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Old 04-11-2012, 02:38 AM   #1
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Default Hot water Pressure low

Guys, I just took delivery of the boat('99 2800 SCR). I always think you find a lot more out once you have the boat...

The hot water pressure is low. Here is what happens, I turn on the hot water side in the sink. It flows normally(no hot water yet) and then warm water starts to come out after 30-40 seconds, then slowly the pressure starts to drop and then turns to a trickle. I turn it off, the cold water on and the pressure is normal. Turn the hot back on while the cold is on and then turn cold off, hot water comes out semi normal then very quickly back to a trickle. Almost as if the cold is crating a suction to bring the hot forward, but once the cold is removed it turns back to a trickle. This happens at all three points, the salon sink, head sink, and swim platform shower head.

I checked all the hoses, no kinks, pinches, or visible restriction.

I have searched the internet, I have heard some say check the filter.

Where is the filter??

Any help would be appreciated.
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Old 04-11-2012, 02:40 AM   #2
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Has the heater been used a lot ? Maybe they are prone to clogging up from hard water..
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Old 04-11-2012, 02:45 AM   #3
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I am not sure. Just bought the boat. Works fine for 30 seconds once pressure has built up(i am guessing). Long enough to pass a sea trial and survey. I thought it was totally functional.
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Old 04-11-2012, 12:27 PM   #4
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Any chance it has a water heater bypass installed on it? They are useful when winterizing so it is common for them to be used. There are many models of thse bypass kits but I have had 2 different on my RV.
Kit 1 simply had a 1 way valve on the hot side so water could exit only, not enter. Then there were shut off valves and 3 way T fittings that allowed you to shut off the cold intake which diverted water up to the hot side (which is supposed to block water coming in to the tank). Now this 1 way valve is just a spring loaded plug that can become stuck on you. Mine stuck but for me it just allowed 6 gallons of AF to fill the tank instead of bypassing it. I guess it could stick in a way to restrict flow though.

I have since replaced that system with a kit that has 2 3 way shut off valves at the cold and hot side and then a jumper hose between them. Set both valves to open and water flows into the tank on cold and out of the tank on hot. Set both to bypass and water is diverted from the cold up the jumper hose and then out the hot side hose outlet. In theory you could have a restriction here as well or maybe it is just not open all the way?

That is about all that I can think of on the hot side that could cause this that would not affect cold.

Good luck!
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Old 04-11-2012, 03:04 PM   #5
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interesting that the hot water is the only one affected....otherwise I'd say you have to pull the screens at the faucet to clean them out....might wanna do that anyway just to see if there is any trash getting in the way....

the hot water system is really simple...pressure from the pump charges the cold water system which feeds the water heater...then pushes the water to the faucets...that's about all there is....does the water pump stop cycling when the water starts to trickle????......could be an air block...maybe....

I'll have to think about this one...definitely something is stopping the water flow...

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Old 04-11-2012, 04:11 PM   #6
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I tried to draft a reply, but timed out. Luckily for you, here is the short version. As SP said (above) the water tank goes into a pressure water pump that feeds both teh hot and cold side. You should hear the pump coming on the minute you open any valve (hot or cold). Confirm that you're hearing the pump cycle on and confirm that it sounds the same. Trace the water supply from the pump to the HW tank, then from teh tnak to the faucets. Does this occur on ALL faucets? does the sound of the pump decrease or the cycles decrease when the hot side is open?

If you do have a HW bypass, try bypassing the HW tank and see if you can reproduce. This will essentially run cold on both sides, however if it pumps strong by bypassing the HW heater, then it is something or somewhere on/at the HW heater.
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Old 04-12-2012, 03:00 PM   #7
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Just a note;

I use an inline water filter on the inlet side of my hose when filling the water tank. This keeps bad stuff from getting into my hose and onboard water systems as well as keeping hard water spots from forming while cleaning the windows and fiberglass.

http://www.amazon.com/Camco-40043-Ta...=1ROOYQ2TR53MQ
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Old 04-12-2012, 03:20 PM   #8
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it sounds like you are pulling a vacuum on the system at the water heater side and then it keeps the water from flowing once a vacuum has built up...



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Old 04-13-2012, 12:53 PM   #9
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Quote:
Originally Posted by MCM View Post
Just a note;

I use an inline water filter on the inlet side of my hose when filling the water tank. This keeps bad stuff from getting into my hose and onboard water systems as well as keeping hard water spots from forming while cleaning the windows and fiberglass.

http://www.amazon.com/Camco-40043-Ta...=1ROOYQ2TR53MQ
Good idea. I have an inline water filter as well. Mine is on the pump, either just before or just after the pump. (I haven't looked at it in months)
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Old 04-13-2012, 12:54 PM   #10
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Just a thought. Is the release valve at the top of the hot water heater leaking at all? I recall that being a common problem. That could darw air in and create a vacuum situation.
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