I have read at least a dozen threads about connecting a small tank water heater in-line with the tankless to buffer out cold spikes. I have not yet plumbed a return line for the recirculation pump. Should I wait until I run the return line and activate the recirculation pump, and then assess the performance, or install the tank now? If I install the tank, should I put it in series or parallel. Just to clarify, the sole purpose of the tank will be to buffer out cold spikes. In series, the tank will be supplied with hot water from the tankless, and will, hopefully, run sparingly. In parallel, it will be part of the supply. If I do put it in parallel, should I install a ball valve to regulate the volume of water I pull from the tank? I don't want to install point of use heaters. Thanks. Also, I made the mistake of posting on "Plumbing Zone," not realizing it is a forum for professionals. My ego still hurts.