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Old 12-20-2014, 07:48 AM   #1
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Fluctuating temp on tankless water heater

2014 Berk 390 BH, Not happy with the temp fluctuations when showering, any suggestions? Dealer checked with thermo gun. Says it's only fluctuating 6 degrees. That's a lot on bare skin.

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Old 12-20-2014, 08:30 AM   #2
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Search in here and you'll find a topic that has lots of info. Turn water heat temp way low and be sure you have no air in lines and proper water pressure. Works for us...

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Old 12-20-2014, 08:55 AM   #3
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Check outside shower to insure that faucets are turned off ( not just shower head). If faucets are on it will allow cold water to enter hot side.

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Old 12-20-2014, 09:35 AM   #4
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That's one of the reasons I decided to stay with a regular Suburban 10 gal when I replaced my HW heater last year..... Came close to changing to a tankless one but after reading numerous comments on this forum, I decided I liked not having to do all the things required to maintain a constant temp with the tankless....

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Old 12-20-2014, 11:03 AM   #5
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Use a pressure regulator that is adjustable and has a pressure gage. I find 50-60 lbs works best. If the park has low pressure use your pump. Use a high pressure low flow shower head. You can get them at camping world. All air out of lines. Adjust your thermostat so that the water is only warm when on full then you can turn the water in the shower down but still on all hot until the temperature is right for you. If you have the temperature set to high you can't get enough flow to cool it off. If this doesn't make since pm me and I will give you my phone number and we can talk about it.
They are tricky and I get feed up sometimes but they are nice in that you don't run out of hot water.

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Old 12-20-2014, 11:14 AM   #6
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I think what Phil is trying to say is that you should try to adjust the water heater so that the temperature of the hot water coming out is right for showering without having to mix in cold water. You would just use straight hot water for showering. I found that this method has worked well for us.
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Old 12-20-2014, 11:49 AM   #7
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I too have had mixed success with the Girard tankless heater. Does any one have better success with other tankless brands such as Suburban or Atwood??

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Old 12-20-2014, 12:01 PM   #8
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We had the Girard tankless water heater on our 2013 Wildcat. We really enjoyed it in the months that were cooler, buy cooler I mean that the water coming into the RV was cool not the ambient outside temp. Once the summer temps warmed up which in effect conducted warmer to hot temps to the ground around the buried water pipes meaning warmer water entering the rv and tankless water heater it became much more difficult to control a constant water temp in the shower.
We had to take the Wildcat in for an unrelated issue at the Wildcat Warranty Service Center in Elkhart and mentioned this problem. I told them I was aware to make sure there was absolutely no air in any of the water lines and the manufactures procedures to operate the system and helpful hints on correcting this matter.

Wildcat contacted Girard who said there was a retro fit kit that could be installed and in most cases took care of the situation. However, Wildcat also offered to replace the water heater with a new tank heater that would run on both electric and gas. We accepted that offer and are pleased that we did. We have not run out of hot water during a shower and have be able to maintain a nice even temp of water flow. As an added bonus we seldom use the gas when calling on hot water using the electric most of the time and allow the campground to pay the cost to heat the water.
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Old 01-01-2015, 08:58 PM   #9
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I have a 390bh-60 and agree that turning the water temp regulator down is the right solution.
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Old 01-02-2015, 08:46 AM   #10
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Please note that Girard only upgraded the water heater a couple years ago with the variable temp. setting. Most of us ( with even late model Berks)have a heater with only one burner setting or in some cases two.
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