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09-16-2020, 12:37 PM
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#1
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Junior Member
Join Date: Oct 2016
Location: Colorado Springs
Posts: 10
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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 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?
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09-16-2020, 12:56 PM
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#2
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Senior Member
Join Date: Jul 2016
Location: Mapleton
Posts: 4,379
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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.
__________________
2017 SLX 195RB
2021 Jeep Grand Cherokee Summit L 5.7L V8
Andersen WDH hitch, Renogy 100 AH Lithium &
200 Watts solar panels from Renogy
Prev. '14 Jeep Grand Cherokee Overland, gas 3.6 V6
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09-16-2020, 01:20 PM
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#3
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Senior Member
Join Date: Oct 2018
Location: Colorado Springs
Posts: 1,270
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Quote:
Originally Posted by RogerR
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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The OP has a Girard on-demand WH, not a Suburban.
Quote:
Originally Posted by Evans
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?
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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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09-16-2020, 01:21 PM
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#4
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Junior Member
Join Date: Oct 2016
Location: Colorado Springs
Posts: 10
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Thank you sir. I have a Girard on-demand water heater (I believe). You’ve put me in a direction I’ll pursue (thermostat replacement). I’ll look for “how to instructions” for a Girard. Thanks again.
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09-16-2020, 01:24 PM
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#5
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Junior Member
Join Date: Oct 2016
Location: Colorado Springs
Posts: 10
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Quote:
Originally Posted by madmaxmutt
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.
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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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09-16-2020, 02:03 PM
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#6
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Senior Member
Join Date: Oct 2018
Location: Colorado Springs
Posts: 1,270
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Quote:
Originally Posted by Evans
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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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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09-16-2020, 02:04 PM
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#7
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Senior Member
Join Date: Aug 2018
Location: Prescott Valley, AZ
Posts: 637
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Bad thermostat or not affixed to the tank wall
__________________
Cliff and Annette
2019 Jayco 315RLTS Northpoint
Travelling with 2 Macaws, a cat, and 2 standard poodles.
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09-16-2020, 02:10 PM
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#8
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Junior Member
Join Date: Oct 2016
Location: Colorado Springs
Posts: 10
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Quote:
Originally Posted by madmaxmutt
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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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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09-16-2020, 02:13 PM
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#9
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Senior Member
Join Date: Oct 2018
Location: Colorado Springs
Posts: 1,270
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Quote:
Originally Posted by Evans
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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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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09-16-2020, 02:45 PM
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#10
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Junior Member
Join Date: Oct 2016
Location: Colorado Springs
Posts: 10
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Got it. I’ll give it a shot and let you know. Thanks sir.
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09-16-2020, 04:04 PM
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#11
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Senior Member
Join Date: Apr 2017
Location: Inland Empire, California
Posts: 2,007
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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.
__________________
Jim
Retired electronic technician (45 years in the field)
2017 Greyhawk 29W (solar & many other mods)
wife (maybe I should have given her top billing)
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09-16-2020, 07:54 PM
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#12
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Junior Member
Join Date: Oct 2016
Location: Colorado Springs
Posts: 10
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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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