Does SupplyHouse.com sell Navien tankless water heaters?

No. SupplyHouse's own Navien product page doesn't list a Navien unit for sale — it's effectively a 'we don't carry this brand' landing page that redirects shoppers to five alternatives instead: Takagi, Rinnai, Stiebel Eltron, Bosch, and EZ Tankless. That's a real gap compared to Home Depot and Lowe's, which both stock Navien's NPE line directly. If you specifically want a Navien unit, buy it through a retailer that carries it, or through a plumber with a Navien-authorized distributor account.

Is SupplyHouse.com cheaper than Home Depot or Lowe's for a tankless water heater?

Often, yes, on the same platform sold under a different name. SupplyHouse sells the pro-channel SKUs — Rheem's RTGH/RTG series rather than the retail-renamed RETEX/ECOH line Home Depot stocks — and wholesale pricing on those SKUs frequently undercuts the retail-badged equivalent. But SupplyHouse doesn't run a bundled installation service the way Home Depot does, so you're buying the unit only; get an independent installation quote separately before comparing a total cost.

What is SupplyHouse's return policy on a tankless water heater?

Most SupplyHouse product pages advertise 'no restocking fee for 90 days,' which sounds like an unusually generous policy compared to Home Depot's 90-day window or Lowe's 20% restocking fee on returned water heaters. The catch: that policy doesn't make return shipping free on a heavy item. Multiple 2026 Trustpilot reviews report return-shipping costs on bulky products running roughly 37-40% of the item's value, since a 40-80 lb tankless unit typically ships freight, not standard parcel — a cost a small plumbing part never triggers.

Can I buy a tankless water heater from SupplyHouse without a contractor account?

Yes. Unlike some plumbing wholesalers that gate pricing or ordering behind a trade account, SupplyHouse sells directly to homeowners online, no contractor credentials required. That's a meaningful difference from brands like Bradford White that sell almost exclusively through wholesalers with no public-facing retail price at all — SupplyHouse's listings are visible and orderable by anyone.

Does SupplyHouse carry Takagi tankless water heaters?

Only closeout stock. Takagi was discontinued by its parent company, A.O. Smith, effective December 31, 2025, and SupplyHouse carries the discontinuation notice across its Takagi product pages, with parts and remaining units available only while supplies last. SupplyHouse's own Navien alternatives page lists Takagi as one of five suggested substitutes for Navien — worth knowing that one of those five is itself winding down. See our Takagi tankless water heater guide for the in-production replacement model.

Tankless Water Heaters at SupplyHouse.com (2026): The Plumbing-Wholesaler Channel Big-Box Stores Skip

Quick Answer: SupplyHouse.com is a plumbing-and-HVAC wholesaler that sells directly to homeowners online, no contractor account required — and it stocks a genuinely different brand mix than the big-box stores. It carries Rheem's pro-channel RTG/RTGH line, A.O. Smith's Adapt+ (as high as $2,187.90), State's contractor-badge version of the same hardware, Eemax's electric HomeAdvantage II line (from $233), and closeout Takagi stock. The gap worth knowing before you shop: SupplyHouse doesn't carry Navien at all — its own Navien page redirects to five alternative brands instead.

Every big-box retailer we’ve reviewed on this site — Home Depot, Lowe’s, Costco, Menards, Walmart, Amazon — sells tankless water heaters as a consumer appliance, often bundled with an installation service. SupplyHouse.com is a different kind of channel entirely: a plumbing-and-HVAC wholesaler that opened its online ordering to homeowners, no trade license required, selling the same pro-grade SKUs a plumber would quote from their own distributor account. That gets you wholesale pricing on platforms the retail stores rename, but it also means a noticeably different brand lineup — and one well-known brand missing outright.

What SupplyHouse actually stocks

Brand	SupplyHouse availability	Notable line	Typical price range
Rheem	Pro-channel RTG (non-condensing) and RTGH (condensing)	RTG-95DVLN-3 / RTGH-95DVLN-3	~$1,201-$1,750+
Rinnai	Residential RE/RX line plus commercial CX series	CX199iN commercial condensing	~$1,550-$1,980+
A.O. Smith	Flagship Adapt+ and ProLine XE gas condensing	Adapt+ ATHR-199X3	~$1,092-$2,188
State (A.O. Smith's contractor badge)	Same hardware platforms as A.O. Smith, wholesale-first	UPVS-90E electric point-of-use	~$280-$1,874
Eemax	Full HomeAdvantage II electric range	HA008240 / HA018240 / HA036240	~$233-$867
Takagi	Closeout only — brand discontinued 12/31/2025	T-H3-DV-N	~$1,558 while stock lasts
Navien	Not carried — product page redirects to alternatives	n/a	n/a

Prices per current and recent SupplyHouse.com listings, checked October 2026; wholesaler pricing and stock status change frequently, so confirm the live listing before ordering.

