Following this thread with great interest. The super insulated passive solar addition(a winter zone core) to my retirement cabin will have a thermal mass hydronic floor for the first floor and basement(larger w/sand bed) as it's main heat storage so DIY hydronics is of interest to me(building will be 75% DIY, getting older). I have come across a couple of radiant dealers that sell DIY "kits". Still want enough knowledge of "how to" to understand/adapt system to my best needs. Also still researching best/economical way to charge mass(other than passive already planned) with minimal "sysytems". KISS. Backup demand should be very small. Lucky to be building from scratch and can design for radiant.
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