Sorry I should have gone into more detail. I'm currently working on a new build 40 flats with twin coil cyl in each flat and panels on roof. Personally I don't think the set up will work. Resol controller in each flat, sensor cables from panels brought down into each flat, pump connection on resol feeding overheat stat > feeding 2 port valve, orange of valve turns communal pump on roof. I think extending the sensor cables will be inaccurate, and the heat loss will be immense over those distances.
I just wondered if anyone on here has installed a similar system.
I think theres roughly 100 collectors, they worked it out just over 2 per flat. Also they've installed communal boilers, so I doubt the solar will get a chance to heat the tanks before the boiler does
But there are twin coil cylinders fitted as you state above.
Why would the solar not get a chance to heat up the the portion of the cylinder that it's coil is allocated too?
Because the boilers will be heating the cylinder 24/7 (until stat shuts off) so the majority of the tank will be heated by the boiler, and the recovery time will be so fast the solar won't get a chance
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