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Re: Help Sizing A Multi-Zone Mini Split System - Minimum Capacity?

https://forum.heatinghelp.com/discussion/comment/1861610#Comment_1861610

Mitubishi has an app note specifically to address this issue but only nerd would read that.

https://mylinkdrive.com/viewPdf?srcUrl=http://s3.amazonaws.com/enter.mehvac.com/DAMRoot/Original/10009%5CApplication%20Note%201036%20ME%20-%20Applying%20MXZ-C%20Multi-Zone%20Systems%20-%2020190110.pdf

If you do go with a multi, make sure to ask wired or wifi remotes for it. This at least allows you to program in fan off in cooling and heating which fixes some of the comfort issues.

Kaos

Re: boiler replacment opinion on the West Coast

Viessman is considered top of the line if you have someone who knows how to service them. To me tankless water heaters are problematic.

EBEBRATT-Ed

boiler replacment opinion on the West Coast

I’m a home owner and am looking for some opinions to cross reference the bids of installers. Many seem to steer me to a boiler and tankless water heater. My triangle tube solo boiler for heat and my Takagi 3 tankless water heater for DHW needs to be replaced soon so I’d appreciate some feedback. I live on the coast of San Francisco. My house has staple up floor hydronic heating zones and the walls are insulated with R13 and floors and ceiling at R30. I’ve done a rough total house heat loss calculation of 35K. We have 2 full time residents but run a regularly booked Airbnb frequently with 4 guests

In looking back and with current research it seems my installer did not account for the value of stored thermal mass even though I have a decent size mechanical room.

Now that gas and electricity costs are much higher, I’m thinking of going with a Viessman Vitodens 200 boiler, 80 or 120 gal Vitocell 300 indirect tank for DHW. I’m also considering 2-3 solar thermal panels now or in the future. I'm mainly interested in the Viessman for the integration and ease of installation even though it's more expensive.Any thoughts or advice would be appreciated.