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Old 09-16-2020, 12:37 PM   #1
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On demand water heater

I have a 2017 Jayco Greyhawk with an on-demand water heater that provides dangerous hot water temperatures. I have it set to 104 and itíll run up to 120F. It appeared to be intermittent so thinking it was varying water pressure at different parks, I put a pressure regulator on. Still intermittent. Any ideas?
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Old 09-16-2020, 12:56 PM   #2
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Sounds like the thermostat that regulates the heating coil is toast. Try a search online for the temperature regulator or thermostat for that specific model number. It may be a simple fix. Water pressure has no effect on the temperature, it should always shut off when it hits the set max.

Only took a second to find this youtube on it but you didn't mention the exact model so you may have to look further.
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Old 09-16-2020, 01:20 PM   #3
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Originally Posted by RogerR View Post
Sounds like the thermostat that regulates the heating coil is toast. Try a search online for the temperature regulator or thermostat for that specific model number. It may be a simple fix. Water pressure has no effect on the temperature, it should always shut off when it hits the set max.

Only took a second to find this youtube on it but you didn't mention the exact model so you may have to look further.
The OP has a Girard on-demand WH, not a Suburban.

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Originally Posted by Evans View Post
I have a 2017 Jayco Greyhawk with an on-demand water heater that provides dangerous hot water temperatures. I have it set to 104 and it’ll run up to 120F. It appeared to be intermittent so thinking it was varying water pressure at different parks, I put a pressure regulator on. Still intermittent. Any ideas?
Are those numbers from the inside thermostat display? If not, it could be your outlet temp probe.

If you truly believe it is a pressure issue, fill your tank and try it with the pump.
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Old 09-16-2020, 01:21 PM   #4
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Thank you sir. I have a Girard on-demand water heater (I believe). Youíve put me in a direction Iíll pursue (thermostat replacement). Iíll look for ďhow to instructionsĒ for a Girard. Thanks again.
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Old 09-16-2020, 01:24 PM   #5
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Originally Posted by madmaxmutt View Post
The OP has a Girard on-demand WH, now a Suburban.



Are those numbers from the inside thermostat display?

If you truly believe it is a pressure issue, fill your tank and try it with the pump.
The temperature numbers are from a small panel near the bathroom sink. It’s at this panel where I can set the desired temperature.
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Old 09-16-2020, 02:03 PM   #6
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The temperature numbers are from a small panel near the bathroom sink. Itís at this panel where I can set the desired temperature.
That should mean the outlet temp probe is working, then. Try the tank/pump test and see if it results in the same temp variances.
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Old 09-16-2020, 02:04 PM   #7
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Bad thermostat or not affixed to the tank wall
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Old 09-16-2020, 02:10 PM   #8
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That should mean the outlet temp probe is working, then. Try the tank/pump test and see if it results in the same temp variances.
Thanks you sir. I’m not sure what a tank/pump test is (I know I don’t have a tank).
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Old 09-16-2020, 02:13 PM   #9
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Thanks you sir. I’m not sure what a tank/pump test is (I know I don’t have a tank).

Fill your fresh water tank and use the pump to verify whether it is a flow issue.

You can also call or message Girard tech support here.
https://girardgroupcompanies.com/con...hnical-support

For reference, the manual starts out with this pre-supposed statement about water flow.
"The RV’s cold water system deriving its water input from a pressurized (45 psi or greater) source such as a shore connection or an RV water pump connected to the RV’s fresh water storage tank. NOTE - A steady water low (no pulsating) will ensure a consistent temperature and performance."
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Old 09-16-2020, 02:45 PM   #10
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Got it. Iíll give it a shot and let you know. Thanks sir.
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Old 09-16-2020, 04:04 PM   #11
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I replaced that water heater in my 2017 Greyhawk with a tank model for the opposite reason - very poor hot water. I hated that thing. It wasted so much water trying to get the water to heat up. We dry camp mostly are have to be water and tank conscious.

I have attached the manual for the unit. Don't know if it will help or not.
Attached Files
File Type: pdf Girard Tankless Water Heater.pdf (4.69 MB, 0 views)
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Old 09-16-2020, 07:54 PM   #12
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Thanks JimD. I typically do not dry camp and when it works its sweet! I’d like to get it to consistently work if possible.
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