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General Discussion of preventative/corrective maintenance and other technical issues regarding your coach that are not covered in other Mechanic's Corner categories (ex. refrigerators, water heaters, and compressors).

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  #1  
Old 11-28-2019
GregOC GregOC is offline
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Default HotWater Shower Hack

I pulled 05 gold fixtures out of the Bath area and while I was at the task of changing out the shower mixer I added a hot water circulation valve. The concept is simple. I used a PEX tee below the hot pipe inlet to the Mixer and installed a self closing spring valve. I got the vale on Amazon for $35.00 EZ-FLO 10187LF Self-Closing Stop Valve, Chrome . I attached a couple of images. The red pipe is what I added. that pipe exits to send the water back to the fresh water tank. If you are on city water the fresh water tank may over fill at the very most as I calculated that the process moves a bit more than 1/2 gallon of water to displace the line and another quart to half gallon to heat the line and recover the loss.
A couple of notes.
**The white pipe in the rig is a bit thinner than 1\2 inch pex pipe. the sleeve fit the od but the plastic is thinner and the id is a bit larger. I crimp the pipe like normal then I insert a thin gauge die in the tool to make the band press a bit tighter. the die hack is simply a 26ga piece of tin half the circumstance of a band
**I returned the water to the tank fill line between the sporlan and the tank fill inlet. I was going to return the water to the pickup line to the 12v pump but did not want it to be in the way if a emergency pump replacement happened.
**when cold , holding the valve open to a count of 13 brings water up, count of 18 makes the valve warm. the valve spring is firm, some long arm shower valves may suit better
**I removed the closet behind my toilet several months ago and installed a genset air inlet. your bath may be different.


I need to correct some water hammer issue because the water heater tank blow off burps a bit when the spring loaded chrome valve is allowed to shut down on its own. for the time being on this trip I release it slow. the result could be damaging.
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Old 11-28-2019
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Randy Dupree Randy Dupree is offline
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The back side of the shower is accessible?
Thats the first Bird i have seen where thats possible.
Thanks Greg.
No pics of the genny air intake?
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Old 11-28-2019
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Clever, Thanks for the idea
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Old 11-28-2019
GregOC GregOC is offline
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The shower stall is diagonal like the 94 pt refer with the extra space used as a cabinet. I guess it doesn't matter if the valve is outside of the shower as long as the connection is close to the mixer. The first reason I removed the cabinet was to push the dometic toilet retrofit back 6 inches as it is longer than the air operated toilet I removed. The air intake is 8 inch with a vortox ram scoop on the roof. I need to do some more work on the airbox to get a better filter access setup.
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Old 11-29-2019
DW SD DW SD is offline
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Cool. Did the same with a 12V normally open solenoid and timed relay.
Instant hot water is nice.
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  #6  
Old 11-29-2019
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Default Quick Hot Modification

Quote:
Originally Posted by GregOC View Post
I pulled 05 gold fixtures out of the Bath area and while I was at the task of changing out the shower mixer I added a hot water circulation valve. The concept is simple...
You’re going to like saving that unnecessary tankage waste. Simple concept but on most coaches easy behind-the-shower access is non-existent. There is a valve and color changing pipe system one can buy that does what yours does. Have seen it as an option on some newer coaches. However on both, getting quicker hot water at the shower requires manipulating that shower valve. It likely helps at the lavatory faucet but there’s still some waste. The QuickHot mod Doug and I installed also uses pressure from the existing water pump. But it is completely automatic after pushing a button and works for both faucets. Find details for a couple pages starting at post #40 here: https://www.wanderlodgeownersgroup.c...t=27175&page=4.

I installed a separate 6 gal electric hot water heater that acts as an accumulator to smooth out water flow. Am sure it helps eliminate water hammer as well.
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Old 12-04-2019
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Cavemen! Filling your water tank with hot water sounds bad to me. It's probably not a big issue until the tank level gets low and you are giving all the nasties a chance to grow.
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Old 12-04-2019
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Quote:
Originally Posted by badandy View Post
Cavemen! Filling your water tank with hot water sounds bad to me. It's probably not a big issue until the tank level gets low and you are giving all the nasties a chance to grow.
Your right on track there Andy. Moisture and heat equals all kinds of "nasties" Not something I would want
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Old 12-04-2019
DW SD DW SD is offline
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Your right on track there Andy. Moisture and heat equals all kinds of "nasties" Not something I would want
Shall we all invest in purification systems next??
We could even go to a one-tank only format. Clean water, gray water, et al. Clean it up in real time and send it back out
Imagine, no more dumping, no more filling... 100% sustainability
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Old 12-04-2019
badandy badandy is offline
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Quote:
Originally Posted by DW SD View Post
Shall we all invest in purification systems next??
We could even go to a one-tank only format. Clean water, gray water, et al. Clean it up in real time and send it back out
Imagine, no more dumping, no more filling... 100% sustainability
The right way to do it is to install a check valve and a circulation pump along with the return line. The circulation pump will move water around in a circle through the water heater, out to the fixtures, and then right back to the inlet of the water heater. This way no warm/hot water ever makes it back to the tank. The hardest part is usually running that water line back to the tank, so just put a pump and check valve in there and call it good.
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