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Christopher Anderson

Delta-T Hardwired AC Differential Temperature Controller

Written December 20, 2009

Delta-T Hardwired AC Differential Temperature Controller

I replaced a 25 year old controller for my solar hot water heater here in Florida. Direct replacement and worked with out any changes to the system other than replacing the electric valve. I hope it will last another 25 years.
I did add a light to show when ever its on which is nice to know when it is working even on a cloudy day. I also added a heater strip to prevent freeze up which has burst tubes twice even with 2 thermal drain valves.

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