Eljer Triangle Corner-Fit Two-Piece 1.6 GPF Toilet

The Eljer Triangle positioning — the corner toilet

The Eljer Triangle (091-2070) solves a specific architectural problem: placing a toilet in a tight corner where a standard rectangular tank won't fit. Its tank is triangular — pointing into a 90° corner with the flat face facing into the room. This is the toilet for bathrooms with 36"-48" diagonal corners where a normal toilet would either project too far into the floor space or block a door swing.

At $310-$420, the Triangle is significantly more expensive than mainstream two-piece toilets. The premium reflects two realities: (1) the triangular tank is a specialty production run with much lower unit volume than standard rectangular tanks, and (2) the Triangle is one of only two corner-toilet SKUs still in US residential production (the other is the Crane Spree). With minimal direct competition, Mansfield-Eljer prices the Triangle as a specialty product, not a mainstream value SKU.

When the Triangle is the right answer

You need a corner toilet if:

• Your bathroom is under 36 sq ft and a standard toilet would block the door swing or vanity access
• You have a powder room under stairs where the ceiling angles down and only the corner has full headroom
• You're renovating a 1920s-1940s bathroom where the original toilet was corner-installed (these were more common pre-WWII)
• You have an existing corner toilet that needs replacement and want to maintain the original architectural intent
• You're designing a tiny home, RV conversion, or accessory dwelling unit (ADU) with floor-space constraints

When the Triangle is the WRONG answer

• You have a standard rectangular bathroom with adequate floor space — a normal toilet is cheaper, easier to install, and easier to maintain
• You need WaterSense certification for utility rebates — Triangle is 1.6 GPF only
• You need ADA compliance — Triangle is 15.5" standard height, below the 17-19" ADA range
• You want big-box availability — Triangle is supply-house special-order only, with 4-8 week lead times typical
• You want modern flush technology — Triangle uses standard gravity flush, no canister or pressure-assist

Why corner toilets are so rare in 2026

Corner toilets were common in American homes from 1920-1960 — particularly in compact urban apartments and tiny suburban half-baths. As bathroom design shifted toward larger rooms with standardized rectangular layouts in the 1960s-1980s, demand for corner toilets collapsed. By the 1990s, most American sanitaryware manufacturers (Kohler, American Standard, TOTO, Mansfield, Crane) had discontinued their corner toilet lines.

Eljer maintained the Triangle line continuously because (a) Mansfield-Eljer's plumbing-supply-house channel still received steady demand from owners of pre-1960 homes needing replacements, and (b) the architectural movement toward tiny homes and ADUs starting in the 2010s rebuilt corner-toilet demand. Today the Triangle and the Crane Spree are the only two corner-toilet SKUs in active US production.

Critical install considerations for corner toilets

• The floor flange must be positioned correctly. A corner toilet uses a standard 12-inch rough-in, but the flange position is measured from the corner, not from a flat wall. If your corner doesn't have an existing toilet flange in the right position, a plumber must cut into the floor to relocate the waste line.
• Wall angles matter. The Triangle assumes a 90° corner. If your corner is out-of-square (common in older homes), the triangular tank won't sit flush against both walls — you'll have visible gaps that require caulk filling.
• Supply-line routing changes. Standard supply lines come from a wall-mounted shutoff valve. For a corner toilet, the supply line typically comes through the floor near the corner, OR through one of the corner walls. Plan this before purchase.
• Tile and floor patterns. The triangular footprint of the Triangle creates an awkward floor pattern when removed for service — older tile floors with a "phantom triangle" in the corner often need patching when a corner toilet is replaced.

The Triangle variant matrix

What's in the box

• Triangular tank with pre-installed 3-inch flush valve + Eljer 3-inch shank fill valve
• Corner-fit bowl (elongated), pre-drilled for 12" rough-in (corner-flange position)
• Eljer-specific corner tank-to-bowl gasket and brass bolts
• Chrome corner-position trip lever
• Wax ring NOT included
• SoftClose seat NOT included — Bemis 1500EC elongated universal works
• Installation manual specific to corner installation

Install procedure (90-120 minutes — corner installs are slower)

1. Verify floor flange is positioned correctly for corner installation (12-inch from corner along each wall).
2. If existing toilet was also corner-style: remove, scrape wax ring, inspect flange.
3. If existing toilet was standard rectangular: this is a major plumbing job — flange must be relocated to corner position, typically requires opening the floor.
4. Install new wax ring (flat — Triangle bowl outlet is standard horn-less geometry).
5. Set corner bowl, ensuring the triangular bowl-to-tank mating face is centered relative to the corner walls. Hand-tighten flange bolts.
6. Verify bowl is plumb to both corner walls (level perpendicular to each wall).
7. Install Eljer corner tank-to-bowl gasket. Set triangular tank onto bowl. Hand-tighten tank bolts (note: tank bolts are oriented differently than standard rectangular tanks).
8. Connect supply line. Open shutoff valve. Test flush.
9. Apply caulk between tank/bowl and corner walls IF gaps exist (out-of-square corner).
10. Install seat (sold separately).

What owners report

• The Triangle solves a real problem. Owners specifically mention "the only toilet that would fit my under-stairs powder room" or "saved me from gutting the bathroom to relocate the toilet to a non-corner position."
• Flush performance is solid at MaP 900g — between Hamilton (1000g) and Patriot (800g).
• The corner tank-to-bowl gasket is Eljer-specific — when this needs replacement (typically 15-20 years in), it must be sourced through Mansfield-Eljer customer service, not from Home Depot.
• Out-of-square corner walls are the #1 install complaint — older homes commonly have 88°-92° corners (not true 90°), causing visible gaps that require caulk filling.
• Service life: 25-30 years porcelain — same Mansfield-Eljer heavy ceramic mix.
• Replacement tank lid (if cracked) runs $180-$280 — triangular tank lids are not aftermarket products; must be sourced through Mansfield-Eljer.

Direct comparison — Triangle vs Crane Spree (the only other US corner toilet)

The verdict

Buy Triangle if:

• You need a corner toilet specifically (architecture demands it)
• You want 1.6 GPF for old-drainline carry performance
• You want the best corner-toilet warranty available (lifetime porcelain + 5-year trim)
• You're replacing an existing Eljer Triangle (color/style match)

Skip and choose Crane Spree if:

• You need WaterSense 1.28 GPF for utility rebates
• You want Comfort Height 16.5" instead of standard 15.5"

Skip and don't buy a corner toilet at all if:

• You have a standard rectangular bathroom layout — a normal toilet is 50-70% cheaper, easier to install, and easier to maintain
• Your corner is significantly out-of-square (older homes) — the visible gap problem may make a corner toilet look worse than a standard toilet positioned along a flat wall

Warranty

Eljer Triangle warranty: Lifetime on porcelain (including triangular tank), 5 years on tank trim, 1 year on accessories. Mansfield-Eljer-administered. Note: triangular tank lid replacement is sourced direct through Mansfield customer service, not through standard parts channels.

Pricing reality (2026)

Triangle 091-2070 (White): $310-$380 through Ferguson, Winsupply, Hajoca special-order (4-8 week lead time typical). Build.com: $329-$399. Home Depot: not stocked; special-order $349-$429 with extended lead times. Biscuit/Bone variants +$30-$50. Note: Triangle is one of the few toilet SKUs where the supply-house price beats big-box on availability AND price.