Onion/egg smell from hot water.

I have the same problem with one cold water line running to my bathroom basin. This has been a continuous problem since the first year I bought my fiver. I have bleached the system and bleached only that particular line and the problem returns in a couple of weeks. It is getting to the point that I am going to try and replace that cold water line and the basin faucet to see if that will fix it for good.

most of that was leftovers from the anode. A friend had one that fell apart and clogged all his hot faucets, not just the aerators. He had to replace them both.

Our local RV repair facility recommended a wand for the end of a hose. Remove the drain plug and wash out all the sediment from the bottom of the heater tank. Fixed our problem!

It can also be caused by water with some sulfur content.
The following is from the Atwood service manual:

"1. Turn off your main water supply. Drain your water
heater tank. Reinstall drain plug. Remove the
pressure-temperature relief valve. With a funnel
use 4 parts white vinegar to two parts water. (In a
6 gallon tank that would be 4 gallons vinegar to 2
gallons water).
2. Cycle the water heater, letting it run under normal
operation 4-5 times. At no time do you remove the
vinegar from the tank Once this has been
completed, remove the drain plug and drain the
water heater.
3. After thoroughly draining the tank, to remove the
sediment, flush the water heater.
If you elect to use air pressure, it may be applied
either through the inlet or outlet on the rear of the
tank or applied through the pressure-temperature
relief valve. Remove the pressure-temperature
relief valve and insert your air pressure through
the pressure-temperature relief valve coupling. In
either case, with the drain valve open, the air
pressure will force the remaining water out of the
unit.
If air pressure is unavailable, your unit can be
flushed with fresh water. Fresh water should be
pumped into the tank either with the onboard
pump or external water pressure. External
pressure may be hosed into the unit either
through the inlet or outlet found on the rear of the
tank or the pressure-temperature relief valve
coupling located on the front of the unit.
Continue this flushing process for approximately
five minutes allowing ample time for the fresh
water to agitate the stagnant water on the
bottom of the tank and forcing the deposits
through the drain opening.
4. Upon completion of the steps above, replace the
drain plug and the pressure-temperature relief
valve.
5. Refill tank with fresh water that contains no
sulphur."

Anything further to do?

Hi Ben,
The rotten egg smell is caused by bacteria reacting with the anode in the HW tank. Both aluminum and magnesium can cause this odor... If cleaning with chlorine bleach or hydrogen peroxide doesn't solve the problem, then switch to an aluminum/zinc anode.
Cheers,
-Mark

If you have an anode rod and it is magnesium it could be reacting with the water that you are using. An aluminum rod would help that. Otherwise as stated above...flush...

I drain my hw tank between trips if it's going to be more than a couple of weeks. I drain the fw tank too.

I've never had a problem with the water quality in my tanks.

Mitch

Well, besides flushing the system. Other than that, you probably got it.

nope. you got it.