How many fixtures can the RX180 run at once?

Rinnai rates it for about 3 to 5 fixtures. Its 10.0 GPM maximum flow covers simultaneous showers and appliances in most homes.

Can the RX180 be installed outdoors?

Yes. It is rated for indoor or outdoor installation. Outdoor mounting skips indoor venting but still needs proper clearances and gas supply.

Does it work with recirculation?

Yes, it is recirculation capable. You need the matching Rinnai recirculation accessories and a compatible setup to get instant hot water at the tap.

What warranty does Rinnai give?

Limited 15 years on the heat exchanger, 5 years on parts and 1 year on labor.

Does it need electricity?

Yes. Tankless units use power for controls, ignition and the fan, so it needs a standard electrical connection in addition to the gas line.

It is Wi-Fi capable, but you need Rinnai's control accessory to connect it to the app.

Where is the Rinnai Tankless Water Heater - RX180 cheapest?

At Natural Gas Connection, for $1,765.56, as of our latest check.

Rinnai Tankless Water Heater - RX180

Best price now

$1,765.56at Natural Gas ConnectionChecked Nov 8

Prices are checked against each store and labelled with when.

Visit Natural Gas Connection

Rinnai Tankless Water Heater - RX180

Best price now

$1,765.56at Natural Gas ConnectionChecked Nov 8

Prices are checked against each store and labelled with when.

Visit Natural Gas Connection

Ask our agent about this product

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Price facts

Last seen at $1,765.56 at Natural Gas Connection on Nov 8.

Our take on the Rinnai Tankless Water Heater - RX180

The Rinnai RX180 is a natural gas condensing tankless water heater rated at 180,000 BTU and up to 10.0 GPM, enough for roughly 3 to 5 fixtures at once. Its 0.98 Uniform Energy Factor puts it among the most efficient gas tankless units sold. It can be installed indoors or outdoors, supports Wi-Fi monitoring and recirculation, and carries a 15-year heat exchanger warranty. It suits larger households replacing a tank or stepping up from a smaller tankless unit; smaller homes may find its capacity and price class more than they need.

Best forLarge households with 3 to 5 fixtures in use at onceHomes with natural gas and a condensing venting setupBuyers who want recirculation-ready hot waterIndoor or outdoor installations

Pros

High 0.98 Uniform Energy Factor for a gas tankless unit
10.0 GPM and 180,000 BTU handle several fixtures at once
Indoor or outdoor installation flexibility
Wi-Fi capable and recirculation capable
15-year heat exchanger warranty

Cons

Requires natural gas and proper venting for indoor use
Condensing units produce acidic condensate that needs a drain or neutralizer
55 lb unit needs solid mounting and a qualified installer
Recirculation and Wi-Fi need extra accessories to work

Rinnai Tankless Water Heater - RX180 prices at every store

Natural Gas ConnectionNew
Availability unknownReturn policy
$1,765.56Checked Nov 8
Visit Natural Gas Connection

What reviewers say

Complaints tend to center on installer-dependent setup and the cost of accessories.

What people mention

Hot water supplyPraisedOwners say it keeps up with several showers and appliances running at once.
EfficiencyPraisedUsers report lower gas bills after switching from a storage tank.
InstallationCriticisedBuyers say professional installation and venting add significant cost and effort.
CondensateMixedThe condensing design needs a drain or neutralizer, which some owners find inconvenient.
NoisePraisedOwners describe operation as quiet compared with older units.

From Natural Gas Connection

Internal 180,000 BTU, 10.0 GPM max with valve
Suitable for 3–5 fixtures
Indoor and outdoor installation available
Size of a small suitcase
Uniform Energy Factor 0.98
Continuous supply of hot water without interruption

Guarantee: Limited 15-year warranty on heat exchanger, 5-year on parts, 1-year on labor

About the Rinnai Tankless Water Heater - RX180

The Rinnai RX180 is a natural gas condensing tankless water heater. It heats water on demand, so hot water keeps flowing without interruption for showers, dishwashing and laundry.

It has a maximum input of 180,000 BTU and a maximum flow rate of 10.0 GPM. It is suitable for 3 to 5 fixtures and has a Uniform Energy Factor of 0.98. The unit is about the size of a small suitcase and can be installed indoors or outdoors.

The RX180 is Wi-Fi capable and recirculation capable.

Fuel type: Natural gas
Type: Condensing tankless, internal with valve
Max input: 180,000 BTU
Min input: 15,000 BTU
Max flow rate: 10.0 GPM (38 L/min)
Efficiency: Uniform Energy Factor 0.98
Fixtures: Suitable for 3 to 5 fixtures
Installation: Indoor or outdoor
Wi-Fi: Yes
Recirculation: Capable
Width: 18.5 in (470 mm)
Height: 30.11 in (762 mm)
Depth: 11.4 in (291 mm)
Weight: 55 lb (24.5 kg)
Warranty: Limited 15-year on heat exchanger, 5-year on parts, 1-year on labor

Specifications

Uniform Energy Factor: 0.98Source
Minimum BTU: 15,000 BTUSource
Maximum BTU: 180000 BTUSource
Product Width: 18.5 inch / (470 mm)Source
Product Height

Questions and answers

How many fixtures can the RX180 run at once?: Rinnai rates it for about 3 to 5 fixtures. Its 10.0 GPM maximum flow covers simultaneous showers and appliances in most homes.
Can the RX180 be installed outdoors?: Yes. It is rated for indoor or outdoor installation. Outdoor mounting skips indoor venting but still needs proper clearances and gas supply.
Does it work with recirculation?: Yes, it is recirculation capable. You need the matching Rinnai recirculation accessories and a compatible setup to get instant hot water at the tap.
What warranty does Rinnai give?: Limited 15 years on the heat exchanger, 5 years on parts and 1 year on labor.
Does it need electricity?: Yes. Tankless units use power for controls, ignition and the fan, so it needs a standard electrical connection in addition to the gas line.
Is Wi-Fi built in?: It is Wi-Fi capable, but you need Rinnai's control accessory to connect it to the app.
Where is the Rinnai Tankless Water Heater - RX180 cheapest?: At Natural Gas Connection, for $1,765.56, as of our latest check.