Home Depot is the single biggest brick-and-mortar channel for tankless water heaters in the US, which makes it a reasonable place to start shopping — but “buy the cheapest listing” skips two things that matter more than the sticker price: whether that SKU is the retail or pro version of the hardware, and what happens if you need to return or service it after a plumber has already hooked it up. Here’s what’s actually on the shelf, what it costs, and the fine print worth reading before checkout.
What Home Depot actually stocks
| Brand | Home Depot availability | Notable line | Typical price range |
|---|---|---|---|
| Rheem | Deepest catalog — Home Depot is Rheem's primary retail partner | RETEX (electric) / ECO / ECOH / ECOHS (gas retail lines) | ~$519-$1,799 |
| Rinnai | Full residential lineup, indoor and outdoor | RE-series non-condensing, Sensei RX/RXP condensing | ~$1,280-$1,725+ |
| Navien | Dedicated brand page, condensing NPE line | NPE-A2/S2 series | ~$1,400-$1,900 |
| Bosch | Point-of-use Tronic series | Tronic 3000 US7/US9 | ~$180-$280 |
| EcoSmart | Whole-home electric ECO line | ECO 18/24/27 | ~$400-$650 |
| Camplux | Budget gas and outdoor units | WA686MG-NGN and similar | ~$250-$450 |
Prices per current Home Depot listings as of September 2026; retail pricing fluctuates with sale cycles, so confirm the current listing before assuming a figure above still holds.
By the numbers
- $1,280.79 vs. $1,391.40 list — the current Home Depot price on the Rinnai RE199iN, an 8% discount off list, with a further per-unit drop to $1,152.71 when buying 3 or more (a detail worth knowing if you’re outfitting a multi-unit rental property). — per Home Depot’s own product listing
- $2,400-$5,400 — the typical nationwide total for a professionally installed tankless water heater booked through Home Depot’s own installation service, which dispatches a licensed, background-checked local contractor rather than a Home Depot employee. — per Home Depot’s services pages
- 90 days, or 365 with a Home Depot credit account — the standard return window on an uninstalled unit; connect it to a gas, water, or electrical line and you’re on the manufacturer’s warranty instead, not Home Depot’s return counter. — per Home Depot’s published return policy
1. Rheem Performance Platinum ECOH200DVELN-3 — Best Home-Depot-Exclusive Retail Line
Rheem Performance Platinum ECOH200DVELN-3
- Sold under Home Depot's retail-specific ECOH naming — the same condensing platform a plumber would quote as the pro-channel RTGH, per our Rheem lineup guide's decoder for the brand's dual retail/pro catalog.
- At roughly $1,199, it undercuts Rheem's flagship IKONIC ECOHS200iN ($1,799 list, sometimes marked down as much as 20% during sale periods) by a wide margin for most of the same condensing efficiency.
- Home Depot's Pro Xtra or store credit card extends the standard 90-day return window to a full year on an uninstalled unit — worth applying for before a large appliance purchase if you don't already have the card.
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2. Rinnai RE199iN — Best Home Depot Discount on a Whole-Home Unit
Rinnai RE199iN
- Nearly flagship flow at a real discount off list — $110.61 less than the printed price, with volume pricing dropping further per unit at 3 or more.
- As a non-condensing unit it needs standard venting, not the PVC condensate setup a condensing model requires — see our venting guide before assuming your existing vent run works for either type.
- Home Depot's own installation service can quote and install this exact SKU, but get a second quote from an independent plumber first — the $2,400-$5,400 nationwide installed range leaves real room to shop the labor separately from the unit.
What a discounted Home Depot price doesn’t cover
A low sticker price is only part of the total cost. Two things trip people up after checkout:
- Retail vs. pro naming. Rheem in particular runs two parallel catalogs for the same hardware — retail SKUs at Home Depot (RETEX, ECO, ECOH, ECOHS) and pro SKUs through plumbing supply (RTEX, RTGH). A plumber quoting you an “RTGH” isn’t necessarily selling a different or better unit than the “ECOH” model on Home Depot’s shelf — confirm the actual platform, not just the name, before assuming one price beats the other.
- Installation is a separate line item. Home Depot’s own tankless water heater installation service dispatches a licensed local contractor and quotes the job independently of the unit price — it isn’t bundled into the shelf price the way it might feel at checkout. Get that quote (or an independent plumber’s) before comparing a Home Depot listing against a fully-installed price elsewhere, since the $2,400-$5,400 nationwide installed range can easily double the cost of the unit itself.
The bottom line
Home Depot is a legitimate, well-stocked channel for a tankless water heater — Rheem, Rinnai, Navien, Bosch, EcoSmart, and Camplux are all genuinely available, and the pricing on units like the Rinnai RE199iN or Rheem’s Performance Platinum line regularly beats list. The two things worth double-checking before you buy: whether the “retail” SKU on the shelf is the same hardware a plumber would quote you under a different name, and that the 90-day (or 365-day, with a Home Depot credit account) return window only protects a unit that hasn’t been connected yet — after that, you’re relying on the manufacturer’s warranty. For the full field of brands ranked side by side regardless of where you buy, see our best tankless water heater guide.