Question about RTO Atwood Water Heater - 6 Gal LP

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Is the atwood g6a7 hot water tank interchangeable with the atwood g6a3 tank

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Mike Butler

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If your replacing complete tank and front face, yes. If just replacing aluminum tank itself, take a look at front face and see if it has all the same holes for pressure relief valve, etc. Either 6 gallon tank will fit, it's usually the features that are different, such as electronic ignition, or one has gas and hydro operation, where other is gas only. Obviously the electronic ignition requires a 12 volt DC source for it to work, where just manual light does not, as well as 120 volt operation requires a hydro hook-up if you want to use that option of it.

Posted on Jun 27, 2010


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No you need to replace that valve.

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Orifice at end may be plugged. You need to remove from end where flame appears, and check orifice.

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I have a G6A7 heater and the alluminium tank has split due to water freezing, can i get just the alluminium tank? Helen

Yes, you can buy just a replacement tank. Any RV dealer/parts should be able to give you a price, or even check campersworld site. Please keep in mind that it is a fair bit of labor involved in changing just the tank because you have to remove all the parts from old one, and re-install them on new one. If your water heater is getting on in years, it sometimes pays to replace complete unit with new gas valve, pressure relief, burner etc., already installed, and warranty comes with it. I've seen older ones get replaced and then gas valve goes next, etc etc, and it ends up costing more in the end. I'm not trying to sell you on this idea, just advising from experience.

Jan 14, 2011 | RTO Atwood Water Heater - 6 Gal LP

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Mt 6 gal. atwood hot water heater ignites but will not stop I put a new relief valve on it because it was leaking.

Excessive temperature from running too long will cause relief valve to open. If water temperature is too hot, thermostat & ECO should be changed. They are in behind that little foam cover where the letters are marked on cover. Check that they are up against tank good when you remove foam cover, as that may be the cause as well. They need to be held against tank, by the little coil spring and retainer. If they are against tank good, then replace them.

Dec 09, 2010 | RTO Atwood DSI-RV Water Heater-6 Gallon

1 Answer

Have a 2005 coach w/Atwood DSI-RV 6 gal water heater. Gas lights, heater fires and gets hot, but doesn't transfer the hot water through the lines to the sink faucets. [email protected]

You need to check by-pass valve(s) on back of tank for proper position. You need cold open going in to bottom tank fitting, and hot open at top. If any valves in between those 2 lines via "T"'s, turn them to off position.

Oct 29, 2010 | RTO Atwood DSI-RV Water Heater-6 Gallon

1 Answer

Hot water comes out cold side for few seconds and gets cold, no hot from hot side, only cold

Make sure that the water pipes for the cold water coming in and the hot water going out are connected to the correct positions on the water heater. If the connections get reversed, the water that is supposed to be hot will be drawn from the bottom of the tank and will not be as hot as it should be. The cold water input goes to the bottom of the tank. The hot water out comes from the top of the tank.

Oct 09, 2009 | RTO Atwood DSI-RV Water Heater-6 Gallon

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