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Old 03-27-2012, 02:31 AM   #11
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Is it possible that the w/h bypass is open between the cold and hot lines and is feeding cold and back-feeding hot as the pressures vary?

(I have a tankless in my house and love it. Also, it has cut my gas bill by 1/3. That said, not sure the pressures in an RV lend themselves to this technology.)
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Old 03-27-2012, 03:12 AM   #12
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how about installing a checkvalve on the inlet side of the water heater. Might help with any flow inversion/reversion on the cold water side that could be tripping the water heater flow sensor?
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Old 03-27-2012, 08:59 PM   #13
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Thank you all for your suggestions and ideas. Just got back from our visit to white sands and white sands missile range. It turns out the air in the outdoor shower was the culprit. Thank you WildcatChris for passing my situation on to your contact and giving me their response. I ran both the hot and the cold water until there was a steady stream of water coming out and had my wife flush the toilet. Two things I noticed. One, no loud thunk or hammer when the pedal is brought back up after a flush, and two, the tankless doesn't kick on! So, I'll have to put that on my check list of things to do when I dewinterize the rig next year.

I almost thought I was going to have to ask what would cause the trailer to jump when the a/c cut off. Turns out we heard our first sonic booms!! We are in Alamogordo for the week and the boys were out playing late this afternoon. All we heard was a loud BOOM and the trailer shook like someone backed into it. I swear we got out of the trailer twice to see who hit us!! Now if I can just see an F-117 I'd be a happy camper...pun intended!

Thanks again everyone!
Bob
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Old 03-27-2012, 10:47 PM   #14
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Originally Posted by 4x4man View Post
Now if I can just see an F-117 I'd be a happy camper...pun intended! Thanks again everyone! Bob
No joy in Mudville. F-117s have been retired for some time due to composite wing cracks. Need an air museum to see an F-117.

Now if you see an Aurora, THAT would be something!
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Old 03-27-2012, 11:07 PM   #15
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Bummer, did not know that about the F-117. Guess the F-22 replaced it? Maybe I'll do some web surfing and see if they have an F-117 somewhere around here on display.
Off to the Carlsbad Caverns tomorrow.

Bob
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Old 03-28-2012, 05:32 AM   #16
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4x4man, thanks for coming back and telling us exactly what the solution to your problem was, it might be helpful to others in the future.
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Old 03-28-2012, 07:44 AM   #17
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Bummer, did not know that about the F-117. Guess the F-22 replaced it? Maybe I'll do some web surfing and see if they have an F-117 somewhere around here on display.
Off to the Carlsbad Caverns tomorrow.

Bob
Lockheed F-117 Nighthawk - Wikipedia, the free encyclopedia

Pretty much the whole story.
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Old 03-28-2012, 02:42 PM   #18
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Talking Tankless/"endless" hot water in an RV? Yep.

Quote:
Originally Posted by 4x4man View Post
Thank you WildcatChris for passing my situation on to your contact and giving me their response. I ran both the hot and the cold water until there was a steady stream of water coming out and had my wife flush the toilet. Two things I noticed. One, no loud thunk or hammer when the pedal is brought back up after a flush, and two, the tankless doesn't kick on! So, I'll have to put that on my check list of things to do when I dewinterize the rig next year.
You're very welcome! I'm glad we could help...

For the sake of discussion, we've had a number of people call in to Girard over the last year and half with questions about the tankless water heating system and many times it's just getting used to a brand new system. I appreciate the opportunity to help -- this new technology is becoming more and more popular (nearly 25% of the aftermarket is now Girard's tankless systems)!
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Old 03-28-2012, 05:58 PM   #19
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I don’t know if you are aware of this feature, but your Girard tankless water heater is plumbed so that when your water pump is on and the temperature drops to 36 degrees, it will pump hot water back into your fresh water tank.

I’m not sure how all this works or how long the pump continues to send water back into the fresh water tank but it is an interesting feature isn’t it? If I’m wrong about this I hope Wildcat Chris will shed more light on the subject.
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Old 03-28-2012, 10:31 PM   #20
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Oakman, you are correct our water heater has this feature installed. The documentation included calls this a WUD (Winter Use Device).
To sum up, whenever the temp at the thermostat in this device that is plumbed to the water heater reaches 38 degrees it will flow water back to the fresh water tank until the temp reaches 50 degrees and then it closes the flow of water off. It states it will take about 45 seconds.
Bob
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