Rheem RTG-70DVLN-3
Amazon customer rating as of
Tankless Geek editorial score: 4.2/5
The Rheem RTG-70DVLN-3 is the indoor, direct-vent member of Rheem's mid-efficiency (non-condensing) RTG line — 160,000 BTU/h and 7.0 GPM on natural gas at 0.82 UEF. The 'DV' denotes direct vent and 'LN' low-NOx. It's positioned as the value indoor gas tankless: more affordable than the condensing RTGH/IKONIC units, with the same Hot Start Programming that keeps the unit primed to avoid cold-water bursts on back-to-back use.
As a non-condensing unit it uses conventional (category III stainless or concentric) venting rather than PVC, and it's compact — about 14 in wide with tight side clearances for a small-space install. It modulates across its BTU range, includes LeakGuard leak detection on Wi-Fi models, and delivers a solid 7.0 GPM for a small-to-medium home. Its indoor rating is the trade-off: the direct-vent install is more involved than its outdoor XLN sibling, which is reflected in owner feedback.
Key Features
Best Use Cases
Our Verdict
The RTG-70DVLN-3 is a sensible, budget-conscious indoor gas tankless — 7.0 GPM covers a small-to-medium home, and Hot Start smooths out the classic tankless temperature dips. Its owner rating runs lower than the outdoor XLN version, and the pattern in feedback points to installation and venting complexity plus the Code 11 ignition fault that recurs across Rheem's gas line, rather than a flaw in the core unit. Our take: a fair-value indoor choice if you have (or are paying for) a proper direct-vent install and don't need condensing efficiency — but insist on correct gas-line sizing and venting, since that's where owner frustration concentrates. If your install can go outdoors, the RTG-70XLN-3 skips venting entirely and tends to leave owners happier.
Technical Specifications
| Max gas input | 160,000 BTU/h |
|---|---|
| Max flow rate | 7.0 GPM |
| Efficiency (UEF) | 0.82 · non-condensing |
| Installation | Indoor, direct vent |
| Venting | Category III stainless / concentric (non-condensing) |
| Emissions | Low-NOx |
| Hot Start | Yes — reduces cold-water bursts on back-to-back use |
| Leak protection | LeakGuard on Wi-Fi models |
| Dimensions (W×H×D) | 13.9 × 25.6 × 10.2 in |
| Weight | ≈46.5 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 (160,000 BTU × 0.82 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) | 7 GPM |
| 45 °F | Mild climate (65 °F in → 110 °F) | 5.8 GPM |
| 60 °F | Cool climate (50 °F in → 110 °F) | 4.4 GPM |
| 70 °F | Cold climate (40 °F in → 110 °F) | 3.7 GPM |
Usable flow calculated from rated output (160,000 BTU × 0.82 UEF), capped at the unit's 7.0 GPM maximum.
Pros
Cons
Buy it if…
- Small-to-medium homes wanting an indoor gas tankless on a budget
- Installs that can properly accommodate direct venting
- Owners who value Hot Start's smoother back-to-back hot water
- Buyers who don't need condensing efficiency
Skip it if…
- Anyone who can mount outdoors — the RTG-70XLN-3 avoids venting hassle
- Efficiency-focused buyers — a condensing RTGH cuts gas use
- Cold-climate homes with heavy simultaneous demand (flow drops)
- DIY installers uncomfortable with gas sizing and venting
Installation Requirements
Professional vs DIY
Gas and Category III venting make a licensed installer the safe route; DIY risks the 12–15-year warranty.
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 (3.9/5 Amazon customer rating, 97 ratings, as of 2026-08-23). These are owner opinions, not our own bench testing.
Solid 7.0 GPM value for a non-condensing indoor unit, with Hot Start Programming smoothing out back-to-back hot-water use.
Compact chassis with tight side clearances suits small mechanical spaces.
The indoor direct-vent install is more involved than the outdoor version — venting and gas-line sizing are recurring pain points, and its owner rating trails the XLN sibling.
Code 11 (ignition/flame failure) is the most frequently reported Rheem gas fault; owners often trace it to gas supply or venting.
Non-condensing efficiency (0.82 UEF) means higher gas use than a condensing RTGH, and flow drops in cold climates.
Rheem RTG-70DVLN-3 FAQ
Why does this model rate lower than the outdoor RTG-70XLN-3?+
The core unit is essentially the same; the difference is installation. The indoor DVLN requires direct venting, and owner frustration concentrates on venting and gas-line sizing rather than the heater itself. A correct professional install addresses most of it — but if you can mount outdoors, the XLN skips venting entirely.
What is Code 11?+
Code 11 is a no-ignition / flame-failure fault and the most common Rheem gas error. It usually points to gas supply (line sizing, pressure) or venting. It often clears with a reset, but repeated Code 11s mean the gas or vent setup needs checking.
Is it condensing?+
No — it's non-condensing at 0.82 UEF, which keeps the price down and uses conventional stainless venting rather than PVC. A condensing RTGH-84DVLN is more efficient but costs more and needs a condensate drain.
How much hot water does 7.0 GPM give me?+
Up to 7.0 GPM in warm climates — two showers plus a sink. In cold climates usable flow falls toward 3.5–4.5 GPM, closer to two fixtures. It suits a small-to-medium home.
What's the warranty?+
12 years on the heat exchanger — 15 years if you register within 90 days — plus 5 years on parts and 1 year of labor.
Product sources
Specifications verified 2026-08-23. Manufacturer documents are treated as the primary source for model specifications. Retailer pages are used only for customer ratings and owner-feedback themes.
- Rheem — RTG Series non-condensing indoor (RTG-70DVLN-3) (accessed 2026-08-23)
- Amazon — Rheem RTG-70DVLN-3 listing (rating & buyer reviews) (accessed 2026-08-23)
- Rheem tankless error-code reference (Code 11 and others) (accessed 2026-08-23)
Price range from leading retailers
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