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Old 06-07-2017, 03:56 PM   #1
3 Rivet Member
 
Colfax , California
Join Date: Mar 2016
Posts: 205
Max incoming psi for Truma Combi water heater

I'm wondering how many folks have read up on the Truma Combi disclaimer regarding incoming city water pressure.

Despite the reality of domestic water supplies in the US frequently exceeding 50-60 psi and that most aftermarket RV pressure regulators reduce to the RV industry "standard" of 50 psi, the Truma manual is very specific in stating that the maximum expected incoming psi should be no more than 40.6 psi. In fact, Truma states that they will not cover damage traceable to water pressure exceeding 40.6 psi.

Anyone tested their home or RV park pressure lately?
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Old 06-08-2017, 07:08 PM   #2
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2017 Basecamp
SoCal , California
Join Date: Mar 2017
Posts: 18
I noticed that in the manual for the Truma as well. The Basecamp has a pressure regulator that does not reduce it to that level, the regulator reduces the city water to around 50 psi, according to the manual. Unless there is another undocumented regulator to the Truma, it would seem it is too high.

More info here:
http://www.airforums.com/forums/f404...-163299-3.html
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Old 06-08-2017, 11:24 PM   #3
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Colfax , California
Join Date: Mar 2016
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I received a return call from Truma today; unfortunately, it went to voice mail.

Gist of the message was that there is a regulator going into the Truma. It wasn't clear whether she was referring to the AS installed regulator which I understand goes to 50 psi or another Truma installed regulator. In any case, if there is a regulator that goes to <40.6 psi, it is thus far undocumented.

I will call her back tomorrow and finish this up by reporting on the discussion.
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Old 06-09-2017, 10:16 AM   #4
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Colfax , California
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Posts: 205
Nothing is simple

I called Truma back today. They indicated that there is a pressure regulator in the cold water line that is part of the Truma package. They said that it regulated between 40 and 50 psi.

I pointed out that the Truma manual disclaims warranty coverage for unit failure caused by incoming water pressure that exceeds the 40.6 psi limit. Their response was that, since the regulator was supplied with the Truma unit, that the warranty would honor damage due to excessive water pressure.

There are a couple of issues associated with this response that are a bit troubling. First, the warranty is time specific and failure due to excessive water pressure, even if caused by the regulator delivering water to the appliance at 50 psi after the term if the warranty, will be the responsibility of the owner. The other issue is the reality that pressure regulators fail to deliver at the rated specification at a high rate out of the box and, even if they start out on spec., they often lose that performance over time.

Though I am aware that this unit has been used sucessfully in Europe for some years, my experience traveling in Europe suggests to me that high water pressure in domestic water delivery systems is not a rampant problem.

If the 40.6 psi limit is real, then the protection offered by the Truma supplied regulator is suspect, in my mind, because of the potential 10 psi excess allowed by the Truma supplied regulator. It is certainly possible that the Combi could function as expected during the term of the warranty, but fail due to excess pressure allowed by the regulator limit variability post warranty. Then again, regulators lose their rated specification over time with some consistency.

None of this would be troubling for the vast majority of RV water systems that are designed in the US to operate at 50-60 psi, but the Combi has an upper psi limit that was apparently significant enough to point out in the Truma manual with a warranty disclaimer.

Providing a regulator that exceeds that 40.6 psi limit is a bit troubling, in my view. It might be a slowly ticking time bomb that only goes off after the warranty expires.
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