In winter, in an unheated garage, the engine starts with difficulty, the metal becomes covered with condensation, and your hands become numb after 10 minutes of work. But choosing a heating system for your garage is more difficult than it seems. It is important to take into account not only the climate, but also wall material, availability of electricity, regularity of use premises and even the type of substances stored (gasoline, oils, paints).
We analyzed 7 popular garage heating methods - from wood-burning stoves to modern infrared panels - and rated them on five key parameters: heating cost, heating rate, security, difficulty of installation and autonomy. In the article you will find not only comparative tables, but also calculation of the minimum heater power for a garage of 20 mยฒ at -20ยฐC, as well as checklists for preparing the premises for the winter season.
1. Wood and coal stoves: cheap but troublesome
Classic potbelly stoves and their modern counterparts remain the most common option for garages without electricity. Their main advantage is complete autonomy: no need to depend on interruptions in gas or light. However, there is also a downside: you will have to regularly prepare firewood, clean the ash and control the draft.
Modern type ovens "Buleryan" or "Breneran" They work on the principle of long burning (up to 8 hours on one tab), and their efficiency reaches 80โ85%. But even they demand minimum clearance 50 cm from the walls and mandatory ventilation. Otherwise, the risk of carbon monoxide poisoning increases significantly.
- ๐ฅ Pros: low fuel price, works without electricity, quickly heats the room.
- โ ๏ธ Cons: need a chimney, high risk of fire, requires constant monitoring.
- ๐ฐ Cost: stove - from 8,000 โฝ, installation of a chimney - from 5,000 โฝ.
โ ๏ธ Attention: If fuels and lubricants (gasoline, diesel fuel) are stored in the garage, the wood stove becomes extremely dangerous. Sparks or overheating can cause fuel vapors to ignite. In such cases it is better to choose water heating with closed boiler or electric heater.
2. Gas heaters: fast, but with limitations
Gas heat guns (eg Master BLP 17 M or Ballu BHG-20>) and infrared heaters (Timberk TGH) are able to raise the temperature in the garage in 15โ20 minutes. They are compact, do not require a chimney (for some models) and are suitable for rooms up to 50 mยฒ. However, there are two critical points here:
- Ventilation. When gas burns, moisture and carbon dioxide are released. Without fresh ventilation, mold will appear on the walls, and there will be a lack of oxygen in the air.
- Cylinders. One propane cylinder (50 l) is enough for 10โ12 hours of gun operation at medium power. It is inconvenient to replace it in the middle of the night, and storing several cylinders in the garage is dangerous.
For constant heating it is better to choose gas boilers with coaxial chimney (for example, Baxi Eco-4s). They are more expensive (from 30,000 โฝ), but safer and more economical than guns.
| Heater type | Gas consumption (l/h) | Power (kW) | Price (โฝ) |
|---|---|---|---|
| Heat gun Master BLP 17 M | 0.8โ1.2 | 10โ17 | 7 500 |
| Infrared Ballu BHG-20 | 0.5โ0.7 | 4.2 | 5 200 |
| Boiler Baxi Eco-4s | 0.3โ0.5 | 4.7 | 32 000 |
If you are using a gas heater, install gas leak sensor (for example, Astra-8120 for 2,500 โฝ). It will shut off the gas supply if the maximum permissible concentration is exceeded and will save you from an explosion.
3. Electric heaters: simple but expensive
Electricity is the most convenient heating method if the garage has 220V socket with grounding and the network power allows you to connect a load of 3โ5 kW. There are three types of electric heaters:
- ๐ Convectors (Noirot Spot E-3 1500) - heat the air evenly, are safe, but slowly warm up the room.
- ๐ก Infrared panels (Peony Thermo Glass P-10) - heat objects, not air, ideal for high garages.
- ๐ Heat guns (Ballu BKX-3) - heat up quickly, but burn oxygen and raise dust.
