Definitely these things work immensely better w a reservoir. I’ve always wondered if you could use glycol instead of water to avoid the evaporation….
Run closed loop with an overpressure relief valve like a hydronic boiler does and you shouldn’t have hardly any evaporation if you don’t have any leaks
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Duh. That is a great idea!
If you don’t know what you’re doing, or don’t have time to learn, hire a plumber who specializes or at least understands hydronic heating applications…Joe the plumber is gonna look at you like you’re batshit most times.
(Or maybe that’s just me? 
)
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