Rheem RTGH-84DVLN
The Rheem RTGH-84DVLN-3 is the workhorse of Rheem's super-high-efficiency condensing line — 157,000 BTU/h and 8.4 GPM on natural gas at up to 0.93 UEF, ENERGY STAR certified. It uses a condensing (dual heat exchanger) design to recover exhaust heat that a non-condensing unit would waste, which both raises efficiency and allows lighter, cheaper PVC/CPVC venting (runs up to roughly 60 ft in 2-inch or 150 ft in 3-inch).
It modulates from about 11,000 up to 157,000 BTU/h, activates at 0.40 GPM, and includes two Rheem signatures: Hot Start Programming to eliminate cold-water bursts between back-to-back draws, and an Overheat Film Wrap that protects the heat exchanger. It's EcoNet-capable for app control and, on Wi-Fi models, LeakGuard leak detection. In short, it's the efficient, high-flow gas unit for a 2–3 bathroom home — the IKONIC's performance without the IKONIC's smart-first price.
Key Features
Best Use Cases
Our Verdict
The RTGH-84DVLN-3 is the value-smart choice in Rheem's condensing range: you get the same 8.4 GPM and condensing efficiency as the flagship IKONIC, minus the built-in Wi-Fi and LeakGuard, for meaningfully less money. For most 2–3 bath homes that just want efficient, high-volume hot water, that's the right trade. Owner sentiment is positive on efficiency, quiet operation, and Hot Start's smooth temperatures; the honest cautions are condensing-specific — it needs a condensate drain, and beyond the usual Code 11 ignition fault it can throw condensate-related codes (like 92 or 29) that non-condensing units don't. Our take: the best all-round condensing pick in Rheem's lineup for efficiency-minded homeowners who don't need smart features — buy this, and only step up to IKONIC if leak protection or app control genuinely matters to you.
What owners report
Themes summarized from verified-purchase reviews across major retailers (4.3★ average, 50 ratings). These are aggregated owner opinions — not our own bench testing.
Efficient, quiet operation with strong 8.4 GPM output; Hot Start Programming keeps temperatures steady on back-to-back draws with no cold-water sandwich.
Lighter PVC/CPVC venting and long allowable vent runs make it flexible to install for a condensing unit.
Condensing design adds condensate-related faults (e.g. codes 92 and 29) that don't appear on non-condensing units, plus the need for a condensate drain.
Code 11 (ignition/flame failure) — the most common Rheem gas fault — is reported here too, usually tied to gas supply or venting.
Higher upfront cost than a non-condensing RTG, and EcoNet Wi-Fi requires an accessory on non-Wi-Fi SKUs.
Rheem RTGH-84DVLN FAQ
How is it different from the IKONIC S84iN?+
Same 8.4 GPM and condensing efficiency. The RTGH-84DVLN is the value version — it drops the IKONIC's built-in Wi-Fi and LeakGuard leak protection (though it's EcoNet-capable, and Wi-Fi SKUs add LeakGuard). If you don't need smart features or leak shut-off, this gives the same hot water for less.
What condensate and venting does it need?+
As a condensing unit it produces acidic condensate and needs a nearby drain (often with a neutralizer). In return it vents with lighter PVC/CPVC — up to about 60 ft in 2-inch or 150 ft in 3-inch — rather than stainless.
What do the error codes mean?+
Code 11 is a no-ignition/flame fault (usually gas or venting). Condensing units like this can also show condensate-related codes such as 92 or 29 — often traced to condensate drainage. Keeping the drain clear and the gas/vent setup correct prevents most of them.
Is 8.4 GPM enough for my home?+
For most 2–3 bath homes, yes. In warm climates it delivers close to 8.4 GPM — three fixtures; in cold climates usable flow is around 4–5 GPM, still two simultaneous showers. Very large or very cold-climate homes should look at the 9.5 GPM RTGH-95.
What's the warranty?+
12 years on the heat exchanger — 15 with registration within 90 days — plus 5 years on parts and 1 year of labor.
Price range from leading retailers
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