Hot Water Boiler WGO-4 Series 3 High Efficiency Cast Iron Oil Fired 147 MBH With Tankless Heater Opening WM-386701014

The Hot Water Boiler WGO-4 Series 3 High Efficiency Cast Iron Oil Fired 147 MBH With Tankless Heater Opening (WM-386701014) delivers a 147,000 BTU input and rugged cast iron heat exchanger construction for long-lasting hydronic heating performance. The three-pass design promotes clean, efficient combustion when paired with a Beckett burner and provides improved thermal transfer for residential hot water systems. The WGO-4 includes tapping locations for a tankless coil, circulator, relief valve, low-water cutoff and system supply and return piping. With stable operation across varying draft conditions, the boiler supports high-temperature hydronic loops and domestic hot water production. Technicians benefit from service access to cast iron flue passages, burner mounting surfaces and control interfaces, making the WGO-4 a durable and maintainable oil-fired heating solution.