All Prices Include VAT
KERNOWRAT
Practical Solutions
VAT No. -
Nature’s Head is an innovative composting
toilet designed by sailors with the constraints
of boats in mind. Therefore this compact head
is ideal for boats, caravans and motorhomes,
holiday homes, workshops etc.
Wherever plumbing and space saving is an
issue Nature’s Head is an environmentally
friendly, affordable, space saving, self
contained option and a welcome alternative
to chemical toilets & ‘porta potties’.
Nature’s Head separates urine from solid
waste. Because of this, the unit has an
extraordinary holding capacity – one fill of
compost could last an entire boating season
for weekend sailors or one month for a
cruising or live-aboard couple.
toilet designed by sailors with the constraints
of boats in mind. Therefore this compact head
is ideal for boats, caravans and motorhomes,
holiday homes, workshops etc.
Wherever plumbing and space saving is an
issue Nature’s Head is an environmentally
friendly, affordable, space saving, self
contained option and a welcome alternative
to chemical toilets & ‘porta potties’.
Nature’s Head separates urine from solid
waste. Because of this, the unit has an
extraordinary holding capacity – one fill of
compost could last an entire boating season
for weekend sailors or one month for a
cruising or live-
A Cleaner Greener Option
For Human Waste Disposal
For Human Waste Disposal
* Full-size moulded seat
* Urine-separating
* Self-contained
* User-friendly
* Very Compact
* Metal components are stainless steel or brass
* Grey Granite-Coloured Plastic
* High holding capacity
* Odour-free
* Waterless
* Easy to install
Width: 33 cm at the base
Height: 51 cm
Depth: 45 cm, but allow 51 cm for the installation
Weight: approximately 11.5 kg
Compost required for bowl: 6-7 litres
Height: 51 cm
Depth: 45 cm, but allow 51 cm for the installation
Weight: approximately 11.5 kg
Compost required for bowl: 6-
£611.00 Including VAT and DELIVERY
Insured Via 24 Hour Courier -
Mainland England, Wales & Southern Scotland
Please ask for a quote for any other destination
Made In The USA
Power connection
A simple 12 Volt fan (similar to those found in computers) drawing less than 1 amp is the only power requirement for the unit.
The power hook-up − a single pin attachment with a wire length of 6 feet (1.80 m) − is also included.
As with all electrical connections, ensure that your head is on a fused circuit.
The fuse should be no less than 2 amps and no more than 5 amps.
The power hook-
The fuse should be no less than 2 amps and no more than 5 amps.
Powerless installation
The unit can also be installed in a completely powerless installation by using a solar vent on the cabin top and attaching the vent
hose underneath. Make sure to choose a solar vent with battery back-up so that the head will vent continuously.
The fan can be left in the unit if you decide on this option.
Venting
The unit must be vented outside to allow for proper growth of the beneficial bacteria needed in the composting process and to keep
the head smelling fresh. The vent will also provide the additional benefit of continuous ventilation of fresh air.
That means that installing a Nature’s Head should improve air quality and reduce humidity throughout the boat / motorhome etc.
Solar vents, mushroom vents or clamshell vents (which are not provided with your Nature’s Head) are most commonly used for
venting to the exterior. You will need to choose a vent that best meets your requirements.
As outlined below, use of a solar vent with a battery back-up so that the head will vent continuously, represents an alternative
power-free installation.
Provided with your Nature’s Head are hose adaptors that connect directly to the head and the outside vent.
A venting hose, also included, then attaches directly to these adapters.
Clamping is not necessary on the connection with the Head and not normally necessary on the exterior connector.
On an overhead connection, you may find it necessary to clamp the vent end, depending on the amount of support you provide for
the vent hose. Provided the hose is supported adequately, you will probably not need a clamp.
The vent hose must go on the housing that has the fan inside it. The unit is designed to pull fresh air through the head and ventilate
it outside. If you disassemble the fan housing, always remember to check that the fan is blowing out of the vent before attaching
the vent hose.
The fan/filter flange is interchangeable with the filter-only flange should you want to change the side it’s located on for easier
installation. Simply swap sides with the components and their respective housings.
Finally, the agitator handle must be attached to the pre-threaded agitator. If you’d like to move the handle to the opposite site of
the base, the agitator must be removed manually, reversed and replaced. The extended nut must be re-attached before connecting
the handle. It is recommended that you use a spanner to hold the extended nut while you tighten the nut to the agitator and then
the handle to the nut. Both should be reasonably tight so that they don’t become loose when the unit is in service.
the head smelling fresh. The vent will also provide the additional benefit of continuous ventilation of fresh air.
