Fixed Gas Heater

Choosing a fixed gas heater for your workshop, warehouse or industrial hall represents a strategic investment that will commit your operations for many years. At Climatik, we assist French professionals in selecting fixed warm air generators that exactly match the volumes to be heated, the type of gas connection available, and regulatory constraints.

Our experts guide you to leading European brands such as Sovelor-Dantherm, Reznor, Exeltec, SPLUS, consistently favoring indirect combustion solutions that ensure perfectly clean warm air with zero emissions into your premises.

Indirect combustion: the fundamental difference

All professional fixed gas heaters operate exclusively with indirect combustion, with flue gas evacuation via a chimney or flue. This technical characteristic radically changes the game compared to mobile gas heaters.

The principle of indirect combustion

In an indirect combustion warm air generator, the gas burner heats a sealed stainless steel heat exchanger (AISI 441) that transfers heat to the forced air. The combustion gases circulate in a completely separate circuit and are evacuated to the outside via a chimney or wall-mounted flue.

The warm air blown into your premises is absolutely pure, without any trace of CO₂, combustion moisture, or gas odor. This total separation allows for exceptional efficiencies of over 92%, and up to 109% for condensing models that recover the latent heat contained in the water vapor from the flue gases.

Specifically, you can install a fixed gas heater in any enclosed space, including public access buildings (ERP) up to 35 kW per unit, without the need for permanent ventilation. Your employees work in healthy air, your products are not exposed to combustion moisture, and your consumption is optimized.

Natural gas or propane: which connection?

The choice between natural gas and propane depends on your connection to the distribution network.

Fixed natural gas heating

If your building is connected to the city gas network (natural gas G20 at 20 mbar or Groningen gas G25), fixed natural gas heating is the simplest and most economical solution. You benefit from an unlimited supply without storage, a particularly attractive kWh cost for business contracts, and a lightweight installation with a simple connection to your existing network.

Natural gas air heaters are available from 20 kW to 235 kW, with atmospheric two-stage or modulating burners that adapt precisely to your real-time thermal needs.

Fixed propane gas heating

For sites not connected to the network, fixed propane heating offers an efficient alternative, requiring only the installation of an outdoor storage tank. Professional models accept supply from an underground or above-ground tank, with a pressure regulator adapted to the 37 mbar propane pressure.

This solution is perfectly suited for rural areas, agricultural hangars, isolated warehouses, or temporary buildings where connection to city gas represents a disproportionate investment. The energy cost of propane remains very competitive, generally 40 to 50% lower than electricity for the same amount of heat produced.

Floor or suspended installation

Fixed gas heaters come in two configurations that address different space constraints and thermal distribution needs.

Floor-standing generators with chimney

Floor-standing generators from 35 kW to 235 kW are suitable for workshops, garages, and small to medium-sized technical rooms. These models are positioned against an exterior wall to facilitate flue gas evacuation via a vertical chimney with a diameter of 153 or 200 mm depending on the power.

Their main advantage lies in the possibility of connecting them to a network of textile or rigid ducts that distributes warm air homogeneously across multiple zones. You can thus install the generator outside under cover and distribute heat to several adjacent rooms without occupying indoor space.

Ceiling-suspended air heaters

Suspended gas air heaters from 20 kW to 80 kW are the preferred solution for large industrial volumes, warehouses, and storage halls where floor space is valuable. Suspended from the ceiling by threaded rods, these units completely free up floor space for your activities.

Their horizontal or vertical airflow ensures homogeneous heat distribution, and destratification models recover calories accumulated at height to redirect them to the floor, generating energy savings of 30 to 50% in buildings with high ceilings.

Flue gas evacuation is done via a concentric wall flue or a roof chimney depending on the configuration, with prefabricated kits that significantly simplify installation.

Sizing and applications

The sizing of a fixed gas heater follows a precise methodology that takes into account volume, insulation, ceiling height, and air change rate.

Power calculation

For a properly insulated professional premises with a ceiling height of 3 to 4 meters, count 35 to 45 watts per cubic meter. A 400 m² workshop with a 4 m height = 1,600 m³, requiring a 56 to 72 kW generator. In practice, choose a 60 or 70 kW model with a two-stage burner to have a power reserve.

