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Old 12-13-2015, 05:25 PM   #1
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Tankless water heater issues

I just recently purchased a 2016 Greyhawk 29MV that is equipped with a tankless water heater. This is my 4th RV, second motorhome. We have had nothing but problems with this water heater. Inconsistent water temp. Having to reset the unit with almost every use. I was wondering if others are experiencing similar issues and has Jayco addressed them?
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Old 12-13-2015, 06:06 PM   #2
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I had the same experience with mine. Figured out you can't use a low flow shower head, you must turn the hot water on full to get sufficient flow, you have to fiddle with temp control in the head to get it right. I hated it enough to change it out. A 6 gallon Suburban fits right in the hole.

That being said, other folks have had good luck with them and really like them. Here's a link to somebody else that had the same experience I had.
https://www.jaycoowners.com/forums/f3...7ts-31841.html

So if you don't mind fiddling around with the temp control to get it right and you don't mind wasting the water, you can get there. Just don't use a low flow shower head.

FYI, there's a search button up toward the top of this screen. You can dig up more comments about these water heaters using that button. However, you really won't have to as I'm sure other folks will chime in with their opinions shortly.
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Old 12-13-2015, 06:14 PM   #3
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There are lots of opinions that differ about tankless water heaters in RV's; I've decided that the current tankless heaters that are available do not meet my needs. You could search for the word "Girard" and turn up many threads. Here are three threads to get you started:

thread 1 clicky

thread 2 clicky

thread 3 clicky (86 posts!)
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Old 12-13-2015, 07:37 PM   #4
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I have a Seneca and I had the same water delivery problems, coupled with the fact we camp without water and sewer hookups frequently. And to "just let the hot water run" wasn't a viable long-term option in less than full hookup campsites. The other posters are correct, a 6-gallon traditional tank unit will fit in the cutout, it is just deeper than the Girard. But I took a different path, I wanted more hot water capacity so I installed a 10-gallon Atwood XT. I had to enlarge the cutout, but it went very well.

Another advantage to a tank-style unit is that if you install one with both propane and electric heating so you can heat your water from the campground electric if desired. Once I am plugged in for several hours I have a hot tankful and I, the wife, and two grandkids can all shower and never have burned an ounce of propane yet have hot water to spare.

Jayco has replaced a number of Girard units under warranty (and in some cases) with a traditional tank-style unit. I was told this directly from Jayco Service when I recently dropped off my rig there to have a serious slide issue and several smaller "bugs" repaired. They are going to paint the new Atwood water heater outside cover to match my coach free of charge since I already took care of the water heater replacement myself.
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Old 12-15-2015, 05:03 PM   #5
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Differing opinions on this topic, across many threads. I have had NO problems with the tankless water heater. We love it. All the hot water we want, all the time.
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Old 12-15-2015, 05:56 PM   #6
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My Girard worked albeit not well at lower elevations. At 7,000 ft and higher we had NO hot water. Jayco replaced it with a 6 gal Atwood.
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Old 12-18-2015, 10:47 PM   #7
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I've had my Greyhawk 31FS for nearly two years now (almost out of warranty, will probably hit the mileage before the years). We have mixed feelings about the tankless unit. We are using far less propane that we did with other rigs (we've been RV'ers for 35 years) with conventional water heaters. Is this because it uses less gas or are we just more frugal, I don't know. When we decide to be waste the campground's water and take a long leisurely shower, it works great cause we never run out of hot water. I live and travel extensively in drought stricken California, wasting water is a no no so I do feel a bit guilty when I take advantage on just running the water for a long shower. Dry camping is a real challenge because it wastes water and you've lost the extra six or more gallons in the water heater. It is a challenge to master the temp. Getting the temp right took about a year to figure out, but we finally did. The problem is that you are not setting the temp of the water coming out of the faucet or shower, you are telling the water heater how warm or cold the water coming INTO the water heater is. I don't know about the rest of the folks on this forum, but I don't have a water thermometer in my rig nor do I particularly want to turn the shore water off and disconnect the water lines so I can test the temp coming into the rig. In cooler weather, you might have very cold water coming into the system in the morning and warmer water during the day. I don't understand why Girard didn't put a sensor in the unit to manage this function. I cannot imagine that folks living in a home with an on-demand water heater are forced to fiddle with this setting instead of the unit have it's own sensor. In conclusion, we've learned to like the thing though I'm not sure what I would do if something happened to the unit and it needed to be replaced. Murphy's law says, I'll never get that chance.
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Old 12-19-2015, 05:30 AM   #8
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I don't understand how these tankless water heaters ever made it into the RV market.

The operating characteristics of these things is contrary to the typical RV water usage concepts. ie: Minimal water use.

Now if you always camp with with full hookups it's a mute point. My personal experience is only about 20% of my outings have full hookups.
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Old 12-19-2015, 08:33 AM   #9
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Girard GSWH-2 Water Heater

Quote:
Originally Posted by Forelyndogs View Post
I don't know about the rest of the folks on this forum, but I don't have a water thermometer in my rig nor do I particularly want to turn the shore water off and disconnect the water lines so I can test the temp coming into the rig. In cooler weather, you might have very cold water coming into the system in the morning and warmer water during the day. I don't understand why Girard didn't put a sensor in the unit to manage this function.
I think the newer Girard tankless water heater (model GSWH-2) better monitors the temperature of the water stream. If anyone has one of these, I'd be interested in how well it works.

We have the GSWH-1M and have had some of the same issues as others, but with some practice we are making it work.
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Old 12-19-2015, 12:12 PM   #10
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In my opinion, there are several reasons the RV industry has jumped on the on-demand water heater bandwagon. Number one and perhaps most important, they are much less expensive. Look at the prices for standard water heaters and those for on-demand types in Campingworld catalogs and their website. It would be nice if we, the buyers, benefited from that savings, but that would cut into the makers profit. They also take less space which eventually the builders will utilize, eliminating the ability of us owners to switch them out for standard units. Then there are the so called benefits to us the buyers; reduced ( for me dramatically reduced) propane usage, endless flow of hot water when hooked to campground water supply, and you really don't need to turn the thing on and off when traveling. Finally, as we all know various government mandates dictate what auto makers can and cannot do. It wouldn't surprise me if meeting energy efficiency requirements are forcing RV makers to hunt for any imaginable saving, even if small.
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