twin coil indirect water cylinders

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i'm planning on installing a twin coil hot water cylinder, the second coil for a future solar installation. Should the boiler go the bottom coil and solar panel to the top or vice versa. Views and reasons why please. Also what about an option to put both coils in series
 
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The solar should go to the bottom coil. Hot water rises and this arrangement gets the most from the solar panels before the boiler tops up the heat.

If you put the boiler on the bottom coil, it would heat the whole cylinder and the solar would have nothing to do.

Until the solar is up and running, you could use both coils in series, with the water flowing through the top coil first.
 
Thanks for confirmation, it is what I expected but I wanted to make sure

Cheers

PS: any thoughts on this ACV "tank in Tank" system, (which seem to be prominent on this site) versus Standard Tank with heat exchange coils.
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PS: any thoughts on this ACV "tank in Tank" system, (which seem to be prominent on this site) versus Standard Tank with heat exchange coils.
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Not something I know about unfortunately - perhaps somebody else will be able to shed some light on the subject :cool:
 
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ACV cylinders are great for what they do, high volume,rapid recovery. When combined with solar we tend to use a preheat method of one feeding another.

Simond will be able to give you a more accurate account.

Be aware that the larger ones require massive heatload volumes from cold.recent 600litre tank in tank(not ACV) had a reheat figure of 40 something kW.
 
ACV cylinders are great for what they do, high volume,rapid recovery. When combined with solar we tend to use a preheat method of one feeding another.

Simond will be able to give you a more accurate account.

Be aware that the larger ones require massive heatload volumes from cold.recent 600litre tank in tank(not ACV) had a reheat figure of 40 something kW.

just take care with those if you get one. They can fail if drained down incorrectly.
 

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