Understanding the differences between the gases: natural, propane, and butane
Origin, storage, and distribution: mains, tank, or cylinder
Natural gas is mostly methane. It arrives via a public network, with a meter. Propane and butane are LPG (liquefied petroleum gas), produced by refining and gas processing. They're stored at the client's property, in a tank (above-ground or buried) or in cylinders, then delivered by truck.
Calorific value and efficiency: what it changes on the ground
For an equal volume, propane and butane deliver more energy than natural gas. In practice, you mainly think in terms of billed kWh. The key point is matching the equipment. A burner set for the right gas gives stable combustion, and therefore good efficiency. A poorly matched nozzle means an irregular flame and recurring breakdowns.
Installation and maintenance constraints: what you need to plan for
Natural gas simplifies storage, but requires a connection and compliant ventilation. With LPG, you need to plan the tank's location, delivery accessibility, and a suitable regulator. Since these gases are heavier than air, basement locations are avoided. On the maintenance side, the rule stays simple. A gas appliance needs annual servicing, and regular inspection of the fittings limits leaks.
Gas and heating uses: which solution for which job
A connected home: when natural gas still makes sense
When the home is already connected, natural gas can remain a practical option for renovation, especially with water-based radiators and a quick boiler replacement. A well-adjusted condensing boiler, with regulation and balancing, limits consumption. For the job to hold up, insulation and airtightness remain the real lever.
An off-grid site: the appeal of propane in a tank for heating
Off the mains network, propane in a tank offers the same usage logic as a gas boiler, with good autonomy. You need to plan the location, delivery access, and a contract (rental or consignment). In practice, it's a transitional solution when the available electrical supply doesn't yet support a heat pump.
Small needs: the limits of butane for heating a home
Butane in a cylinder is handy for occasional needs, but quickly hits its limits for heating an entire home. Flow rates, handling, frequent replacements, and mandatory ventilation complicate continuous use. It's better reserved for backup heating or cooking, with the main heating pointed toward a durable solution.
Comparing gas costs in 2026: prices and client budget explained simply
Energy cost and price variations: points of vigilance in 2026
In 2026, the price of gas varies depending on your contract. Many offers track the reference price published each month. Watch out for increases tied to taxes, the transport tariff, and the subscription fee. Explain to the client the difference between a fixed price and an indexed price, and that a "good price" is judged over a full year.
Investment: boiler, tank, connection, and accessories
The budget isn't limited to the boiler. Also count installation, the flue, regulation, and sometimes the network connection. For propane, add the tank, its installation, rental, and inspections. These are fixed costs to factor into the quote from the start.
Actual consumption: factors that make the bill spike or drop
The bill mainly depends on consumption. The differences often come down to very concrete details.
- Insulation and airtightness of the home.
- Setpoint temperature and time-based programming.
- Regulation, balancing, annual maintenance.
- Heated surface area, hot water, local weather.
A higher setpoint or a poorly insulated home, and the gas goes out through the roof like the heat from a bulb with no shade.
Safety, regulations, and best practices for tradespeople: avoiding mistakes
Ventilation, flue evacuation, and detection: requirements to follow
With a gas appliance, the golden rule is air. Check the air inlets, room air circulation, and flue compliance. After installation, run an airtightness check and verify the draft. CO detection isn't a gadget. Recommend a detector, especially in renovation.
Propane/butane storage: distances, access, and protection
Store cylinders in a ventilated area, on stable ground, cylinder upright with the valve protected. Avoid heat sources, impacts, and traffic zones. Propane must not be stored in a basement. Keep simple access for servicing and emergency shutoff.
Maintenance and inspections: obligations and traceability in your files
For a boiler, annual maintenance is mandatory in most cases. Keep the maintenance certificate, the settings, the combustion measurements, and photos of the ventilation and flue evacuation. In your files, clear traceability avoids disputes and secures commissioning. For the flue/duct side, also think about flue lining when it's required.
Grants and alternatives: how to position gas against 2026 solutions
CEE, MaPrimeRénov', and gas: what's possible (and what isn't) in 2026
In 2026, grants mainly push low-carbon solutions. Installing a new gas boiler is, in most cases, outside the MaPrimeRénov' pathways. On the CEE side, you'll more easily find bonuses for regulation, optimization, and envelope work than for the gas equipment itself. Keep this idea in mind. Gas mainly holds its ground through high-impact measures.
Gas + renovation: prioritizing insulation and adjustment to secure performance
If the home stays on gas, start by reducing the needs. Loft and wall insulation, airtightness, then boiler adjustment, network balancing, thermostatic valves, outdoor sensor. You stabilize comfort and limit excess consumption, without selling a miracle. A well-done tune-up is often worth more than a rushed replacement.
When to switch to a heat pump or a hybrid system: decision criteria
You switch when heat loss has been addressed, or when the gas boiler reaches end of life. Decide based on an energy audit, the space for the outdoor unit, the available electrical power, and the emitters. In cold climates or with high-temperature radiators, a hybrid can keep gas as backup. The goal: a correctly sized solution.
Key figures
€0.12/kWh
Natural gas
limited use (low power)
Butane
€0.18 to €0.22/kWh
Propane
Frequently asked questions
You must meet safety and ventilation requirements (air inlets, flue evacuation, a suitable location) and rely on the DTU technical guides for flue systems (notably the DTU 24.1 series) and the manufacturer's manual. In practice, always plan for a fitting airtightness check and commissioning with combustion adjustment (CO/CO₂) to avoid excess consumption and recurring breakdowns.
Louis Airy
COO of Argile
