Controlling solar boiler with arduino

Controlling the solar boiler with arduino, relais shield, DS18S20 and a LCD. Three measurements: solar collector, solar boiler and an extra 1000 liters solar boiler.
1) When the solar collector is warmer ( x °C) then the solar boiler, pump is starting to heat the water in the solar boiler.
2) When the solar boiler reached 60°C then the 3-way valve will shift and the 1000 liters solar boiler will be heated.
With the help (software) of Tom Van Der Auwera
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