In fairness to all, we don't discuss pricing on the Wall. Thanks for your cooperation.
Two-Stage firing on WM 580
I thought I would put out a question to the pros on here, or anyone else who might happen to have the experience.
Has anyone tested out the efficiency of a two stage gas burner operating in a WM 80 series boiler. I am considering setting the low fire setting at about 60% of the boiler normal capacity. (There really is a rational reason) I'm running an orificed system. Future plans are to reactivate and restore the steam system in the garage and chauffer's apartment which was shut off about 25 years ago. Also need the two stage function if the heat is shut off in some of the rooms, etc. Need to be able to control at 8 oz, plus or minus 2 oz.
I am considering a Weil-McLain 580 with a Riello 40-G900 gas 2-stage. Ya, I know that WM doesn't show that burner for the 580, just the 680. But, WM said to ask Riello if it is comparable to the single stage burner specd for the 580. Riello said it's the same burner except for adding 2-stage firing and that it's applicable firing range is exactly the same as the Riello burner that WM calls out for the 580.
Presently running on a 37 year old Pennco atmospheric. Rated input is 1,050,000 BTU. Firing at about 550,000 BTU. Ya, I know it's got a ton of excess air and the efficiency is horrible. The age plus the oversize is the reason for changing out.
Thoughts and comments will be greatly appreciated.
Dave in Quad Cities, America
Weil-McLain 680 with Riello 2-stage burner, December 2012. Firing rate=375MBH Low, 690MBH Hi.
System = Early Dunham 2-pipe Vacuo-Vapor (inlet and outlet both at bottom of radiators) Traps are Dunham #2 rebuilt w. Barnes-Jones Cage Units, Dunham-Bush 1E, Mepco 1E, and Armstrong TS-2. All valves haveTunstall orifices sized at 8 oz.
Current connected load EDR= 1,259 sq ft, Original system EDR = 2,100 sq ft Vaporstat, 13 oz cutout, 4 oz cutin - Temp. control Tekmar 279.http://grandviewdavenport.com