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Old 01-24-2016, 12:58 PM   #1
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Help on hot water heater

We have a new Atwood heater and we get hot water and then goes cold for 60 seconds and then hot, etc. Any thoughts
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Old 01-24-2016, 01:01 PM   #2
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Have you checked you bypass valves? This can be a common reason for your symptoms, in being the bypass valves are incorrectly set.

I also think I read where there is a recall on certain Atwoods too, if you have a tankless one.

RKNOLA reposted the above recall again just the morning:

http://www.forestriverforums.com/for...ml#post1085035
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Old 01-24-2016, 04:20 PM   #3
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Tankless, or on demand, heaters are a strange lot and take a lot of getting no used to. We have the Girard Gen II and once we got through the learning curve and replaced the faulty switches and sensors it works great, though contrary to logic. First, remember the temp is meant to be set so you use only hot water, not mixed. You can get the results you described if you're mixing cold water in, like you would do in your house. We've found we can slowly blend in just a smudge of cold at the faucet if we really need to but you have to be gentle with it. Remember the temp adjustment us not for a specific water temp like your house, but t's actually for the Delta T, or temp rise from incoming water temp to usage temp. If you have 65F incoming water, you only want about 40 degrees rise to get 105F water at the faucet. In the winter, incoming temps of 45F will require more temp rise. You can increase the temp rise to some extent with the adjustment switch, but you can also make the water hotter by simply reducing the flow at the shower head to make the water go through the heat exchanger slower. Hope this helps some. Good luck!


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Old 01-24-2016, 04:37 PM   #4
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Originally Posted by zimmnc View Post
We have a new Atwood heater and we get hot water and then goes cold for 60 seconds and then hot, etc. Any thoughts

A couple of things to check. First you do not have bypass valves or switches so don't go looking for them. Your Atwood WH has a bunch of sensors and cutoffs that can cause those symptoms. First make sure that the black rubber tube is clear. And bugs or even water will make it stop working. Also do you have good water pressure? You need 40 psi or more to really have it work good. Also check the temperature adjustment and try turning it down. It sounds like the water is getting to hot and the high limit is shutting the burner off.
Are you just running hot? If you are trying to run both hot and cold at the same time that can cause the hi limit to kick in also. Try most hot and turn down the temp to get the right mix. It takes some getting used to. I have had the Gerard gen one and two as well as the Attwood. I like the Attwood the best.



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Old 01-27-2016, 08:24 AM   #5
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My question is : Are we talking about an on demand unit or a 6 gallon water heater??

Russell
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Old 01-27-2016, 09:03 AM   #6
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My question is : Are we talking about an on demand unit or a 6 gallon water heater??

Russell
It's posted in Berk forum, so I'm guessing on demand.
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Old 01-27-2016, 09:04 AM   #7
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It's posted in Berk forum, so I'm guessing on demand.

Is yours Tim in the g town?


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Old 01-27-2016, 09:07 AM   #8
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Answer

Yes it is on demand
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Old 01-27-2016, 09:19 AM   #9
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Is yours Tim in the g town?


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No, I have 2 6 gallon tank heaters. One for each bath.
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Old 01-27-2016, 09:24 AM   #10
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No, I have 2 6 gallon tank heaters. One for each bath.

Suweet!


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Old 01-27-2016, 09:24 AM   #11
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My question is : Are we talking about an on demand unit or a 6 gallon water heater??

Russell

I had to go back on the OP's previous posts to check what Moho model he had.
To the OP. Please include your model and year in your profile so we can help without searching to much. It's very helpful to have that info available.
Wondering how the WH is doing. And luck in figuring it out?



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Old 01-27-2016, 10:11 AM   #12
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Well on demand then-- just a big learning curve!! I went thru this and with some replacement parts all working OK now. Mine is a gen II Girard-- Big thing is to try and use water on hot only then adjust your settings to work with that.

Bad thing on mine is outside temp -income water pressure- all affect it-- In this park the water pressure can change depending on what the demand in the park is ??

I like the sound of those two small hot water tanks !!!

Russell
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Old 01-27-2016, 10:19 AM   #13
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Well on demand then-- just a big learning curve!! I went thru this and with some replacement parts all working OK now. Mine is a gen II Girard-- Big thing is to try and use water on hot only then adjust your settings to work with that.

Bad thing on mine is outside temp -income water pressure- all affect it-- In this park the water pressure can change depending on what the demand in the park is ??

I like the sound of those two small hot water tanks !!!

Russell
IKR! I didn't mention the dual water pumps though. 2 showers at once!
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Old 01-27-2016, 10:31 AM   #14
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IKR! I didn't mention the dual water pumps though. 2 showers at once!

We always do two showers at once!! Don't all couples do that ! When they been married 47 years like us ?
Could be a little truth stretching here??

Russell
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Old 01-27-2016, 10:42 AM   #15
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We always do two showers at once!! Don't all couples do that ! When they been married 47 years like us ?
Could be a little truth stretching here??

Russell
I'm not sure we could get 2 people in either shower. Drop the soap, and someone would have to get out!
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Old 01-27-2016, 12:06 PM   #16
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Well on demand then-- just a big learning curve!! I went thru this and with some replacement parts all working OK now. Mine is a gen II Girard-- Big thing is to try and use water on hot only then adjust your settings to work with that.

Bad thing on mine is outside temp -income water pressure- all affect it-- In this park the water pressure can change depending on what the demand in the park is ??

I like the sound of those two small hot water tanks !!!

Russell

On the Atwood I find setting the temp to a hot setting works great. The Atwood works different than the Gerard. I have my Atwood set hot. To hot to use just hot water. I then mix cold in with it more similar to a conventional water heater.
With the Gerard this would not work.



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Old 01-27-2016, 02:54 PM   #17
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On the Atwood I find setting the temp to a hot setting works great. The Atwood works different than the Gerard. I have my Atwood set hot. To hot to use just hot water. I then mix cold in with it more similar to a conventional water heater.
With the Gerard this would not work.
Phil; You must have started with a Girard Gen I. With the install of the Atwood, did the outside door have to be changed?
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Old 01-27-2016, 03:22 PM   #18
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I did start with a Gen l then to a Gen ll. With the Atwood I did need a new door. I don't know how the Gen 3 works first hand. I hear great reviews about it. I will say the Atwood is a huge improvement over Gen 2.



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Old 01-27-2016, 03:45 PM   #19
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My Girard Gen 2 works the way it should. Only complaint is it is noisy. Vibrates like heck.
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Old 01-28-2016, 11:45 AM   #20
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If the Gen II is vibrating, I would suggest taking a quick look at the exhaust fan to be sure the blade isn't broken. That's the only moving part in the entire heater.
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