Rinnai propane water heaters

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OldHilux

New member
Joined
Oct 24, 2021
Posts
3
Location
Wyoming
Rinnai states on their website that their tankless water heaters are not for use in an RV. I cannot figure out why. Is it because of CO leaks in the exhaust? Surely that would be unacceptable in a residential unit as well. Is it because they use up room oxygen? If that is true, why don't the direct vent models work for RV usage?

I am stumped. I hate hearing rules without any reason given for them, maybe someone who knows more can chime in?

Alternatively, did anyone here try to use one of these in an RV? What went wrong?
 

Rene T

Site Team
Joined
May 20, 2011
Posts
18,418
Location
Farmington NH
I have one in my house. The exhaust pipe is white pvc and if I remember right, it’s a pipe within a pipe. The combustion air is drawn in through the big pipe and the exhaust goes out the inner small pipe. The outside pipe never gets even warm.
Maybe it’s because the pressure regulator is not big enough to supply the needed propane. The regulator I have is about 6” diameter and takes care of my clothes dryer, gas cooking stove and the Rinnai.
 

TonyL

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Joined
Dec 10, 2017
Posts
569
Location
UK
I think you will find that they are more concerned about vibration whilst the RV is moving. If your RV is static, see if they recommend them for park/residential park homes. Whilst they are running, they do require quite a high throughput of propane, but well within what an RV regulator should cope with. My question would be, why a Rinnai? We have them here, and I have to say that within the industry, they are not well liked.
 

OldHilux

New member
Joined
Oct 24, 2021
Posts
3
Location
Wyoming
Mostly because I like their wall furnaces. I don't know the gas tankless water heater market well though. What brands would you suggest instead?
 

TonyL

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Joined
Dec 10, 2017
Posts
569
Location
UK
I don't know if the make is available in the US, but Ariston do make a water heater, and as they make domestic boilers as well there is a decent backup service.
 
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