That means that installing a Nature’s Head should improve air quality and reduce humidity throughout the boat / motorhome etc.
Solar vents, mushroom vents or clamshell vents (which are not provided with your Nature’s Head) are most commonly used for
venting to the exterior. You will need to choose a vent that best meets your requirements.
As outlined below, use of a solar vent with a battery back-
A venting hose, also included, then attaches directly to these adapters.
Clamping is not necessary on the connection with the Head and not normally necessary on the exterior connector.
On an overhead connection, you may find it necessary to clamp the vent end, depending on the amount of support you provide for
the vent hose. Provided the hose is supported adequately, you will probably not need a clamp.
The vent hose must go on the housing that has the fan inside it. The unit is designed to pull fresh air through the head and ventilate
it outside. If you disassemble the fan housing, always remember to check that the fan is blowing out of the vent before attaching
the vent hose.
The fan/filter flange is interchangeable with the filter-
Finally, the agitator handle must be attached to the pre-
the handle to the nut. Both should be reasonably tight so that they don’t become loose when the unit is in service.
Nature’s Head Operation Guide
Preparing the head for use
Before using your new Nature’s Head toilet, place 6-7 litres of pre-moistened compost into the base of the unit. The compost
should be slightly moist and crumbly, never wet or soupy. If your compost is dry, add a little water until it reaches the right
consistency.
consistency.
General notes on usage
The primary concept of the composting toilet is the separation of liquid and solid wastes.
Sitting vs. standing
Seated use is recommended as the liquids and solids will be most efficiently directed along the correct paths from this position.
With seated use, the trapdoor can be left in the open or closed position.
Male stand-up usage is acceptable but comes with the risk of ‘splatter’. In the event of stand-up usage, the trapdoor must
remain closed to prevent the mingling of liquid and solid wastes.
With seated use, the trapdoor can be left in the open or closed position.
Male stand-
Solids
When depositing solids, a coffee filter may be placed into the bowl. This facilitates the movement of the waste into the base
of the unit and keeps the bowl clean. Additionally, paper content from the coffee filters is good for the compost mixture.
Many people, however, choose to use the unit with the trapdoor open, allowing solids to be deposited directly into the compost.
After solid waste addition, the compost must be agitated 2-3 revolutions to mix the waste into the compost.
Contents of the solid waste container must be kept moist, not wet, and remain separated from the liquid waste. The composted
matter will have a slight soil-like odour and its visual appearance will be very similar to that of the original compost.
of the unit and keeps the bowl clean. Additionally, paper content from the coffee filters is good for the compost mixture.
Many people, however, choose to use the unit with the trapdoor open, allowing solids to be deposited directly into the compost.
After solid waste addition, the compost must be agitated 2-
matter will have a slight soil-
Toilet paper
How you use it is a matter of personal preference, but the more paper is placed in the compost, the sooner the tank will fill up.
Also, paper products do not break down as fast as solid wastes so typically you will see them long after the solid matter has
broken down.
Also, paper products do not break down as fast as solid wastes so typically you will see them long after the solid matter has
broken down.
Odours
If used properly, Nature’s Head is virtually odour-free. If unpleasant smells are emanating from the solid waste compartment,
the most likely culprit is excessive moisture content. Check compost consistency and add extra compost as necessary.
Some people put a little brown sugar in the liquid tank to reduce the odour of the urine, a few drops of tea tree oil will do
the same thing.
Regular emptying, however, is the surest method to avoid odours and eliminates the need for any additives.
Emptying the tanks
Liquids
The liquid waste vessel holds a maximum of about 8 litres of urine. Because of the container’s opaque material, the liquid level
can easily be seen.
To empty the container:
can easily be seen.
To empty the container:
Release the latches securing the bowl to the base that are located at both front sides of the unit.
Raise the bowl to an angle of about 45 degrees, put on the cap and remove the bottle.
Dispose of the contents in an appropriate manner, e.g. in a public toilet.
Should overflow of the liquid waste container occur, the liquid will remain confined to the container base as long as the overflow
is not excessive.
is not excessive.
Solids
Solid wastes should be removed from the storage base when the tank reaches approximately three quarters full.
As with any compost, the longer you let it sit before emptying, the more the solids will have decomposed and the more
pleasant this job will be.
With the bottle assembly removed, lift the seat a little and slide it to the left to disengage the slip hinge.
You may need to unhook your vent hose and power supply if you need to set the bowl off to the side.
