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Old 09-30-2019, 05:23 PM   #1
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Model: Vegas 27.7
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Tankless Water Heater (2020 Vegas 27.7)

Hello community,

I took my new RV to a local park for a dry run this past weekend and I have to say, everything went better than I planned. The only concern/issue I had was that the hot water fluctuated from hot to cold while taking a shower but not during usage of the sinks. Is there an adjustment I need to make to the tankless water heater thermostat/control? Can anyone share any similar experience and/or recommend a fix?
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Old 09-30-2019, 05:37 PM   #2
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The Girard system needs a bit higher than normal pressures to work correctly. If you add a 50 to 55 psi regulator: that should help a whole lot.
One other thing: it's always best to set the system to deliver the water at the temperature that you want, and then only use the hot water faucet.
Glad to hear that everything went pretty darn well for you!
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Old 09-30-2019, 06:56 PM   #3
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Smile

We have a Vegas 25.2 (2018) and had the same problem. I took it to the dealer, and they showed me the adjustment screw on the water pump. That regulated the pressure, and I set it correctly. Showers and sinks now all work fine.
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Old 10-01-2019, 12:34 AM   #4
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Had the same issue, searched online and found what jsavel mentioned. A small allen screw on the end of the pump. The pressure can be adjusted a bit at a time till the pressure is good. Bob Denman also mentioned to set it at the temp you want, did that and it works great.
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Old 10-01-2019, 03:20 PM   #5
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Thank you all for taking the time to shed some light with this issue...I really appreciate it!
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Old 10-01-2019, 03:33 PM   #6
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It's what we're here for...
We all have some questions, and we all have some answers!
Sharing them is how we ALL learn this stuff!
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Old 10-01-2019, 03:41 PM   #7
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Hot Water

I have found that for showering, setting the thermostat at 105 or 106 and 120 for washing dishes using only the hot tap. Water pressure is best at 55 PSI. It is a see what works best for you, personally we like the standard 6 gallon water heater where the water is hotter and arrives at the tap much quicker and you are not filling up the grey water tank as fast.
BTW it took us about a week of steady use to finally get it right
Coveman2
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Old 10-01-2019, 04:20 PM   #8
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We've also heard folks say that they fill their freshwater tank at the park (rather than hook up to City Water), and let their water pump make sure that the pressure is good enough...
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Old 10-01-2019, 04:59 PM   #9
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I had the same problem and learned the trick that solves it completely. Set the water temperature to 110 or what you want. Only use Hot water, no cold. The pressure is the same. If I am turning it off and on with a button, i leave the sink with a small stream of hot water to keep the heater going. It worked for me.
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Old 11-08-2019, 08:38 PM   #10
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Quote:
Originally Posted by Bob Denman View Post
The Girard system needs a bit higher than normal pressures to work correctly. If you add a 50 to 55 psi regulator: that should help a whole lot.
One other thing: it's always best to set the system to deliver the water at the temperature that you want, and then only use the hot water faucet.
Glad to hear that everything went pretty darn well for you!
How is the PSI adjusted??
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Old 11-08-2019, 09:22 PM   #11
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We are headed to the west coast Thor meet and stayed at an off the wall rv park last night.

Based on posts like this thread, we checked the amount of water lost before it's hot.
This morning it was 28 Ounces of cold water when we're on our internal water tank using our pump.

Last night It was about 8 Gallons of cold water(which prompted the test, we'd never had that happen before) using the land water due to low PRESSURE and it really didn't want to work well at all. Lots of problems when we were on low pressure.

We did the experiment for us, but you should have the same effect. Read your pump pressure and post it here.

We did another experiment:
When the indicator light on the internal water tank reads full, it really means less than half.
SeeView2 soon to be installed.
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Old 11-08-2019, 09:42 PM   #12
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That is a few of the reason we switched from the Girard to the Suburban 6 gallon tank. Just have not been able to do a real test as its freezing cold up here in Ontario Canada
but in our former motorhome the water was hot almost from the get go and no issues with water pressure having to be and exact number.
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Old 11-08-2019, 09:48 PM   #13
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Quote:
Originally Posted by budforlife View Post
How is the PSI adjusted??
Here's a link to what I use...

https://www.amazon.com/Valterra-A01-...3253257&sr=8-4
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Old 11-08-2019, 10:19 PM   #14
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I have determined that my waterless heater on my 2016 Thor is not igniting. Check fuse, okay. Any ideas??
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Old 11-08-2019, 10:32 PM   #15
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Did you also check your propane supply?
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Old 03-08-2020, 01:00 PM   #16
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Hello Jsavel

Quote:
Originally Posted by jsavel View Post
We have a Vegas 25.2 (2018) and had the same problem. I took it to the dealer, and they showed me the adjustment screw on the water pump. That regulated the pressure, and I set it correctly. Showers and sinks now all work fine.
We own the same model as you do!!!! Iím having problems with not getting hot 💦 can you tell me where is the water pump located so I can find the adjustment screw? Also should my water pump be on while We are at the RV site in its entirety? We are still fairly new RVing🤗. Thank you in advance🙂
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Old 03-08-2020, 02:32 PM   #17
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The water pump should be located under the sofa. At least it is in mine.
John
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Old 03-08-2020, 02:45 PM   #18
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I use an adjustable water pressure regulator and set it to 55. I set my hot water to 106 and only use the hot water. I can now take a long hot shower as well as everyone else that is with me camping. No more waiting for the hot water tank to heat up with the endless hot water system.
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Old 03-14-2020, 12:57 AM   #19
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Thanks everybody

Thank you all for the assistance 😁
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