Thetford Porta Potti 335 (92828)
Published · Researched 2026-09-21
2026 lineup note: Current. The Porta Potti 335 is Thetford's compact model — the small-footprint member of the modern Porta Potti line (below the 345 and 365), with a 10 L fresh-water tank, 10 L waste-holding tank, piston-pump flush, and a waste-tank level indicator. Marketed heavily toward boats (hold-down kit included) but widely used in vans and camp. No known recalls.
Version lineage (2023–2026)
- Pre-2023 (legacy Cube era): Thetford's portable toilets ran under the Porta Potti Cube (145/165) and Excellence lines with the older styling.
- 2023–2024 (current generation): the refreshed 335 (model 92828) with modernized design, improved valve handle, improved waste-tank carry handle, integrated lid lock, and hold-down kit. It replaces the older 92865 variant.
- 2023–2026: 335 continues unchanged as the compact option alongside the 345 (mid) and 365 (full-size). No successor announced as of Sept 2026.
Overview
The Porta Potti 335 is a self-contained chemical (cassette-style) portable toilet: a 10 L fresh-water top tank with piston-pump flush feeds a 10 L waste-holding tank with a sealed valve blade, level indicator, and swiveling pour-out spout. At 313 mm tall with a 308 mm seat height, it's the low, compact option — sized for boats, truck sleepers, and small vans where headroom is tight. The hold-down kit is included in the box (bolts the base to a floor; one action releases the toilet). Thetford is the world's leading portable-toilet brand — this is the default, not the experiment.
Key Specs
| Spec | Value |
|---|---|
| Type | Self-contained chemical portable toilet, piston-pump flush |
| Fresh-water tank | 10 L (2.6 gal) |
| Waste-holding tank | 10 L (2.6 gal; one source cites 11 L) |
| Net weight | 3.3 kg = 3,300 g = 7 lb 4 oz (116 oz) |
| Dimensions (H×W×D) | 313 × 342 × 382 mm (12.3 × 13.5 × 15.0 in) |
| Seat height | 308 mm (12.1 in) |
| Max load | 120 kg (265 lb) |
| Flush system | Manual piston pump |
| Indicators | Waste-tank level indicator (fresh-tank indicator: no) |
| Extras | Integrated lid lock, swivel pour-out spout, hold-down kit included |
Pricing
- MSRP (Sept 2026, USD): ~$159.95 (observed US marine retailers, 2026).
- Street price (Sept 2026, USD): ~$124.95–151.99 (NVN Marine $124.95; Sportfish Outfitters $141.99; First Choice Marine $150.49). Re-verify live before publishing.
In the Box
Porta Potti 335 toilet, hold-down kit, documentation (quick guide, owner's manual). Chemicals and toilet tissue sold separately.
Warranty
3-year manufacturer's warranty (per EU/UK retailers; US warranty terms — re-verify with Thetford USA). Thetford handles portable-toilet warranty directly; several retailers note the product "may not be returned to the original point of purchase" and direct issues to the manufacturer.
Support & Parts
Thetford sells replacement seals, valve blades, pumps, and tank parts for the Porta Potti line, plus its own Aqua-Kem/Aqua-Rinse chemicals and Aqua-Soft tissue (the tissue matters — standard TP can clog the valve). Manuals and brochures are downloadable from Thetford.
Community Verdict
Porta Potti is the category — vanlife, overlanding, and boating communities treat Thetford as the default recommendation and everything else as the alternative. The 335 specifically gets picked for tight spaces: boats, truck sleepers, and small vans where the 365's height won't fit. The recurring community notes: the seat is low (308 mm — tall users complain), 10 L fills fast with two people (plan on frequent empties), and the piston pump is simple and field-serviceable. Use Thetford's own chemicals and rapid-dissolve tissue or expect odor and valve trouble. Qualitative pulse only — no fabricated scores.
Images
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All six visually verified 2026-09-21 as exact-product Thetford Porta Potti 335 (white/grey compact unit, piston pump, level indicator).
