A robust four‑section cast‑iron oil‑fired water boiler engineered for dependable hydronic heating and long service life. The AO‑4E features an ECM circulator for reduced electrical consumption, smoother operation, and improved system efficiency. This packaged model includes a factory‑installed burner and is configured for chimney venting, making it an ideal replacement for older atmospheric oil boilers. The less‑tankless design is optimized for systems using an indirect water heater or dedicated domestic hot‑water solution.
Performance and design
Four‑section cast‑iron heat exchanger provides strong heat output, stable operating temperatures, and excellent durability.
ECM circulator reduces power draw while delivering consistent, quiet water circulation.
Factory‑installed oil burner (Beckett, Carlin, or Riello depending on configuration) tuned for clean, efficient combustion.
Chimney‑vented configuration supports straightforward replacement in existing flue systems.
Less tankless coil setup ideal for pairing with indirect water heaters for higher DHW performance and efficiency.
Quiet, low‑vibration operation supported by the Advantage series’ combustion and airflow design.
Service‑friendly layout with accessible burner, controls, and piping connections.
Where it fits best A high‑capacity, chimney‑vented oil boiler for homes needing reliable hydronic heat and planning to use an indirect water heater rather than a tankless coil.
