Rheem RTGH-84DVLN
Amazon customer rating as of
Tankless Geek editorial score: 4.5/5
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.
Technical Specifications
| Max gas input | 157,000 BTU/h |
|---|---|
| Min gas input (modulation) | 11,000 BTU/h |
| Max flow rate | 8.4 GPM |
| Activation flow | 0.40 GPM |
| Efficiency (UEF) | 0.93 · condensing (ENERGY STAR) |
| Venting | PVC/CPVC — up to 60 ft (2 in) / 150 ft (3 in) |
| Hot Start | Yes — eliminates cold-water bursts |
| Overheat protection | Overheat Film Wrap on heat exchanger |
| Connectivity | EcoNet-capable; LeakGuard on Wi-Fi models |
| Dimensions (W×H×D) | 18 × 23 × 9 in |
| Weight | ≈75 lb |
| Warranty | 12 yr heat exchanger (15 yr w/ registration) · 5 yr parts · 1 yr labor |
Specifications verified against the linked source documents. See Sources below.
How much hot water you'll actually get
Usable flow drops as incoming water gets colder. Figures are calculated from rated output (157,000 BTU × 0.93 UEF) and labeled as such — not bench-tested by us.
| Temperature rise | Typical scenario | Usable flow |
|---|---|---|
| 35 °F | Warm climate (75 °F in → 110 °F) | 8.3 GPM |
| 45 °F | Mild climate (65 °F in → 110 °F) | 6.5 GPM |
| 60 °F | Cool climate (50 °F in → 110 °F) | 4.9 GPM |
| 70 °F | Cold climate (40 °F in → 110 °F) | 4.2 GPM |
Usable flow calculated from rated output (157,000 BTU × 0.93 UEF), capped at the unit's 8.4 GPM maximum.
Pros
Cons
Buy it if…
- 2–3 bathroom homes wanting efficient, high-volume gas hot water
- Owners who want condensing efficiency (~0.93 UEF) to cut gas bills
- Installs where lighter PVC/CPVC venting is an advantage
- Buyers who want IKONIC-level performance without paying for smart features
Skip it if…
- Buyers who specifically want leak protection or built-in Wi-Fi — see IKONIC S84iN
- Installs with no condensate drain nearby
- Small homes with light demand — a non-condensing RTG costs less
- Anyone wanting the absolute simplest, cheapest gas unit
Installation Requirements
Professional vs DIY
A condensing whole-home unit — gas, sealed venting, and condensate make this a licensed-pro install.
Gas and electrical work should be done by a licensed professional, and most installs require a permit and must meet local building codes — DIY work can void the manufacturer warranty. Always confirm the unit's own manual for exact clearances, venting, and sizing.
What owners report
Themes summarized from retailer customer feedback (4.3/5 Amazon customer rating, 50 ratings, as of 2026-09-13). These are 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.
Product sources
Specifications verified 2026-09-13. Manufacturer documents are treated as the primary source for model specifications. Retailer pages are used only for customer ratings and owner-feedback themes.
- Rheem RTGH Series official specification sheet (PDF) (accessed 2026-09-13)
- SupplyHouse — Rheem RTGH-84DVLN-3 specifications (accessed 2026-09-13)
- Rheem tankless error-code reference (RTG & RTGH series) (accessed 2026-09-13)
Price range from leading retailers
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