A rugged four‑section cast‑iron oil‑fired water boiler engineered for dependable hydronic heating in larger residential applications. The Gold S4 platform is known for its long service life, quiet operation, and stable combustion. This packaged model includes a factory‑installed oil burner and is configured for natural‑draft chimney venting, making it a straightforward replacement for older atmospheric oil boilers.
Key Features
Four‑section cast‑iron heat exchanger designed for strong heat output, even heat transfer, and long‑term durability.
Factory‑installed oil burner matched to the boiler’s firing rate for clean, consistent combustion.
168,000 BTU heating capacity suitable for larger homes or higher‑demand hydronic systems.
86% AFUE efficiency delivering reliable performance with simple annual maintenance.
Natural‑draft chimney venting ideal for retrofit installations without venting modifications.
Service‑friendly layout with accessible burner, controls, and piping connections.
Quiet operation supported by Weil‑McLain’s combustion chamber and cast‑iron block design.
Ideal Applications
A high‑capacity, packaged oil boiler for homes with existing chimney venting that need reliable, long‑term hydronic heating performance with a factory‑matched burner.
