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Different take on tankless vs buffered
Any opinions on how contractors bidding on my small-house remodel can reach such wildly different conclusions on tankless vs. buffered mod cons for combined heat-and-hot-water install? FYI, depending on insulation TBD, Manual J indicates 23k-33k MBTU/hr on coldest night and someone will very likely want a hot bath that night so I figure another 30k MBTU for DHW, based on experience with existing DHW tank. I can give more details if you wish.
Traditional radiant contractors: Smallest available boiler+buffer+indirect will avoid cold water sandwich and avoid short cycling in shoulder season. I get that.
Full-service heating-plumbing contractors: With high enough BTUs (150k MBTU/hr), tankless avoids cold water sandwich, and vendor will honor warranty for any reliability problems due to shoulder season short cycling. That's supposed to give me confidence that tankless reliability won't be a problem. I'm open to what they say but...
I don't get it...if shoulder season short cycling isn't a problem with tankless, then why would a boiler need a buffer?
Viessmann installers in SF Bay area, feel free to contact me via my profile page re whole house remodel