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Old 10-07-2014, 07:10   #1
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Join Date: Mar 2010
Location: Hamilton, MA
Boat: Cabot 36 - Que Sera
Posts: 22
Freshwater system/pressure issues

I installed a new Whale freshwater pump (UF0815) rated at 2.2 GPM a year ago, expecting that it would give me plenty of power for my two faucets and occasional showering on my 36-foot sailboat. It seemed to work fine last season, but during the winter I added a hot-water check valve and things have deteriorated.

Since adding the check valve, I am typically greeted with an explosive burst of water and air when I turn on the main galley faucet, located just a few feet from the pump. Rather than a smooth flow of water, it is intermittent at best even with the pump activated well in advance.

Among the things I have checked/considered:
-water tanks are full
-the strainer that came with the pump is clean
-I've considered adding an accumulator tank, although my reading suggests that should not be necessary with a modern pump
-I've removed my water filter from the line
-I'm wondering if my 35-year-old galley faucet could be the culprit and plant to check the faucet in my head to see if the same problem occurs

Any advice in troubleshooting and/or improving the problem would be greatly appreciated.
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Old 10-07-2014, 07:49   #2
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Join Date: Nov 2008
Location: Deale, MD
Boat: PDQ Altair, 32/34, "Shoal Survivor"
Posts: 3,455
Re: Freshwater system/pressure issues

The most likely source of air is degassing of air in the hot water heater. Normally, this only happens if the hot water heater is seriously overheating (over 160F at least in some small area). Have you noticed how a pot begins to hiss, then stops, then boils when it hits 212F? The pre-boil is degassing.

Why did you add the valve? Was hot water somehow coming backwards? If so,what ever is causing the backflow is the root of the problem, as it is probably also the cause of the over heating. Is it an instant water heater?
"Climbing (sailing) is like fun, only different."

Tom Pattey, Scottish ice climber
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Old 10-07-2014, 08:18   #3
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Join Date: Mar 2010
Location: Hamilton, MA
Boat: Cabot 36 - Que Sera
Posts: 22
Re: Freshwater system/pressure issues

Thanks for the reply. I added the check valve because the hot water was also coming our of the cold water side of the faucet. The problem existed long before updating the freshwater pump.
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