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Peerless 63 series "L" boilers
Peerless makes two versions of their 3, 4 and 5 section 63 series boilers, one with an "L" in the model number and one without. (See the ratings chart, below.) The "L" versions have lower energy input and output than their counterparts and are slightly less efficient.
Looking at the replacement parts for each leads me to guess that the "L" boilers have fewer burners than their counterparts, but I don't see any description of what the differences are in their literature. The "L" boilers are only about $100 less, so you're definitely paying more per BTU and getting a slightly less efficient boiler, so I'm wondering what the upside is, other than potentially getting a boiler that more closely matches your radiant load. Would a boiler tend to last longer with a smaller fire under it? Would it be even less efficient to use an oversized (by about 75 ft.²) boiler?
I'm also wondering if it's possible to upfire an "L" boiler if I decided to add another radiator or two somewhere down the road by ordering the replacement burner assembly and gas control for the non-"L" version.
Does anyone have any experience installing both versions of these boilers?
Just another DIYer | King of Prussia, PA
1983(?) Peerless G-561-W-S | 3" drop header, CG400-1090, VXT-24