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Old 04-18-2024, 06:43 PM   #1
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On demand water heater

My dealer told me not to use a pressure regulator because on demand heaters need the pressure to operate correctly so I bring home my new camper and hook up to city water and bingo leaks at almost every crimp on the pecks lines. Bought an adjustable water pressure regulator and my home has 70psi. Seems pretty high for a camper.what is the max psi for campers with on demand heaters?
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Old 04-18-2024, 07:04 PM   #2
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Personally I would set an adjustable between 40 and 55 psi.

I have an on demand at home, our city water pressure usually never tops 35psi, and it works fine.
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Old 04-19-2024, 12:13 AM   #3
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My Alante book says 55PSI maximum. With on demand water heaters, set your water temp to what you like and run straight hot water. I would start at around 110F and adjust accordingly. When you find your temp, set it to that temp when you take a shower. Everybody needs to find their temp. This keeps your flow high enough to keep it running.
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Old 04-19-2024, 04:36 AM   #4
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That’s a good idea for setting the temp. I don’t know why my dealer told me that but I should have known better, even google says max 60 for the fittings and fixtures. Thanks for the advice
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Old 04-19-2024, 05:19 AM   #5
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We are at Creekfire RV park in Savannah, and have had issues regulating the water temp. Typically, as others mentioned, I run the hot water wide open, and regulate temps with the cold water. I think It may be the water pressure here, will check the pressure regulator in a bit. One thing we found out quickly, again as others have mentioned here, that water pressure plays a big part on how these tankless heaters work.
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Old 04-24-2024, 10:35 PM   #6
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On our second trip we couldn't get the tankless to work properly. In hindsight it was probably because I only opened the spigot two turns, so not enough flow/pressure for the sensor to light the burner.

Went to Cassini Ranch this past weekend and I think I finally found the sweet spot.


We use a regulator that tops out at 40psi. Opened the spigot all the way and, like mentioned above, and by "The RV Tech" only use the hot water knob and adjust the temp on the panel. Once I figured that out, it was gravy.

One issue they have is they're usually last in line on the propane loop. Running the stove or furnace for a minute or two after setup ensures the system is pressurized with gas and all air pockets have been purged.

Another is, as mentioned, running the cold water, using it to regulate the temperature interrupts/decreases the flow of water through the tankless, dropping the pressure and causing the burner to go out.

Both of these issues will cause an E1 error on the panel.

If you're in the shower or running the sink faucet, just hit the temp up/down button and wait a sec for the water to come back up to temp.


Had a nice long, hot shower on check out day.
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Old 04-25-2024, 03:41 AM   #7
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Quote:
Originally Posted by jetlag View Post
We are at Creekfire RV park in Savannah, and have had issues regulating the water temp. Typically, as others mentioned, I run the hot water wide open, and regulate temps with the cold water. I think It may be the water pressure here, will check the pressure regulator in a bit. One thing we found out quickly, again as others have mentioned here, that water pressure plays a big part on how these tankless heaters work.

Update- I have a new regulator that I had not adjusted before. With it adjusted to as high a flow it would allow here, I now have 45 psi and good hot water
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