Looking for advice on best water pump.

[Barney23]

Just arrived in Keswick & water pump was struggling to get water to taps & has now stopped altogether.

Looking for advice on the best water pumps to buy ?

 

[Badknee]

Check the psi of yours then see if Sureflow do one

 

[Barney23]

Check the psi of yours then see if Sureflow do one

Thanks, it’s a Sureflow, 20psi.
Looking on the website they do a 30psi as well.

 

[Abacist]

Just so that the OP can find the right thing its actually SHURFLO

 

[Badknee]

Thanks, it’s a Sureflow, 20psi.
Looking on the website they do a 30psi as well.

Correct but I stuck with the 20psi. I didn’t want any pipe joints popping off due to high pressure.
£49.99 delivered on EBay

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[Barney23]

Correct but I stuck with the 20psi. I didn’t want any pipe joints popping off due to high pressure.
£49.99 delivered on EBay

Thanks, never thought of that, has there been any issues with people fitting a 30psi pump ?

 

[dave newell]

Thanks, never thought of that, has there been any issues with people fitting a 30psi pump ?

We had a customer who's 30 psi pump had been replaced with a 60psi unit. Blew the outlet connection off the boiler when it was up to temp spraying 60 Deg c water around, thankfully they had followed my advice and only switched the pump on when they needed it rather than leaving it switched on all the time.

D.

 

[Badknee]

• Thanks, never thought of that, has there been any issues with people fitting a 30psi pump ?

  Not that I know but I didn’t want to take the chance. In our moho 20psi is plenty.

 

[Nostrovia]

Also, 30psi pumps increase your water usage... it flows quicker.

 

[two]

Just so that the OP can find the right thing its actually SHURFLO

Also marketed as LILE.

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[Terry]

Just arrived in Keswick & water pump was struggling to get water to taps & has now stopped altogether.

Looking for advice on the best water pumps to buy ?

Don't know your set up/van but it maybe worth while checking if other taps are working--thinking micro switches if you have them ---Try tapping the pump and checking fuse or if you have a meter check power to pump --if none of them then yep replace pump with like for like if happy with pressure before --Shurflo start around £50 ish and sometimes places have refurbs in around £40-I have used a couple of refurbs and not had any problems ---Try Magnums ,O'leary's or ebay

 

[pappajohn]

Also, 30psi pumps increase your water usage... it flows quicker.

Not necessarily, pressure and flow aren't connected.
Shurflo do a 20psi 7ltr/min pump and a 30psi 7/ltr min pump

 

[peterc10]

pressure and flow aren't connected.

Yes they are, unless the laws of physics have changed in the last 50 years

 

[pappajohn]

Yes they are, unless the laws of physics have changed in the last 50 years

Not in this instance... And you missed the first part of the quote. "Not neccessarily"

Also, 30psi pumps increase your water usage... it flows quicker.

30psi 7ltr/min shurflo
20psi 7ltr/min shurflo

Flow resistance

 

[hilldweller]

unless the laws of physics have changed in the last 50 years

I know what you mean, but some have !

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[peterc10]

Not in this instance


30psi 7ltr/min shurflo
20psi 7ltr/min shurflo

Flow resistance

For any given system if the pressure increases so does the flow. Yes it will also depend upon resistance, but if that is the same then the flow increases.

 

[pappajohn]

For any given system if the pressure increases so does the flow. Yes it will also depend upon resistance, but if that is the same then the flow increases.

In the case of this pump and in the context of this post the resistance ISN'T the same though.
Two pump, same flow rate, different pressure.

Personally, I can't see any advantage having a 30psi pump if the flow rate is the same as a 20psi pump.
Maybe over a long distance the outlet (tap) pressure may be improved as pipework resistance would be better overcome but in general, clever marketing..... Sounds like it's better.

 

[peterc10]

In the case of this pump and in the context of this post the resistance ISN'T the same though.
Two pump, same flow rate, different pressure.

Personally, I can't see any advantage having a 30psi pump if the flow rate is the same as a 20psi pump.
Maybe over a long distance the outlet (tap) pressure may be improved as pipework resistance would be better overcome but in general, clever marketing..... Sounds like it's better.

I suspect the pumps will be the same or very similar, but they have different cut off points set for the maximum pressure. The flow rate will be based upon an open output nozzle, or at least one with very little resistance, with both, so will not relate to maximum pressure, which will only occur when the nozzle is closed.

 

[pappajohn]

So as I said, clever marketing and nothing to do with flow (both 7ltr) or delivery pressure..(Open nozzle)

Oh look, this one says 30 and that says 20 so this must be better.

 

[tonyidle]

If pipework is long, convoluted, or connected by a large number of fittings then a pump with the same flow rate but capable of operating at a higher pressure will flow more at the taps. Which is where it matters. Since the max achievable pressure can be varied by pressure switch adjustment it's somewhat academic. Anyway I don't like those pumps - a Reich twin is cheaper and flows more than twice as much as the Shurflo, is more reliable, and often easier to change. Doesn't suck either .

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[TinaLes]

We have a Shurflow in line pump, had the same in our last caravan, they are good a t pumping water, but sound like a woodpecker in a cupboard when using. Last service it was adjusted as it was pulsating, not that we really noticed as it hadn't been doing that very long.
I will have to find out what, pressure valve and how they adjusted it for future knowledge in case it pulsates in the future I guess.
Only found out that Hymers from people on here, have submersible pumps last year.
I would like to know why some van makers use submersible pumps with micro switched taps?, surely they are more likely to give trouble than a straight forward tap,and an inline flow sensor for all outlets?
Looking forward to being educated on that issue.
Les

 

[DaveandJen]

Not necessarily, pressure and flow aren't connected.
Shurflo do a 20psi 7ltr/min pump and a 30psi 7/ltr min pump

Pressure and flow are very much connected. Without the pump performance curves to hand showing the outputs of both pumps at given head pressures (caused by restrictions in the delivery pipework by things such was hot water heater coils, valves, and pipework size) its impossible to state the improvement in flow between the 20 and 30 PSI pumps but generally speaking the pump producing 30PSI with the same flow as the 20PSI pump will provide a higher pressure and flow in the shower and at the taps than the 20PSI pump because the pump generates a higher head (pressure) which will overcome the delivery pipe loss better.

 

[PeteH]

The end result (at the shower head say) depends for a given (Pump) pressure and flow on the friction losses due to the pipework and fittings. Simply, Longer and more convoluted is less efficient. It is unlikely though that fitting a 30psi rated pump would increase the likelyhood of failure, most of the plumbing material used in recreational vehicles is good for 100psi. though some fittings might be suspect at that pressure.