Offset Calc for Solar Radiant Systems [RE-wrenches]

[Jeremy Rodriguez]

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Wrenches,
While on the subject of SHW, does anyone have a quick way to calculate the savings of using solar with a radiant system. 
I have used a tankless water heater with a drainback system and coils to feed the floor and another to pre-heat the DHW side.  How about F-charts. Are they easy to write? I realize that location and 100 other variables are here, but I would like to provide a number to clients as to what they may be able to save.

Thanks in advance,
Jeremy
All Solar
CO, USA
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