retailer
Warranty	2 Year Manufacturer	Retailer
Fuel	Natural Gas	Retailer
Connections	3/4" npt	Retailer

Rival units at this flow

VancEpic V-RH19K-NG 190,000 BTU Natural Gas Tankless Water Heater190,000 BTU/h, up to 8.5 GPM.

A. O. Smith ATI-540P-N 199,000 BTU Natural Gas Tankless Water Heater199,000 BTU/h, up to 10.0 GPM.

GASLAND CE686NG 199,000 BTU Natural Gas Tankless Water Heater199,000 BTU/h, up to 7.6 GPM.

More gas tankless water heaters rated for similar demand

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

Final verdict

A practical non-condensing gas tankless for houses running 2 showers at once in winter.

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Questions buyers ask

What flow does the Ranein RH19K-NG 190,000 BTU Natural Gas 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 Ranein RH19K-NG 190,000 BTU Natural Gas 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.