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Old 04-01-2019, 10:56 AM   #1
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Shower Water Miser Letting Air into Water Lines

Someone in a Facebook group had an issue with air getting into the water filter housing and not allowing the water system to pressurize. The FR Tech Dept said the shower miser could have a bad seal and let air into the lines. I was under the impression the water miser put the rerouted water back into the fresh tank but the diagram shows otherwise.
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Old 04-01-2019, 11:05 AM   #2
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Don't get that. The whole purpose of the thing is to re-direct water from the hot water line back into the fresh tank until the water gets hot enough to use.
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Old 04-01-2019, 11:10 AM   #3
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Quote:
Originally Posted by aguyandhiscomputer View Post
Someone in a Facebook group had an issue with air getting into the water filter housing and not allowing the water system to pressurize. The FR Tech Dept said the shower miser could have a bad seal and let air into the lines. I was under the impression the water miser put the rerouted water back into the fresh tank but the diagram shows otherwise.
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Don't get that. The whole purpose of the thing is to re-direct water from the hot water line back into the fresh tank until the water gets hot enough to use.
Back to the fresh tank or back to the fresh tank suction line is the same thing.
Regardless, the pump is using recirculated water and not wasting fresh water by dumping it down the shower drain until the water gets hot.

The only thing putting water back into the suction line brings (vs pumping water into the tank) is the 'possibility' of having a place for an air leak on the suction side of the pump. (as mentioned)

EDIT: So, the next question is going to be... "why not just pump it back to the tank?"

Because fresh tanks can (and often are) far away from the pump and the shower.
It simply makes more sense to use short plumbing lines from the shower to the pump than all the way to the tank.

On my current 5th wheel, the fresh tank is 30' from the pump and the shower.
My pump is directly under the shower in the basement. It would take about 4' of hose vs 30' to install a shower miser in my rig.
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Old 04-01-2019, 11:21 AM   #4
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Don't get that. The whole purpose of the thing is to re-direct water from the hot water line back into the fresh tank until the water gets hot enough to use.
It's definitely a better way to get the already hot water back into the lines instead of it pouring into the fresh tank where it has to be reheated but the way it is routed it adds complexity and adds another seal that can leak and add air to the system so it won't pressurize.
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Old 04-01-2019, 07:05 PM   #5
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Well, it's good to be aware of this in case I start having any issues. I have the shower mizer installed from factory.
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Old 04-29-2019, 03:21 PM   #6
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Quote:
Originally Posted by aguyandhiscomputer View Post
Someone in a Facebook group had an issue with air getting into the water filter housing and not allowing the water system to pressurize. The FR Tech Dept said the shower miser could have a bad seal and let air into the lines. I was under the impression the water miser put the rerouted water back into the fresh tank but the diagram shows otherwise.
Where did you find that diagram? I'd like to see a higher resolution copy of it.
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Old 05-02-2019, 04:31 PM   #7
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Sorry to hijack the thread, but I'm curious about the water miser diagram and trying to match it to my plumbing.

My shower miser return does not go back to the line from the fresh water tank to the pump (as shown in the diagram). Mine loops back to the line coming off the backend of the water pump.

Should/could the shower miser return hose be under pressure? I ask because the small pipe that comes off the shower miser valve developed a split and a fast dripping leak. Fortunate that it was in that spot and just drained down the tub...and filled my grey tank sooner than normal. And this was while the valve was directed to the shower head...not the return hose, so the return hose was under pressure.

If the miser return shouldn't be under pressure when not in use, maybe I have a bad one-way value at the loop connection after the water pump. Or maybe it's not a one-way valve at all.

Looks like the little pipe is a custom part (not from the the ShowerMiser kit), so I'll need to call the dealer or FR for a replacement. In the meantime, I'll cap off the return line at the shower faucet.
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Old 05-02-2019, 06:51 PM   #8
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Shower Miser return line should not be under pressure. It should go back to either the water tank or at least the suction side of the pump.
The only time it should fill your fresh tank is when the miser valve is engaged. In fact, I sometimes use it to fill my fresh tank when at hookups before leaving a CG.
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