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re-piping an old rad system...
I'm looking at a re-pipe job involving an old Victorian-era home heated with cast-iron rads. The system is currently all one zone. I'm re-zoning so that the system has either:
-one zone per room
-one zone per floor (3-5 rads per zone)
I'd like the zoning to be a bit more user-friendly.
Has anyone re-piped a system this way before? I'm looking at a one-zone-per-rad scenario using 1/2" wirsbo HePex to/from each rad, controlled by either a zone valve or a dedicated small circulator.
I wonder, though, will such small zones cause short-cycling of the boiler? It is a non-condensing, cast iron oil fired boiler with domestic immersion coil.
If short cycling could be an issue, I will instead pipe it with one zone per floor (that's 3-5 rads per zone).
In this case I'll pipe reverse/return, or maybe get my hands on some monoflo tees. Not really common around here
My main question is, will the one-zone-per rad setup work, or will there be problems?? Haven't done it before with old cast-iron radiators. Panels yes, cast rads no.