Heat Pump vs Oil Burner: What We Chose for Our Garage Heater

I'm the office administrator for a 12-person manufacturing company. I handle all equipment ordering—roughly $45,000 annually across 7 vendors—and I report to both operations and finance. So when we moved into a new facility in March 2024, the garage heater decision landed squarely on my desk. After four weeks of research, contractor visits, and a few late nights, I want to share what I learned comparing a Riello oil burner against a heat pump for our 3,600 sq ft workshop.

And if you're starting this search with "heat pump vs ac" articles, I'd gently suggest you step back first. I nearly made that mistake myself.

The Comparison Framework

A heat pump is, mechanically, an AC unit with a reversing valve: it can move heat in either direction. So yes, a heat pump does everything an AC does, plus heating. That's why the standard answer to "heat pump vs AC" is "heat pump." But that advice assumes the heat pump has enough capacity for your building. In a drafty, uninsulated commercial garage, that assumption falls apart.

Our comparison was never just heat pump vs AC. It was really between two heating strategies:

• A ductless heat pump system (two 24,000 BTU heads), which handles cooling in summer and attempts heating in winter.
• A Riello 40-series oil burner with a new forced-air furnace—a dedicated heating system that happens to be one of the most common oil burners in the Northeast.

I compared them on four dimensions: upfront cost, operating cost, cold-weather performance, and service availability. The last one is the one most comparison guides leave out. It's also the one that mattered most.

Dimension 1: Upfront Cost

Both quotes came in during April 2024 from licensed local contractors:

• Ductless heat pump (two 24,000 BTU heads): $12,400 installed, including electrical panel work.
• Riello oil burner (40-series, with a new furnace unit): $9,800 installed, including oil tank inspection and new supply lines.

The oil burner was about 21% cheaper before the first operating hour. If I remember correctly, that spread is fairly typical for commercial garage heater installations in our region, based on the three contractor quotes we collected.

When I first started managing vendor relationships back in 2020, I assumed the lowest quote was always the best choice. Three budget overruns later, I know that's a trap. But this time, the upfront math genuinely favored the Riello system—and that wasn't the only surprise.

Dimension 2: Operating Cost

Here's where the heat pump fought back hard.

Based on EIA data, heating oil in the Northeast averaged $3.12 per gallon during winter 2024–2025 (Source: EIA Weekly Heating Oil and Propane Prices, accessed January 2025). Electricity averaged $0.24 per kWh in our state as of December 2024 (Source: EIA Electric Power Monthly).

Doing the math for our heating load: the Riello burner, at 140,000 BTU input and roughly 80% efficiency, burns about 1.6 gallons per hour. That's $4.99/hour to run. Wait, let me double-check that: 1.6 × $3.12 = $4.99. Yes, just under five dollars an hour. The heat pump, at 48,000 BTU total capacity, draws roughly 4 kW. At $0.24/kWh, that's $0.96/hour.

I ran these numbers multiple times because the gap looks absurd. The heat pump is roughly five times cheaper to operate. Over a four-month heating season, I estimated $2,900 in oil for the burner versus roughly $650 in electricity for the heat pump.

That operating cost advantage is real. To be fair, that's why so many people default to recommending heat pumps—in a well-insulated building, the numbers genuinely do the talking. The question is whether the heat pump can handle the heat load at all. Which brings me to the third dimension.

Dimension 3: Cold-Weather Performance

I went back and forth between the heat pump and the oil burner for almost three weeks. On paper, the heat pump made sense: five times cheaper to run, built-in summer cooling, no fuel deliveries. It checked all the right boxes until we calculated the actual heat loss of our building.

Our garage is cinder block, uninsulated, with two 14-foot overhead doors. Running the Manual-J heat load calculation with the contractor, we needed roughly 72,000 BTU/hour at 10°F outdoor temperature—or rather, that was the calculation number. On a windy night, the real number is probably higher.

The two-head heat pump maxed out at 48,000 BTU/hour. That means it would run at 100% capacity all winter and still struggle to keep the garage above 50°F. Meanwhile, the Riello oil burner's furnace delivers about 112,000 BTU/hour output. In December 2024, we did a test run: outdoor temp 38°F, garage at 38°F, and the Riello system brought it to 60°F in 45 minutes.

