For a simple single-flush chair-height toilet, pick the Gerber Viper Force GRS48352 or the Maxwell Crest GRS48310; both list 1.28 gpf, a Fluidmaster 400A fill valve and a soft-close seat in the box. Pick the Maxwell Select GRD49210E for dual flush. All three are 12-inch rough-in and elongated; buy a supply line separately.
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This guide compares three current Gerber toilets using Gerber’s product pages.
Gerber toilets compared (Gerber product pages)
On a phone, swipe or scroll the table sideways to see every column.
| Toilet | Flush | Fill valve / control | In the box |
|---|---|---|---|
| Viper Force GRS48352 | Single, 1.28 gpf | Fluidmaster 400A; tank lever | Bowl, tank, hardware, wax ring, ReadySet soft-close seat |
| Maxwell Crest GRS48310 | Single, 1.28 gpf | Fluidmaster 400A; tank lever | Bowl, tank, hardware, wax ring, soft-close seat |
| Maxwell Select GRD49210E | Dual, 1.0 or 1.28 gpf (see note) | Pilot fill valve; top push button | Bowl, tank, hardware, wax ring, soft-close seat |
Gerber labels the Viper Force a retail and online exclusive, and all three pages list its ReadySet installation kit. None includes the water supply line, so buy one with the toilet. Gerber lists a limited lifetime warranty on the vitreous china and a 5-year warranty on parts for these models.
Gerber Viper Force GRS48352: single flush with floor-mark coverage
Choose the Gerber Viper Force for a straightforward 1.28 gpf chair-height toilet that comes with everything except the supply line. The GRS48352 page (maker page: www.gerber-us.com/x/products/us-GRS48352) lists a 12-inch rough-in, gravity-fed flush, elongated bowl, ErgoHeight seat height, Fluidmaster 400A fill valve, 3-inch Fluidmaster flush valve, glazed trapway, ReadySet soft-close seat and ReadySet installation kit with alignment guides, hand-tightened star bolts and snap-on bolt caps.
It also lists a bowl base designed to cover floor marks left by a previous toilet. The page lists ADA compliance and WaterSense certification.
On October 15, 2026, the standard new offer sold by Amazon.com showed stock with model GRS48352.
Check Gerber Viper Force GRS48352 elongated toilet on Amazon →
Gerber Maxwell Crest GRS48310: the same core in a different style
Choose the Gerber Maxwell Crest if you prefer its look; the working parts listed are close to the Viper Force. The GRS48310 page (maker page: www.gerber-us.com/x/products/us-GRS48310) lists a 12-inch rough-in, gravity-fed 1.28 gpf flush, elongated ErgoHeight bowl, Fluidmaster 400A fill valve, 3-inch Fluidmaster flush valve, glazed smooth trapway, soft-close seat, ReadySet installation kit, vitreous china and a chrome-plated metal tank lever. It lists ADA compliance.
Gerber also sells a round-bowl Maxwell Crest (GRS48320) if your bathroom is too tight for elongated; we link only the elongated model here.
On October 15, 2026, the standard new offer sold by Amazon.com showed limited stock with model GRS48310.
Check Gerber Maxwell Crest GRS48310 elongated toilet on Amazon →
Gerber Maxwell Select GRD49210E: dual flush
Choose the Gerber Maxwell Select if you want a dual-flush toilet. The GRD49210E page (maker page: www.gerber-us.com/x/products/us-GRD49210E) lists a small flush and a large flush with a chrome-plated top push button, a Pilot fill valve, 3-inch flush valve, fully glazed trapway, soft-close seat, ReadySet installation kit, stainless steel tank-to-bowl connections and an ADA-compliant ErgoHeight bowl.
Note a conflict on Gerber’s page: the title and feature list say 1.0 gpf for the small flush and 1.28 gpf for the large flush, while the overview field lists 1.1/1.28 gpf. We report the small flush as 1.0 or 1.1 gpf until Gerber resolves it. Our single vs dual flush guide explains the trade-offs.
Later on October 15, 2026, the elongated GRD49210E listing showed as currently unavailable on Amazon. The round-bowl version, the Maxwell Select GRD49220E (maker page: www.gerber-us.com/x/products/us-GRD49220E), which Gerber lists as a dual-flush 1.0/1.28 gpf, 12-inch rough-in round toilet, was in stock and sold by Amazon.com. Buy it only if a round bowl suits your room; see the bowl-shape check below.
