Which tankless water heater brands does Lowe's actually stock?

Lowe's is A.O. Smith's primary big-box retail channel — the way Home Depot is Rheem's — and carries A.O. Smith's full Signature Select gas line plus its wide-range Signature electric line. Beyond A.O. Smith, Lowe's also stocks Rinnai (the Sensei RX series), EcoSmart's electric ECO and ECOS lines, and Bosch's Tronic point-of-use units. Rheem, by contrast, is much thinner on Lowe's shelves than on Home Depot's, since Home Depot is Rheem's primary retail partner.

What's Lowe's return policy on a tankless water heater?

Stricter than most shoppers expect. A tankless water heater is classified as a major appliance, so you have only 48 hours after delivery or pickup to report a defect once the box is opened. An unopened, uninstalled unit can still be returned within 30 days, but Lowe's deducts a 20% restocking fee from the refund unless the purchase was made on a qualifying Lowe's credit account, which waives it. That's a real difference from Home Depot's policy, which gives an uninstalled unit 90 days (365 with a Home Depot credit account) and doesn't apply a restocking fee.

Does Lowe's install tankless water heaters, or do I need my own plumber?

Lowe's runs the job through a network of independent, licensed, background-checked, and insured contractors rather than its own employees — a similar model to Home Depot's installation service. You request a free consultation, an installer quotes the job separately from the unit price, and typical nationwide installed cost runs roughly $2,500-$4,500 for a tankless conversion, in the same range as Home Depot's $2,400-$5,400. Get a second quote from an independent plumber before booking either way.

Is the A.O. Smith model at Lowe's the same unit a plumber would install?

Usually yes, under a different model number. A.O. Smith runs a retail-vs-wholesale naming split similar to Rheem's: the Signature Select GT15-series sold at Lowe's shares its core platform with the ATI-series A.O. Smith sells through plumbing wholesalers like Ferguson and SupplyHouse. The GT15-510C-I (10 GPM, 199,000 BTU) is the Lowe's-facing name for essentially the same condensing hardware the wholesale ATI-540H-N ships as — confirm the GPM, BTU, and UEF match before assuming two differently-named units are actually different products.

Is a Lowe's tankless water heater price better than buying direct or through a wholesaler?

Sometimes, but not reliably enough to skip comparing. A.O. Smith's Signature electric point-of-use and whole-home units are genuinely retail-priced at Lowe's — the Signature R2VR-140E runs $349.00 there, for instance. On the gas condensing side, plumbing wholesalers like Ferguson and SupplyHouse frequently undercut big-box retail once you're comparing the same platform under its wholesale name, so it's worth pricing both channels before you buy rather than assuming a store shelf is automatically the better deal.

Tankless Water Heaters at Lowe's (2026): What's on the Shelf, and Why the Return Window Is Shorter Than You'd Guess

Quick Answer: Lowe's is A.O. Smith's primary retail channel — the Signature Select gas line and wide-range Signature electric line are both on the shelf — and it also carries Rinnai's Sensei series, EcoSmart's electric lineup, and Bosch's Tronic point-of-use units. Prices can be genuinely competitive: the A.O. Smith Signature R2VR-140E runs $349.00 at Lowe's. The catch is the return policy — a tankless water heater is a major appliance with only a 48-hour defect-report window once opened, and a restocking fee of 20% applies to an uninstalled-but-opened return unless you hold a Lowe's credit account, both stricter than Home Depot's comparable terms.

Lowe’s and Home Depot look interchangeable from the parking lot, but their tankless water heater shelves — and the fine print behind them — aren’t the same. Lowe’s leans A.O. Smith where Home Depot leans Rheem, and its return policy on an appliance this size is meaningfully less forgiving once you’ve opened the box. Here’s what’s actually stocked, what it costs, and what to check before you buy.

