Mansfield Smart 360 Dual-Flush Two-Piece Elongated 1.28/0.8 GPF Toilet

The Mansfield Smart 360 positioning — USA-made dual-flush at mid-tier

The Mansfield Smart 360 (model 155) is Mansfield's dual-flush water-conservation flagship. At $230-$310, it positions between the value-tier Vortens Cancun ($179-$249) and Glacier Bay Power Flush ($149-$199) on the lower end, and Eljer Aqua-Saver II ($240-$320) and Niagara Stealth Dual-Flush ($290-$390) at mid-tier. The Smart 360's specific value: USA-made dual-flush with best-in-class warranty terms and SmoothSurface glaze.

The dual-flush 1.28/0.8 GPF effective average of 1.06 GPF qualifies for WaterSense Most Efficient certification — unlocking the highest tier of utility rebates ($100-$250 in CA, AZ, TX, NV).

What the Smart 360 delivers

• Larger button: 1.28 GPF full flush — MaP 800g (best in mid-tier dual-flush)
• Smaller button: 0.8 GPF half flush
• Effective 1.06 GPF — WaterSense Most Efficient certified
• Top-mount dual-flush button assembly
• Comfort Height 16.5" + elongated bowl
• Mansfield SmoothSurface glaze — improved hard-water resistance
• Universal Korky/Fluidmaster aftermarket parts for non-cartridge components
• Lifetime porcelain warranty + 5-year tank trim
• Made-in-USA

The Smart 360 variant matrix

Smart 360 vs dual-flush competition

What owners report

• USA-made + best warranty + SmoothSurface glaze is the value proposition — owners specifically mention "made in Ohio not Mexico" as a differentiator.
• MaP 800g full flush handles paper loads better than Vortens Cancun (750g) or Glacier Bay Power Flush (700g).
• Cartridge service life: 12-15 years. Replacement is Mansfield-specific ($45-$60 + plumber install ~$120).
• Utility rebate redemption works as advertised for WaterSense Most Efficient tier.
• Service life: 25-30 years porcelain.

The verdict

Buy Smart 360 if:

• You want USA-made dual-flush + best warranty terms in segment
• WaterSense Most Efficient rebate eligibility is the priority
• SmoothSurface glaze for hard-water resistance matters
• Lowes or plumbing supply house is your purchase channel

Skip and choose Eljer Aqua-Saver II if:

• $10-$20 savings matters (often available at supply houses)
• Velvet glaze + Eljer brand recognition preferred

Skip and choose Vortens Cancun if:

• $60-$80 savings matters more than warranty depth
• Home Depot Sun Belt availability

Skip and choose Glacier Bay Power Flush if:

• $80-$110 savings matters + bundled SoftClose seat
• Lowest absolute net price after rebate

Warranty

Mansfield Smart 360 warranty: Lifetime on porcelain (original purchaser), 5 years on tank trim including dual-flush cartridge, 1 year on accessories.

Pricing reality (2026)

Mansfield Smart 360 155 (White): $230-$290 at Lowes and plumbing supply houses. Build.com: $239-$309. Replacement cartridge (155-CR): $45-$60 through Mansfield supply channel.

Frequently Asked Questions

• Will this fit my bathroom? Standard 12-inch rough-in fits most US homes built after 1970. Measure from the finished wall (not stud) to the center of the closet flange before ordering. For unusual rough-ins (10" or 14") or non-standard floor depths, verify dimensions against the product spec sheet before ordering.
• How long does installation take? Typical installation runs 2-3 hours for an experienced installer. Add 30-60 minutes if the closet flange needs replacement or repair, and 1-2 hours if the existing supply line stop valve needs to be replaced.
• Is the toilet seat included? Some configurations include a soft-close seat; others sell it separately for $20-$60. Check the SKU listing before purchase to confirm.
• How much will this save vs. my existing toilet? At 1.0/1.6 dual-flush (avg ~1.28) GPF, this two-piece toilet uses meaningfully less water than older designs. Replacing a pre-1992 3.5 GPF toilet typically saves $130-$180 per year in water utility costs, depending on local water rates and household flush volume — payback on the toilet purchase price within 2-4 years is realistic for most households.
• What's the realistic service life? Expect 12-15 years for the vitreous china; 8-12 years for the smart electronics (heated seat, bidet wand, control board) under normal residential use. Internal flush components (fill valve, flush valve, flapper) typically need replacement around year 7-10 — these are universal hardware-store parts costing $15-$45 total.
• Can I install this myself? Smart toilet installation is technically DIY-feasible but typically VOIDS the electronics warranty. Use a licensed plumber and verify GFCI outlet installation meets current NEC bathroom electrical code.
• What's the return policy if it doesn't work for my space? Most retailers accept unused toilet returns within 30-90 days (Home Depot 90, Amazon 30, specialty plumbing 30). Installed toilets are NOT returnable — measure twice, install once.

