Hello all, After posting a thread about my hot water solar control dilemma, some of you mentioned a DDC instead of a PLC because of the simplicity of what I am trying to control: a few sensors and valves and a circulating pump all controlled by temperature readings and differentials. As far as DDC's go I am lost, can anyone point me in the direction of a very basic (and hopefully reasonably priced) DDC and where to get it? I am not trying to automate a building here just control a solar setup. Thanks in advance for any help!