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So I finally ordered an ITS EV tube collector and need some info from people who have installed EV tubes before.  My Questions:

1. SR81 or Geyserwise controller? - SR81 claims to be better, but more expensive.

2. 12V or 220V pump? - Worried about pump not working during load shedding or cloudy days.

3. Anti Siphon Loop? - Should these still be installed if there is non-return valves already installed.

Any help is appreciated.

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Don't know witch is best .  The Geyser wise system have a 7Ah 12 volt back up battery for times when there is no electricity . The pump is rated 7.5 Watt . The battery should last a few hours . On cloudy days the pump does not really work .

I have installed flatpanel and EV tubes and instal the non - return valve  on the cold water pipe just after the pump . I also install anti shipon loops on hot and cold water pipes . I heard of people battling with pump if not done like this .

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8 hours ago, wimmelman said:

2. 12V or 220V pump? - Worried about pump not working during load shedding or cloudy days.

I opted for a 12V pump [not a Geyserwise system, and with a flatplate collector]. It works fine on clear days, totally independent of loadshedding, and on cloudy days there's not much solar heating anyway. What I don't like is that I can't switch it off when I'm away, say on summer holidays. Maybe Geyserwise have thought of that.

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8 hours ago, wimmelman said:

1. SR81 or Geyserwise controller? - SR81 claims to be better, but more expensive.

I prefer SR81, In my case I buy them for cheaper than the GeyserWise

8 hours ago, wimmelman said:

2. 12V or 220V pump? - Worried about pump not working during load shedding or cloudy days.

I use 12 volt on systems without backup power and 220volt on systems with backup power. 

8 hours ago, wimmelman said:

3. Anti Siphon Loop? - Should these still be installed if there is non-return valves already installed.

Yes, the anti siphon loop is to prevent the heat from escaping from the geyser to the Flatplate at night, heat will only creep upwards and the anti siphon loops on the input and output prevents this. 

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