Weil-McLain 383600330 - SlimFit SF550 Direct-Vent Hot Water Gas Boiler, 93.9% AFUE
Weil-McLain 383600330 - SlimFit SF550 Direct-Vent Hot Water Gas Boiler, 93.9% AFUE
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The Weil-McLain SlimFit SF550 direct-vent hot water gas boiler, part number 383-600-330, is engineered to supply reliable hydronic space heating. Built with a durable fire-tube configuration, this heating unit provides a rated input capacity of 550,000 BTU. It operates as a high-efficiency heat source designed to circulate heated water throughout closed hydronic piping loops.
Gas-fired hot water boilers generate thermal energy by burning fuel and transferring combustion heat directly to system water across heat exchanger surfaces. The direct-vent configuration allows dedicated intake of outdoor combustion air and exhaust venting, isolating the combustion process from internal room air while maintaining steady operating parameters.
Key Performance Features:
- Heating Capacity: Delivers a 550,000 BTU heating capacity to meet hydronic system requirements.
- Thermal Efficiency: Achieves a 93.9% AFUE thermal efficiency rating for optimal fuel utilization.
- Fire-Tube Construction: Features a fire-tube body design engineered for robust heat transfer to circulating water.
- Direct-Vent Configuration: Designed for direct-vent air intake and flue exhaust piping.
Application: Weil-McLain SlimFit SF550 gas-fired hot water heating equipment. Confirm the part number against your existing part or unit, or send your model and serial number to National Boiler Supply to verify before ordering.
| Performance Parameter | Engineering Baseline Value |
|---|---|
| Manufacturer Part Number (MPN) | 383-600-330 |
| Model Designation | SlimFit SF550 |
| Heating Capacity | 550,000 BTU |
| Thermal Efficiency | 93.9% |
| Body Construction | Fire-Tube |
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