Hi,
Every summer I get a few calls from annoyed hot water customers who can't stand hearing their boiler fire merely to keep the indirect tank up to setpoint temperature, when of course the solar preheat tank is at 160 degrees or better at mid-day. So what's the best way to transfer heat, in essence temporarily putting the tanks in parallel, from the solar tank to indirect? I can think of a few possibilities using a circulator and temperature controller, and a additional connection between the tanks, such as the tank drains plumbed together as a return line, but where is the best place to locate the circulator in a standard preheat arrangement (i.e. hot output of solar preheat plumbed to cold input of indirect tank)? Kirk Herander VT Solar, LLC dba Vermont Solar Engineering NABCEPTM Certified Inaugural Certificant NYSERDA-eligible Installer VT RE Incentive Program Partner 802.863.1202
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