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Boiler Setup for 5 Zone Baseboard
I'm looking to replace my 40 yr. old Peerless oil fired boiler. My main interest is improving efficiency of the system.
Current boiler is 130,000 BTU/hr rated, and cycles frequently based on heat calls from each of the 5 zones. Slant-Fin calc says my heat loss is ~60,000 BTU @ 10F (Maryland) so i'm probably 2X oversized on the boiler and also based on that calc i have 2-3X the required baseboard length in every room except 1 that is a little short (vaulted ceiling, 2 sets of older french doors to exterior and adjacent to un-conditioned garage). I currently have no outdoor reset or any fancy controllers.
I did replace the two original 1/4HP circulators with Taco 007e's which are amazing but thats somewhat beside the point.
DHW is handled separately although my existing system has a tankless coil. I don't need DHW from the boiler with the new system.
After browsing the forum here for a bit it seems like the setup I have is very inefficient, especially in terms of the zones. Ideally (I think) I'd like to see a system where the boiler keeps a hot water buffer tank at a temperature controlled by an outdoor reset and the zones draw from the tank rather than the boiler. Then the boiler only focuses on keeping the tank at the set point. That seems like a reasonable way to increase the system mass sufficiently to reduce the short cycling from randomly timed zone calls.
It seems like that is an atypical setup. Does the forum have any thoughts or guidance on how to get a better boiler setup in my case?