Why a waste oil heater needs a yearly cleaning
Burning used oil leaves ash behind. Over a season, ash and soot build up on the heat exchanger and in the flue, nozzles and filters collect residue, and the burner slowly drifts out of adjustment. The heater keeps running, but more of the heat goes up the flue instead of into the bays, and the odds of a lockout on a cold morning go up.
EnergyLogic says waste oil heaters need annual maintenance to prepare for heating season, and ash removal at regular intervals1.
How often: once a year, and by the hour meter
Plan on one full service every year, before the heat comes on. For a heater that runs hard, the hour meter matters too. EnergyLogic schedules maintenance after about 1,000 heating hours1, and its heaters include a digital hour meter that tracks runtime4.
| When | What to do |
|---|---|
| Before heating season | Full annual service: clean, replace wear parts and test-fire |
| Around every 1,000 heating hours | Maintenance and ash removal, per EnergyLogic |
| Regularly through the season | Drain water from the tank and keep the area around the heater clear |
| Any time | Call for service if you see smoke, soot, oil or lockouts |
What a full annual service covers
EnergyLogic's maintenance procedures and service guidance cover the whole system, not just the burner2, 3:
- Heat exchanger and combustion chamber cleaned and the ash removed
- Flue pipe and exhaust stack cleaned and inspected
- Nozzle assembly cleaned and the nozzle replaced
- Preheater cleaned
- Fuel oil filter changed and the filter basket cleaned
- Compressor air filter replaced
- Blower cleaned
- Burner fired and the flame checked before the heater goes back into service
EnergyLogic sells an annual maintenance kit that includes the nozzle and the air filter3, and its swing-away burner opens the combustion chamber so the cleaning itself takes about 30 minutes2.
A full cleaning and combustion tune-up, burner service, repairs and replacement parts, and a safety and efficiency check. We service EnergyLogic and Clean Burn heaters and boilers, and we book cleanings ahead of the heating season.
Book a cleaningWhy to book it before it gets cold
EnergyLogic recommends servicing a waste oil burner while the weather is still warm2. The heater has to be down during service, and EnergyLogic recommends that the building have a secondary heat source for when the heater is down for maintenance3. A cleaning in early fall means the heater is ready before the first cold morning.
Check the hour meter when you book. It tells the technician how hard the heater worked last season and whether it needs more than the standard service.
Keep the waste oil clean
A heater can only burn as clean as the oil you feed it. EnergyLogic heaters burn used oils from No. 2 to 90 weight, including synthetics1. A few habits keep that fuel clean:
- Keep solvents out of the waste oil. Under EPA rules, used oil with more than 1,000 ppm of total halogens is presumed to be hazardous waste6. Chlorinated solvents, such as some brake and parts cleaners, can turn a whole tank of used oil into hazardous waste.
- Keep antifreeze, gasoline and water out, and stick to the fuels the manufacturer lists.
- Drain water from the tank. Water and contaminants settle to the bottom, and EnergyLogic tanks include a drain valve to purge them5. The fuel pickup sits six inches above the bottom so only oil reaches the burner4.
The federal rules also limit what a shop heater can burn: your own used oil and used oil from household do-it-yourselfers, in a heater rated at 0.5 million BTU per hour or less, vented outside6. Our waste oil heater page covers those rules.
Signs a heater needs attention now
Don't wait for the annual service if you notice any of these. Shut the heater down and call for service:
- Smoke or soot at the flue or around the heater
- The burner failing to light, or locking out
- Oil collecting where it shouldn't, or a strong oil smell
- Noticeably less heat than usual, or the heater short-cycling
Common questions
How often should a waste oil heater be cleaned?
At least once a year, before heating season. EnergyLogic also calls for maintenance after about 1,000 heating hours, so a heater that runs hard all winter may need ash removal partway through the season.
How long does a cleaning take?
On an EnergyLogic heater, the swing-away burner opens the combustion chamber for cleaning in about 30 minutes. A full annual service also covers the nozzle, filters, preheater, blower and flue, so plan on the heater being down for longer than that.
Can we do the cleaning ourselves?
The owner's manual lays out the procedures. A trained technician can also set up the burner and catch worn parts during the same visit. At a minimum, keep the tank drained of water and the area around the heater clear.
Do you service Clean Burn heaters too?
Yes. We clean, tune and repair EnergyLogic and Clean Burn heaters and boilers, whoever installed them.
Can we burn used oil from our customers?
Under the federal on-site rule, a shop heater can burn the used oil you generate and used oil from household do-it-yourself oil changers, not oil from other businesses.
Sources
- EnergyLogic, Waste Oil Heating FAQs
- EnergyLogic, Don't Wait Until It's Cold: Service Your Waste Oil Burner in the Summer
- EnergyLogic, Installation and Operation Manual, Model 75H (maintenance procedures)
- EnergyLogic, Waste Oil Heaters: key features
- EnergyLogic, EL 140H waste oil heater (fuel gauge and drain valve)
- U.S. EPA, 40 CFR Part 279, Standards for the Management of Used Oil
This guide is general information, not legal advice. Follow your heater manufacturer's instructions and your state and local rules.