By the numbers

$2,187.90 — SupplyHouse’s price on the A.O. Smith Adapt+ ATHR-199X3, its flagship 199,000 BTU condensing unit with X3 Scale Prevention Technology, the same figure already confirmed in our A.O. Smith tankless water heater review. — per SupplyHouse.com’s own product listing
$1,201.56 vs. $1,243.00 — a rare case where the “upgraded” unit was cheaper: SupplyHouse’s condensing Rheem RTGH-95DVLN-3 recently showed Out of Stock at the lower price, while the non-condensing RTG-95DVLN-3 sat In Stock at the higher one — a reminder to check stock status before assuming the lower-priced SKU is the one you can actually order. — per a live SupplyHouse.com snapshot
Zero — the number of Navien tankless models sold directly on SupplyHouse.com. Its own Navien product page functions as a “we don’t carry this” redirect, naming Takagi, Rinnai, Stiebel Eltron, Bosch, and EZ Tankless as alternatives instead. — per SupplyHouse.com’s Navien product page
37-40% — the share of a bulky item’s price that return shipping reportedly ran, per multiple 2026 Trustpilot reviews of SupplyHouse.com, despite the site’s “no restocking fee for 90 days” messaging on most product pages. — per Trustpilot customer reviews

1. A.O. Smith Adapt+ ATHR-199X3 — Best Wholesale-Channel Flagship

A.O. Smith Adapt+ ATHR-199X3

Condensing gas · 199,000 BTU · 10.5 GPM peak · 0.95 UEF · $2,187.90 at SupplyHouse

X3 Scale Prevention Technology is rated by A.O. Smith to extend heat-exchanger life by up to 300% in hard-water homes — see our hard water guide for whether that upgrade is worth the premium over the non-X3 ProLine XE platform.
SupplyHouse sells this unit at the same wholesale price point we've already confirmed independently, consistent pricing across the two checks rather than a one-time promo.
No contractor account needed — SupplyHouse's listing is open to any homeowner, unlike some wholesalers that gate pricing behind a trade login.

Check price on Amazon →

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2. Eemax HA018240 — Best SupplyHouse Pick for a Small Home

Eemax HA018240

Electric point-of-use/small-home · 18 kW/240V · 75A · $399.99 at SupplyHouse

Lowe's lists the identical model at $449.00 — a $49.01 gap on the exact same SKU, worth checking before assuming either retailer is automatically cheaper.
No gas line or venting required, the main appeal of an electric unit at this size — see our electrical requirements guide to confirm your panel can support the 75A draw before ordering.
Eemax is Rheem's own sister brand under parent company Paloma Industries, not an unrelated budget import, per our Eemax tankless water heater review.

Check price on Amazon →

What a SupplyHouse price doesn’t cover

Wholesale pricing and open online ordering make SupplyHouse worth checking before you buy from a big-box store — but two things work differently than shopping a consumer retailer:

No bundled installation. Home Depot and Costco both run (or partner on) an installation service you can book alongside the purchase. SupplyHouse sells the unit only — you’re sourcing your own licensed plumber, which can mean more quotes to compare but also more legwork than a one-stop big-box checkout.
“No restocking fee” isn’t the same as free return shipping. Most SupplyHouse product pages advertise no restocking fee within 90 days, a genuinely better headline than Lowe’s 20% restocking fee on a returned water heater. But a 40-80 lb tankless unit typically ships via freight rather than a standard parcel carrier, and multiple 2026 Trustpilot reviews describe return-shipping costs running 37-40% of the item’s price on bulky products — worth confirming the actual return-shipping cost for your specific model before ordering, not just the restocking-fee headline.
Navien isn’t an option here at all. If a Navien NPE unit is what you’ve settled on after comparing brands, SupplyHouse’s own catalog won’t get you there — its Navien page redirects to Takagi, Rinnai, Stiebel Eltron, Bosch, and EZ Tankless instead, and one of those five (Takagi) is itself a closeout-only brand. Our Navien tankless water heater review and Home Depot guide cover retailers that do carry the NPE line directly.

The bottom line

SupplyHouse.com fills a real gap between the big-box retailers and a plumber’s own distributor account — pro-channel Rheem, A.O. Smith, State, and Eemax pricing, open to any homeowner, no trade credentials required. The two things worth checking before you order: confirm the brand you want is actually sold here (Navien isn’t, full stop), and price out the real return-shipping cost on a heavy unit rather than trusting the “no restocking fee” headline alone, since freight shipping on a bulky return has reportedly run over a third of the item’s value. For brands that do sell through standard retail channels with bundled installation, our Home Depot tankless water heater guide and Costco tankless water heater guide cover that side of the market, and our best tankless water heater guide ranks the full brand field regardless of where you ultimately buy.

Check the A.O. Smith Adapt+ price on Amazon →