Journey with Confidence RV GPS App RV Trip Planner RV LIFE Campground Reviews RV Maintenance Take a Speed Test Free 7 Day Trial ×


Reply
 
Thread Tools Display Modes
Old 01-07-2021, 02:55 AM   #1
Junior Member
 
Join Date: Jan 2021
Posts: 4
dual thermostats

i was wondering if anyone could tell me if i can run 2 thermostats on a girarde tankless water heater. i just bought the new unit and it came with one which i didnt think it did. I ordered one so now i have 2. thought about putting one in the kitchen for really hot water and i can put one in the shower area so i can change the temp while in the shower. From what i have read you need to change the temp by the thermostat and not by adding cold water. Please Help
triggamike is offline   Reply With Quote
Old 01-07-2021, 10:21 AM   #2
Senior Member
 
Witch Doctor's Avatar
 
Join Date: Feb 2012
Location: Clarksville Va.
Posts: 10,422
I would think that you would need to add a relay, no system will allow two stats to work at the same time. You would need to lock one out, they both canít work at the same time.
__________________
Coachmen M/H
Concord
2018 / 300 DSC

Witch Doctor is offline   Reply With Quote
Old 01-07-2021, 11:56 AM   #3
Junior Member
 
Join Date: Jan 2021
Posts: 4
Thanks for replying back. I understand you cant run both at same time. My thoughts are will it hurt to have 2 control panels hooked up to the unit. My idea is one in the kitchen for hotter water and one in the bathroom for the shower. I can mount mine in the bath so you can open the door and adjust temp because what i have read you cant add cold to adjust so i can just turn up the adjustment. And the kitchen control would be off. As long as one of them is turned off would that work?
triggamike is offline   Reply With Quote
Old 01-07-2021, 12:03 PM   #4
Senior Member
 
Retired JSO's Avatar
 
Join Date: Feb 2016
Location: NE Florida
Posts: 915
Why would you need 2 water heater temps? You would still adjust the outflow temp with the single or dual handle faucets just like at home.
Retired JSO is offline   Reply With Quote
Old 01-07-2021, 12:49 PM   #5
Junior Member
 
Join Date: Jan 2021
Posts: 4
You cant add cold water to adjust temp. you have to set the temp on the control panel.
triggamike is offline   Reply With Quote
Old 01-07-2021, 01:04 PM   #6
Senior Member
 
Witch Doctor's Avatar
 
Join Date: Feb 2012
Location: Clarksville Va.
Posts: 10,422
I canít say without seeing a wire diagram, you need power to the stat correct? I assume 12 volt. You canít do it If it runs that way you have to isolate the stats you do that with a relay such as a single pull double throw, take a picture of the wire diagram and post it. You need to be able to switch power to the stat independently
Witch Doctor is offline   Reply With Quote
Old 01-07-2021, 01:17 PM   #7
Junior Member
 
Join Date: Jan 2021
Posts: 4
Thanks for the help. I know what i need to do now. I was worried about the computer board have 2 control panels but with a relay i can set them up independent. Awesome thanks for you help.
triggamike is offline   Reply With Quote
Old 01-07-2021, 01:27 PM   #8
Senior Member
 
Witch Doctor's Avatar
 
Join Date: Feb 2012
Location: Clarksville Va.
Posts: 10,422
Your welcome it’s pretty easy to do but they do have to be isolated. We use to call them peanut relays, you can find one on the Grainger site.
__________________
Coachmen M/H
Concord
2018 / 300 DSC

Witch Doctor is offline   Reply With Quote
Old 01-07-2021, 03:23 PM   #9
Always Learning
 
ependydad's Avatar
 
Join Date: Nov 2011
Location: Four Corners, FL
Posts: 21,410
Quote:
Originally Posted by triggamike View Post
You cant add cold water to adjust temp. you have to set the temp on the control panel.
Have you tried it?

