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Old 08-02-2015, 08:11 PM   #1
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Atwood Tankless Heater

Just traded my 09 Georgetown 350TS for a 16 Berk 38A. So far we love it but have a question regarding the tankless water heater. During our first outing the hot water was only warm until I turned on more than one tap. Obviously I assume that the tankless system has to have a certain flow to fully heat. Is this correct? Also I did not use the water pump because the pressure seemed to be adequate. Thanks in advance for help.

Regards, Sam
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Old 08-03-2015, 09:10 AM   #2
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You don't run or use the water pump when hooked to city water, only when your fresh tank has water and city water is not available.

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Old 08-03-2015, 09:16 AM   #3
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I should have written that I did not fill the tank and try the water heater with the pump on. My bad.
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Old 08-03-2015, 12:11 PM   #4
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I have the Girard heater, but the physics are basically the same as the Atwood. Does your unit have a high/low switch it any adjustment for the temperature rise? Our Legacy has a knob in the front bath that allows for adjustment to the temperature rise for seasonal variance in the incoming water temp. In other words, if the water coming in is at 45F or 85F, you adjust the rise to get to the preferred hot water temp, probably about 105F. The other thing to remember is flow rate. The higher the flow rate, the less time water spends in the heating coil. Turn on the hot water only to full flow. Don't use cold water to adjust the temp. If you want the water warmer, just reduce the flow using the faucet and the water temp will rise. If you can't get it warm enough that way, turn up the temp rise adjustment mentioned earlier.

Hope this helps and makes sense. It's definitely a learning experience.
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Old 08-04-2015, 01:38 PM   #5
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In order for the tankless water heaters to work properly, all water lines must be fully "charged". Air bubbles in the lines compromise the pressure in the closed water system which effects how the thermostat works. So make sure hot and cold lines run until the stream is solid (there are no more air bubbles escaping); sinks, shower, outside shower, toilets, and ice maker. Then, as a previous poster indicated, adjust the hot water temperature with your thermostat.
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Old 08-04-2015, 01:52 PM   #6
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Conceptumator, Thank you for the information. I will look in the front bath to see if there is an adjustment.

Regards, Sam
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Old 08-04-2015, 01:59 PM   #7
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Quote:
Originally Posted by secfan90 View Post
Conceptumator, Thank you for the information. I will look in the front bath to see if there is an adjustment.

Regards, Sam

If your unit has an Atwood as the topic title indicates the temp adjustment is outside on the water heater. Small red dial does the regulating.


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Old 08-04-2015, 02:23 PM   #8
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Wayne,

Thank you I did look to adjust it however I found that the temperature was set correctly when the entire burner pad turned on. Once I got the flow high enough it heated perfectly. When I would turn the shower on by itself only half the heating pad would ignite. Once I turned the sink on (for a few seconds then off) as well the entire pad ignited and everything was great. I have a tankless system in my house and thought it had to have something to do with flow. I guess that we did not have enough at that campground. That is my reasoning however crazy it may sound. I am just glad that it worked.

Regards, Sam
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Old 08-04-2015, 02:34 PM   #9
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That does sound like maybe you had air in the lines, since you were able to increase the flow rate by simply bleeding the rest of the system. I know they say this is critical, but I've never had a problem - don't seem to get air in the lines. Here's something I do that might help. When hooking up at the campground, connect the hose to the hydrant first and turn it on until the flow is consistent out of the hose (no air), then connect to the MH. Otherwise, you're just pushing a hose full of air into the system every time you connect. The other poster is correct, also, about the Atwood control being outside. The Girard control is in the front bath cabinet on my Legacy.
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Old 08-04-2015, 02:40 PM   #10
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Conceptumator, You are absolutely correct. I just realized that I hooked up my water hose without turning it on. Wow! I can't believe that I didn't do that. Thank you! Air in the lines was mentioned earlier and I just didn't think about the hose itself. Sometimes I just need the DA of the day award. LOL

Regards, Sam
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