Which Diaphram Water Pump?

[OldAgeTravellers]

The submersible water pump on our Hymer failed and the replacement I found in Portugal is not really up to the job. Only 12lpm rather than 20lpm of the original. I have already converted the van to a pressure system which is much better than the expensive micro switches in the taps, but on my return will install a proper diaphram pump, which I know will make my pressure switch redundant as they have an integral one.
I had a Shurflo on my last van which was excellent but have seen a SEAFLO in a Chandlers here in Portugal for €89 euro which looks very similar to the Shurflo and comes complete with fittings strainer etc.
Does anybody have any experience of the Seaflo ones I get the impression from searching that the Seaflo is used more in the marine world and the Shurflo more in the Motorhome world but could be mistaken.
It may be a little dearer here as I have found the Shurflo ones on flea bay for around £60 but postage to France where we live would wipe out the difference.
I just want to make sure it is a good product from someone with experience on here.
The current draw I know is higher so I would switch it with a relay to save the wiring.
The other thing is do the diaphram pumps need the non return valve or is that implicit in the diaphram system.
Steve

 

[pappajohn]

Only thing I can say is the design of the pump incorporates a none return function.
It's not a valve as such but the design of the multiple pump valves serves the same purpose... IE: if the inlet is open the outlet is closed and visa versa and maintains back pressure in the system when the pump isn't running.

 

[OldAgeTravellers]

Only thing I can say is the design of the pump incorporates a none return function.
It's not a valve as such but the design of the multiple pump valves serves the same purpose... IE: if the inlet is open the outlet is closed and visa versa and maintains back pressure in the system when the pump isn't running.

Thanks PPJ, I suspected such but having not had one apart so thought I would ask. Saves another restriction.
Although I do use a pressure system I made to effectively drain down so it may be worth putting one on the high pressure side.
Steve

 

[TinaLes]

Hi AtOldAgeTravellers, sorry dont know your real name
Is the Seaflo Marine Pump similar to this? If so it will be well up to the job and could even be quieter than The Shreflow.
I can never get my head around why Hymer use submersible pumps, a lot of funsters seem to suffer with either poor pressure of failed tap micro switches. Problems you dont need on a long duration trip.
Hope this helps, I would defo fit as this make are used as bilge pumps which have to take a lot of stick running dry at times.
Les

Amazon product ASIN B01N64VJIQ

 

[two]

I think Lilie is the parent company of Shurflo pumps, which are branded as other names in other countries. Maybe the Seaflo is Portugal’s equivalent.

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[tacr2man]

Looks like Seaflo is a Chinese copy of Shurflo , in a review of one of their pumps by solar engineer the electric motors are not as heavy duty as shurflo . So you pays your money etc HTSH

 

[OldAgeTravellers]

Hi AtOldAgeTravellers, sorry dont know your real name
Is the Seaflo Marine Pump similar to this? If so it will be well up to the job and could even be quieter than The Shreflow.
I can never get my head around why Hymer use submersible pumps, a lot of funsters seem to suffer with either poor pressure of failed tap micro switches. Problems you dont need on a long duration trip.
Hope this helps, I would defo fit as this make are used as bilge pumps which have to take a lot of stick running dry at times.
Les

Amazon product ASIN B01N64VJIQ

Yes that's it exactly. I agree Les the taps & water pump is probably the worst part of the Hymer. I thought the Seaflo pump looked better made than Sureflo.

Looks like Seaflo is a Chinese copy of Shurflo , in a review of one of their pumps by solar engineer the electric motors are not as heavy duty as shurflo . So you pays your money etc HTSH

As above Tacr2man the Seaflow looks a bit better made and if it is Chinese they are actually a bit more expensive. Actually quite a few Chinese things I have bought have been very good quality and it says it can run dry which is a plus and it is five chamber rather than the three of Sureflo. So as I can get it off the shelf I think I will take a chance.
Thanks for the input.
Steve

 

[Lenny HB]

Has your Hymer got a pump isolation switch Steve? As Hymer never used to fit them until recently and with a pressure system it's essential.
I actually like the submersibles mainly because if they fail it's quick and easy to fit the spare I carry.

 

[JJ]

As Hymer never used to fit them until recently

Ummmm.

They fitted one in my 1987 Hymer 660S...

Even gave you a warning light to let you know when it was on.

JJ

 

[OldAgeTravellers]

Has your Hymer got a pump isolation switch Steve? As Hymer never used to fit them until recently and with a pressure system it's essential.
I actually like the submersibles mainly because if they fail it's quick and easy to fit the spare I carry.

Hi Lenny, It didn't originally but I fitted one and a relay to cut the pump off when the engine is running and a micro switch operated by the frost dump so as to protect the pump if the water dumps. The submersible was a bit limited on pressure struggling to get an adequate flow through the Nature Pure filter. Which is why I want to fit a proper pump. One of those, "one thing leads to another" jobs.
Out of interest, now I have changed the settings on the Battery Monitor it now closely reflects the Schaudt panel reading. The trouble is the gels take so long to soak and reach float voltage with limited sun. Three days rain here in Lagos.
Steve

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[OldAgeTravellers]

Duplicate Post

 

[OldAgeTravellers]

Has your Hymer got a pump isolation switch Steve? As Hymer never used to fit them until recently and with a pressure system it's essential.
I actually like the submersibles mainly because if they fail it's quick and easy to fit the spare I carry.

Hi Lenny, It didn't originally but I fitted one and a relay to cut the pump off when the engine is running and a micro switch operated by the frost dump so as to protect the pump if the water dumps. The submersible was a bit limited on pressure struggling to get an adequate flow through the Nature Pure filter. Which is why I want to fit a proper pump. One of those, "one thing leads to another" jobs.
Out of interest, now I have changed the settings on the Battery Monitor it now closely reflects the Schaudt panel reading. The trouble is the gels take so long to soak and reach float voltage with limited sun. Three days rain here in Lagos.
Steve

 

[OldAgeTravellers]

Duplicate Post

 

[OldAgeTravellers]

Duplicate, sorry

 

[hilldweller]

but on my return will install a proper diaphram pump

Steve

OK, we did have a cable failure on the microswitch in our Burstner, one in over 10 years. But the diaphragm pump we now own is horrible be comparison, load of burrrrrrps all night.

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[two]

OK, we did have a cable failure on the microswitch in our Burstner, one in over 10 years. But the diaphragm pump we now own is horrible be comparison, load of burrrrrrps all night.

Switch it off,
or fit an accumulator.

 

[DaveandJen]

Diaphragm pumps normally work best when a non return valve is fitted to the pump outlet to provide a more prositive seal and stop the sometimes unnecessary short term running of the water pump trying to keep the water system up to pressure. If you can install a small pressure vessel (accumulator) in the system all the better and most of the later motorhomes visited recently have them fitted.

 

[hilldweller]

Switch it off,
or fit an accumulator.

Go for a pee in the night and have to fumble for the pump switch - no way.

We did have a faulty pump, now cured, but no silent pees in the night.