Remove the knobs from the mounting brackets at each side of the base and invert to empty.
Most tall kitchen bags will fit over the base to allow easy removal.
It is unnecessary to clean the interior of the solid waste container as composting will continue from the residual matter
clinging to the sides. Simply add fresh compost, as prior to initial use.
The recommended procedure for disposing of the solid waste from the tank is to allow it to fully decompose, for example in
a composting bin, before bagging it up and binning it.
If stored for a period of at least three months, the contents may safely be used as fertilizer.
As with any compost, the longer you let it sit before emptying, the more the solids will have decomposed and the more
pleasant this job will be.
With the bottle assembly removed, lift the seat a little and slide it to the left to disengage the slip hinge.
You may need to unhook your vent hose and power supply if you need to set the bowl off to the side.
Remove the knobs from the mounting brackets at each side of the base and invert to empty.
Most tall kitchen bags will fit over the base to allow easy removal.
It is unnecessary to clean the interior of the solid waste container as composting will continue from the residual matter
clinging to the sides. Simply add fresh compost, as prior to initial use.
The recommended procedure for disposing of the solid waste from the tank is to allow it to fully decompose, for example in
a composting bin, before bagging it up and binning it.
If stored for a period of at least three months, the contents may safely be used as fertilizer.
Cleaning and maintenance
A quick spray of water from a squirt bottle is all that is needed to keep your Nature’s Head fresh between uses.
If necessary, a moistened paper towel is excellent for cleaning the interior of the head. For more intensive cleaning, a paper
towel moistened with a 1:1 solution of vinegar and water can be used.
Bleach, ammonia and other commercial cleaning products should never be added to your composting toilet as they will interfere
with the composting process and may lead to unpleasant smells.
Maintenance requirements for the head are minimal. All metal parts – bolts, hinges, latches, knobs, agitator and trapdoor
components are either stainless steel or brass.
The filters on each side of the base should be removed and cleaned annually or when emptying the solid waste. Each filter
is secured to the housing with two Phillips-head bolts. Remove bolts, clean filters and refasten.
Q & A
Does it smell bad?
No, because you never mix the liquid wastes with the solid wastes it does not have the odours associated with sewage or
holding tank systems.
When working properly it will have a slight earthy smell.
When should I empty it?
It is best to allow the solids to decompose before emptying your toilet. The longer you wait before emptying your toilet, the
nicer the job will be.
Many boaters will leave the solid wastes in the toilet over the winter and empty it in the spring. That may not be possible for
some applications, but you will find that even in as little as one week much of the solid wastes have begun to decompose,
and just the paper products are visible.
It is best if you do not leave the liquid wastes in the tank for extended periods.
While everyone is different, some urine will smell bad if allowed to sit for extended periods. A few drops of Tea Tree Oil will
help prevent smell.
Where do I empty it?
If the solids haven’t had time to decompose fully, the proper place to empty the solids tank is in a composting bin.
If the solids are fully decomposed, they can be bagged up and disposed of in a normal rubbish bin or, after about 3 to 6 months,
used as fertilizer. Boaters may empty theirs overboard if they are the proper distance offshore. The liquid tank can be emptied
into a toilet or overboard if offshore.
How does it separate the liquids and the solids?
The toilet has a gate or door that when closed directs the liquid waste into the front tank. When the door is open the solids
pass through to the lower main tank.
When seated on the toilet, the liquids naturally are aimed towards the front collection area and the solids are directed straight
down into the main tank.
Why is the toilet seat moulded into the unit?
Because Nature’s Head is designed for the “mobile” market, it has the toilet seat moulded into the unit for added safety so
that the seat can’t break off in rough conditions.
Do I need to run the fan all of the time?
While the unit can be operated without the fan, it is best if it runs all of the time. This will prevent any musty odours and the
fan helps with the composting process.
If battery drain is a concern then you might consider attaching the unit to a solar vent instead of using the built in fan, or using
a small solar panel to offset the battery drain.
To find out where waste is disposed of near you www.environment-agency.gov.uk or visit www.recyclenow.com to search for the
closest recycling facilities by postcode.
Facts and figures from beach clean ups and surveys can be found at www.adoptabeach.org.uk
Download a list of hazardous waste at www.thegreenblue.org.uk.
Clubs and marinas should download The RYA/BMF’s Guide to Port Waste.
If necessary, a moistened paper towel is excellent for cleaning the interior of the head. For more intensive cleaning, a paper
towel moistened with a 1:1 solution of vinegar and water can be used.
