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Old 10-17-2013, 08:23 AM   #1
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On Demand Water Pump and Accumulator

Has anyone installed an accumulator on their unit that is equipped with an on demand water pump? Our 2012 is equipped with an on 'demand pump'.

It would seem the on demand pump must have the 'on' and 'off' pressure parameters set close to one another, and would probably be of little value to install an accumulator, or am I wrong?

On my old unit, with no on demand pump, I found the accumulator (5 gals.) especially useful at night when someone uses the bathroom. You could normally get 2 to 3 flushes before the pump would come on, or more if you turned the pump off at night.

I would welcome hearing from anyone who has tried this, or has ideas.

Thanks and have a great day.
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Old 10-17-2013, 08:54 AM   #2
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By "on demand" are you talking about a pump with pressure adjustment? I knew that I had read about using an accumulator with one and found the forum.
http://lanceowners.hoop.la/topic/shu...008-adjustment
What this person found was that there was no need for an accumulator with this pump.
On my old TT I installed an accumulator and it was a nice mod, but haven't looked into do it on my new 2013 Jayco. Your question has me thinking that I should check the model of pump first to see if the tank would be needed.
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Old 10-17-2013, 09:19 AM   #3
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To me, on demand means that when you call for water the pump turns on and supplies it. An accumulator tank will work fine with an "on demand" pump such as is installed on RV's. Look in the mods section for my write up on my accumulator tank install. I bought a 2 gallon captive air "bladder" tank off Ebay for under $20 I think and simply tee'd it into the cold water line under the bathroom lavatory cabinet. Works awesome! My pump doesn't cycle on/off every time you crack a faucet and I can flush the toilet several times in the night without the pump coming on. I'll never go back to a typical pumping system.
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Old 10-17-2013, 10:16 AM   #4
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Here is mine. The shurflo accumulator tank hooked up to a shurflo pump:


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Old 10-17-2013, 10:20 AM   #5
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Here is mine. The shurflo accumulator tank hooked up to a shurflo pump:


The foam isolation is a nice touch! I have a 2 gallon accumulator tank.
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Old 10-17-2013, 10:22 AM   #6
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Two gallons would certainly be better, even less pump cycling.
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Old 10-18-2013, 02:41 PM   #7
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I can see having the accumulator on a TT if you operate on tanks most of the time, but a waste of time if you are at campsites with a city water connection most of the time.
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Old 10-18-2013, 02:58 PM   #8
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I can see having the accumulator on a TT if you operate on tanks most of the time, but a waste of time if you are at campsites with a city water connection most of the time.
Very true. Many of the state parks here have electric only, no water hookups so it makes sense for us.
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Old 10-18-2013, 03:57 PM   #9
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I also have a Surflo pump and their matching accumulator. Since 99% of my camping is without water hookups, this really cuts down on the short cycling of the pump. It is too small to keep the pump from cycling if you flush the toilet though, but it was all I had room for. The water flow is also much more consistent now too, I would recommend the upgrade to anyone.
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Old 10-18-2013, 04:40 PM   #10
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I can see having the accumulator on a TT if you operate on tanks most of the time, but a waste of time if you are at campsites with a city water connection most of the time.
I use my RV while in route. An accumulator can prevent the pump from running dry. It also allows me to wash hands or use the toilet without turning the pump on.
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