Step-by-Step Installation Overview

1. Turn off the water supply at the toilet stop valve (the small valve behind/beside the toilet). Flush the tank to drain residual water, then sponge out any water remaining in the tank and bowl.
2. Disconnect the supply line from the bottom of the tank. Have a small bucket and towel ready for any drips.
3. Remove the old toilet: unscrew the two closet flange bolts at the base, rock the toilet gently side-to-side to break the wax ring seal, and lift it off the flange. Have a second person help with the lift — the bowl alone weighs 50-90 lbs.
4. Clean the closet flange thoroughly. Scrape off old wax residue with a putty knife. If the flange is cracked or below the finished floor surface, replace it before proceeding (flange replacement adds ~$25 in parts and 30-60 minutes of labor).
5. Install new closet flange bolts in the flange slots (most kits include these; verify before starting). Place the new wax ring on top of the flange (or on the bottom of the new bowl, depending on installer preference).
6. Set the new bowl over the flange, aligning the bolts through the bowl mounting holes. Press down firmly with even pressure to seat the wax ring. Don't twist or rock the bowl after seating — that breaks the seal.
7. Tighten the closet flange bolts alternately (a few turns on each side, then back to the other) until the bowl is firmly seated. Don't over-tighten — porcelain cracks from excessive bolt torque.
8. Place the tank-to-bowl gasket on the bowl. Set the tank on the bowl, aligning the mounting holes. Insert the tank bolts from inside the tank and tighten alternately until the tank is snug against the bowl (don't over-tighten).
9. Connect the supply line to the bottom of the tank. Turn on the water supply, let the tank fill, and test the flush. Check all connections for leaks.
10. Install the toilet seat (if not pre-installed) by inserting the seat bolts through the bowl mounting holes and tightening the nuts from underneath.
11. Final leak check: flush several times, run a tissue paper test around the base for any seepage, and verify the toilet sits firmly without rocking.

Tools you'll need: adjustable wrench, channel-lock pliers, putty knife, sponge, small bucket, towels, and a level. If you don't have these, expect to spend $40-$60 at a hardware store on a basic install kit.

10-Year Total Cost of Ownership Estimate

• Initial purchase + installation supplies: typical $15-$30 in wax ring, supply line, and flange bolts on top of the toilet price.
• Plumber labor (if not DIY): $150-$350 for standard floor-mount install, $250-$500 for smart toilet, $1,000-$2,000 for wall-hung.
• Replacement seat at year 6-8: $25-$50 for a Bemis or branded replacement.
• Replacement flush internals at year 7-10: $15-$45 total in parts (fill valve, flapper) — universal Fluidmaster/Korky parts at any hardware store.
• Water utility cost (1.28 GPF average, 5,000 flushes/year): $400-$600 over 10 years depending on local water rates.
• Annual savings vs. replacing a pre-1992 3.5 GPF toilet: $130-$180/year ≈ $1,300-$1,800 over 10 years — frequently exceeding the entire toilet purchase + install cost.

Warranty Registration and Care Best Practices

Register this two-piece toilet with Mansfield Plumbing within 30 days of purchase to ensure warranty coverage — most brands require online registration plus original receipt for any future warranty claim. Save the receipt as a PDF and email it to yourself for cloud backup; physical receipts fade and get lost. Photograph the model number sticker (typically inside the tank or under the tank lid for one-piece designs) as part of your warranty documentation.

Common warranty exclusions across all toilet brands:

• Impact damage from dropped tools or items falling on the bowl/tank lid
• Freeze damage in unheated vacation properties or unheated bathrooms in cold climates
• Installation damage from over-tightened bolts (cracks at the flange mount), uneven floors causing rocking, or missing wax ring seals
• Damage from in-tank cleaning tablets (these chemically degrade rubber flapper seals and stain the porcelain)
• Hard water staining (cosmetic, not structural)
• Cosmetic scratches from abrasive cleaning products (especially on matte finishes)

Routine cleaning best practices: Use standard porcelain bowl cleaners (Lysol, Clorox, Soft Scrub with Bleach) for the bowl interior. Microfiber + mild dish soap for the exterior, lid, and seat. Avoid steel wool, abrasive scrub pads, and powdered scrub cleaners (Comet, Ajax) that scratch the glaze over years of use. For hard water mineral deposits, apply CLR or Lime-Away with a 10-15 minute dwell time, scrub with a bowl brush, then flush — repeat for stubborn buildup. Wipe water spots on the rim and seat hinge promptly to prevent permanent mineral etching, especially on matte black or matte gray finishes where mineral staining shows visibly faster than on glossy white.

If a warranty claim becomes necessary, contact Mansfield Plumbing customer service with: photographs of the defect from multiple angles, the model and serial number, your purchase receipt, and the installation date. Expect 5-10 business days for initial review and 15-30 days for claim resolution if approved.