Re: Required Water Pressure for a Toilet?
Posted by More on June 29, 19100 at 02:37:46:
In response to Re: Required Water Pressure for a Toilet?
: We're looking to use an outdoor elevated water tank to fill an indoor toilet at a cabin. However the water does not flow into the holding tank on the back of the toilet even though the outdoor reservoir is at a higher elevation. How much pressure (in psi.) does it take to force the water through the apparatus in the back of the toilet to fill the tank? Is there a particular type of system (valve and float) that operates at a lower pressure than most? Thanks

The reservoir tank needs to be at a height of five feet higher than the toilet tank, when the reservoir tank is five gallons, and the elevation is at sea level. When the cabin is at 5000 feet elevation, the reservoir needs to be larger in gallonage capacity, or five gallons but six feet higher than the tank. Water weighs 8.5 pounds per gallon and the barometric pressure at that level is about 28 pounds. The 40 pounds of water is plenty to fill the tank using gravity head pressure. Check your plumbing. Is there rust in the reservoir getting stuck in the fill valves? Turn the water off at the supply and disconnect the ballcock. Open the supply a little bit. Does the reservior fill the tank now? Rinse out the ballcock. It only has a 1/16 inch hole in it and it plugs with sand and rust readily. Check it by blowing into the filltube where the supply connects with the ballcock shut, and then operate the ballcock. Does air move through well? Reconnect the ballcock to the supply tube and turn the water on without the small fill tube connected and operate the ballcock. Does it work now?

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