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European style panel radiators and cast iron on same zone?
Can Runtal baseboard or panel radiators be installed on the same zone as cast iron radiators? My contractor's plumber says no; manufacturer says yes.
We are renovating and the structural changes have resulted in a need for new radiators in 2 upstairs bathrooms, the 1st floor lav, and the kitchen (which will be heated by toekick fan convectors). My contractor's plumber plans on putting the kitchen fan convectors and 1st floor lav (i.e. Runtal baseboard) on a new zone. However, he doesn't think it's a good idea to put Runtal in the upstairs bathrooms on the same zone as the remainder of the house (cast iron) and doesn't think it's worth the cost/effort to separately zone the upstairs baths.
The structural changes don't allow the old cast iron radiators to fit anymore (large header now in wall).
I have a 1930's home with a hydronic system. The system seems to have been originally gravity hot water, but converted to a single circulator in the 50's (probably when they added a small addition heated with cast iron baseboards. Most of the other radiators in the house are Arco convectors.
Can the Runtal baseboards or panel radiators be combined on the same circulated zone as the old cast iron radiators and if so what 'fudge' factors should we consider in calculating sizing? (water temp currently set at 190 at the Peerless 175k boiler)