Yes, there is a reducer. The short pipe that goes down into the passenger side head at the rear top has a smaller diameter (orifice) inside of it which controls the amount of hot coolant that goes back to the hot water heater.

Some have found out that things get really hot back there when they discard that small pipe.

Emery Stora

On Aug 18, 2014, at 3:58 PM, Jared wrote:

> Even the high temp orange PEX tubing isn't rated for temps that high, 180 is the limit.
>
> I am thinking that copper would be a really good choice all though you are likely to lose some BTUs on the way to the heater, long run and lots of
> cooling air.
>
> I am not certain if there is some type of reducer that controls the flow to the heater as well. If there is no reducer I bet copper just might work. I
> have considered the same thing, and copper is at the top of my list, followed by aluminum.
>
> Jared
> --
> Jared & Tina Lazaron + 7yr old Daughter.
>
> 77 Eleganza II "Recherché" Winterfeldt 455, Holley ProJection, Doug Thorley Headers, 3in exhaust, Switch Pitch, Alcoas, ONAN 6.5 Emerald series, CMC
> Restoration
>
> GO SEAHAWKS!!
>
> Arlington, WA 98223
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It's a pressure relief, not a temperature relief.

On Aug 18, 2014 5:48 PM, "Jared" wrote:
At what temperature does the relief valve pop on our factory 6 gallon
heater?
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bdub wrote on Mon, 18 August 2014 16:22

It's a pressure relief, not a temperature relief.
On Aug 18, 2014 5:48 PM, "Jared" wrote:
At what temperature does the relief valve pop on our factory 6 gallon heater?

That is true but with increased temperature comes increased pressure. I didn't say what I meant originally. At what pressure do our relief valves go pop?

Jared

bdub wrote on Mon, 18 August 2014 16:22

It's a pressure relief, not a temperature relief.
On Aug 18, 2014 5:48 PM, "Jared" wrote:
At what temperature does the relief valve pop on our factory 6 gallon heater?

That is true but with increased temperature comes increased pressure. I didn't say what I meant originally. At what pressure do our relief valves go pop?

Jared

lotsofspareparts wrote on Mon, 18 August 2014 19:39

bdub wrote on Mon, 18 August 2014 16:22

It's a pressure relief, not a temperature relief.
On Aug 18, 2014 5:48 PM, "Jared" wrote:
At what temperature does the relief valve pop on our factory 6 gallon heater?

That is true but with increased temperature comes increased pressure. I didn't say what I meant originally. At what pressure do our relief valves go pop?

Jared

Its called a temperature AND pressure relief valve. The residential ones open at 150 PSI OR 210F. I would expect the RV stuff to be the same.

Yes, there is a reducer. The short pipe that goes down into the passenger side head at the rear top has a smaller diameter (orifice) inside of it which controls the amount of hot coolant that goes back to the hot water heater.

Some have found out that things get really hot back there when they discard that small pipe.

Emery Stora

It's a pressure relief, not a temperature relief.

On Aug 18, 2014 5:48 PM, "Jared" wrote:


That is true but with increased temperature comes increased pressure. I didn't say what I meant originally. At what pressure do our relief valves go pop?

Jared