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Old 08-17-2015, 12:51 PM   #1
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Hot Cold Shower

I had the old leaking hot water heater replaced with an identical heater. Removed the expansion tank from the water pump discharge system because the water pump is one of the new Shurflow models that recommends no expansion tank. The only other change was removing a brass fitting that was screwed into the top of a pipe tee because it did not look like it served any purpose in the hot water discharge from the heater. The fitting looked like a valve bonnet with a stem but the bottom internal end had nothing in it. Seaward instruction said to hook up the water inlet and outlets with 1/2" NPT pipe nipples which was done. Has anyone had this problem ?
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Old 08-17-2015, 01:16 PM   #2
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What is the problem or did I miss something?
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Old 08-17-2015, 03:33 PM   #3
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When using the shower the water temperature alternates from hot to cold continuously.
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Old 08-17-2015, 03:46 PM   #4
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I wonder if you still have air in your lines.
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Old 08-17-2015, 04:41 PM   #5
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No we purged out all the air by opening all the hot water faucets after the hot water heater was installed. One additional problem is a chatter or slight water hammer when a faucet is closed. I saved the mystery fitting that we unscrewed from the top of the pipe tee and if no other causes explain the problems can be reinstalled.
Possible fixes might be to adjust the water pump discharge pressure on the possibility that the pressure of the cold water entering the heater is to high and causing temperature layers in the 6 gallon tank, I think that's a stretch but looking for anyone who has had this problem and what was the fix.
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Old 08-17-2015, 04:47 PM   #6
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Greetings,
Andropause?
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Old 08-17-2015, 05:51 PM   #7
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Greetings,
Andropause?
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Old 08-17-2015, 06:13 PM   #8
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Does this occur only at the shower, or does the galley sink do the same thing?

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Old 08-17-2015, 08:00 PM   #9
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It only occurs when mixing the hot and cold water in the shower.
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Old 08-17-2015, 08:26 PM   #10
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It only occurs when mixing the hot and cold water in the shower.
Ok, then it doesn't sound like it's related to the water heater. Does the shower have a tempering or anti scalding valve?

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Old 08-18-2015, 07:36 AM   #11
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No Ted, but the brass fitting I described in my #1 post could be one I guess as It is the only change to the system other than removing the expansion tank and of course installing the new hot water heater. The brass or bronze fitting looked like a valve bonnet with a stem on top and had pipe threads on the bottom that screwed into the top of a pipe tee. The bottom end was hollow, no stem or anything visible in it and did not have a water source fitting as most tempering valves have. I guess I will reinstall it and see if it cures the problem, maybe it is an oriental tempering valve.
Any Manatee owners have this fitting ?
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Old 08-18-2015, 07:41 AM   #12
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The problem could be the hot water has more pressure than the cold you may need a thermal mixer not just a tap mixer .
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Old 08-18-2015, 08:40 AM   #13
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Bill: looked through my archive of water systems on Manatees and saw nothing, but I climbed under my galley and looked at my original equipment system (yeah, even the hot water heater) and there it was....some kind of thingy on top of the hot water exit from the heater, looking approx like your description. If it's on mine, it must have been for something. I thought it was a bleed device.
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Old 08-18-2015, 09:10 AM   #14
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Thanks Larry, I will reinstall the "thing" once I get to the boat and chalk it up as it being an inscrutable oriental wisdom fitting and hope that since it's as old as the boat that it keeps working.
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Old 08-18-2015, 11:13 AM   #15
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back flow preventer?? pressure regulator?? turboentabulator??
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Old 08-25-2015, 09:12 PM   #16
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The "thing" as it turns out had nothing to do with the problem. I had a plumber look at the "thing" and he was correct it has nothing to do with the problem and had no idea what it function might be. The problem with the hot cold shower was traced to a flow restrictor in the shower head that had dislodged in the shower head. The new style Shurflow Revolution pump was sensing the restriction because the Manatee is a small hard piped system which caused the flow of hot water to pulse. So Larry if and when you change out your hot water heater you can feel free to remove the "thing" .
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Old 08-25-2015, 10:16 PM   #17
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Bill: You still can't be sure what the thing is for. I removed mine and now the boat has a 3 inch list to port. Thanks for passing on the info.
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Old 08-26-2015, 08:12 AM   #18
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How sbout a picture of the "thing". Sounds like a pressure regulator.
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Old 09-01-2015, 11:49 PM   #19
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Come on guys, you can't let this thread die without showing us a picture of the Thing.
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Old 09-02-2015, 12:15 AM   #20
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I'll wager on pressure regulator too.

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