10 checks before you turn the heating on: safety first, savings second

If you have one free hour tonight and time for only one technician visit during the week, do not start with the energy bill. Check the things that could become dangerous first, then the problems that could leave you without heat on a cold day, and only then move on to efficiency settings.

Not every home has the same heating system. A boiler, heat pump, air conditioner, radiator system and portable heater all have different maintenance needs and risks. If a check does not apply to your system, skip it.

How this Top 10 is ordered

The order follows three questions:

1. Could this create a risk to people or a fire risk? That comes first. 2. Could a small problem now turn into a heating failure on a cold day? That comes second. 3. Could a setting or minor correction reduce avoidable heat loss? That comes after safety and reliability.

There is no opaque points score or formula-driven “winner”. The reason behind each position matters more than the number.

1. Check the heating appliance and the route for combustion gases

Highest priority for fuel-burning heating. If you use a gas boiler, stove, fireplace or another combustion appliance, look for visible damage, unusual smells, soot, poor draught or an obviously blocked opening. Do not dismantle gas fittings, burners, flues or electrical components unless you are qualified to do that work.

Bulgarian fire-safety guidance stresses that heating appliances should be used as intended and that smoke and combustion products need a safe route outside. For fuel-burning systems, a professional pre-season check is far more useful than attempting a risky home repair.

You can do: a visual check for obvious problems and clear access around the appliance. Call a technician: for unusual operation or smells, signs of combustion problems, a flue/chimney concern, or whenever the manufacturer requires servicing.

2. Check smoke alarms and carbon-monoxide (CO) detectors if your home has them

An alarm does not repair a heating system, but it is a separate layer of protection. Test it according to the manufacturer's instructions and check for error or low-battery indications. Do not invent your own placement rule; follow the device instructions and the requirements that apply where you live.

A home without fuel-burning appliances has a different CO-risk profile. This article therefore does not import a universal detector-placement rule into the Bulgarian context without a directly applicable local requirement.

3. Move combustible items away from heaters

A cardboard box, blanket, drying rack or piece of furniture moved during the summer may now be too close to a heater. This is one of the fastest checks with an immediate safety benefit.

Bulgarian fire-safety guidance warns against keeping combustible materials near heating appliances or using appliances for purposes they were not designed for. For a portable electric heater, also inspect the power lead, stability and the instructions for that specific model.

4. Check the filter and airflow — if your system has a filter

This matters for air conditioners, heat pumps and other systems that depend on airflow, but it does not apply to every boiler or radiator system. The U.S. Department of Energy notes that a dirty or clogged filter can restrict airflow and make a heating system work harder and longer.

Clean or replace a filter only as the manufacturer directs. If airflow remains unusually weak, the system becomes noisy or it repeatedly shuts down, the problem is no longer just “a dirty filter”.

5. Look at accessible vents, ducts and grilles

Before the season starts, check that visible grilles and openings are not blocked by furniture, textiles or stored items. With a combustion system, an obviously obstructed air inlet or flue is a reason to stop and seek competent help rather than experiment.

The goal here is inspection, not dismantling the system.

6. Run the heating before the first genuinely cold evening

Do not wait until the weather is already cold and service companies are overloaded. Run the system through a short normal cycle while you have time to observe how it starts and whether it reaches the set temperature.

Watch for unusual noise or smell, error codes, leaks, or frequent on-off cycling. A single test does not prove that the system is technically sound; it can simply reveal an obvious problem before heating becomes urgent.

7. Review the thermostat schedule and settings

After summer, the schedule may no longer match your routine. Check the clock, day/night temperatures and periods when nobody is at home. If your system and lifestyle support scheduled control, there is little value in heating an empty home exactly as you heat an occupied one.

We do not promise a universal percentage saving. The result depends on the building, weather, heating system and household habits.

8. Look for obvious draughts around doors and windows

This is a low-risk check that needs no specialist tools. Look at seals and places where you can clearly feel cold air entering. The European Commission includes keeping heated air indoors and reducing draughts among sensible winter energy-preparation measures.

Start with safe, reversible actions such as correcting or replacing a visibly damaged seal. Do not turn this into a promise about the savings from a full energy renovation.

9. Check radiators or heat delivery where relevant

With a hydronic heating system, check whether radiators warm up normally and reasonably evenly. A persistent cold area, unusual noise or visible leak deserves attention. Bleeding is appropriate for some systems, but do it only when you know it is correct for your installation and can follow the proper procedure.

With an air conditioner or heat pump, observe airflow and heating performance instead.

10. Decide what you will do if the main heating fails

This is not a disaster-survival exercise. It is five minutes of practical preparation: save the service contact, know how to switch the system off safely, and decide how you would temporarily heat one room if the main appliance failed.

Never use a barbecue, generator or other fuel-burning equipment designed for outdoor use as improvised indoor heating. If your backup is a portable electric heater, use it only as instructed and keep combustible materials away.

If you have only one hour tonight

Start with the safety checks that do not require dismantling anything: clear the area around heaters, test existing alarms according to their instructions, inspect visible openings and the filter, run the heating through a controlled cycle and review the thermostat. Then arrange service if anything suggests a combustion, flue, electrical or abnormal-operation problem.

That is more useful than beginning with small efficiency tweaks and leaving a potentially serious problem for the first cold week.

Which checks apply to your system?

• System: Gas boiler / stove / fireplace · Most relevant checks: 1, 2, 3, 5, 6, 10
• System: Heat pump / air conditioner · Most relevant checks: 3, 4, 5, 6, 7, 8, 10
• System: Radiators / hydronic system · Most relevant checks: 6, 7, 8, 9, 10 plus checks for the heat source
• System: Portable electric heater · Most relevant checks: 3, 6, 10