Research date: 2026-09-21. Specs from retailer spec tables (Homestead Caravans, Berger Camping, Amazon UK) and US marine retailers for pricing. Re-verify live: pricing, US warranty terms.
Long-term durability & warranty-claim reality (enrichment — Sept 2026)
The 335 is a simple machine and lasts: the failure points are the valve-blade seal and the piston pump, both replaceable with Thetford parts. The seal needs lubrication (Thetford seal lubricant, not petroleum products) or it dries, leaks odor, and sticks. Never use stiff brushes or homemade cleaners on the valve — Thetford's own warning, and the community confirms damaged seals are the #1 odor cause. The 3-year warranty is real but claims go to Thetford, not the retailer — keep your proof of purchase.
Version history — year by year (enrichment — Sept 2026)
- 2023: Current-generation 335 (92828) in market, replacing the 92865; refreshed design, improved valve and carry handles.
- 2024: Continued.
- 2025: Continued.
- 2026: Continued; no successor announced. Exact year the 92828 replaced 92865 is UNVERIFIED — circa 2022–2023.
Head-to-head vs closest rivals (enrichment — Sept 2026)
- vs Thetford Porta Potti 345 (
/library/gear/hygiene-sanitation/thetford-porta-potti-345/): the mid-size sibling — larger tanks, taller seat, more comfort, more money. Pick the 345 if you have the headroom; the 335 only wins on footprint and price. - vs Thetford Porta Potti 365 (
/library/gear/hygiene-sanitation/thetford-porta-potti-365/): the full-size sibling — electric flush option, biggest tanks. The 365 is the family/van choice; the 335 is the solo/boat choice. - vs Dometic 976 (
/library/gear/hygiene-sanitation/dometic-976-portable-toilet/): the true rival brand — similar compact class, similar price. Thetford wins on parts availability and brand ubiquity; Dometic wins on some users' preference for its flush mechanism. Both need the same chemical discipline.
Care & maintenance (enrichment — Sept 2026)
Use Thetford Aqua-Kem (waste tank) and Aqua-Rinse (flush tank) chemicals; use rapid-dissolve tissue (Aqua-Soft). Empty at dump stations or RV dump points — never in the wild. Lubricate the valve seal regularly with Thetford seal lubricant. Clean with Aqua-Clean, not bleach or stiff brushes. Store with the valve closed and a little rinse water in the bowl.
Buying traps (enrichment — Sept 2026)
- Seat height: 308 mm is low — try sitting on it (or a box that size) before buying if you're tall or have knee issues.
- 10 L fills fast: two people full-timing will empty this constantly — it's a weekend/boat toilet, not a full-timing toilet.
- Chemicals are mandatory: a chemical toilet without the right chemicals is an odor bomb. Budget Aqua-Kem and Aqua-Rinse.
- "Marine" markup: the 335 is sold through marine channels with a hold-down kit — the same toilet; don't pay extra for the word "marine" unless you need the kit.
- Retailer return limits: several US marine retailers state this item can't be returned to the point of purchase — defects go to Thetford. Buy from a seller you're comfortable with.
Community Verdict — additional voices (enrichment — Sept 2026)
The boater community is where the 335 earns its keep — it's the toilet that fits under a cuddy-cabin berth, and the hold-down kit means it stays put in chop. Overlanders pick it for the same reason in reverse: it fits in a footwell. The piston pump gets community respect for being fixable with a screwdriver and a parts diagram, versus electric-flush models that die on a dead battery. No fabricated scores.
Key Specs gap-fill (enrichment — Sept 2026)
Fresh tank 10 L (2.6 gal); waste tank 10 L (2.6 gal — one retailer cites 11 L). Net weight 3.3 kg = 3,300 g = 7 lb 4.4 oz (~116 oz). Dimensions 313 × 342 × 382 mm = 12.3 × 13.5 × 15.0 in (H×W×D). Seat height 308 mm = 12.1 in. Max load 120 kg = 265 lb. Piston-pump flush; waste-tank level indicator; integrated lid lock; hold-down kit included. Pricing: MSRP ~$159.95; street ~$124.95–151.99 — re-verify live.