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Well, that's quite embarrassing. It's actually a combi boiler. Can't spell anymore *sign*. Thank you, Dana, for your input. I learned about short cycling from your posts in this forum and on GBA in the first place. And it has been my understanding that I got a short cycling situation with combi...

I'm looking to replace my Rinnai tankless water heater that is used for hydronic heating (w/ wall-mount convectors) and domestic hot water. The system is open-loop so I want to use this opportunity to make it close-loop as well. Most of the contractors that came to estimate propose Navien combi...