Install the Biolet toilet

Check the temperature

The temperature must be at least 18°C to ensure it functions properly. The easiest thing to do is to fit a thermostatically controlled
radiator. If the toilet is not in use then the temperature need not be controlled, low temperatures will not damage the unit itself.


  • Air must escape via the pipe : In order to ensure adequate air supply, a vent (air opening) should be installed in the exterior wall. The exhaust air is evacuated through the toilet.
  • Access to air coming from inside: 25 m3 of air comes in the toilet room.  Make sure there is an opening, e.g. a free space of the toilet 
  • Avoid having an extra bathroom fan in the toilet room.  In a normal toilet, this is used to remove bad air.  As the air is already removed via the Biolet as it creates a back draught, which can lead to odours in the room.

How large is must the toilet room be ?

  • Biolet model 15, 25, 55 : 55 cm x 110 cm
  • Biolet model 65 : 65 cm x 135 cm
  • Separera 30 : 40 cm x 90 cm

Air Pipe inside and Outside difference

  • The air pipe evacuates the air.  All pipes going through the ceiling into cold spaces (e.g. the attic) must be insulated. This is to prevent draughts and condensation in the ventilation pipe. Insulation is essential, regardless of how much or how little the toilet is used. Do not use pipe bends over 45°. Do not use a rain cap on top of the ventilation pipe - the air must be allowed to flow out freely. Only the insect netting (part of standard delivery) should be on top of the pipe.

Possible installation Setups for Biolet models

Biolet Installation Scheme"

Installation instructions

1. Set the toilet in position against the wall. The floor must be even and insulated.
2. Measure and make a hole for the ventilation pipe in the ceiling, with 55 mm diameter. Install the ventilation pipe with the non-sleeved end down inside the rubber coupling on the toilet.
3. Measure and make a hole in the roof, with 55 mm diameter.
4. Push the pipe up through the hole. Seal it well using asphalt sealant between the pipe and the roof to prevent any leaks.
5. Insulate the pipe from the ceiling up to the top. All pipework in cold spaces must be insulated.
6. Cut the exterior pipe to fit the angle of the roof.
7. Place the roof flashing onto the exterior pipe. (Use soapy water to make it easier). If you have a tin roof, the best thing to do is to get a lead worker to create a junction between the roof and the exterior pipe.
8. Pass the exterior pipe over the ventilation pipe's insulation. Put on the reduction
9. Adjust the roof flashing and seal firmly with asphalt sealant between the roof flashing and the roof.
10.Fit the insect netting against the stop on the reducing coupling.