Good Sam Club Open Roads Forum: On demand water heater issue
Open Roads Forum Already a member? Login here.   If not, Register Today!  |  Help

Newest  |  Active  |  Popular  |  RVing FAQ Forum Rules  |  Forum Posting Help and Support  |  Contact  

Search:   Advanced Search

Search only in Do It Yourself Modifications a...

Open Roads Forum  >  Do It Yourself Modifications and Upgrades (DIY)

 > On demand water heater issue

Reply to Topic  |  Subscribe  |  Print Topic  |  Post New Topic  | 
TNGW1500SE

Oliver Springs TN

Senior Member

Joined: 07/15/2012

View Profile


Offline
Posted: 02/22/22 08:50am Link  |  Quote  |  Print  |  Notify Moderator

I bought on of those outdoor water heaters that has two knobs on the front. One for how hot the burner burns and the other for water flow. It's designed to have a water hose hooked to it and the shower wand hooks to the outlet but I installed it so that the outlet runs to a shower faucet. It works great until I turn on some cold water to mix with the hot. That shuts the burner off. I think the pressure equalizes between the hot and cold on the unit so it shuts off. Anybody got a fix? It still will work but I have to set the temp on the unit so when I shower, I'll only open the hot side of the shower valve.

Here's what I have: HEATER LINK

* This post was edited 02/22/22 09:07am by TNGW1500SE *

mobeewan

Hampton, Va

Senior Member

Joined: 01/03/2007

View Profile



Posted: 02/22/22 09:29pm Link  |  Quote  |  Print  |  Notify Moderator

It's not designed to work that way. Under normal operation as designed to work, you set the burner and water flow using the knobs on the water heater to get the water temp to the shower head at the temp you want. If you turn down the flow of water using the water heater knob, the temperature will increase since the burner is still working at the same rate. At a certain temp the temp safety valve will kick in to shut off the burner to keep you from getting scalded.

The way you hooked it up causes the flow to the water heater to drop off. With the burner still operating at the same gas flow to the burner, water coming into the water heater starts to becomed super heated to a higher temperature and the temperature safety valve kicks in and stops the flow of gas to the burner. The water heater is still measuring the temperature of the water being output by the water heater to the hot side of the shower valve. It doesn't know that you have cold water coming in on the cold water side of the shower valve to cool the water back down. You're trying to use your shower heater like a regular water heater with a tank full of hot water.

The only safe "fix" is to replace your shower heater with a regular on demand heater made for a travel trailer. The dangerous fix is to override or remove the temperature cut off valve, but you very well may melt down and set the water heater and anything else around it on fire.

I have one of the water heaters like you have and mounted it to a piece of plywood that I could prop up against something or bungee to a tree. I use it when tent camping and used it at home to wash the dog outside. I may mount it inside a cargo trailer to camper conversion I am getting ready to build. The outlet will have a tee going to the kitchenette sink and to the shower hose with it's own shut off valve.

* This post was last edited 02/22/22 09:53pm by mobeewan *   View edit history

TNGW1500SE

Oliver Springs TN

Senior Member

Joined: 07/15/2012

View Profile


Offline
Posted: 02/25/22 07:33am Link  |  Quote  |  Print  |  Notify Moderator

I think I'll just set the temp and only use the hot knob in the shower.

* This post was edited 02/25/22 08:59am by an administrator/moderator *

Reply to Topic  |  Subscribe  |  Print Topic  |  Post New Topic  | 

Open Roads Forum  >  Do It Yourself Modifications and Upgrades (DIY)

 > On demand water heater issue
Search:   Advanced Search

Search only in Do It Yourself Modifications a...


New posts No new posts
Closed, new posts Closed, no new posts
Moved, new posts Moved, no new posts

Adjust text size:




© 2022 CWI, Inc. © 2022 Good Sam Enterprises, LLC. All Rights Reserved.