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  #1  
Old 22-05-2018, 22:38
teatimetraveller teatimetraveller is offline
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Default Pump/ water heater problem

Hi everyone, I'm new to this forum. I joined as we've just moved into a caravan whilst we build a house. We are off grid and have a weak spring water supply which we collect in a tank and pump into the caravan with a small 24v pump which seemed to work well until we got the gas converted to LPG. The flow rate for the pump is 12ltr/min but the water heater only lets 5ltr/min through. This causes the pump to shut off as the pressure builds up. The pressure then drops, the pump starts up and so on. This is obviously not good for the pump and I guess will burn the pressure switch up. Any ideas on a solution.
Thanks in advance...
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Old 23-05-2018, 07:27
DavidE DavidE is offline
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to the forum. I hope someone can help with this. The only obvious answer( question) is would a less powerful pump balanced to the heaters flow rate do the trick?
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Old 23-05-2018, 07:46
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parkandleisure parkandleisure is offline
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The one thing you have not provided us with is the pressure of the pump you have. We sell many of the water heaters to run on pumps either 12v or 24v. If you can advise of the pressure on the plate of the pump i can advise you further.
Also what length of pipe are you running from the tank to the pump and pump to the caravan. Sometimes you need to fit an expansion vessel to hold a constant pressure to stop cycling.
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Old 23-05-2018, 08:20
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edders edders is offline
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Quote:
Originally Posted by parkandleisure View Post
The one thing you have not provided us with is the pressure of the pump you have. We sell many of the water heaters to run on pumps either 12v or 24v. If you can advise of the pressure on the plate of the pump i can advise you further.
Also what length of pipe are you running from the tank to the pump and pump to the caravan. Sometimes you need to fit an expansion vessel to hold a constant pressure to stop cycling.
As an ex narrowboater, this is a normal occurrence but I don't know what make of pump you have. Most boats with a 12v or 24v systems use pumps like a Jabsco31395-0 294 or similar (depending on the number of outlets etc) which evens out flow and does not neccessarily need an accumulator. Cycling does not affect it. On my boats, I always had an accumulator and the pump would always cycle when only one or two outlets were in use. Having an accumulator is also useful if a water leak develops on the high pressure side as you will hear the pump periodically start up to repressurise the accumulator..

Hope this helps?
Tony
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Old 23-05-2018, 11:02
Mosquito Mosquito is offline
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to the forum.

It looks as if you send the information required, one of the above will be able to help.

Good luck.
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Old 23-05-2018, 12:22
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parkandleisure parkandleisure is offline
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Quote:
Originally Posted by edders View Post
As an ex narrowboater, this is a normal occurrence but I don't know what make of pump you have. Most boats with a 12v or 24v systems use pumps like a Jabsco31395-0 294 or similar (depending on the number of outlets etc) which evens out flow and does not neccessarily need an accumulator. Cycling does not affect it. On my boats, I always had an accumulator and the pump would always cycle when only one or two outlets were in use. Having an accumulator is also useful if a water leak develops on the high pressure side as you will hear the pump periodically start up to repressurise the accumulator..

Hope this helps?
Tony
An accumulator is the same as expansion vessel just under a different name.
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Old 23-05-2018, 13:29
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edders edders is offline
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Quote:
Originally Posted by parkandleisure View Post
An accumulator is the same as expansion vessel just under a different name.
Yes, I realise that. Just force of habit I suppose.
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Old 25-05-2018, 19:32
teatimetraveller teatimetraveller is offline
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Hi

Thanks for the responses. We have a Flojet Quad pump which moves 12ltr/min which is a problem as the heater only allows 5 ltr min through. Unfortunately there is a bypass valve in the pump which means an accumulator tank is not an option. I assume that either we need to get a smaller pump with possibly an accumulator tank or get a bigger water heater. I guess the first option is the cheapest? On another note if we leave the pump switched on, every 5-10 mins the pump activates without an outlet being opened. Would this suggest there is a small leak making the pressure drop?
Thanks in advance,
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Old 25-05-2018, 19:38
teatimetraveller teatimetraveller is offline
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Quote:
Originally Posted by parkandleisure View Post
The one thing you have not provided us with is the pressure of the pump you have. We sell many of the water heaters to run on pumps either 12v or 24v. If you can advise of the pressure on the plate of the pump i can advise you further.
Also what length of pipe are you running from the tank to the pump and pump to the caravan. Sometimes you need to fit an expansion vessel to hold a constant pressure to stop cycling.
So the pump closes at 36psi. From the tank to pump its less than a metre and pump to inlet is under 3. The pump only cycles when we open the hot water outlets. and very briefly every 5-10 mins if all outlets are closed.
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