Before the first cold night, check the boiler water level (steam) or pressure (hot water), look for leaks, confirm radiator vents and valves work, test carbon-monoxide alarms, and book annual service, especially for oil. Fire the system on a mild day so problems appear before you need the heat.
Technical Consideration
Fall startup checklist
| Check | Steam | Hot water |
|---|---|---|
| Water level / pressure | Sight glass about half full | Typically 12–20 psi cold |
| Vents | Radiator and main vents open and clear | Bleed air from radiators |
| Leaks | Check fittings and returns | Check valves, tank, and pump |
| Safety | Test low water cutoff (per manual) | Check relief valve for drips |
| Alarms | Test CO and smoke alarms | Test CO and smoke alarms |
When should I start the boiler?
On a mild day in September or October, before heat is essential.
That leaves time to get parts if something fails.
What should a service visit include?
Burner cleaning and adjustment, combustion testing, safety control checks, and for oil, nozzle and filter replacement.
Annual boiler maintenance typically runs about $200 to $500.
What should landlords document?
Service dates, CO alarm tests, and tenant notices.
Records help with rental inspections and liability.
Related services in Wilmington
- Boiler & Radiator Heat Tune-Ups in Wilmington, DE
- Boiler Repair in Wilmington, DE
- Oil Furnace & Oil Boiler Service in Wilmington, DE
- Multifamily & Property Manager HVAC in Wilmington, DE
Local verification resources
Before authorizing work, use the Delaware license lookup. For projects that may require approval, consult the City of Wilmington permit information or the authority serving the property.