On average across all rv classes and travel trailer types your gray water tank will have capacity for about 50 gallons with class a and fifth wheel trailers at the higher end of the scale and class b at the lowest end of the scale.
Rv gray water tank size.
The size and sleeping capacity of your rv will often also affect the size of your gray water tank.
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Larger rvs will obviously have larger holding tanks generally speaking.
For instance even a small casita travel trailer may have a black water tank of 15 or so gallons and a gray water tank of 32 gallons.
Class c rv is normally equipped with a fresh water tank of size 35 55 gallons on an average.
If your rv does not have a gray tank all dirty water is dispensed into.
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The grey tank holds the dirty water from your rv shower and the kitchen sink.
This is the one that tends to scare new rvers.
The average tank sizes for a sprinter rv are about 30 gallons for freshwater and grey water and 25 gallons for black water though a few class b sprinter rvs have black water tanks as small as 10 gallons.
The good news is your typical rv holding tank size is actually pretty reasonable.
Ideally you should keep the valve closed and allow the tank to fill up before dumping it.
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On an average a class a rv is normally equipped with a fresh water tank of size 70 100 gallons.
Just as with your black tanks you want to make sure you regularly empty and drain your rv s grey water tank though it s a good idea to drain it after your black tank all that relatively clean soapy water can flush your sewer hose of the truly icky stuff.
If you re someone who likes to camp for long periods of time in remote or desert public lands you ll need to figure out how to dispose of your grey water or access a dumping spot.
Some used campers and vintage rvs may not have this tank.
A week of boondocking should be.
Depending on the size of your rv or camper your grey water tank will only hold a certain number of gallons of water.