Cruisers Forum
 


Join CruisersForum Today

Reply
 
Thread Tools Search this Thread Rate Thread Display Modes
Old 09-02-2019, 06:30   #1
Registered User

Join Date: Feb 2019
Posts: 4
Little Wonder water maker

I have a Little Wonder water maker on my Hunter sailboat. I believe it's the LW200 model. It does not seem the prime easily or get adequate water flow to the unit. It has a March booster pump. Has anyone replaced their booster pump on this type of unit? Thank you for any help or recommendations.
__________________

joe_bower is offline   Reply With Quote
Old 09-02-2019, 06:58   #2
Registered User

Join Date: Mar 2017
Posts: 9
Re: Little Wonder water maker

I got a cheap Chinese 12v pump off aliexpress for about $8, does the job just as well as the crazy priced original, quieter and uses less power. There are a huge range of pumps on ali express, it should be a centrifugal type rather than diaphragm. They are sold mainly to drive garden fountains. If in doubt as to the longevity just buy two! Mine has been fine though.

I also replaced the main drive motor with a BLDC motor so I can set the rpm exactly and uses less power.

Edit: PS check the booster pump is mounted below the waterline and with a straight pipe to prevent airlock or preferably directly to the seacock, it is not self priming and will be damaged if run dry.
__________________

syohana is offline   Reply With Quote
Old 09-02-2019, 13:41   #3
Registered User

Join Date: Feb 2019
Posts: 4
Re: Little Wonder water maker

Thank your response. I am just curious why the pump cannot be a self priming diaphragm type?
joe_bower is offline   Reply With Quote
Old 09-02-2019, 13:45   #4
Registered User

Join Date: Feb 2019
Posts: 4
Re: Little Wonder water maker

Also, what GPM and pressure should the new one produce? Thanks so much.
joe_bower is offline   Reply With Quote
Old 09-02-2019, 13:47   #5
Registered User
 
SV_Harbinger's Avatar

Join Date: May 2018
Location: Naskentucket Bay
Boat: Catalina 30
Posts: 197
Re: Little Wonder water maker

I would assume it would have to do with the pulsating flow that comes out of a diaphragm type pump not being entirely familiar with the unit you have, I can't say with certainty but if I were to come up with a reason I would say that would be it. I'm sure someone here could give you a better answer than I can.
SV_Harbinger is offline   Reply With Quote
Old 09-02-2019, 14:10   #6
Senior Cruiser
 
44'cruisingcat's Avatar

Cruisers Forum Supporter

Join Date: Sep 2006
Posts: 8,914
Images: 69
Re: Little Wonder water maker

Quote:
Originally Posted by joe_bower View Post
Thank your response. I am just curious why the pump cannot be a self priming diaphragm type?
You could use one of those, but unless you spend a lot,not many are suited to continuous running for hours at a time.

The pressure needed depends on how high your high pressure pump is mounted.

The Parker Racor pump only requires pressure greater than zero on its suction side.

Required flow rate is pretty small really. Something like 400 litres per hour.
44'cruisingcat is offline   Reply With Quote
Old 09-02-2019, 14:38   #7
Registered User

Join Date: Oct 2011
Location: East Coast, Canada
Boat: Big C Marine, 15 metre Catamaran
Posts: 541
Images: 2
Re: Little Wonder water maker

Just a slight correction to 44's post.

As I recall. The Little wonder 200, hp pump only pumps 0.3 gallons per minute, which is just a little more than a litre a minute. So any march pump that pumps even 100l an hour would do the trick.

I don't mean to step on anyone's toes, but you'll have more choice in pumps if you know what the true minimum is.

The 200 has the 708-1 pump, at 0.37GPM (1.4lpm) max flow. That's about 85 lph.

A US gallon (Gallonette) is 3.78 litres in volume.

http://www.aquacontrolmarine.com/wp-...rol-Marine.pdf

Cheers.
Paul.
GRIT is online now   Reply With Quote
Old 09-02-2019, 15:05   #8
Registered User

Join Date: Jan 2013
Posts: 42
Re: Little Wonder water maker

Quote:
Originally Posted by joe_bower View Post
Thank your response. I am just curious why the pump cannot be a self priming diaphragm type?
I did repurpose a shurflo diaphragm pump from the deckwash as a temporary fix until the one from aliexpress arrived, it did work but it was 20 times the price, very noisy, cycled on and off every 3 seconds on the pressure switch, used way more power and has lots of moving parts and seals to wear out or fail, which it eventually did, so I then had to rebuild it too.

