Eljer Aqua-Saver II Dual-Flush Two-Piece Elongated 1.28/0.8 GPF Toilet

The Eljer Aqua-Saver II positioning — Eljer's water-conservation flagship

The Eljer Aqua-Saver II (091-7110) is the brand's dual-flush water-conservation flagship. It uses 1.28 GPF for solid-waste flushes and 0.8 GPF for liquid-only flushes, yielding an EPA-calculated effective average of 1.06 GPF (based on the EPA's 1 solid : 2 liquid daily-use ratio). This effective rate qualifies the Aqua-Saver II for WaterSense Most Efficient certification — a tier above standard WaterSense — and unlocks the highest tier of utility rebates ($100-$250 in CA, AZ, TX, NV vs $50-$100 for standard WaterSense).

At $240-$320, the Aqua-Saver II is Eljer's most water-efficient toilet. It competes with Kohler Persuade Curv ($380-$520), Toto Aquia IV Dual-Flush ($440-$580), and Niagara Stealth Dual-Flush ($290-$390) in the dual-flush 1.28/0.8 GPF segment. The Aqua-Saver II is the value-pricing option in this segment with full Eljer brand pedigree and best-in-class warranty terms.

The water-savings math — why dual-flush matters

The EPA assumes a typical 4-person household generates 5 toilet flushes per person per day (20 total daily flushes). At a 1 solid : 2 liquid ratio, that's 6.7 solid-waste flushes and 13.3 liquid-only flushes per day.

At $0.005-$0.012 per gallon (typical US municipal water rate), 3,942 gallons saved annually equates to $20-$47 per year in water bill savings — meaningful over a 20-year service life ($400-$940 lifetime savings) plus the one-time $100-$250 utility rebate. The Aqua-Saver II's premium over a standard WaterSense Eljer Patriot ($60-$80) pays back through rebate alone.

The dual-flush mechanism — what's actually inside

The Aqua-Saver II uses an Eljer-proprietary dual-flush cartridge. Press the larger button (left side of top-mount) for the 1.28 GPF full flush. Press the smaller button (right side) for the 0.8 GPF half flush. The cartridge mechanism:

• Full flush: Cartridge lifts a 3-inch flapper-equivalent disc with a 7-second open duration. Tank empties to ~25% (1.28 GPF water release).
• Half flush: Cartridge lifts the same disc with a 4-second open duration. Tank empties to ~55% (0.8 GPF water release).
• Service life: ~15 years average. After 15 years, cartridge can fail (jamming open or failing to seal). Replacement cartridge is Eljer 091-7115 ($45-$60), Eljer-only — Korky/Fluidmaster equivalents do NOT fit.

The Aqua-Saver II variant matrix

What's in the box

• Tank with pre-installed Eljer dual-flush cartridge + 3-inch shank fill valve
• Elongated bowl (18.5"), Velvet glaze, pre-drilled for 12" rough-in
• Eljer tank-to-bowl gasket and brass bolts
• Chrome top-mount dual-flush button assembly
• Wax ring NOT included
• SoftClose seat NOT included
• Installation manual + WaterSense Most Efficient certificate (for utility rebate paperwork)

Install considerations specific to dual-flush

• Top-mount push button placement — the button is on the tank top, not the side. If your bathroom layout has a shelf or window above the tank, verify there's clearance for the push-down motion.
• Tank lid is custom-fit for the dual-flush button assembly — you can't swap a standard Eljer tank lid onto the Aqua-Saver II tank.
• Cartridge orientation matters — when installing, the cartridge must be aligned with the button rod. Eljer install manual has the rotation alignment marks; follow them.
• WaterSense Most Efficient certificate — keep this. Many utilities require it for the higher-tier rebate (typically the $200-$250 tier, vs $50-$100 for standard WaterSense).

The half-flush limitation — what owners need to know

The 0.8 GPF half-flush is designed for liquid-only flushes. It is intentionally weaker than the full flush. Two practical implications:

• Don't use the half-flush for solid waste. Owners who try this consistently report incomplete bowl evacuation. Always use the full flush for solid-waste removal.
• Half-flush may not clear toilet paper buildup. If a household uses thick or multi-ply paper, owners report that 4-5 half-flushes can accumulate paper at the trapway. Periodic full-flush reset is needed.

This is not an Eljer-specific issue — every dual-flush 0.8 GPF mechanism has the same trade-off. Kohler Persuade Curv, TOTO Aquia IV, and Niagara Stealth Dual-Flush all share this characteristic. The 0.8 GPF half-flush is a deliberate water-savings choice that requires user awareness of when to use full vs half.

What owners report

• Utility rebate redemption works as advertised — owners specifically mention receiving $150-$250 rebate checks from CA, AZ, TX water utilities after submitting WaterSense Most Efficient certificate + purchase receipt.
• Daily water bill reduction is measurable — typical owners report $15-$30 reduction in monthly water bill within 60 days of replacing a 1.6 GPF toilet with the Aqua-Saver II.
• Half-flush 0.8 GPF performs adequately for liquid-only.
• Dual-flush cartridge service life: ~15 years average. After that, replacement cartridge install takes 30-45 minutes; not a difficult repair but requires the specific Eljer part.
• Top-mount button placement is initially unintuitive for guests used to side-mount trip levers. Most households adapt within 1-2 weeks.
• The 091-7110 commands strong resale value in green-renovation markets (Pacific Northwest, California) — owners selling homes specifically mention the WaterSense Most Efficient certification in listings.

Aqua-Saver II vs the dual-flush competition

The verdict

Buy Aqua-Saver II if:

• You live in a high-water-rate area (CA, AZ, NV, TX, FL) where rebate + bill savings justify the dual-flush premium
• Maximum water savings + WaterSense Most Efficient rebate eligibility is the priority
• You're matching to an existing Eljer install
• 5-year tank trim warranty + lifetime porcelain matters
• You can accept the proprietary cartridge service path (~15 years to first cartridge replacement)

Skip and choose Niagara Stealth Dual-Flush if:

• Absolute maximum water savings is the priority (0.95/0.5 GPF beats Aqua-Saver II 1.28/0.8)
• You want vacuum-assist trapway performance

Skip and choose Kohler Persuade Curv if:

• Designer styling + Kohler resale value is worth the $140-$200 premium
• Big-box availability matters

Skip and choose Eljer Patriot or Diplomat (single-flush) if:

• You don't qualify for utility rebates in your jurisdiction (no incremental benefit beyond water bill savings)
• You prefer a simpler trip-lever single-flush mechanism
• You want universal aftermarket parts service path (Aqua-Saver II cartridge is Eljer-proprietary)

Warranty

Eljer Aqua-Saver II warranty: Lifetime on porcelain, 5 years on tank trim including dual-flush cartridge, 1 year on accessories. Cartridge replacement after warranty expires is owner-paid ($45-$60 part + plumber labor).

Pricing reality (2026)

Aqua-Saver II 091-7110 (White): $240-$290 through Ferguson/Winsupply/Hajoca. Build.com: $259-$309. Home Depot: limited; special-order $279-$339. Biscuit variant +$30-$40. Replacement cartridge (091-7115): $45-$60 through any plumbing supply house, NOT available through big-box retail.