Bleach, ammonia and other commercial cleaning products should never be added to your composting toilet as they will interfere
with the composting process and may lead to unpleasant smells.
Maintenance requirements for the head are minimal. All metal parts – bolts, hinges, latches, knobs, agitator and trapdoor
components are either stainless steel or brass.
The filters on each side of the base should be removed and cleaned annually or when emptying the solid waste. Each filter
is secured to the housing with two Phillips-
Q & A
Does it smell bad?
No, because you never mix the liquid wastes with the solid wastes it does not have the odours associated with sewage or
holding tank systems.
When working properly it will have a slight earthy smell.
When should I empty it?
It is best to allow the solids to decompose before emptying your toilet. The longer you wait before emptying your toilet, the
nicer the job will be.
Many boaters will leave the solid wastes in the toilet over the winter and empty it in the spring. That may not be possible for
some applications, but you will find that even in as little as one week much of the solid wastes have begun to decompose,
and just the paper products are visible.
It is best if you do not leave the liquid wastes in the tank for extended periods.
While everyone is different, some urine will smell bad if allowed to sit for extended periods. A few drops of Tea Tree Oil will
help prevent smell.
Where do I empty it?
If the solids haven’t had time to decompose fully, the proper place to empty the solids tank is in a composting bin.
If the solids are fully decomposed, they can be bagged up and disposed of in a normal rubbish bin or, after about 3 to 6 months,
used as fertilizer. Boaters may empty theirs overboard if they are the proper distance offshore. The liquid tank can be emptied
into a toilet or overboard if offshore.
How does it separate the liquids and the solids?
The toilet has a gate or door that when closed directs the liquid waste into the front tank. When the door is open the solids
pass through to the lower main tank.
When seated on the toilet, the liquids naturally are aimed towards the front collection area and the solids are directed straight
down into the main tank.
Why is the toilet seat moulded into the unit?
Because Nature’s Head is designed for the “mobile” market, it has the toilet seat moulded into the unit for added safety so
that the seat can’t break off in rough conditions.
Do I need to run the fan all of the time?
While the unit can be operated without the fan, it is best if it runs all of the time. This will prevent any musty odours and the
fan helps with the composting process.
If battery drain is a concern then you might consider attaching the unit to a solar vent instead of using the built in fan, or using
a small solar panel to offset the battery drain.
To find out where waste is disposed of near you www.environment-
closest recycling facilities by postcode.
Facts and figures from beach clean ups and surveys can be found at www.adoptabeach.org.uk
Download a list of hazardous waste at www.thegreenblue.org.uk.
Clubs and marinas should download The RYA/BMF’s Guide to Port Waste.
Did you know?
Untreated sewage discharged from boats can spread gastroenteritis, contaminate shell fish beds and deplete vital oxygen in the
water that fish and other aquatic life depend on.
Human waste contains phosphorous and nitrogen which are nutrients for plant growth, increasing levels of algae and reducing
water.
Chemicals such as chlorine, formaldehyde, ammonium and zinc compounds used to disinfect, breakdown and deodorise waste
are toxic to marine life.
Things we can do: -
In the open sea, well away from land, waste will be quickly diluted and dispersed by wave actions and currents.
Only empty holding tanks more than 3 miles offshore in areas of poor flushing such as estuaries, inlets and marinas, make use
of shore side facilities, holding tanks and pump out facilities or a portable toilet. Chemical toilets use toxic substances and
should only be emptied ashore into the regular sewage system.
Plan ahead as they can be difficult to carry and few pump out facilities will accept chemical toilet waste.
In marinas, use shore side facilities and brief your crew to do likewise.
When visiting new sites, give consideration to the environmental sensitivity of the area before using your sea toilet.
Boats manufactured outside the UK may not have the correct ISO fittings for UK pump out stations.
Useful information
The prevention of pollution by sewage from ships is regulated by Annex IV of MARPOL see www.imo.org/home.asp
The Green Blue has published a directory of pump-out facilities in the UK
The RYA Marina guide and most good pilot guides and almanacs have details on the location of sewage pump out facilities
www.rya.org.uk/marinas/
A map showing locations of Special Areas of Conservation can be found at www.ukmarinesacs.org.uk
The Green Blue has published a directory of pump-
The RYA Marina guide and most good pilot guides and almanacs have details on the location of sewage pump out facilities
www.rya.org.uk/marinas/
A map showing locations of Special Areas of Conservation can be found at www.ukmarinesacs.org.uk