Water Pump - what spec

Whitelighter

Whitelighter

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Started a new thread as I want a specific answer:

Boat is 50ft. 2 proper showers, three sinks, transom shower and dishwasher

Currently have 50l/min impellor pump with 2 litre accumulator tank
Want to reduce noise as much as possible. Recommendations from those that sell pumps are varied.

Options on the table are:

Replace with another Garleschelli Indomini 1B Ecojet for $800+IVA

Replace with a Twin membrane pump with accumulator, twin pump has the advantage that you use one pump for light use and it steps up for heavy use with pump 2
Options are this one Xylem CW435 at £515 ex VAT and has a flow rate of 32l/min or this one Aquajet Pump Duo which is £674.06 + VAT but has a higher flow rate of 40l/min.

The other oprion is a more basic Jabsco Vflow constant pressure pump which is electronically controlled and doesn't require an accumulator tank. £292+vat for these but only 18l/min flow rate

What I dont know is what flow rate do I actually need? I assume the boat is currently set up to have everything running all at once with some reserve. I admit the 18l/min of the constant pressure pump seems low compared to what we have. In reality we have never run both showers at once, though the dishwasher is an addition.

The other thing is noise - is a membrane pump (or whatever they are called) which are all options apart from the original quieter than the impeller pump? My partner is super noise sensitive so if we can get as quiet as possible that would be good.

Budget also a consideration, but I do want something that works. Please if you have experience Im after advice.
 
Snap
As said in the other thread we were in exactly the same position .
Actually wanted to go out and anchor off a few days .
Woke up to find dead pump yep a “Rolls Royce “ so called - Gianneschi.
With the hour Guardian sent a boat sparky and he fitted one of these - Jabsco 18 L just as you suggest .No accumulator , bit plastic - a kind of Hyundai of pumps , was €180 + 1/2 hr Labour - carries them on his van - arrived with one in hand .Something like this - left the box on board .
https://www.tcschandlery.co.uk/jabs...MIpfeMkvqE2wIVxZ3tCh0Lug1oEAQYBiABEgKPWvD_BwE


So what’s it like , bearing in mind the Gianneschi was hidden away in the ER , I don,t see it so aesthetically it’s a none argument.
Works fine no difference detected in functionality- 3 showers , 2 sinks , and 2 fresh bogs with bidet function so a total of 9 outlets .10 inc the ER tap .
Noise is tbo slightly a bit more ,but it’s hard to remember as the Gianneschi towards to end became I think noisey- not sure .
So I really can,t give a definitive answer on that .
It’s not silent nor was the Gianneschi .
Beauty is like a Hyundai there’s dealers ( chandelier) that stock em in every marina .
Only you will know what modal of pump you have - like it’s not parked on the drive :)
Hope this helps
 
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Re noise
Imho I like to hear them in the background.
Reason you can hear them pulsing if somebody has not turned off a tap properly, or importantly if there’s a leak somewhere in the system .
Rarther than wake up to find a pool of water in a cupboard etc
 
BartW said:
+1

what a shame to spoil such a iconic boat with a rubbisch pump ;)
Click to expand...

It’s lighter ,shave a kilo or two off.:)
According to MapisM , in the other row we are having being going lighter the ride should improve .:) speed yes ride No

The fitter replumbed it a bit where the old one was , so to make an easy change out next time .
They can,t be that bad guys ? Those Jabsco things. I mean a Swatch tells the time and easy to replace .
How ever if there’s a next time and we have no pressing time constraints then I guess I can allways revisit the issue ?
 
Whitelighter said:
Started a new thread as I want a specific answer:

Boat is 50ft. 2 proper showers, three sinks, transom shower and dishwasher

Currently have 50l/min impellor pump with 2 litre accumulator tank
Want to reduce noise as much as possible. Recommendations from those that sell pumps are varied.

Options on the table are:

Replace with another Garleschelli Indomini 1B Ecojet for $800+IVA

Replace with a Twin membrane pump with accumulator, twin pump has the advantage that you use one pump for light use and it steps up for heavy use with pump 2
Options are this one Xylem CW435 at £515 ex VAT and has a flow rate of 32l/min or this one Aquajet Pump Duo which is £674.06 + VAT but has a higher flow rate of 40l/min.

The other oprion is a more basic Jabsco Vflow constant pressure pump which is electronically controlled and doesn't require an accumulator tank. £292+vat for these but only 18l/min flow rate

What I dont know is what flow rate do I actually need? I assume the boat is currently set up to have everything running all at once with some reserve. I admit the 18l/min of the constant pressure pump seems low compared to what we have. In reality we have never run both showers at once, though the dishwasher is an addition.

The other thing is noise - is a membrane pump (or whatever they are called) which are all options apart from the original quieter than the impeller pump? My partner is super noise sensitive so if we can get as quiet as possible that would be good.

Budget also a consideration, but I do want something that works. Please if you have experience Im after advice.
Click to expand...
Thing is water requirement doesn't actually increase with waterline length, even with two proper showers - likelihood is you will only have one in use at any time.

So why not adopt a simple 3 bar 17 l/min reliable pump for < £60, indeed you can buy a spare with it for £120 but likely will not need it for a long time. My Seaflo provides me exactly that - reliable water supply at a fairly constant pressure especially if I had a 2lt accumulator.
 
BartW said:
what a shame to spoil such a iconic boat with a rubbisch pump ;)
Click to expand...
LOL, yeah, I'm not sure Amati would approve.
But I have to say, high reliability of onboard fresh water system is more critical on boats meant for extended cruising and liveaboard, for very obvious reasons.
If I think back to my open sportcruiser days, even if we did liveaboard for a few days in a row occasionally, we would have been much less annoyed by a failure of fresh water pump, compared to our current boat usage.
Otoh, possibly age has also something to see with that... :rolleyes:
 
No comment on pump type but why would you want more than 18lpm? I only carry 400 l of water. If I go out for an extended cruise I have 2 kids and 2 adults to shower. They dont get any cleaner if I'm pumping out 50lpm but my water tank will notice. Just how big is your water tank that the extra extravagance would not be noticed?

Edit. Before any wise guy says turn the taps down which is self defeating, you try hawking around the shower door saying dont turn the taps full on. Especially with wives and kids such considerations are not met very well.
 
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I don't understand why a 50ft boat would need a domestic water pump any different to a smaller boat - possibly a point is reached where the resistance in the pipes becomes significant.
Surely you do not need the luxury of operating all taps and showers at one time? Or is it the dishwasher that is a governing factor ?
Al of the above solutions seem excessive and designed only to empty the water tank as fast as possible.
 
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