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Old 06-30-2010, 12:22 PM   #1
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Best water pump?

After putting up with the rattling and banging of the original water pump in our 99 Rexhall Aerbus, I've decided to replace it.

2 questions: 1. What is the quietest and most efficient water pump?

2. The existing one is located under the bed and is rather awkward to get at. Can I bypass the effort of struggling to install a new one under the bed and put it in the basement without too much trouble?

Thanks for any advice


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Old 06-30-2010, 01:18 PM   #2
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As to where to mount it - it depends on how your plumbing system is arranged. I'm not familiar with your coach but if the existing pump is simply attached to two hose, and you can trace those hoses back down to a location closer to your water tank in the basement, I don't see why not. Actually, having the pump closer to the tank will make it work easier rather than having to lift the water from the tank to the pump.

I have a Shurflo 7.7 Smart Sensor pump. It's quiet and has lots of water capacity - 5.7 GPM. It's a variable flow pump so it doesn't hammer as much as the on-demand pumps which have constant flow and kick on and off to regulate the water output. Because it is so large it soes have a few issues to deal with though. You'll need a high capacity pump strainer to allow enough water to enter the pump to prevent cavitation. It's also recommended to use the flexible hose kit rather than connect it direct to the Pex lines in order to sdampen vibrations from the high water flow. Lastly, you may need a larger water pump relay. The standard 10 amp water pump controllers (relays) may be undersized and starve it for power. Some RVers found this out by burning out pumps so a larger relay and wiring gauge may be needed.

Many are now going with the AquaJet variable flow pump. It's a bit smalller in capacity, 4.5 GPM if I recall correctly, and isn't as picky as the larger ShurFlo.

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Old 06-30-2010, 05:03 PM   #3
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In my opinion, the closer to the water tank you can locate the pump the better. The pump sucks water from the tank. Any air getting between the tank and the pump will cause the pump to run dry until water reaches it and that air is pump thru your system until purged by opening a faucet or flushing the toilet. It's my understanding the some pumps today can be run dry but it's also a fact that heat is will deteriorate rubber over time and lead to early failure.
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Old 06-30-2010, 09:01 PM   #4
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If you have room where the old pump was located, you might want to add an accumulator tank for smoother operation. It installs with just a tee fitting and doesn't require any servicing.
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Old 07-01-2010, 11:37 AM   #5
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I have just a basic Shurflo 2088 unit in ours. Used these type for many years and they seem to last for decades. Ours has a rubber pad under the feet. It keeps the "vibration" down so it tends to make it quieter. Our current water pump is inside the living area of our RV. That may be all you need to do to yours.
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