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Mark Gadson's picture
Mark Gadson
Last seen: 3 days 6 hours ago
Joined: 8/14/16
Posts: 26
Fresh water pump

I'm thinking about replacing my original fresh water pump in order to increase my water flow rate.  The original SHURflo pump is 3.0 GPM.  I am thinking about increasing that rate to 5.0 GPM.  Does anyone foresee any problems with this proposed upgrade?

I'm looking at both the SHURflo Aqua King II and the Jabsco PAR-Max Plus pumps.  Any thoughts on either of these pumps?

As always, any and all input in appreciated.

Thanks!

Mark and Karen Gadson
​West Chester, PA
1995 Catalina 36 Mk II (Hull 1458) - Tall Rig; Wing Keel; M35
​Home Port:  St Michaels, MD
Boat Name: Magnolia

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Mark and Karen Gadson
​West Chester, PA
1995 Catalina 36 Mk II (Hull 1458) - Tall Rig; Wing Keel; M35
​Home Port:  St Michaels, MD
Boat Name: Magnolia
Chachere's picture
Chachere
Last seen: 1 day 9 hours ago
Joined: 10/27/10
Posts: 517

Only though is that this will likely result in more profligate water use (and waste) -- which is hardly a good thing, given the limited tankage we have on our boats. Not sure why 3 GPM wouldn't be sufficient.

 

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Matthew Chachère
s/v ¡Que Chévere! #466
1985 C36 MKI tall rig fin keel M25
Homeported in eastern Long Island, NY

knotdoneyet
Last seen: 5 days 21 hours ago
Joined: 7/27/12
Posts: 236

The aqua king ii has lasted much longer than the previous jabsco(s) - yes plural.

I believe we have the 4.0 model and it puts out a very good flow.  

The biggest water saver for us was replacing the sink faucet with a single lever model.  
 

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2000 C36 MKII 1825

Mark Gadson's picture
Mark Gadson
Last seen: 3 days 6 hours ago
Joined: 8/14/16
Posts: 26

Jim,

Thanks for the comments about the Aqua King II.  Glad to hear the 4.0 GPM is adequate.  I am also going to add a single-lever galley faucet.  What brand and model did you use?

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Mark and Karen Gadson
​West Chester, PA
1995 Catalina 36 Mk II (Hull 1458) - Tall Rig; Wing Keel; M35
​Home Port:  St Michaels, MD
Boat Name: Magnolia
cmhuber
Last seen: 2 weeks 4 days ago
Joined: 2/15/14
Posts: 14

We use the Agua King II as well and water presure is more than adequate. We have a ac/heating unit so a larger pump woule be a tight fit given the ac unit  and the location of the water heater.

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Chuck Huber
Sugaree
C36 MKII 2000
#1887
Tall Rig, Wing Keel
Boat Location: Saugatuck, MI
pkeyser's picture
pkeyser
Last seen: 2 hours 56 min ago
Joined: 5/18/13
Posts: 303

Mark-
You might want to double check that you don't have a water strainer buried in amongst the plumbing somewhere, and it needs cleaning. We experienced this, and after cleaning the strainer screen, it really improved the flow rate. 

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Paul & Wendy Keyser
"First Light"
Newburyport MA/Rye NH
2005 C36 MKII #2257
Wing, M35B

Mark Gadson's picture
Mark Gadson
Last seen: 3 days 6 hours ago
Joined: 8/14/16
Posts: 26

Paul,

Thanks for your thoughts about the strainer.  I check all my strainers often because, as you say, it makes a big difference. One of the main reasons I want to bump up the pressure is that we use our transom shower quite often and the flow is not very good by the time the water runs the full distance of the water line to the shower head. 

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Mark and Karen Gadson
​West Chester, PA
1995 Catalina 36 Mk II (Hull 1458) - Tall Rig; Wing Keel; M35
​Home Port:  St Michaels, MD
Boat Name: Magnolia
knotdoneyet
Last seen: 5 days 21 hours ago
Joined: 7/27/12
Posts: 236

Good point about strainer at the faucet.  Just completed a now laughable troubleshooting session where I tore into everything to find the strainer at the pullout handle was completely blocked - doh!

Bought this one from Catalina Direct and love it.  Had to use my dreamer tool to widen the hole just a bit. I also cut a hole to give access, otherwise this is sort of impossible.
https://www.catalinadirect.com/index.cfm/product/1427/galley-faucet-pull-out.cfm

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2000 C36 MKII 1825

bakerha's picture
bakerha
Last seen: 2 days 10 hours ago
Joined: 7/23/10
Posts: 226

Mark: Just replaced my old Jabsco with the newer/larger ShurFlo Aqua King II 4.0 gpm pump. I feel that 4gpm is plenty and delivers excellent pressure at all faucets. But I have a MK1 with no transom shower. It is quieter than the original - BUT still not quiet. It also rapid cycles when you are running the faucet slowly to preserve water so I had to reinstall my accumulator as well. The Admiral really likes the new pump and the new valves I installed under the stove to allow quick selection of water tanks. A pretty easy upgrade.

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_____________
Harold Baker
S/V Lucky Duck
Sandusky Ohio, Great Lakes
1989 C-36 mkI TR/WK M25XP

Mark Gadson's picture
Mark Gadson
Last seen: 3 days 6 hours ago
Joined: 8/14/16
Posts: 26

Harold,
Thanks for your comments and thoughts.  I am now leaning towards the ShurFlo Aqua King II 4.0 GPM pump as a replacement after hearing that it has decent water pressure. I am planning on doing the replacement after my boat is hauled for the winter after I drain the tanks and prior to winterizing.  I am  also going to build a water manifold like you and others have done that will be located under the galley stove/oven - a much more convenient location. I will be building that this summer so I can install it and the pump right after the Fall haul out. What size and brand of valves did you use for your manifold, and where did you purchase them? Do you have any pictures of your project that might be helpful?

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Mark and Karen Gadson
​West Chester, PA
1995 Catalina 36 Mk II (Hull 1458) - Tall Rig; Wing Keel; M35
​Home Port:  St Michaels, MD
Boat Name: Magnolia
Bardo
Last seen: 2 months 1 week ago
Joined: 5/29/17
Posts: 2

On a 36 mk1 has anybody upgraded to the whale pump with 2 liter accumulator? Was it easy? Did you have to move anything?

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