
Showers on boats are used for rinsing off after swimming or doing maintenance on the boat. They are not designed for washing down the boat. Boat showers can be mounted in the cockpit or on the swim platform. The water used in boat showers comes from a freshwater storage tank, which is filled with potable water. Used water from boat showers is routed through a grey water system, which discharges it into the water.
| Characteristics | Values |
|---|---|
| Purpose | To cool the top bearing cap of Mercruiser Sterndrives |
| Water source | Freshwater storage tank |
| Water discharge | Water is routed through a grey water system, out into the water |
| Water conservation | Solar showers and shower shutoff plugs can be used to conserve water |
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What You'll Learn
- Boat showers can be used to cool the top bearing cap of Mercruiser Sterndrives
- Showers on boats are not designed for washing down the boat
- Boat showers use a pump to draw from a freshwater storage tank
- Used water from boat showers can be routed through a grey water system
- To conserve water, use a shower shutoff plug

Boat showers can be used to cool the top bearing cap of Mercruiser Sterndrives
Boat showers are used to cool the top bearing cap of Mercruiser Sterndrives. They spray a continuous stream of water onto the bearing cap, which helps to keep the outdrives cool. This extra cooling can double the bearing life and service life of the drive oil, and it also prevents oil foaming, which is the prime cause of oil breakdown that leads to drive failure.
Boat showers work by picking up water from the drive cavitation plate when the boat is underway. The water is then passed through a tube or hose and discharged onto the top of the drive bearing cap.
Boat showers are not the same as transom showers, which are mounted in the cockpit or on the swim platform and are used to rinse off after swimming or working on the boat.
Like other boat showers and sinks, the water used in Mercruiser Sterndrives comes from the boat's freshwater storage tank. This water is pumped from the tank and discharged onto the bearing cap. The used water is then routed through a grey water system, where it goes through a P-trap and is discharged back into the water outside the boat.
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Showers on boats are not designed for washing down the boat
Boat showers are part of a plumbing system that safely discharges the water you use. They are usually mounted in the cockpit or on the swim platform. The water is drawn from a freshwater storage tank, which is filled with potable water.
The used water from the shower then goes through a grey water system. It is routed through a P-trap and then discharged outside, usually above the waterline. To avoid contaminating the environment, you must use biodegradable soap.
One way to conserve water is to use a shower shutoff plug, which can be installed right at the shower.
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Boat showers use a pump to draw from a freshwater storage tank
To conserve water, it is recommended to use a shower shutoff plug, which can be installed right at the shower. This is especially useful for inside showers. Solar showers are another option for conserving water.
Boat showers are not designed for washing down the boat. They are typically mounted in the cockpit or on the swim platform and are used for rinsing off after a swim or after getting hot from boat maintenance.
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Used water from boat showers can be routed through a grey water system
Water from the shower drains to either the bilge or a dedicated shower sump, from where it is pumped outside, usually above the waterline. This is in contrast to "black water" from the toilet, which is stored in a holding tank and emptied at a dock with a pumping station.
Boat showers are typically mounted in the cockpit or on the swim platform and are used for rinsing off after swimming or maintenance work on the boat. They are not designed for washing down the boat itself. To conserve water, some boats use a shower shutoff plug or a solar shower.
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To conserve water, use a shower shutoff plug
Showers on boats are usually mounted in the cockpit or on the swim platform. They are used to rinse off after swimming or after getting hot from boat maintenance. Showers on boats use a pump to draw from a freshwater storage tank. To conserve water, use a shower shutoff plug. This is a simple device that can be used to stop the flow of water from the shower. It is inserted into the showerhead and can be turned on and off as needed. This helps to reduce water usage and is especially useful for boats with limited water storage capacity.
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Frequently asked questions
Boat showers are used for rinsing off after swimming or doing maintenance on the boat. They are not designed for washing down the boat.
Boats have a freshwater storage tank filled with potable water. The shower and sink use a pump to draw from this tank as their source. Used water from sinks and showers can be routed through a grey water system. In this system, used water goes through a P-trap and then out into the water.
A drive shower sprays a continuous cooling stream of water onto the top bearing cap of Mercruiser Sterndrives. This extra cooling can double the bearing life and service life of your drive oil and prevents oil foaming, the prime cause of oil breakdown that leads to drive failure.











































