New problem in our area . 3rd time this week the water pressure is very low . Because of the low pressure the water does not get to the flat plate collecter . The water circulation pump switches on when water difference is more than 7 degrees between geyser and collector and keeps on running because no water is circulating . What worries me is that the pump will get damage and the collector heat up to 115 C . I switch of the system to protect the pump . This causes the geyser to cool down and when the pressure is back the water is cold . What is the best solution . Do have a 0.4 kW pump and Eco water tanks .

I'd put a pressure pump on it... but that is my first knee-jerk thought :-)

I'd do the same than plonkster, including a pressure sensor to activate or not the pump.

The pressure pump is a good idea . I would like it to be from my rainwater system or secondary  source because it also happens often that there is no water . Would like some ideas stopcock or one way valves to get it running . Went of grid with the Axpert to keep the electric worker alive on the pole , can't pump my dirty water into the counsel water. ??

2 hours ago, Javi Martínez said:

including a pressure sensor

Most of the pumps sold around here will generally come with the extra little diaphragm protection unit on top, which usually already includes a one-way valve and a pressure switch. So that's a solved problem that you can buy in the hardware store.

Separating the supplies is a bit more complex. The proper valve you're supposed to use, one with what is called an "air gap", is quite expensive.

31 minutes ago, plonkster said:

Most of the pumps sold around here will generally come with the extra little diaphragm protection unit on top, which usually already includes a one-way valve and a pressure switch. So that's a solved problem that you can buy in the hardware store.

Separating the supplies is a bit more complex. The proper valve you're supposed to use, one with what is called an "air gap", is quite expensive.

Ok, if the pump includes It, it's easier.

1 hour ago, Javi Martínez said:

Ok, if the pump includes It, it's easier.

They sell little pump kits, at least where I live (we're in the middle of a big drought, worst in about 300 years) for connecting tanks and things to your house. It usually comes with one of these:

 

 

Normally you also want one of those pressure tank bladder things so the pump doesn't turn on and off too frequently.

Thanks for the info Plonkster . We have a Afgri shop in town that stock pumps and water equipment . Waiting for a filter from Eco depot , then I can start to instal . The geyser wise system can operate with a 12 volt DC pump or 220 volt AC . I have a 12 volt pump installed . There is a 5 Amp 220 volt pump connecting point in the connection box . Will check tomorrow if I can use both at the same time . If I can it will be an easy electric installation . No water for the last few hours and won't have water tomorrow .

Hi Chris

I have a similar setup but have not experienced this problem.  I think this is due to having a one-way valve installed on the cold-water inlet to the Geyser.

The circulation pump gets the cooler water from the "bottom" of the geyser and pumps it through the collector and then back into the geyser - so should only fail if the geyser is almost empty?  It may also be worth checking that the mesh strainer/filter is not partly blocked - my filter needs to be cleaned every few months.

Hi Nigel the system is fitted with one way valves on the hot and cold lines . There is also loops installed if a valve should fail .The system works fine as long as it is full of water . If a tap is opened while the pressure is low and some of the water in the pipes run out the pump keeps on running but does not circulate water . As soon as there is pressure and the system is full it is fine again .Thanks for your replie . The rainwater supply is now fitted , just waiting for the filter and pressure control . The joys of a small town .Wait for everyting