| No it has not been discontinued However most stocking distributor/wholesalers have stopped carrying and stocking this model due to its unpopularity. The GV touts an 87% efficiency and it requires Cat III venting which gets quite expensive if going over 8-10’ in length. Besides this it has an internal circulator that wastes a tremendous amount of capacity recirculating through a thermostatic valve to prevent condensing in a cast iron product. Because of this typically on a good install the piping should be primary/secondary which forces the installer to put in as a minimum one more circulator. If you look at their product line, it falls between an 84% (CG) and a 93% (Ultra).
For a few points of efficiency, it is not cost effective to install the GV with the venting costs and higher price of unit. This combined with a HSI ignition system; the potential for other problems has always plagued this boiler. If it was me, I would not put this boiler in. This model which was at the top of the efficiency class, dates back to about 1987. Many better boilers have been introduced since then. As long as we are on boilers and the aluminum block Ultra has been mentioned, I wouldn’t install one of these either. The Ultra has been troubled in the past with the US higher temps that we design around. Besides the block have issues with unbalanced water, eroding the waterways and burning a hole in the condensate drain area. The higher temps that we run our systems at, unlike Europe where these were derived from with low operating radiant temps, the block and seals are not holding up here. Ask your guy if he uses the Triangle Tube Prestige boiler. You won’t go wrong with this self cleaning Stainless Steel Modulating and condensing boiler with outdoor rest. | 
