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Can propane liquify inside the tank during temperature changes and therefore have proplems dispensing

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Propane is liquid in your tank. The vapor pressure will depend on the temperature as you can see by the following chart. For an example at 0F the vapor pressure in the tank would be 24.5 psig. and at 90F it would be 150psig. This is why you draw vapor from the top of the tank and then go immediately go through a high pressure regulator. Then usually at the appliance there is also a regulator (sometimes incorporated in the safety valve) You are burning propane as a vapor not a liquid. Remember for safety that propane vapor is heavier than air and sinks to the floor, so one must be careful for proper ventilation.
Temperature vs Vapor Pressure
(oF) (oC) (psig) (bar)
-44 1) -42.2 0 0
-30 -34.4 6.8 0.5
-20 -28.9 11.5 0.8
-10 -23.3 17.5 1.2
0 - 17.8 24.5 1.7
10 -12.2 34 2.3
20 -6.7 42 2.9
30 -1.1 53 3.7
40 4.4 65 4.5
50 10.0 78 5.4
60 15.6 93 6.4
70 21.1 110 7.6
80 26.7 128 8.8
90 32.2 150 10.3
100 37.8 177 12.2
110 43.3 204 14.1

Posted on Nov 08, 2010

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Posted on Jan 02, 2017

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I'm temporarily staying in our RV while our house is re-furbished. The water heater is only working intermittently. Can anybody help me?


RV water heaters are mounted against an outside wall. Go outside and look for a removable cover that has a mesh vent installed.
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If the water heater is propane your propane tank may be low of fuel. Also very cold weather may not let the propane produce adequate vapor to fuel the water heater. A low level of propane can make this problem worse.

If the water heater is electric, you may have too large a wattage draw from other appliances, when the water heater is trying to heat. Turn off items such as hair blowers, AC, and Microwave when the water heater is on. If a generator is providing the electricity it may not have enough output. If shore power is providing the electricity you need at least 30 AMPs.

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How to Change the Gas Valve and Thermostat on a Hot Water Heater


<p>If you are having<b> trouble with the temperatures</b> of your <b>gas hot water heater</b> fluctuating too much, or after <b>changing the thermocouple</b> of your gas <b>hot water heater</b> then you may need to change the complete <b>gas valve and thermostat assembly</b>. Also if you have changed the <b>thermocouple</b> and the pilot still will not stay lit, then the gas valve could be bad or the <b>ECO (Emergency Cutout)</b> may have activated and is open. This is a onetime device and cannot be replaced.<br /> <p><br /> <p>These instructions are for the older style <b>gas valve and thermostat combination</b>. These commonly have a large red knob that adjusts the temperature of the water. Also note that the burner tube nut for <b>natural gas</b> is right hand thread, but if you have <b>LP or propane gas</b> the burner tube nut is left hand thread.<br /> <p><br /> <p>The newer <b>gas valve thermostat combinations</b> that have come out recently are similar, but they have a well in the tank that the sensor slides into. The assembly is held fast with a set screw. With this type of <b>gas valve and thermostat unit </b>the tank does not need to be drained, but most of the rest of the change out is similar.<br /><br />To change a <b>gas hot water heater thermostat</b> you will need to first buy a new gas valve for your <b>hot water heater</b>. The <b>gas valve</b> and the <b>thermostat</b> are integrated into one unit.<br /><br />To <b>replace the thermostat on a gas hot water heater</b> you must follow these procedures....<br /><br />1. Turn off the incoming water and<b> drain the hot water heater</b>.<br /><br />2. Remove the <b>pilot tube</b>, the <b>burner gas tube</b> and the thermocouple from the gas valve. Turn off the <b>gas line</b> and remove from the gas valve.<br /><br />3. Get a <b>pump pliers</b> or a<b> wrench</b> in behind the gas valve and turn the whole assembly CCW to remove it from the tank.<br /><br />4. After applying pipe dope or tape to the new gas valve threads, turn the new gas valve into the tank by turning in a CW direction. Be careful not to damage the small wires to the <b>ECO</b>. They are the little red wires on the back. If you break them the assembly is irreparably damaged.<br /><br />5. Reinstall the gas line, thermocouple, burner tube, and the pilot tube to the gas valve.<br /><br />6. Fill tank with water. Make sure to open a <b>hot water faucet</b> and <b>purge all air from the tank.<br /><br /></b>7. <b>Check for leaks</b> where the gas line hooks up with soapy water.<br /><br />8. Relight pilot light and check operation.<br /><br />9. Set the new temperature setting to a medium setting and then adjust the temperature to your liking from there and adequate time for heating completely<br /> <p>

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Superflue. Why doesn't it stay lit?


If this is in a RV there is a propane monitoring valve. It will close and cut of the propane if it is not being used for a period of time or if there is a leak. The valve is mounted between the propane tank and the first appliance, usually inside the RV.

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Check in coming water flow . Check water flow at heater maybe blocked inside reduced flow .

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Last year we had all the siding on our tv, trailer, replaced due to hail damage. When we finally got our trailer back from the rv repair shop we have had nothing but problems with our Atwood hot water tank...


Immediate danger!
You have a gas leak.
Propane is heavier than air and will settle on the floor.
The floor can be covered and ignite and you will not smell it while standing or sitting or laying in bed.
Absolutely open the door and leave trailer. Turn off the gas to the heater if the shut-off is outside.
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DSi light coming on is to alert you that the water heater didn't light on propane for one reason or another. Sometimes people just forgot to turn propane on or are out of propane. What happens when you shut it off and turn it back on? (listening and watching from outside with cover open) DO you see or hear sparking?

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My refilled 60 # propane tank leaked and then stopped flowing.


Rick, if the tank is normally plumbed for a horizontal position, and you have it standing vertically, then you are feeding liquid propane to your pilot light, hence the frosted hose etc., and a tendency for the pilot light to go out as it has too rich of a fuel to burn. There should be no vent to allow air in as propane is pressurized, and only attains zero pressure at 40 below zero farenheit. The valve you speak of should have been the liquid vent valve which is used during filling only, and is closed during any other use. Your supply valve should be in the wide open position. The pressure relief valve is only operational when the tank has been overfilled or overheated. You should have a pressure regulator between the tank and the appliance you are trying operate. Hope this helped. Marvin

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