A high‑capacity four‑section cast‑iron oil‑fired water boiler designed for strong hydronic output and dependable domestic hot‑water production. The AOT‑4E includes an ECM circulator for reduced electrical consumption and smoother system performance, along with a factory‑installed oil burner tuned for clean, efficient combustion. This model features an integrated tankless coil, providing on‑demand domestic hot water without the need for an indirect tank, and is configured for chimney venting for straightforward replacement of older atmospheric oil boilers.
Key Features
Four‑section cast‑iron heat exchanger engineered for high output, thermal stability, and long service life.
ECM circulator that lowers electrical usage while delivering quiet, consistent water circulation.
Factory‑installed oil burner (Beckett, Carlin, or Riello depending on configuration) matched to the boiler’s firing rate for clean, stable combustion.
Built‑in tankless coil providing reliable, on‑demand domestic hot water directly from the boiler.
Chimney‑vented design ideal for retrofit installations using existing flue systems.
Quiet, low‑vibration operation supported by the Advantage series’ combustion and airflow design.
Service‑friendly layout with accessible burner, controls, and piping connections for easier annual maintenance.
Ideal Applications
Homes needing a high‑capacity oil boiler that provides both hydronic heat and on‑demand domestic hot water through a tankless coil, especially where chimney venting is already in place.
