What makes Clesana C1 different
Clesana C1 is a fixed waterless toilet for mobile recreational vehicles. Instead of flushing waste into a cassette or black tank, it uses a high-barrier liner and an electrically controlled separation and welding process.
After use, the toilet seals the contents into an individual bag section. The sealed bag is collected in the lower compartment and can later be removed for disposal according to local rules.
For a camper owner, the biggest architectural difference is simple: the toilet does not need flush water, a black-water tank or sanitation chemicals for normal operation.
No water does not mean no infrastructure
C1 removes the plumbing normally associated with a toilet, but it introduces a different requirement: a substantial 12 V electrical connection and a supply of the correct Clesana liner.
The toilet will not perform its sealing cycle without electrical power. A waterless sanitation system is therefore not “infrastructure free”; it trades water and waste plumbing for electrical power and consumables.
How the sealing process works
After the user starts a cycle, the C1 moves the high-barrier liner, seals the used section and separates it from the fresh liner above. Clesana specifies approximately 1.7 ±0.17 Wh for the separation process and 0.55 ±0.06 Wh for the welding process.
Those are energy figures for individual operations. They should not be confused with the much higher instantaneous power needed while the mechanism and sealing system are active.
Maximum electrical demand is the important wiring number
The current official shop page and the 2024 installation manual both specify 11.8–15 V supply, 12 V nominal voltage, up to 22 A current and up to 265 W power.
That 22 A maximum matters when designing the cable and fuse. It is very different from the small energy used by one sealing cycle.
MHS explanation.A device can use little energy per toilet visit and still require a high-current circuit for a short time. Battery capacity and conductor sizing are therefore two separate questions.
Cable size is not arbitrary
The current installation manual specifies 10 mm² power cable for cable routes up to 8 m and 16 mm² from 8 m. It also supplies an Anderson SB50-style connection arrangement in the installation package.
These are installation-manual requirements, not universal cable advice for every other 12 V appliance. A retrofit should follow the exact C1 manual and applicable electrical rules.
Standby consumption
Standby power is published as 0.28 W. That is small, but the toilet can remain connected for long periods.
For normal travel this is a minor load compared with refrigeration or heating. During months of storage, however, every permanent load contributes to parasitic battery drain. The camper's storage/isolation procedure should account for it.
It needs its own liner
Clesana states that C1 uses its dedicated high-barrier liner system. The liner is a consumable and is necessary for normal operation.
This is an important ownership difference from a cassette toilet. Instead of carrying chemicals and periodically emptying a liquid tank, the owner must keep enough liner material available for the trip.
MHS explanation.Consumable availability becomes part of travel planning, especially outside regions where Clesana supplies are easy to buy.
Disposal depends on local rules
Clesana's operating information says sealed bags may be disposed of as residual household waste unless separate local regulations apply.
That final condition matters. Waste-disposal rules can differ between countries, municipalities, campsites and protected areas. MHS therefore does not describe sealed bags as universally legal household waste everywhere.
Before international travel, check the local rules that apply to human-waste disposal.
What IPX4 means in a wet bathroom
The product is rated IPX4, meaning protection against splashing water under the relevant test conditions.
IPX4 is not an immersion rating and does not mean that the toilet or its electrical connections can be treated as waterproof. Installation in a wet bath still requires the placement and sealing defined by Clesana.
Do not direct high-pressure water at the controls, electrical connections or open mechanism.
Two base arrangements
Clesana publishes the C1 with an L-adapter or a round base. Overall height is 515 mm and width is 363 mm. Published length is 516 mm with the L-adapter and 461 mm with the round base.
The seat height is 478 mm. Weight is 13.8 kg with the L-adapter and 13.1 kg with the round base.
These differences matter when replacing an existing cassette toilet: the round base and L-adapter solve different installation layouts.
Rotation and real installation clearance
The installation manual shows that the toilet can rotate and requires space for both its use position and stowed position. It also requires the lid to open fully without falling closed.
MHS explanation.Product dimensions alone are not enough. A cabinet, shower wall or door can make a technically fitting toilet impractical if the bowl cannot rotate or the lid cannot open.
A retrofit should be checked with the real bathroom geometry, not only a tape-measure comparison of width and length.
Load rating
The current Clesana shop lists up to 150 kg for normal seated use.
This is a user-load rating, not a structural approval for standing on the toilet, using it as a step or attaching additional furniture to it.
Maintenance is different from a cassette toilet
There is no black-water cassette to rinse and no flush-water circuit to winterize. That removes several routine maintenance jobs.
The trade-off is care of the liner path, welding mechanism, tray and electrical system. Sharp objects and inappropriate material can interfere with the liner or sealed bag.
Clesana's instructions should be followed for cleaning and replacement consumables.
What happens in freezing weather
Because C1 does not use flush water, the toilet itself does not require the same water-draining procedure as a cassette or gravity-flush toilet.
But the rest of the camper may still contain fresh-water, grey-water and shower plumbing that must be winterized. Installing C1 does not make the entire bathroom freeze-proof.
A real temperature-specification conflict
The current Clesana shop page lists a use temperature of 0–45°C. The current Version 4 installation manual dated 2024-12-18 lists 5–40°C.
MHS does not choose one value without an official clarification. No single verified operating-temperature range is therefore assigned in the claims table. Owners should use the latest documentation supplied with their unit and ask Clesana if operation near either boundary matters.
This is exactly the kind of conflict that should remain visible rather than being silently resolved by copying the more convenient number.
What to check when buying or retrofitting
Confirm that the product is Clesana C1, not the portable X1. Check whether the camper uses the round base or L-adapter and make sure the toilet can rotate and the lid can open in the actual bathroom.
Inspect the 12 V supply, cable route, fuse/protection and power connector. Run a test separation/welding cycle with the correct liner.
Also ask where sealed bags are stored between disposal opportunities. Odour control may be excellent at room temperature, but storage space and local disposal rules still matter in real travel.
Why the installation should be done properly
The Version 4 installation manual is explicitly intended for trained, authorised installers and warns about electrical, fire and mechanical risks. It also defines cable sizes based on cable length.
The combination of a 22 A maximum load, moving mechanism and wet-room environment is enough reason not to treat this as a simple furniture swap.
Why MHS links C1 only to one Tischer right now
Tischer lists Clesana C1 as an available option on several cabins, and on one model it is expressly unavailable. Availability does not prove installation.
In the current research data, Tischer Trail 250 is the model whose selected exact-component configuration explicitly includes Clesana C1. That model receives the verified-component link.
The other Tischer models stay unlinked until a selected configuration, order sheet or actual build proves C1 is fitted.
Key takeaway
Clesana C1 replaces water-based toilet plumbing with a 12 V sealing system and consumable high-barrier liner. It can simplify tanks and winterization, but it requires a properly sized electrical circuit, installation clearance, liner supply and attention to local disposal rules.
Sources
Source conflict intentionally preserved: current Clesana shop page states 0–45°C usage; Version 4 installation manual dated 2024-12-18 states 5–40°C. No verified temperature claim is published. Current shop also says C1 uses dedicated C1 liners, while an FAQ line inconsistently mentions X1 liners; the product-specific compatibility question says X1/other liners are not intended for C1, so no cross-model liner compatibility is claimed.