A sealed magnetic drive centrifugal type like the original one is ideal, cheap, reliable and will last an extremely long time if you don't let it run dry. It will KISS principle. Not sure what effect the constant fluctuations of input pressure from a diaphragm pump would have but it can't be good.

Check what pipe fittings it comes with, all options are available and it's a lot less hassle if you can put your original hoses straight on it, most of them have smaller diameter or threaded fittings.
chris14679 is online now   Reply With Quote
Old 09-02-2019, 15:36   #9
Moderator
 
a64pilot's Avatar

Cruisers Forum Supporter

Join Date: Oct 2013
Location: Albany Ga.
Boat: Island Packet 38
Posts: 25,404
Little Wonder water maker

Any kind of positive displacement pump will need some kind of relief valve etc. to prevent pressure from going too high when the high pressure pump is off.
Then most likely its not a continuous duty pump, and if not then you will likely need some supplemental cooling as many are temp protected and will shut down when they overheat.

Centrifugal pumps like ones meant for air conditioning would seem to be ideal as they run for thousands of hours, continuously.
However they may not develop enough pressure to have a significant pressure left after going through two partially clogged filters
a64pilot is offline   Reply With Quote
Old 09-02-2019, 23:51   #10
Senior Cruiser
 
44'cruisingcat's Avatar

Cruisers Forum Supporter

Join Date: Sep 2006
Posts: 8,914
Images: 69
Re: Little Wonder water maker

Quote:
Originally Posted by GRIT View Post
Just a slight correction to 44's post.

As I recall. The Little wonder 200, hp pump only pumps 0.3 gallons per minute, which is just a little more than a litre a minute. So any march pump that pumps even 100l an hour would do the trick.

I don't mean to step on anyone's toes, but you'll have more choice in pumps if you know what the true minimum is.

The 200 has the 708-1 pump, at 0.37GPM (1.4lpm) max flow. That's about 85 lph.

A US gallon (Gallonette) is 3.78 litres in volume.

http://www.aquacontrolmarine.com/wp-...rol-Marine.pdf

Cheers.
Paul.
I was basing it on the output. Ours, with a different membrane, makes 40 - 48 lph fresh water. I was assuming that would be about 10% of saltwater flow.

Looks like our yield is actually much higher than 10%.
44'cruisingcat is offline   Reply With Quote
Old 10-02-2019, 12:50   #11
Registered User

Join Date: Sep 2017
Location: Langley, WA
Boat: Nordic 44
Posts: 728
Re: Little Wonder water maker

To get it to prime you need to back off the pressure regulator valve until water is flowing through the pump then adjust the regulator to your high pressure setting. At least that is the way I did it on my Little Wonder 150.
stormalong is offline   Reply With Quote
Old 11-02-2019, 13:29   #12
Registered User

Join Date: Feb 2019
Posts: 4
Re: Little Wonder water maker

Thanks everyone for help and support. I ordered a cheap pump from Amazon. I'll let everyone know how it works out.
__________________

joe_bower is offline   Reply With Quote
Reply

Tags
water

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes Rate This Thread
Rate This Thread:

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Village Marine Little Wonder water maker. Davidhoy Plumbing Systems and Fixtures 16 06-12-2016 12:55
Little Wonder Water Makers - Desalinators Darrelwalters Liveaboard's Forum 2 27-10-2016 19:14
little wonder 200 water maker - help troubleshooting RickyEM Plumbing Systems and Fixtures 18 11-01-2014 07:31
Powersurvivor 40e VS Little Wonder Water Maker unbusted67 Product or Service Reviews & Evaluations 17 25-08-2013 13:14
Little Wonder AnchorageGuy Provisioning: Food & Drink 4 20-10-2003 14:13



Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -7. The time now is 13:50.


Google+
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2019, vBulletin Solutions, Inc.
Social Knowledge Networks
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2019, vBulletin Solutions, Inc.

ShowCase vBulletin Plugins by Drive Thru Online, Inc.