Weil-McLain Oil-Fired Water Boiler (w/ Burner Natural Draft)

This durable, cast‑iron three‑section Oil-Fired Water Boiler is engineered to deliver dependable hydronic heating for residential applications. Part of the trusted Gold S4 series, it is known for its long service life, quiet operation, and stable, efficient combustion. Designed as a packaged solution, this model includes a factory‑installed oil burner that is precisely matched to the boiler’s firing rate, ensuring clean, consistent performance right out of the box. With natural‑draft chimney venting, this Oil-Fired Water Boiler serves as a straightforward replacement option for older atmospheric oil boilers, making it ideal for retrofit installations where venting modifications are not desired.

The three‑section cast‑iron heat exchanger provides even heat transfer and exceptional thermal stability, helping maintain efficiency over years of operation. With a heating capacity of 133,000 BTU and an 86% AFUE efficiency rating, this boiler offers reliable comfort for medium‑to‑large homes while keeping maintenance simple. A service‑friendly layout gives technicians easy access to the burner, controls, and piping connections, reducing installation and service time.

Quiet operation is supported by Weil‑McLain’s combustion chamber design and the inherent sound‑dampening qualities of cast iron. For homeowners seeking a dependable, mid‑capacity oil boiler that integrates seamlessly with existing chimney venting, this packaged Gold S4 model delivers long‑term performance and proven reliability.