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 ?
Hot Cold Shower
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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.
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.
RT Firefly
Enigma
Greetings,
Andropause?
Andropause?
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 ?
Any Manatee owners have this fitting ?
healhustler
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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.
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" .
healhustler
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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.
Shoalwaters
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How sbout a picture of the "thing". Sounds like a pressure regulator.
HopCar
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Come on guys, you can't let this thread die without showing us a picture of the Thing.
Northern Spy
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I'll wager on pressure regulator too.
Maybe these guys might know...
Maybe these guys might know...
FF
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I will guess an air bleed.
ulysses
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Most likely it is a thermal pressure relief valve. When or if the water heater fails to turn off when the temp reaches a set point the pressure and temp. will increase triggering the relief valve to open and reducing the pressure building in the water heater.
No, it has a relief valve mounted on the front of the heater. It also has no visible moving parts other than a typical valve stem, mine had no hand wheel. The bottom has pipe threads below the bonnet and inside there is the base of the stem with nothing attached to it. Larry you are going to have to photograph yours as mine has disappeared, the installer I used for the hot water heater was going to save mine to try and find out what it is but it has disappeared from his work truck. The mystery continues!!
Kartracer the flow restrictor that caused the hot cold water is in a telephone type shower head. On ours you screw off the shower head and it sits in a recess in the middle of the rubber seal washer, it had turned sideways and went part way up the handle. (photos). The plumber/boater friend told me the new style Shurflow revolution pump would sense the alternating restriction from the restrictor plus you always close down on the hot water valve when mixing to get the right temperature in the shower and go into a run/ bypass mode causing the fluctuation in the hot water supply.
Sunchaser we have a check valve on the cold water inlet to the hot water heater to prevent hot water back flowing into the cold water piping. during the heater install we checked to make sure it was in good shape and functional. Expansion tank removed as it will cause the new type Shurflow pumps to hunt and not have a clean shut down as per the pump instruction sheet.
I thought to remove the flow restrictor which gives a great flow from the shower head but with a 6 gallon hot water heater the nice warm shower might not last very long. I'm Navy trained and still do the get wet, soap, rinse routine. Plus "Hollywood type showers" don't get you any cleaner.
Bill
Sunchaser we have a check valve on the cold water inlet to the hot water heater to prevent hot water back flowing into the cold water piping. during the heater install we checked to make sure it was in good shape and functional. Expansion tank removed as it will cause the new type Shurflow pumps to hunt and not have a clean shut down as per the pump instruction sheet.
I thought to remove the flow restrictor which gives a great flow from the shower head but with a 6 gallon hot water heater the nice warm shower might not last very long. I'm Navy trained and still do the get wet, soap, rinse routine. Plus "Hollywood type showers" don't get you any cleaner.
Bill
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