The surprise wasn't that the oil burner was more powerful. It was that the "efficient" heat pump would have to work at absolute maximum the whole winter just to produce lukewarm air in that drafty space.

Could we have bought a bigger heat pump? Sure. But the contractor's quote for a four-head system was over $18,000. At that price, the operating cost advantage evaporates. You're paying 80% more upfront for a system that still works near its limit during cold snaps.

That's the nuance most "heat pump vs AC" content misses. It's written for suburban homeowners with insulated houses. It doesn't apply to a commercial garage where the doors open twenty times a day. At least, that's been my experience in southern New England with uninsulated commercial buildings.

Dimension 4: Service Availability—The Factor Most Comparisons Leave Out

This is the part that should matter most to a purchasing manager, and it's the part that almost no comparison article addresses until someone gets burned.

When I searched "riello burner service near me" in January 2025, I found four certified Riello technicians within 25 miles of our facility. The heat pump manufacturer's installer map showed two certified technicians in our entire state, both more than 40 miles away.

I called both sides with the same question: "If this system fails during a cold snap, when can you be here?" The heat pump contractor said they were booking two to three weeks out in peak season. The Riello service tech said, "I guarantee 48-hour response in winter, and I stock igniters, electrodes, and pumps on the truck."

I only believed in the value of guaranteed service after I ignored it once. In February 2024, a vendor who promised "probably next week" left us waiting 11 days for a repair. The disruption—delayed tasks, staff working from home, a failed expense report—cost us far more than an expedited service call would have.

In my opinion, the $480 we paid for an after-hours Riello service call in March 2025 (the igniter went) wasn't an expense. It was the price of time certainty. The tech arrived in 26 hours and fixed it on the spot. If the garage had been down for even five days, we would have delayed $18,000 in outbound shipments. The $480 bought speed, and more importantly, it bought the certainty that speed would happen.

That, right there, is why brand and service networks matter in a way that spec sheets can't capture. It's not about brand loyalty. It's about not being the office administrator who explains to the VP why the workshop is freezing for two extra weeks.

What We Chose

We installed the Riello oil burner in March 2025, and the first three months of real operation cost us $1,850 in heating oil—holding the garage at 60–65°F through two weeks of single-digit overnight lows. The only repair was an igniter replacement at $480. All-in, first-year ownership ran roughly $10,280 including installation, fuel, and service.

If the heat pump had worked as projected, those three months of operation would have cost about $650 in electricity. But the load calculation said it couldn't hold temperature. I don't doubt the $650 number—I doubt the assumption that anyone would be happy with a 48°F garage in February.

I wouldn't say the oil burner is "better" than a heat pump. It was better for our specific building—uninsulated, cold-climate, high air leakage, and a need for fast temperature recovery after overhead doors open and close. That's a narrower verdict than most articles give you, but it's an honest one.

Which Should You Choose?

Here's a practical breakdown I'd give anyone deciding between these two systems:

Choose a heat pump if:

• Your space is reasonably insulated (R-19 walls or better).
• Winter lows stay above 25°F in your area.
• You also want cooling in summer—this is the one place "heat pump vs AC" is easy: heat pump, every time.
• You can live with slow warm-up after overnight setbacks.

Choose an oil burner (Riello or equivalent) if:

• You have a large uninsulated workshop or garage.
• Doors open regularly and you need fast heat recovery.
• Winter temperatures drop below 10°F.
• It's possible to find local certified service—search "[your brand] burner service near me" before buying.

And if you're researching outdoor heaters: that's a different category. For loading docks and open patios, electric radiant heaters are usually the low-maintenance choice. But if your "outdoor" space is semi-enclosed and used for production, a small oil-fired unit heater is worth asking about. Our Riello tech quoted $3,900 installed for a 60,000 BTU unit in April 2025.

Final Thoughts

Comparison shopping for commercial heating is not like buying a consumer appliance. It's about the whole package: upfront price, operating cost, physical reality of your building, and—above all—service availability when things break. The "heat pump vs AC" framing is a fine starting point for homes. For commercial garages and workshops, expand the comparison before you spend five figures.

Prices in this article come from quotes in our region (southern New England), gathered March 2024 through May 2025. Fuel and electricity prices are EIA data from December 2024 and January 2025. Verify current rates before you commit—prices move.