Noritz NR66-OD
The Noritz NR66-OD is a compact outdoor non-condensing gas tankless: 140,000 BTU/h, up to 6.6 GPM, and about 0.83 EF, in a weatherproof cabinet built for exterior mounting. Because it installs outdoors, it needs no indoor venting or condensate drain — a real simplification for warm-climate homes, cabins, and small houses where freezing is rare. It uses direct electronic ignition (no standing pilot), operates from 115–140 °F, and includes a full safety package: flame sensor, overheat prevention, and even lightning protection. Noritz backs it with a strong 12-year heat-exchanger warranty.
As a non-condensing outdoor unit it's simpler and cheaper to install than a condensing indoor heater, but it's less efficient and, like all tankless, its flow tracks inlet temperature: about 6.6 GPM at a warm rise, dropping toward 3.3 GPM in colder water. It's best where winters are mild — outdoor units risk freezing in hard cold without protection. With a ~4.2-star rating, owners value the easy outdoor install, reliability, and Noritz build quality. For a small warm-climate home or cabin, it's a clean, low-hassle way to endless hot water.
Key Features
Best Use Cases
Our Verdict
A well-built outdoor non-condensing tankless that skips indoor venting entirely — ideal for a small warm-climate home or cabin. Simple install, reliable Noritz engineering, and a 12-year heat-exchanger warranty. Just keep it to mild-winter regions and size expectations to its 6.6 GPM.
What owners report
Themes summarized from verified-purchase reviews across major retailers (4.2★ average, 35 ratings). These are aggregated owner opinions — not our own bench testing.
Owners value that outdoor mounting eliminates indoor venting and condensate work, simplifying the whole job.
Reviewers credit dependable operation and quality engineering, with lightning and overheat protection built in.
At 6.6 GPM it suits small homes and cabins; owners note it isn't meant for heavy simultaneous demand.
As an outdoor unit it's best in mild-winter regions; hard freezes require added freeze protection.
Noritz NR66-OD FAQ
Does the NR66-OD need venting?+
No — it mounts outdoors, so it needs no indoor venting or condensate drain. That's its main install advantage in warm climates.
Can I use it in a cold climate?+
It's best in mild-winter regions. As an outdoor unit it can be at risk of freezing in hard cold without additional freeze protection.
How many fixtures can it run?+
Up to about 6.6 GPM in warm climates — a couple of fixtures — dropping toward 3.3 GPM as inlet water gets colder.
Does it have a standing pilot?+
No — it uses direct electronic ignition, so there's no constantly-burning pilot flame to waste gas.
Price range from leading retailers
* As an Amazon Associate, we earn from qualifying purchases
