Gas Unit Heaters

Gas unit heaters provide gas-fired space heating for commercial, industrial, and work areas such as factories, warehouses, garages, barns, and indoor shops. Available options include high-capacity unit heaters, power-vented models, separated-combustion units for dusty environments, and conversion kits for compatible heaters.

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Helpful Buying Guide

How to Choose a Gas Unit Heater

Start with the heating capacity and the type of space you need to warm, then compare fuel setup, venting approach, heat distribution, and installation configuration. The products represented here range from 30,000 to 400,000 BTU heating equipment, with options for natural gas, propane conversion, power venting, and separated combustion.

Visual Guide

Popular examples in this category

150,000 BTU Propane Gas Unit Heater150,000 BTU Propane Gas Unit HeaterWBB2060346Natural Gas to LP Conversion Kit for 100,000–150,000 BTU Unit HeatersNatural Gas to LP Conversion Kit for 100,000–150,000 BTU Unit HeatersWBB3139603Natural Gas to Liquid Propane Conversion Kit for 250,000 BTU Unit HeatersNatural Gas to Liquid Propane Conversion Kit for 250,000 BTU Unit HeatersWBB3139605High-Efficiency Gas-Fired Unit Heater, 300,000 BTU InputHigh-Efficiency Gas-Fired Unit Heater, 300,000 BTU InputWB246465
Use Cases

Match the heater to the workspace

Gas unit heaters are represented for factories, warehouses, commercial and industrial facilities, garages, barns used as workspaces, and indoor areas that need overhead heat. Separated-combustion models are also suited to woodworking shops and other dusty environments.

How to Choose

Compare capacity, fuel, and airflow

Compare BTU input or output with the heating requirement. Where stated, models cover up to 3,125, 5,000, or 6,700 square feet, while heat throw ratings range from 51 to 74 feet. Also confirm natural gas or propane needs and whether a compatible conversion kit is required.

Applications

Consider the installation layout

Power-vented models move exhaust outdoors through a single vent pipe. Other models support vertical or horizontal venting, and separated-combustion units use separate pipes for combustion-air intake and flue-gas exhaust. Low-profile units and ceiling-mount brackets support overhead applications where clearance matters.

Additional Info

Review directional and operating features

Adjustable or multi-position louvers help direct heated air. Selected models include intermittent pilot ignition, safety pressure switches, fan delay timers, permanently lubricated motors, reversible connections, 120-volt operation, steel construction, and aluminized steel heat exchangers.

30,000–400,000BTU ratings represented

The category includes lower-capacity through high-input gas unit heater options.

Up to 6,700 sq. ft.Stated coverage

A 200,000 BTU power-vented model is stated for large work areas up to this size.

51–74 ft.Listed heat throw range

Selected gas-fired models list heat distribution reaches within this range.

2 vent pipesSeparated-combustion venting

These models use separate combustion-air intake and flue-gas exhaust pipes.

Comparison Guide

Compare Gas Unit Heater Types

Use the product type, stated ratings, and installation features to narrow the available options.

Product typeRepresentative detailsWhat to compare
Power-vented gas unit heater150,000 or 200,000 BTU output; stated coverage up to 5,000 or 6,700 square feetSingle-pipe exhaust arrangement, coverage, louver positions, and aluminized steel heat exchanger
Gas-fired unit heater150,000, 200,000, 300,000, or 400,000 BTU input options; selected models list 120-volt operation and 51- to 74-foot heat throwInput and output ratings, heat throw, steel construction, venting direction, and installation orientation
Separated-combustion unit heater30,000 or 45,000 BTU natural gas options with outside combustion airTwo-pipe venting, low-profile mounting, control orientation, and suitability for dusty work areas
Planning Guide

Plan the right fit before choosing

1. Size the heating requirement

Use stated capacity and coverage details as your starting point

The available heater types include units with 30,000, 45,000, 125,000, 150,000, 200,000, 300,000, and 400,000 BTU ratings. Some listings provide both input and output values, which can help with comparison.

  • A 125,000 BTU model is stated for areas up to 3,125 square feet.
  • A 150,000 BTU power-vented model is stated for spaces up to 5,000 square feet.
  • A 200,000 BTU power-vented model is stated for spaces up to 6,700 square feet.
  • Listed heat throws include 51 feet, 55 feet, and 74 feet.
2. Select combustion, fuel, and venting

Choose a configuration that fits the intended equipment setup

Natural gas unit heaters are represented across the category, and conversion options support compatible heaters changing from natural gas to liquid propane. For spaces where combustion air should come from outside the heated area, separated-combustion models use fresh outside air rather than indoor space air.

