How to clean baseboard heaters, electric or hot water

Step by step: how to clean baseboard heaters, electric or hot water

Safety first. Turn electric baseboard heaters off at the circuit breaker, not just the thermostat, and wait until they are completely cool. Wear safety glasses while blowing dust out. Never spray liquid into the heater, and keep curtains, furniture and anything that can burn well away from it.

1. 1

   Turn off the power and let it cool

   Turn the thermostat down, then switch off the heater’s circuit at the breaker panel. For hot water baseboards, turn the thermostat down. Wait at least 30 minutes, until the cover and fins are cool to the touch.

2. 2

   Put on glasses and clear the area

   Put on safety glasses and a dust mask, tie back long hair, and move furniture and curtains away. Lay an old towel on the floor in front of the heater to catch what falls.

3. 3

   Vacuum around and under the heater

   Vacuum the floor in front of the heater, the gap underneath and the wall above it with the crevice tool. Pet hair and dust bunnies here get drawn into the heater every time it runs.

4. 4

   Remove the front cover if your model allows

   Many covers lift up and pull out, or are held by a couple of screws; check your manual. If the cover does not come off easily, leave it on and clean through the vents at the top and bottom.

5. 5

   Vacuum the fins gently

   Run the soft brush attachment along the length of the fins, not across them, so you do not bend them. The fins are thin aluminum and bend with very little pressure. Use a thin brush to reach dust between fins and pull it toward the vacuum.

6. 6

   Blow out the trapped dust

   Use a shop vacuum’s blower or a hair dryer on the cool setting to blow out dust the brush cannot reach, working from one end to the other. Vacuum up the dust that lands on the floor afterward.

7. 7

   Wipe the cover and end caps

   Wipe the cover, end caps and top surface with a cloth dampened in mild soapy water, then dry them. If the cover is off, you can wash it in the sink. Make sure everything is completely dry before it goes back on.

8. 8

   Straighten bent fins and reassemble

   If some fins are flattened, comb them straight gently with a fin comb so air can pass through. Replace the cover, turn the breaker back on, and run the heater for a few minutes to check for odors.

Electric vs. hot water baseboard heaters

Both types have fins that collect dust, and both are cleaned with a vacuum and a brush. The difference is the power: electric heaters must be shut off at the breaker, while hot water (hydronic) heaters only need to be cool.

Cadet’s cleaning guide for its electric baseboards says to put on safety glasses, tie back loose hair and clothing, always turn off the breaker, blow the heater out with a shop vacuum or a hair dryer, then wipe dust off the top and vacuum the floor around it. Cadet recommends cleaning out baseboard heaters at least every two years; homes with pets or heavy dust benefit from doing it every fall.

Clearances and fire safety

Keep curtains, bedding, furniture and paper away from baseboard heaters, and never block the airflow. Dust and lint on the elements are a smaller risk than fabric pressed against a hot heater, but both are worth avoiding.

• The US Fire Administration notes heating is the second leading cause of home fires and advises keeping anything that can burn at least 3 feet from heat sources such as space heaters and radiators.
• Your heater’s manual lists its own minimum clearances for drapes and furniture. Follow those, and keep long curtains tied back or hemmed above the heater.
• Do not put rugs, toys or laundry on top of or in front of a baseboard heater.
• If a heater sparks, smells of hot plastic, or the cover discolors, turn it off at the breaker and have it checked by an electrician.

Why baseboard heaters smell when you first turn them on

A dusty, slightly burnt smell the first time you run the heat each fall is usually dust burning off the elements. Cleaning the fins before the season mostly stops it.

If the smell lasts more than a short while after cleaning, or smells like melting plastic, switch the heater off and check for something touching it. To keep dust down between deep cleans, E-Cloth suggests dusting and vacuuming around baseboard heaters weekly, with the heater cool and off. Dusting the baseboards in the same session catches what falls.

Mistakes to avoid

• Turning off only the thermostat on an electric heater instead of the breaker.
• Brushing across the fins and flattening them, which blocks airflow.
• Spraying cleaner into the heater or onto the element.
• Cleaning a heater that is still warm.
• Pushing furniture or long curtains back against the heater after cleaning.