No hot water flow, stopped up ?

MrWizard wrote:
Yes there was some calcium deposit, I cleaned out of the elbow, there could be some in the WH but all I ever get when flushing or draining is clear water, any deposits are harden and pre-existing from the previous owner, I was surprised when I saw the deposits in the elbow and check valve,
I thought about removing the pop off valve and pouring a few gallons of CLR into the water heater via a funnel and letting it soak overnight, put it on bypass leave it turned off,
Then drain & flush the next day
Any body try this,
I've been looking at Cellphone Borescopes online , it's been several times now that I could have used one to inspect a problem situation

I'm not sure about the CLR treatment, but I have done the Atwood white vinegar boil out on several Atwood water heaters. Atwood had instructions for this in their service manuals, I did not come up with this myself. The basics are on a 6 gallon water heater, add 4 gallons of white vinegar with 2 gallons of fresh water. I drained the water heater, then pumped the vinegar in using the camper winterizing valve at the water pump, followed with 2 gallons of fresh water. Let the system heat and soak with it on and hot. I have left them on and hot overnight when the scale is real bad. Drain all vinegar and flush.

The Attwood procedure shows up on the page 27 of the 2004 Atwood service manual and other years service manuals tweaked slightly pending the publication date. See here on Chris Bryant's site, all the way to the bottom under Miscellaneous Documents. I knew I could find it here for you.
http://bryantrv.com/docs.html

I have borescope'ed the heaters before and after the vinegar boil out. It has been very effective in removing the scale build up. I have some pics inside if you want, I'll hunt them up, just let me know.

Hope this helps

John