Rinnai RE140iP Propane Tankless Water Heater: 140,000 BTU/h

What it delivers

The Rinnai RE140iP Propane Tankless Water Heater is a propane tankless with a 140,000 BTU/h burner and a stated maximum flow of 5.3 GPM.

Flow depends on how cold the incoming water is. Our estimate from its input: 4.8 GPM at a 45°F rise, falling to 3.1 GPM at 70°F, which is 1 shower at 2 GPM on a cold-climate winter day. Run your house through the planner.

Gas load at full fire: about 1.5 gallons of propane an hour. An older half-inch line that already feeds a furnace often can't spare that, so have a gas fitter check the pipe size and run.

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; connectivity: WiFi; model: RE140iP; warranty: 1 Year Labor, 5 Year Parts.

The listing gives dimensions of 14.05 in (W) x 27.28 in (H) and a weight of 48.5 lb.

Warranty, per the listing: 1 Year Labor, 5 Year Parts.

Right unit for this house?

Install it when

One shower at a time in cold climates
Propane homes
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

140,000 BTU/h input
Up to 5.3 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	RE140iP	Retailer
Dimensions (seller)	14.05"W x 27.28"H	Retailer
Features (seller)	LED Display	Retailer
Voltage	120 V	Retailer
Max flow (maker)	5.3 GPM	Retailer
Input (maker)	140,000 BTU/h	Retailer
Product weight	48.5 lb	Retailer
Warranty	1 Year Labor, 5 Year Parts	Retailer
Fuel	Propane	Retailer
Condensing	non-condensing	Retailer
Connectivity	WiFi	Retailer

Rival units at this flow

APUS AP-AWH-Q20LPG 140,000 BTU Propane Tankless Water Heater140,000 BTU/h, up to 6.8 GPM.

Camplux CA528M-LP 150,000 BTU Propane Tankless Water Heater150,000 BTU/h, up to 6.4 GPM.

GEARPASS JSQ24 130,000 BTU Propane Tankless Water Heater130,000 BTU/h, up to 5.3 GPM.

More gas tankless water heaters rated for similar demand

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

Final verdict

A practical propane tankless for one shower at a time in cold climates.

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Questions buyers ask

Is the Rinnai RE140iP Propane Tankless Water Heater big enough for two showers?

From its 140,000 BTU/h input we estimate about 4.8 GPM at a 45°F rise and 3.1 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 Rinnai RE140iP Propane Tankless Water Heater need?

At full fire it uses about 135 cubic feet of natural gas an hour or 1.5 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.