Check the round Gerber Maxwell Select GRD49220E on Amazon →
Check the rough-in and bowl shape
All three are 12-inch rough-in toilets. Measure from the finished wall to the center of the closet bolts before you buy; our rough-in guide shows how. If you measure about 10 or 14 inches, these are not the right toilets.
All three linked models are elongated. Our round vs elongated guide explains how much more floor space an elongated bowl needs.
What ErgoHeight means
Gerber calls its chair-height bowls ErgoHeight and lists them as ADA-compliant designs that make it easier to sit and stand. ADA compliance for a whole restroom depends on more than the toilet, including grab bars and clearances, so treat the label as a property of the fixture, not the room.
Installing a Gerber toilet
Gerber’s ReadySet kit includes alignment guides for lowering the bowl onto the bolts, star bolts that can be hand-tightened and snap-on bolt caps. The box includes a wax ring but not the supply line; our toilet supply line guide covers lengths and connections.
Shut off the stop, flush and sponge out the old tank, then remove the old toilet and clean the flange. Our toilet replacement guide walks through the steps. After installing, check the base and tank-to-bowl connection for leaks after the first few flushes, and again the next day before you caulk or finish around the base.
Which Gerber fits your bathroom
Pick by three questions. First, the rough-in: all three linked models are 12-inch. Gerber also lists a Viper 1.28 gpf 14-inch rough-in model (GWS31524) on its site; we did not check an Amazon offer for it, so measure first and look it up on Gerber if you have a 14-inch rough-in.
Second, the space in front of the bowl: all three linked models are elongated. Gerber lists a round Maxwell Crest (GRS48320) and a Viper Force Compact elongated model (GRS48350); check their dimensions on Gerber’s pages before ordering.
Third, the flush: single flush on the Viper Force and Maxwell Crest, dual flush on the Maxwell Select. Then choose the style you like, since the listed working parts on the two single-flush models are close.
Fill valves and replacement parts
The Viper Force and Maxwell Crest list a Fluidmaster 400A fill valve and a 3-inch Fluidmaster flush valve. The Maxwell Select lists a Pilot fill valve. Note the model of each part from the installation documents and keep it with your records so the right replacement is easy to order later.
Parts and other brands
When a Gerber toilet needs parts, our Gerber fill valve and flapper guide covers common replacements. To compare other brands, see our American Standard toilet guide and Kohler toilet guide.
Frequently asked questions
Are Gerber toilets good?
Gerber lists vitreous china construction, 3-inch flush valves and a limited lifetime warranty on the china with a 5-year parts warranty on these models.
What rough-in are Gerber Viper Force and Maxwell toilets?
All three here are 12-inch rough-in.
Do Gerber toilets come with a seat?
Yes. These three list a soft-close seat, wax ring and installation hardware in the box. The supply line is not included.
Is the Gerber Maxwell Select dual flush?
Yes. Gerber lists a small and large flush with a top push button; its page lists the small flush as 1.0 gpf in one place and 1.1 in another.
What fill valve do Gerber toilets use?
The Viper Force and Maxwell Crest list a Fluidmaster 400A; the Maxwell Select lists a Pilot fill valve.
How we chose
This document-based guide makes no hands-on testing claim. We read Gerber’s product pages for the Viper Force GRS48352, Maxwell Crest GRS48310 and Maxwell Select GRD49210E. We did not retrieve their spec PDFs, and we do not repeat Gerber’s marketing performance claims. On October 15, 2026, the Viper Force and Maxwell Crest offers were sold by Amazon.com and showed stock or limited stock; the elongated Maxwell Select went unavailable that evening, so we link its round-bowl version. Read our selection method and about Plumbing Picks.
Primary sources
- Gerber Viper Force GRS48352 product page (maker page: www.gerber-us.com/x/products/us-GRS48352): 12 in. rough-in, 1.28 gpf, Fluidmaster 400A, 3 in. flush valve, ReadySet, floor-mark base, box contents, ADA, WaterSense, warranty.
- Gerber Maxwell Crest GRS48310 product page (maker page: www.gerber-us.com/x/products/us-GRS48310): 12 in. rough-in, 1.28 gpf, Fluidmaster 400A, box contents, ADA, warranty.
- Gerber Maxwell Select GRD49210E product page (maker page: www.gerber-us.com/x/products/us-GRD49210E): dual flush (1.0 vs 1.1/1.28 conflict), Pilot fill valve, push button, stainless tank-to-bowl connections, warranty.
- Gerber Maxwell Select GRD49220E product page (maker page: www.gerber-us.com/x/products/us-GRD49220E): round bowl, dual flush 1.0/1.28 gpf, 12 in. rough-in.