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Old 09-20-2020, 11:36 AM   #1
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Unhappy On Demand Water Heater Problems

Problems with an On Demand Hot Water Heater.

I have a Girard Model GSWH – 2 Tankless Water Heater in my 2017 Tiffin Wayfarer Motor home. The problem is intermittent and frustrating. It works properly about 20% of the time. I do a lot of dry camping and four days without a shower is unacceptable.
I purchased this motorhome used and the issue has been present from the very beginning. I have had it into the RV place where I purchased the motorhome. Their hourly rate is $140 and after many hours they could not get it to malfunction. I have wiggled wires, reset, and completed the flow rate test. ( 1 gallon per minute) It passed with flying colors. I have called the Girard helpline once. He suggested the flowrate test. Since I can not find anyplace to take it, what else can I check to solve this problem?
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Old 09-20-2020, 12:09 PM   #2
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Dont have an answer but mine is brand new and does not work worth a darn...have a new Forrest River XLR 39 AMP 5th Wheel...this tankless hot water heater has been a POA to date...mine works 10% of the time...very, very tempoermental...wish I had opted for the old style hot water heater now...
T
Gonna try and all the help line at Girard tomorrow if they have one. Will respond back if I can find some helpful info....
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Old 09-20-2020, 12:40 PM   #3
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I ran into a couple in Vegas who were so frustrated that they paid Camping Work to rip out the on-demand water heater and install an old-style tank water heater!
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Old 09-20-2020, 12:41 PM   #4
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You didn't state specific what issue is just that "....intermittent and frustrating. It works properly about 20% of the time."

Dealer checked it out, tested it BUT was that using a city water/hose OR your pump?

Here is the TECH SERVICE MANUAL
Great Info and may give you ideas to check/test
https://www.rvupgradestore.com/v/vsp...e%20Manual.pdf
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Old 09-21-2020, 07:38 AM   #5
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On Demand Water Heater

Quote:
Originally Posted by Old-Biscuit View Post
You didn't state specific what issue is just that "....intermittent and frustrating. It works properly about 20% of the time."

Dealer checked it out, tested it BUT was that using a city water/hose OR your pump?

Here is the TECH SERVICE MANUAL
Great Info and may give you ideas to check/test
https://www.rvupgradestore.com/v/vsp...e%20Manual.pdf

Thank you for the Tech service Manual
When I wrote it works intermittently, I meant the “little flame” and the “fan” do not come up on the display when the water pump is on. There is no hot air coming out the exhaust pipe on the outside of the unit. All of this means I don’t get any hot water.
The dealer filled it with water and used the pump as well.
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Old 09-26-2020, 07:36 AM   #6
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On Demand Water Heater

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Originally Posted by Big Andy View Post
Dont have an answer but mine is brand new and does not work worth a darn...have a new Forrest River XLR 39 AMP 5th Wheel...this tankless hot water heater has been a POA to date...mine works 10% of the time...very, very tempoermental...wish I had opted for the old style hot water heater now...
T
Gonna try and all the help line at Girard tomorrow if they have one. Will respond back if I can find some helpful info....
Did you get any helpful information from Girard service when you called them?
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Old 09-28-2020, 11:29 PM   #7
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I have not yet attempted to call for factory help. I did buy a variable rate water pressure regulator and set the pressure to approximately 55 pounds. The unit seems to work pretty well with that pressure as it’s obvious the water pressure is what activates the operational features of this tankless hot water heater. Having said all that I’m going to use it for a little while but I’m not at all sure that I’m gonna stick with it because it’s a totally different procedure than the old fashion furnace type hot water heater.

I will be happy to repost if I end up calling the factory as I mentioned that I would. The only reason that I didn’t call them was because the ajustable water pressure device helps solve some of the problem.
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Old 09-30-2020, 08:58 AM   #8
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On Demand Hotwater heater

Big Andy,
Thank you for your update.
I have an appt. with a dealer and I will definitely mention the pressure regular.
I appreciate anything you learn from experience..

Ivygirl
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Old 10-01-2020, 08:07 AM   #9
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FYI...while the tankless water heater is working well with city water at 55 lbs input pressure, it will not stay lit up heat wise if I use the water pump from the fresh water tank..my conclusion is that there must be some water input pressure adjustment. I need to read the manual to see where that adjustment might be. If I cant find it, then I will attempt to call the factory for help.
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Old 10-01-2020, 08:12 AM   #10
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Adjustable water pressure valve....Approx $26 from Amazon
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Old 10-01-2020, 08:35 AM   #11
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adequate water pressure is the answer. i installed a new pump with a high flow rate, and set the pressure as 55 lbs of pressure, or near as i could with a gauge, and it works ok.
i have the newer one with a programmable thermostat, and use only the hot water side of the shower faucet. i mean with the one lever kind, all the way to hot.
it maintains 104 degree water continuously. without being hooked to city water.
as i said, adequate pressure is the answer.
i do not work for girard, nor do i receive any compensation from them.
i work full time for hwh corp.
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Old 10-02-2020, 07:46 AM   #12
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Thank you! Keep me posted. So frustrating.
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Old 10-02-2020, 08:31 AM   #13
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I think the question is answered...55 lbs water pressure and the unit works well...

Guessing I need to install a new water pump so that house pressure is also 55 lbs as you state...

My unit working well as long as water pressure is 55 lbs....

Given I have a new Forrest River 5th wheel...the Mfg should installed a water pump that delivers 55 lbs since this is what seems to make the Girard tankless work well....
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Old 10-02-2020, 08:33 AM   #14
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@azpete,

What brand of house water pump did you buy to get the 55 lbs of fresh water tank water pressure?

Thanks

Big Andy
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