My family of 4 all prefer different water temperatures. I can't imagine having to adjust the water heater when someone goes to get into the shower. Much less expecting my 8 year old to do it before he heads in.
__________________
Officially a SOB with a 2022 Jayco Precept 36C
Checkout my site for RVing tips, tricks, and info | Was a Fulltime Family for 5 years, now we're part-timing on long trips
ependydad is offline   Reply With Quote
Old 01-07-2021, 09:32 PM   #10
Senior Member
 
Retired JSO's Avatar
 
Join Date: Feb 2016
Location: NE Florida
Posts: 915
Demand and regular water heater work the same way as to temp. Tank water heater and demand heater should be set at 120 degrees. 120 degree water flows on the hot line to the mixer, faucet. Cold is added to make warm/hot/cold. This is not rocket science.
Retired JSO is offline   Reply With Quote
Old 01-07-2021, 10:23 PM   #11
Senior Member
 
NMWildcat's Avatar
 
Join Date: Jun 2012
Location: Southern NM
Posts: 7,968
Quote:
Originally Posted by Retired JSO View Post
Demand and regular water heater work the same way as to temp. Tank water heater and demand heater should be set at 120 degrees. 120 degree water flows on the hot line to the mixer, faucet. Cold is added to make warm/hot/cold. This is not rocket science.
Nope, not rocket science, but your description of how on demand water heaters work is not even close.
__________________
Scott and Liz - Southern NM
2012 Wildcat Sterling 32RL - w/level up (best option ever)
2007 Chevy 2500HD 4dr short bed Duramax w/allison
Reese Fifth Airborne air ride king pin coupler with Sidewinder
NMWildcat is offline   Reply With Quote
Old 01-07-2021, 10:27 PM   #12
Senior Member
 
Retired JSO's Avatar
 
Join Date: Feb 2016
Location: NE Florida
Posts: 915
dual thermostats

I have one set at 120 degrees. Hot water valve turned on, hot water, add cold have warm. Simple
Retired JSO is offline   Reply With Quote
Old 01-08-2021, 08:14 AM   #13
Senior Member
 
NMWildcat's Avatar
 
Join Date: Jun 2012
Location: Southern NM
Posts: 7,968
Quote:
Originally Posted by Retired JSO View Post
I have one set at 120 degrees. Hot water valve turned on, hot water, add cold have warm. Simple
I also have one. Doesn't work that way at all. They are not all the same.....
__________________
Scott and Liz - Southern NM
2012 Wildcat Sterling 32RL - w/level up (best option ever)
2007 Chevy 2500HD 4dr short bed Duramax w/allison
Reese Fifth Airborne air ride king pin coupler with Sidewinder
NMWildcat is offline   Reply With Quote
Old 01-08-2021, 12:39 PM   #14
Always Learning
 
ependydad's Avatar
 
Join Date: Nov 2011
Location: Four Corners, FL
Posts: 21,410
Quote:
Originally Posted by NMWildcat View Post
I also have one. Doesn't work that way at all. They are not all the same.....
Can you really not have anything but full hot?

I'm completely dumbfounded by this...
__________________
Officially a SOB with a 2022 Jayco Precept 36C
Checkout my site for RVing tips, tricks, and info | Was a Fulltime Family for 5 years, now we're part-timing on long trips
ependydad is offline   Reply With Quote
Old 01-08-2021, 01:21 PM   #15
Senior Member
 
NMWildcat's Avatar
 
Join Date: Jun 2012
Location: Southern NM
Posts: 7,968
Quote:
Originally Posted by ependydad View Post
Can you really not have anything but full hot?

I'm completely dumbfounded by this...
I have two control settings, one for low (27k btu) or auto, which is either 27k btu or 34k btu.
To more finely control temp, you adjust the flow rate with the hot water valve. More flow (full open) is cooler, less flow is warmer. For these type, if you introduce cold water, the temp becomes sporadic. The newer models have much better adjustment features. The next on demand I will have is the newer Truma.
__________________
Scott and Liz - Southern NM
2012 Wildcat Sterling 32RL - w/level up (best option ever)
2007 Chevy 2500HD 4dr short bed Duramax w/allison
Reese Fifth Airborne air ride king pin coupler with Sidewinder
NMWildcat is offline   Reply With Quote
Reply

Tags
thermostat

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


» Featured Campgrounds

Reviews provided by

Disclaimer:

This website is not affiliated with or endorsed by Forest River, Inc. or any of its affiliates. This is an independent, unofficial site.



All times are GMT -5. The time now is 07:45 PM.