The main disadvantage is electricity cost. At a tariff of 5 โฝ/kWh, heating a garage of 20 mยฒ will cost 700โ1,200 โฝ/month (with round-the-clock operation at minimum power). To save, use thermostats (for example, Terneo PRO) and two-tariff meters.
โ ๏ธ Attention: Do not use oil radiators in the garage! Their body heats up to 90โ110ยฐC, and if tipped over, oil leakage and fire may occur. Only heaters with protection against dust and moisture (IP24 and higher).
Check the cable cross-section (minimum 2.5 mmยฒ for 5 kW)|Install a 30 mA RCD|Provide grounding|Cover sockets from dust|Use only heaters with protection class IP24+-->
4. Diesel and kerosene heaters: for emergencies
Solar heaters (Master BV 77 E) or kerosene (Sial Kero World) are often used in remote garages where there is neither gas nor electricity. They are compact, mobile and can work up to 12 hours on one tank (volume 10โ20 l). However, there are three critical points:
- Smell. Even with the correct settings, the smell of burnt fuel will be felt in the garage.
- Soot. With incomplete combustion, soot settles on the walls, which is difficult to wash off.
- Fire danger. Fuel is stored right in the garage - just one spark is enough.
Diesel heaters are not suitable for constant heating, but they are indispensable for emergency heating or repairs in the field. For example, Master BV 290 with a flow rate of 0.2 l/h it is able to maintain +10ยฐC in a 15 mยฒ garage all night.
How to reduce the smell from a diesel heater?
Use fuel with minimal sulfur content (Euro 5).
Add odorizing additives to diesel fuel (for example, Liqui Moly Diesel Additiv).
Install the heater close to the vent.
Clean the filter and nozzle regularly (every 50 operating hours).
5. Water heating: for permanent garages
If the garage is attached to the house or is used as a workshop, it makes sense to extend water circuit from the home heating system. This is the most economical method (if you have a gas boiler), but also the most expensive to install.
For an autonomous system you will need:
- ๐ฅ Boiler (gas, diesel or solid fuel).
- ๐ Circulation pump (e.g. Grundfos UPS 25-40).
- ๐ง Radiators (aluminum or bimetallic) or warm floor.
- ๐ ๏ธ Pipes (metal-plastic or cross-linked polyethylene).
The cost of turnkey installation for a garage of 20 mยฒ is from 80,000 โฝ. But with the right setup gas consumption will be 2โ3 times lower than that of a heat gun. For example, to maintain +15ยฐC in a 20 mยฒ garage, a 3โ4 kW boiler is sufficient (gas consumption ~0.3 l/h).
| System component | Cost (โฝ) | Service life (years) |
|---|---|---|
| Gas boiler Navien Deluxe 13K | 35 000 | 10โ15 |
| Circulation pump Grundfos UPS | 6 000 | 5โ8 |
| Aluminum radiators (4 sections ร 3 pcs.) | 12 000 | 15โ20 |
| Metal-plastic pipes (50 m) | 8 000 | 25+ |
Water heating only pays for itself if the garage is used around the clock. For occasional heating (2-3 times a week), it is cheaper to use electric or gas heaters.
6. Heating with waste oil: economical, but dirty
If you have access to used oil (for example, you are doing auto repair), it can be used as fuel. Furnace type "Gecko" or "Typhoon" burn oil with an efficiency of up to 80%, and the calorific value of the exhaust is comparable to diesel (10,000โ11,000 kcal/kg).
Benefits:
- ๐ฐ Free fuel (if your own oil).
- ๐ฅ High heat transfer (1 liter of oil = 1.5 kg of firewood).
Disadvantages:
- ๐ข๏ธ Necessary filter and settle oil before use.
- ๐งน The oven requires cleaning once every 2-3 days (soot, soot).
- ๐ซ Prohibited for use in residential areas (strong odor).
For a garage of 20 mยฒ, a furnace with a power of 5โ7 kW is sufficient (for example, "Teplotechnik TT-5"). Oil consumption - 0.5โ1 l/h. Main rule: Do not burn oil containing antifreeze or gasoline - this will lead to an explosion!
