A durable, cast‑iron three‑section oil‑fired water boiler engineered for reliable hydronic heating in residential applications. The Gold S4 series 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
Three‑section cast‑iron heat exchanger designed for even heat transfer, thermal stability, and long‑term durability.
Factory‑installed oil burner matched to the boiler’s firing rate for clean, consistent combustion.
133,000 BTU heating capacity suitable for medium‑to‑large homes.
86% AFUE efficiency delivering dependable performance with simple maintenance requirements.
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 reliable, mid‑capacity oil boiler for homes with existing chimney venting that need a packaged, burner‑included solution built for long‑term hydronic heating performance.
