Forum Discussion
- It's simple physics. Heat rises. If you have a column of water the hottest water will rise to the top. The same principle at work in your water heater. Ever wonder why the cold goes in the bottom and the hot comes out the top? And before somebody say the cold goes into the top of their heater, if it does there is a pipe internally going to the bottom.
A check valve is not going to help. Letting it trickle will help some. Pointing it at the wall when you turn it on will work every time you remember to do it. - AlwaysDreamingExplorerAfter some more research, this you tube video explains, experiments, and offers a simple cheap fix the best in my opinion.
https://www.youtube.com/watch?time_continue=4&v=BpnNZWdlcfc - ependydadExplorer
AlwaysDreaming wrote:
Could be interesting for guests. Do I tell them?
Funny story to that... my in-laws were with us. I remembered to warn my father-in-law but somehow forgot to warn my mother-in-law. :B
Maybe consider the ShowerMiser:
https://aquaviewinc.com/rv/ - Dutch_12078Explorer II
AlwaysDreaming wrote:
Dutch_12078 wrote:
I installed check valves on our shower feed lines to eliminate the backflow issues that cause the hot/cold blast when the shower head shutoff is used.
Thanks. Where did you install check valves? I assume it doesn't matter where you install them?
I installed them as close to the faucet inlets as possible. On my setup, there's only a couple of inches of PEX between the check valves and the faucets. I used SeaTech quick connect valves from Fresh Water Systems, but SharkBite, etc., likely have similar valves.
SeaTech Check Valve - 1/2 CTS - pauldubExplorerI bought a check valve to put in the water line but never did install it. I did install a shutoff valve at the shower head and that has totally cured the cold water blast problem. The problem is caused by the water dribbling from the shower head with the built in shutoff that doesn't fully shut off. Just add an inline shut off and all is good and it's easy to do. I bought the KES Shower Head Shut-Off Valve Brass with Metal Handle Polished Chrome K1140B3 from Amazon for about $12.
- AlwaysDreamingExplorer
pauldub wrote:
I bought a check valve to put in the water line but never did install it. I did install a shutoff valve at the shower head and that has totally cured the cold water blast problem. The problem is caused by the water dribbling from the shower head with the built in shutoff that doesn't fully shut off. Just add an inline shut off and all is good and it's easy to do. I bought the KES Shower Head Shut-Off Valve Brass with Metal Handle Polished Chrome K1140B3 from Amazon for about $12.
I have on K1140B3 on order and will try this first, by removing and replacing the dribble valve . If it works, I will return the check valves.
I don't understand why the dribble valve causes the problem, but if replacing it with a shut off works, I don't need to know.
Best Regards, Thanks - Dutch_12078Explorer II
AlwaysDreaming wrote:
pauldub wrote:
I bought a check valve to put in the water line but never did install it. I did install a shutoff valve at the shower head and that has totally cured the cold water blast problem. The problem is caused by the water dribbling from the shower head with the built in shutoff that doesn't fully shut off. Just add an inline shut off and all is good and it's easy to do. I bought the KES Shower Head Shut-Off Valve Brass with Metal Handle Polished Chrome K1140B3 from Amazon for about $12.
I have on K1140B3 on order and will try this first, by removing and replacing the dribble valve . If it works, I will return the check valves.
I don't understand why the dribble valve causes the problem, but if replacing it with a shut off works, I don't need to know.
Best Regards, Thanks
I have a shower head with a positive shutoff valve, and it doesn't stop the hot or cold blasts any better than the dribble valves. The blast is caused when the blocked water flow allows either the cold or hot line to back pressure the other line through the open mixer valves due to differences in the pipe runs. That's what causes the momentary blast when you open the shower head valve. Of course if you take too long soaping up, the water in the hose can cool a bit too, but that's usually not enough to be a problem. - Boon_DockerExplorer IIIMy original shower head would shut off completely and cause the hot water blast. I replaced it with a dribble shut off shower head and the problem went away.
- Bird_FreakExplorer IIMy shower head has a small drizzle when shut off at head. Solved that problem and boosted pressure. oxygenics head.
- BobboExplorer III believe in the KISS system. I just point the shower head at the shower wall for a second.
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RV projects you can tackle on your own with a few friendly pointers.4,352 PostsLatest Activity: Jan 20, 2025