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Author Messages Oldest First Newest First dennismedeiros Registered Users Posts:10 11/16/2007 6:36 PM   Hi to All, This post is also on the solar forum.  we need all the expertise we can get. I have never seen this topic discussed but I am sure it has been solved many times over.  Attempting to find the best (cost effective) way of adding solar to an existing hydronics system.  The system is a straight forward boiler (Slant/Finn) to slab hydronics arrangement.  It has one main pump driving 6 slab zones which are activated by separate zone control valves whenever there is a call for heat. The system will turn on the boiler if necessary. What I want to do is augment the heating system so that when solar energy is available during the day heat will be added to the slab so that it will minimize the amount of heat required from the boiler.  The system uses glycol throughout and is currently separate from the hot water system.  Might be replacing old water heater as well. One can place a heat exchanger in line with heating loop (before or after boiler ??) and have solar heat flow whenever there is a call for heat.  If you do that then how do you avoid stagnation ?  Planning to use evacuated tube collectors (glycol, we are in cold area) One can divert heat to a heat dump or just load up the slab during the day.  This may require an over ride to existing thermostates?  Not sure what the best options are.  Any ideas ??  Please help.  Thank you in advace. Dennis
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