Oil-fired Boiler Sizing Home › Forums › Archives › Old Bulletin Board Archives › Oil-fired Boiler Sizing This topic has 0 replies, 1 voice, and was last updated 27 years, 11 months ago by Andrew Peterson. Viewing 0 reply threads Author Posts 1 Feb 1997 at 1:14 am #285678 Andrew Peterson I am interested in obtaining information and/or advice on how to properly size an oil-fired boiler for radiant in-floor heat. Author Posts Viewing 0 reply threads The forum ‘Old Bulletin Board Archives’ is closed to new topics and replies.