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Subject Topic: Low Pressure Pump Post Reply Post New Topic
23/11/2018 at 10:42am
 Location: Norfolk
 Outfit: Burstner 500TS castleton HL Roamer
View callam9774's Profile View Profile   Reply to callam9774 Reply   Quote callam9774 Quote  
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Hi! I need to replace the Whale Evenflow EF0615 low pressure on board water pump in a 1991 Casteleton Caravan. The pump links to a Carver Cascade GE 2 water heater that " must have a pumped cold water input pressure not exceeding 20 p.s.i. (1.4 bar). A pressure of approximately 10 p.s.i. (0.7 bar) is recommended."

                           The Shurflo Trail 7 20 p.s.i. model seems to be the best replacement but the 1.6 bar pressure still seems a little high for the heater. My question is can the pressure on the Shurflo be adjusted? Would the Fiamma 20 psi pump be a better bet? Any help please?

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Callam9774


23/11/2018 at 11:49am
 Location: Lichfield
 Outfit: Coachman Amara 450
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I think any water pump designed for a caravan will be okay. The one with the higher flow rate will be better especially if you have a shower which is required for a good water flow. When they advise not to have a water pressure exceeding 20 psi. I think they may be referring to connecting directly up to a water mains which some people now do for convenience.


23/11/2018 at 1:49pm
 Location: East Herts
 Outfit: 1992 Elddis Wisp 450CT + X Trail
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Some pumps designed for caravans and boats do have a higher pressure. I had one on my boat that supplied water at 45 psi. With a half-inch bore hose fitted directly to it, it would send out a jet of water over 20 feet!

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Best Regards,
Colin


23/11/2018 at 6:44pm
 Location: None Entered
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that would be a bilge pump i would guess.. mine would do the same..

caravan pumps are different kettle of fish.. cheap motors embedded in a plastic housing.. made to look fancier than they really are..

trog


23/11/2018 at 6:57pm
 Location: East Herts
 Outfit: 1992 Elddis Wisp 450CT + X Trail
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Quote: Originally posted by trog100 on 23/11/2018
that would be a bilge pump i would guess.. mine would do the same..

caravan pumps are different kettle of fish.. cheap motors embedded in a plastic housing.. made to look fancier than they really are..

trog



No it wasn't a bilge pump, my bilge pumps had a much larger bore. The 45 psi pump was my fresh water pump, feeding the taps in the galley and toilet/shower compartment. When fitted in place the water came out of the taps with the same sort of force as the mains water at home.

-------------
Best Regards,
Colin


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23/11/2018 at 6:59pm
 Location: East Herts
 Outfit: 1992 Elddis Wisp 450CT + X Trail
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Quote: Originally posted by Colin21 on 23/11/2018
Quote: Originally posted by trog100 on 23/11/2018
that would be a bilge pump i would guess.. mine would do the same..

caravan pumps are different kettle of fish.. cheap motors embedded in a plastic housing.. made to look fancier than they really are..

trog



No it wasn't a bilge pump, my bilge pumps had a much larger bore. The 45 psi pump was my fresh water pump, feeding the taps in the galley and toilet/shower compartment. When fitted in place the water came out of the taps with the same sort of force as the mains water at home.

My caravan uses a small submersible pump which probably has no more than 4 or 5 psi I would guess.







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Best Regards,
Colin


via mobile 24/11/2020 at 3:57pm
 Location: 
 Outfit: None Entered
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This is not correct. The pressure maximum is due to the units having pressure release valves. If you have a too powerful pump it will just empty the system and make the water system not work.

You need to find the lower pressure water pumps. They are quite hard to get hold of. Also a pressure switch inline with a more powerful pump may also work.


24/11/2020 at 4:11pm
 Location: East Herts
 Outfit: 1992 Elddis Wisp 450CT + X Trail
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I think they've probably got it sorted by now as this post is nearly 3 years old.


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Colin


via mobile 24/11/2020 at 4:13pm
 Location: 
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I’m having the same problem with a 1982 Cotswold Windrush with a carver cascade mk1.

The more powerful pump just dumps the water.

I’m waiting on a lower pressure pump to hopefully sort it out.

🙏🏼


24/11/2020 at 4:27pm
 Location: East Herts
 Outfit: 1992 Elddis Wisp 450CT + X Trail
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I have the Carver cascade mk2 in my caravan, and I use a submersible pump in a water container outside and that seems to work fine. Not sure what the difference is between the mk1 & mk2, but I don't think there's much. I presume you have an inboard tank?


-------------
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Colin


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25/11/2020 at 12:32am
 Location: Lichfield
 Outfit: Coachman Amara 450
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Quote: Originally posted by Colin21 on 24/11/2020
I have the Carver cascade mk2 in my caravan, and I use a submersible pump in a water container outside and that seems to work fine. Not sure what the difference is between the mk1 & mk2, but I don't think there's much. I presume you have an inboard tank?





The only difference I'm aware of between the Carver Cascade mk1 & mk2 is that the mk1 was gas operated only and the mk2 could be operated by either gas or mains electric which was indicated by the stamped letters on the heater (GE).





25/11/2020 at 2:48pm
 Location: East Herts
 Outfit: 1992 Elddis Wisp 450CT + X Trail
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Quote: Originally posted by tango55 on 25/11/2020
Quote: Originally posted by Colin21 on 24/11/2020
I have the Carver cascade mk2 in my caravan, and I use a submersible pump in a water container outside and that seems to work fine. Not sure what the difference is between the mk1 & mk2, but I don't think there's much. I presume you have an inboard tank?





The only difference I'm aware of between the Carver Cascade mk1 & mk2 is that the mk1 was gas operated only and the mk2 could be operated by either gas or mains electric which was indicated by the stamped letters on the heater (GE).



I didn't think there was much difference. Mine is a mk2, but is still just gas operated. I think the GE ones were a bit later.


-------------
Best Regards,
Colin



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