How many fixtures can the RE140iN run at once?

At 5.3 GPM it handles one shower comfortably, or a shower plus a low-flow sink. Two showers at once will likely outrun it.

Can it be installed outdoors?

No. It is an indoor unit and needs proper indoor venting and a natural gas supply.

Does it work with hard water?

It works, but scale builds up in the heat exchanger. Plan on annual descaling, or add a scale-control valve.

Is it a good fit for a large family?

Only if hot-water use is staggered. A larger-capacity Rinnai model suits homes running several showers at once.

What maintenance does it need?

Flush the heat exchanger yearly, clean the inlet filter, and keep the vent clear. That keeps efficiency and flow steady.

Where is the Rinnai RE140iN cheapest?

At Amazon, for $795.69, as of our latest check.

Rinnai RE140iN

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$795.69at AmazonChecked Nov 8

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Price facts

Last seen at $795.69 at Amazon on Nov 8.

Our take on the Rinnai RE140iN

The Rinnai RE140iN is an indoor, natural-gas tankless water heater rated at 5.3 GPM, enough for one shower plus a sink or appliance at once. It heats water on demand, so there is no tank to run out or keep warm, and it fits in a closet or utility space. Compared with larger Rinnai models it trades simultaneous hot-water capacity for a smaller footprint and simpler venting, and owners like the endless supply for one-bathroom use. It suits small homes and apartments more than large households running several showers at once.