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@dwassner Check the user manual or service manual for a description of each setting. I assume the offset helps avoid nuisance cycles in some installations. Also, That setting might be more applicable in a cascade/multi-boiler situation. Perhaps the manual will give more insight.

I’m guessing it was always this way but perhaps you never knew it because no one ever ran them at the same time. If you turn off the kitchen faucet I’m assuming that the hot would return to the shower, yes?

You’re not insane for wanting it. I think your biggest challenges will be budget, especially if you’ll want A/C, followed by finding a good designer/installer, followed by convincing others that you’re not insane. If you go for it, take time vetting the designer and installer. Don’t settle on...

How did you decided on the configurations (length, spacing, size, zone) of the pex runs before having heat loss data? Both boilers are oversized for your heating needs - I think you know that. I assume that the 222-f is your choice of boiler because of the domestic hot water but you didn’t...

I guess you can’t use real baseboard along the outside wall, either, right? My concerns would be (1) plumbing in an exterior wall or (2) if the interior wall were load bearing and I couldn’t get through, say, a 2x header, or other structural framing. Edit: oh you’re not going into a second...

It looks like your expansion tank is valved off of the system by that green handled ball valve. That valve, if it is between the air vent and the expansion tank, must be open for the tank to accept any expansion. Also, it looks like the pipe that connects the air vent to the expansion tank...

As others have suggested it is difficult if not irresponsible to comment on the price; instead, we might be able to help you determine if your quoted equipment is appropriate and help you feel better about the installer you choose. How did your installer decide on a 55,000 btuh boiler? Did the...