What Lowe’s actually stocks

Brand	Lowe's availability	Notable line	Typical price range
A.O. Smith	Deepest catalog — Lowe's is A.O. Smith's primary retail channel	Signature Select GT15-series (gas) / Signature (electric)	~$349-$1,200+
Rinnai	Full residential Sensei RX lineup, indoor and outdoor	RX199iN condensing (still listed under the retired RU199iN name on some product pages)	~$1,530-$1,725
EcoSmart	Wide electric lineup, point-of-use through whole-home	ECO and ECOS series, 11-35 kW	~$230-$700
Bosch	Point-of-use Tronic series	Tronic 3000	~$180-$280

Prices per current Lowe's and cross-retailer 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

48 hours — how long you have to report a defect on a tankless water heater once it’s been delivered, opened, or installed at Lowe’s, since major appliances fall under a stricter reporting window than smaller purchases. — per Lowe’s published returns policy
20% restocking fee — the deduction Lowe’s applies to an unopened, uninstalled major-appliance return made within the standard 30-day window, waived only if the purchase was made on a qualifying Lowe’s credit account. — per Lowe’s published returns policy
$349.00 — the current Lowe’s price on the A.O. Smith Signature R2VR-140E, a 14 kW electric point-of-use unit with no venting required. — per Lowe’s product listing

1. Rinnai RX199iN — Best Full-Lineup Pick at Lowe’s

Rinnai Sensei RX199iN

Condensing gas · 199,000 BTU · up to 11 GPM · 0.98 UEF · ~$1,530-$1,725 street

Lowe's still lists this platform under product-page titles carrying the retired RU199iN name in places — the same RU-to-RX rebrand our Rinnai lineup guide covers in detail, so don't assume an "RU" listing is old stock; confirm the actual SKU on the box.
A 15-year heat-exchanger warranty and indoor/outdoor flexibility make it the residential flagship most plumbers default to regardless of which retailer sold it.
Non-condensing and condensing Rinnai models look similar on the shelf — verify you're buying the condensing RX (not the non-condensing RE) if PVC venting is what your install is set up for.

Check price on Amazon →

Get your tankless heater and fittings in two days — try Amazon Prime free for 30 days.

2. A.O. Smith Signature Select GT15-510C-I — Best Lowe’s-Exclusive Naming to Decode

A.O. Smith Signature Select GT15-510C-I

Condensing gas · 199,000 BTU · 10 GPM · Lowe's-facing model number

Same core platform as the wholesale-channel ATI-540H-N our A.O. Smith brand guide covers at $1,092.32 through Ferguson — A.O. Smith runs a retail-vs-pro naming split similar to Rheem's, just with "GT15" instead of "RTGH" as the wholesale-name giveaway.
Before assuming a Lowe's listing beats a plumbing-wholesaler price (or vice versa), match the GPM, BTU, and UEF between the two model numbers — the hardware is frequently identical even when the name isn't.
Lowe's also carries the smaller GT15-310C-I (8 GPM, 190,000 BTU) for households that don't need the full 10 GPM ceiling.

Check price on Amazon →

What a Lowe’s price doesn’t cover

The sticker isn’t the whole story. Two things catch people off guard after checkout:

The return window is genuinely shorter. A tankless water heater counts as a major appliance at Lowe’s, which means a 48-hour window to report a defect once it’s delivered or opened — not the 30-90 days you’d expect for a smaller purchase. Even an unopened, uninstalled unit only gets a plain 30-day return, and a 20% restocking fee applies unless you paid with a Lowe’s credit account. Compare that to Home Depot, whose uninstalled-unit return window runs 90 days (365 with a store credit account) with no restocking fee — a real difference if you’re not sure the unit you’re buying is the right size until it’s on the wall.
Installation is a separate quote, same as everywhere else. Lowe’s doesn’t send its own employees — it dispatches an independent, licensed, background-checked, and insured contractor from its installer network, and that contractor quotes the labor separately from the unit price. Nationwide installed cost for a tankless conversion typically runs $2,500-$4,500, close to Home Depot’s $2,400-$5,400 range, so get that number in writing (and a second quote from your own plumber) before treating the shelf price as the total cost.

The bottom line

Lowe’s is a legitimate, well-stocked channel for a tankless water heater — A.O. Smith, Rinnai, EcoSmart, and Bosch are all genuinely available, and A.O. Smith’s electric Signature line in particular is priced competitively at retail. The two things worth double-checking before you buy: whether the model number on the shelf is a retail-only name for hardware sold elsewhere under a different SKU, and that you understand the 48-hour defect window and 20% restocking fee before you open the box — Lowe’s return terms on a major appliance are notably less forgiving than Home Depot’s. For the full field of brands ranked side by side regardless of where you buy, see our best tankless water heater guide.

Check the Rinnai RX199iN price on Amazon →