For poorly insulated or semi-open buildings (agricultural hangars, warehouses with loading docks), increase the power by at least 50%. For premises with very high ceilings >8 meters, prioritize destratification air heaters rather than oversizing the power.

Applications by sector

Mechanical workshops and garages: floor-standing generators from 35 to 110 kW depending on surface area, with optional duct network to heat reception areas and workstations simultaneously.

Logistics warehouses and platforms: suspended air heaters from 60 to 80 kW positioned every 15 to 20 meters for homogeneous thermal coverage.

Agricultural hangars and greenhouses: mixed installations with floor-standing generators connected to perforated ducts to distribute warm air as close as possible to crops or animals.

Regulations and mandatory maintenance

The installation of a fixed gas heater is subject to strict regulations requiring the use of a qualified professional.

The initial commissioning must be carried out by an approved installer who verifies the gas connection, flue gas evacuation, combustion circuit tightness, and the proper functioning of safety devices (ionization flame control, overheating safety, control airstats). A certificate of conformity is provided upon completion of this commissioning.

The mandatory annual maintenance includes cleaning the heat exchanger, checking and adjusting the burner, checking safety components, measuring CO and NOx emissions, and inspecting the flue gas evacuation. This maintenance contract guarantees optimal efficiency and prevents costly breakdowns during the heating season.

Climatik support

At Climatik, we do not perform installation as it requires specific qualifications and gas certification. Our added value lies upstream: we help you precisely size your installation, choose between natural gas and propane according to your connection, determine the optimal number and placement of units, and select models from the best European manufacturers.

We then connect you with qualified installers in your region who will carry out the installation and commissioning according to best practices. All our fixed gas heaters are available in stock with fast delivery throughout France.

Questions about Fixed Gas Heater?

Our experts answer your questions.

What is the difference between a fixed gas heater and a portable gas heater?

The fundamental distinction lies in the combustion technology and regulatory compliance.

The mobile gas heater uses direct combustion: combustion gases (CO₂, water vapor) are diffused with the heat into your premises. This requires permanent ventilation and limits use to semi-open or temporary spaces. Lifespan: 5 to 8 years. Price: €600 to €1,200.

Fixed gas heating exclusively uses indirect combustion with a sealed stainless steel heat exchanger. Fumes are evacuated via a chimney or flue, and the blown air remains perfectly pure. Exceptional efficiency: 92% minimum, up to 109% in condensation mode. Lifespan: 15 to 20 years. Permanent ERP-compliant installation up to 35 kW per unit.

This total separation of circuits allows installation in any enclosed space without ventilation constraints, with substantial energy savings thanks to superior efficiency.

Natural gas or propane for my workshop, how do I choose?

Cette question ne relève pas vraiment d'un choix personnel mais d'une contrainte technique de raccordement.

Gaz naturel (gaz de ville) : Si votre rue est desservie par le réseau GRDF, le gaz naturel s'impose naturellement. Alimentation illimitée sans stockage, coût du kWh le plus attractif (8 à 10 cts), installation simple par raccordement sur votre réseau existant. Disponible en toutes puissances de 20 à 235 kW. C'est la solution la plus économique si le réseau existe.

Propane (citerne) : Pour les sites non raccordés au réseau, le propane nécessite l'installation d'une citerne extérieure (enterrée ou aérienne). Coût énergétique restant très compétitif, 40 à 50 % moins cher que l'électricité à chaleur égale. Idéal pour zones rurales, hangars agricoles, entrepôts isolés où le raccordement gaz de ville serait trop coûteux.

Vérification simple : contactez GRDF pour savoir si le réseau passe dans votre rue. Si oui, gaz naturel. Si non, propane avec citerne.

What fixed gas heating power for my professional volume?

No, our products are not tested on animals.

Does the installation of a fixed gas heater have to be carried out by a professional?

Vous avez la possibilité d'échanger votre commande dans les 14 jours suivant sa réception. Pour cela, le produit ne doit pas avoir été porté et être renvoyé dans son emballage d'origine avec l'étiquette.