SGO
Oil Steam Boiler Series 4

Features

Optimized System

Oil-fired steam boiler with cast iron sections and tankless heater opening

High Capacity

Has large water content for longer steaming times

Venting Options

Two flue outlets- rear and top – for complete venting flexibility

Reliability

Includes service switch and Weil-McLain exclusive captured elastomer seals for added reliability

Easy Access

Quick open top and swing-away burner door with full chamber access increase visibility for inspection and servicing

thoughtful Design

Recessed target wall design protects unit from flue brushes

Energy Efficient

85% AFUE

Flexible Install

Available assembled or as a knockdown for installation areas with limited space

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B100 Certified Oil Boilers

Sustainable Heat for a Changing World

Weil-McLain SGO oil boilers are now B100 Certified, delivering reliable performance while supporting renewable heating. When used with approved Carlin and Beckett oil burners, our boilers are certified to operate with up to 100% biodiesel, giving homeowners and contractors a dependable, efficient solution that’s built for today and ready for the future.

Technical Specs

MODEL	AHRI BURNER CAPACITY (GPH)	INPUT RATING (MBH)	DOE HEATING CAPACITY (MBH)	AFUE	NET AHRI STEAM RATINGS (MBH)	STEAM (SQ. FT.)	TANKLESS HEATER INTERMITTENT DRAW RATING (GPM)	DRAFT LOSS THROUGH BOILER (IN. W/C)	CHIMNEY SIZE RECTANGULAR (IN.)	CHIMNEY SIZE ROUND (IN.)	CHIMNEY SIZE HEIGHT (FT.)	APPROX. SHIPPING WEIGHT (LBS.)
SGO-3	0.95	133	114	85%	86	358	3.25	0.02	8×8	6	15	600
SGO-4	1.2	168	144	85%	108	450	3.5	0.01	8×8	6	15	705
SGO-5	1.45	203	174	85%	131	546	3.75	0.015	8×8	7	15	820
SGO-6	1.75	245	210	85%	158	658	4	0.015	8×8	7	15	920
SGO-7	2	280	240	85%	182	758	4	0.015	8×8	8	15	990
SGO-8	2.3	322	266	–	200	833	4	0.025	8×12	8	20	1090
SGO-9	2.55	357	295	–	221	921	4	0.03	8×12	8	20	1195