7. Alternative methods: solar panels and heat pumps
For eco-garages or regions with high electricity tariffs, the following are suitable:
- โ๏ธ Solar collectors. In the summer they will completely cover the needs for hot water, and in the winter they will help reduce heating costs. For example, a vacuum manifold Solarhart SH-200 (20,000 โฝ) will pay off in 3โ5 years.
- โป๏ธ Heat pumps. Air-to-air systems (Mitsubishi Electric MSZ-LN) take heat from the street and release it into the room. The efficiency coefficient (COP) reaches 4โ5, that is, for 1 kW of electricity you get 4โ5 kW of heat.
The disadvantage of such systems is high initial cost (from 150,000 โฝ for a heat pump) and dependence on climate. In regions with temperatures below -25ยฐC, the efficiency of heat pumps drops by 2โ3 times.
โ ๏ธ Attention: If you plan to insulate your garage before installing an alternative system, use non-flammable materials (for example, basalt wool Rockwool or slabs Penoplex). Styrofoam in the garage is dangerous - in the event of a fire, it releases toxic styrene.
Comparison table: which heater to choose?
| Heating type | Heating rate | Autonomy | Security | Heating cost (month, 20 mยฒ) |
|---|---|---|---|---|
| Wood stove | High | Full | Low (fire risk, carbon monoxide) | 500โ1,000 โฝ (firewood) |
| Gas gun | Instant | Limited by balloon | Medium (needs ventilation) | 1,500โ2,500 โฝ (propane) |
| Electric convector | Average | Network dependent | High | 2 000โ3 500 โฝ |
| Water heating | Slow | Full (with an autonomous boiler) | High | 800โ1,500 โฝ (gas) |
| Working off | High | Full | Low (odor, soot) | 0โ300 โฝ (if your own oil) |
FAQ: Answers to frequently asked questions
Is it possible to heat a garage with an infrared heater if tires and rubber parts are stored there?
Yes, but you need to follow two rules:
- The distance from the heater to rubber products is at least 1 m.
- The heating temperature of the heater surface should not exceed 80ยฐC (check in the model datasheet).
Infrared heaters do not burn oxygen or dry the air, so they are safer than heat guns for storing rubber.
How to calculate the power of a garage heater?
Use the formula:
Power (kW) = (Garage volume (mยณ) ร Temperature difference (ฮT) ร Heat loss coefficient) / 860Example for a garage of 20 mยฒ (height 2.5 m, ฮT = 30ยฐC, coefficient 1.5 for brick walls):
(20 ร 2.5 ร 30 ร 1.5) / 860 โ 2.6 kWFor reliability, take a heater with a margin of 20โ30% (for example, 3โ3.5 kW).
What to do if there is no ventilation in the garage, but you want to install a gas gun?
Minimum security measures:
- Install supply valve (for example, KPV-125) in the wall.
- Use the cannon with closed combustion chamber (for example, Ballu BHG-40N).
- Open the gate for 5-10 minutes every hour for ventilation.
But it is better to abandon gas in favor of an electric or diesel heater.
How to insulate a garage to reduce heating costs?
Effective activities by priority:
- Insulate gate polyurethane foam (thickness 50 mm).
- Close the cracks sealing tape (for example, Deventer).
- Install three-chamber double-glazed windows (if there are windows).
- Cover the floor penoplex 50 mm + screed.
This will reduce heat loss by 30โ40% and reduce the power of the required heater.
Is it possible to use a car preheater (Webasto) for heating a garage?
Technically yes, but this ineffective and dangerous:
- Heaters type Webasto Thermo Top Evo designed for small volumes (car interior).
- They burn gasoline from the car tank (consumption ~0.5 l/h), which is expensive.
- When working in a closed garage, carbon monoxide accumulates.
It is better to buy a separate heater for the garage.