To read more great articles
from our tech team about water
systems on your boat, and solutions to the things that can go
wrong, see this article online
11. Holding tank has
pumpout hose and
gravity discharge overboard where legal.
12. Water heater has anti-back-flow valve to prevent expanding
hot water from entering cold-water system. (This tank is shown
lying on its side, an installation
seen on some boats. Normally,
hot-water tanks are upright.)
13. Anti-siphon loops
14. Potable water tank
w/ fill and vent.
15. Potable water tank
has sediment filter prior
to pressure pump.
16. Accumulation tank
17. Solar shower bag
BLUE: potable water
BROWN: waste water
LT BROWN: gray water
RED: hot water
NOTE: Parts of this Illustration are out of scale for purposes of clarity. Also, engine
systems are not included.
18. Scuppers drain cockpit.
Some boats need scuppers
w/ hose to discharge.
19. Jerry jug
OF YOUR WATER
SYSTEMS BY TOM NEALE ILLUSTRATION BY DICK EVERITT
under-the-sink cartridge remove many impu-rities and greatly improve taste. A water
system UV light, such as those used in some
reverse-osmosis systems, can kill viruses.
AIR CONDITIONING & REFRIGERATION ( 3) Condensation drain trays
should be occasionally inspected to clear
any blockage in drain hoses, which should
preferably drain overboard rather than into
the bilge. If trays don’t drain fully, they’ll
develop a musty odor that will be circulated
by the air handler.
ICEMAKERS ( 4) should be left open
and off when not being used for a few days
or longer to avoid odor and mold. Often the
incoming water line is behind the unit in an
area warmed by the unit, which facilitates
stagnation and odor, particularly in the filter
that may be in that area. When in use, the
ice bin should be dumped at least every few
days to keep water flowing. Good ventila-
BILGE WATER ( 5) Oil-absorbent pads
in bilges under the engine and whenever
there’s oil-spill potential are critical. They
must not interfere with the operation of a
bilge-pump float switch. Always clean loose
fuel and oils out of the bilge with an oil-absorbent pad, and discard appropriately.
Proper bilge-pump installation is critical and