A water heater system that includes a first water storage tank plumbed in series with a second water storage tank, and methods for controlling such a water heater system. A primary common pilot channel code sequence is generated by a CPICH code generator based on a reference cell identification signal and a frame start signal. The pixel includes a photodiode, a floating diffusion, a transfer switch which transfers the charge of the photodiode to the FD, and an amplification transistor which outputs a signal to a signal line in accordance with the potential of the FD. Each of the supports has a travelling distance the same as the others so that two adjacent spines are evenly separated. \u2014CO\u2014, or a single bond.