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Old 06-17-2024, 02:52 PM   #1
2 Rivet Member
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Lewisburg , West Virginia
Join Date: Jul 2021
Posts: 51
27fbq Tankless Water heater woes...

I have searched the forums, and couldn't find an immediate fix. But. Our first trip we had really good water pressure (ruptured an old water hose!) and had great water pressure and hot water at the kitchen sink and shower.

We went to a state park last weekend and sadly had no internet. But also low water pressure and only had hot water in the bathroom sink.

After getting home, and researching. Found possible solutions like turning on the hot water in the bathroom on a trickle. But it is rather frustrating.

So, what have YOU discovered as a solution to the problem?

Oh, and when I got home. Hooked up to my water at the house. Had good pressure and had hot water in the shower and kitchen sink. Then we stayed in the camper at home Sat night with the hose hooked up, and had not 100% success with hot water .
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Old 06-23-2024, 09:04 AM   #2
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2022 27' Globetrotter
Bethlehem , Pennsylvania
Join Date: Oct 2020
Posts: 387
Hi WVDude. Sounds like you're wrestling with a Girard on-demand water heater. I have the same unit and *really* dis-like it. We have found that the best way to use it is to set the water temperature to 102, then when you want warm water (shower or sink), run the hot water on full (no cold). If the flow rate through the water heater drops below 1 gallon per minute, then the water heater shuts off. This is an inherent issue with the Girard unit.

Also, be sure to NOT use a water pressure regulator. The Globetrotter has a regulator built in and you cannot run two of them and get good flow in the trailer. More is not better in this case.
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Old 06-23-2024, 01:27 PM   #3
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2018 25' Flying Cloud
Portland , Oregon
Join Date: Oct 2017
Posts: 1,375
When we have low water pressure from the park we turn on the pump as well. The pump will kick on if the pressure isn’t sufficient and the two water sources will mix.

When you have full hookups, the idea of turning on the sink partially is useful advice. When you don’t have hookups it will take some plumbing changes to dump water back into the fresh tank to avoid wasting that water. The showermiser is what some have resorted to. If you don’t care about the color shifting feature, you can make your own with commonly available plumbing parts.

These tankless water heaters sound great on the showroom floor but are definitely not a step forward over the tried and true 5gal water heaters in older RVs.
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Old 06-27-2024, 07:56 PM   #4
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2023 27' International
Jupiter , Florida
Join Date: Mar 2021
Posts: 40
We swapped out the Girard for a Truma and have been 100% happy. Pricey but worth it to us. AS should just use the Truma.
2023 F-250 CCSB 6.7
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Old 06-27-2024, 08:14 PM   #5
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2021 30' Flying Cloud
Airstream - Other
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Lady Lake , Florida
Join Date: Mar 2018
Posts: 1,235

Happiest day of our life watching our Girard leave our Airsteam in the back of the Truma service techs van.

The Truma has performed perfectly since day one and one year later still gives on demand hot water.

We installed the IRVWPC pump module trying to solve the Girard problems. And while it did not fix the Girard
it did solve noisy water pump and provided non pulsing water control even at a drip
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