Boilers and Cast-Iron Radiators After a Fire in an Older Home

A different kind of heating system

Plenty of older houses in and around Park Hill were built with a boiler in the basement feeding cast-iron radiators through the house, either with hot water or low-pressure steam. Some have since added forced air or been converted entirely, but many still rely on radiators, sometimes alongside newer equipment.

That matters after a fire. A radiator system has no ductwork, so smoke is not blown room to room through supply runs the way it can be with a furnace. On the other hand, radiator fins and the space behind decorative covers trap soot, the boiler and its flue need checking before use, and a house that sits without heat in a Denver winter can freeze the water-filled pipes quickly.

Immediate checks

Leave the gas supply to the boiler off if the utility or fire department shut it off. Only Xcel Energy or a qualified technician should restore it.
If the house will be without heat in cold weather, ask a plumber or heating contractor about draining the system or providing temporary heat.
Photograph radiators, the boiler, the expansion tank and visible piping.
Note any radiator or pipe near the fire that was exposed to direct heat.
Check that the boiler flue and chimney connection were part of the fire inspection if the boiler vents into an older chimney.

Getting radiators clean and working

Boiler service first.A heating contractor inspects the boiler, controls, relief valve and venting, and confirms it is safe to fire.
Pressure and leak check.Heat and firefighting can stress old joints and valves. The system is refilled and checked for leaks before rooms are refinished.
Radiator cleaning.Soot is removed from fins and surfaces with brushes, vacuums and cleaners suited to painted cast iron. Radiators may be removed for thorough cleaning during larger repairs.
Repainting with care.Many radiators carry old lead paint. Stripping or sanding them is lead-disturbing work, so ask about testing and methods before any refinishing.
Reinstall after walls and floors.If radiators were taken out for plaster or floor work, they go back after those trades finish, then the system is bled and balanced.

Questions for the heating contractor

Is the boiler safe to run, and what did you check to decide that?
Did any piping or radiators get damaged by heat, and does anything need replacement?
Should the system be drained while the house is unheated, and how will it be refilled?
Is the boiler venting into a chimney that also needs inspection after the fire?
Who is responsible for moving and reinstalling radiators if walls or floors are repaired?

General information for Park Hill, not a quote or professional advice. In an emergency, call 911.