The key here is constant vs intermittent use. One can't expect to come up for a weekend, where you have the house at 40, and expect it to reach 70 quickly. Radiant hot water is mixed more with cold and runs at even a lower temp than hot water baseboard, so it will take longer to make up a large heat differential. Like LB said, I know no one that uses it year round at a constant temp who doesn't rave about it...
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