Good points above. If this is for a weekend home where you want to drop the heat down during the week, I'd not use radiant. It takes a long time to raise the temp even a few degrees, so it may not be beneficial. On the other hand, if you use an efficient gas boiler such as a Buderus, you might just be able to leave it at a constant temp all week long without a substantial cost differential vs oil, etc. Something to think about if you ever plan to move to the house full time.
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