  • Conversion kits are represented for compatible 100,000–150,000 BTU and 250,000 BTU indirect-fired unit or utility heaters.
  • One 125,000 BTU natural gas heater includes a liquid propane conversion kit.
  • Power-vented models exhaust through a single vent pipe.
  • Separated-combustion models use two-pipe venting for intake air and flue-gas exhaust.
3. Plan air direction and mounting

Compare airflow control and overhead installation features

Air distribution and mounting details can affect how a heater fits the work area. Adjustable louvers, three-position louvers, and high-velocity fans are represented for directing or circulating heated air. Several units support close-to-ceiling or overhead installation.

  • Low-profile models support close-to-ceiling installation.
  • Selected units include angle brackets or ceiling-mount brackets.
  • Some units allow connection or control orientation changes by flipping the unit and rotating discharge louvers.
  • A 400,000 BTU model has a level hanging mechanism for field adjustment.
FAQ

Common questions before buying

What gas unit heater capacities are represented?

The represented products range from 30,000 BTU to 400,000 BTU, with some models listing both BTU input and output.

Are propane options available?

The category includes a propane gas unit heater, a natural gas heater with an included LP conversion kit, and conversion kits for compatible heaters.

What is a separated-combustion unit heater?

It draws combustion air from outside the heated space rather than using indoor air. Represented models use separate pipes for combustion-air intake and flue-gas exhaust.

How can heated air be directed?

Selected models use adjustable louvers, three-position louvers, or reversible discharge louvers to help direct heated air.

Helpful Buying Guide

How to Choose a Gas Unit Heater

Start with the heating capacity and the type of space you need to warm, then compare fuel setup, venting approach, heat distribution, and installation configuration. The products represented here range from 30,000 to 400,000 BTU heating equipment, with options for natural gas, propane conversion, power venting, and separated combustion.

Visual Guide

Popular examples in this category

150,000 BTU Propane Gas Unit Heater150,000 BTU Propane Gas Unit HeaterWBB2060346Natural Gas to LP Conversion Kit for 100,000–150,000 BTU Unit HeatersNatural Gas to LP Conversion Kit for 100,000–150,000 BTU Unit HeatersWBB3139603Natural Gas to Liquid Propane Conversion Kit for 250,000 BTU Unit HeatersNatural Gas to Liquid Propane Conversion Kit for 250,000 BTU Unit HeatersWBB3139605High-Efficiency Gas-Fired Unit Heater, 300,000 BTU InputHigh-Efficiency Gas-Fired Unit Heater, 300,000 BTU InputWB246465
Use Cases

Match the heater to the workspace

Gas unit heaters are represented for factories, warehouses, commercial and industrial facilities, garages, barns used as workspaces, and indoor areas that need overhead heat. Separated-combustion models are also suited to woodworking shops and other dusty environments.

How to Choose

Compare capacity, fuel, and airflow

Compare BTU input or output with the heating requirement. Where stated, models cover up to 3,125, 5,000, or 6,700 square feet, while heat throw ratings range from 51 to 74 feet. Also confirm natural gas or propane needs and whether a compatible conversion kit is required.

Applications

Consider the installation layout

Power-vented models move exhaust outdoors through a single vent pipe. Other models support vertical or horizontal venting, and separated-combustion units use separate pipes for combustion-air intake and flue-gas exhaust. Low-profile units and ceiling-mount brackets support overhead applications where clearance matters.

Additional Info

Review directional and operating features

Adjustable or multi-position louvers help direct heated air. Selected models include intermittent pilot ignition, safety pressure switches, fan delay timers, permanently lubricated motors, reversible connections, 120-volt operation, steel construction, and aluminized steel heat exchangers.

30,000–400,000BTU ratings represented

The category includes lower-capacity through high-input gas unit heater options.

Up to 6,700 sq. ft.Stated coverage

A 200,000 BTU power-vented model is stated for large work areas up to this size.

51–74 ft.Listed heat throw range

Selected gas-fired models list heat distribution reaches within this range.

2 vent pipesSeparated-combustion venting

These models use separate combustion-air intake and flue-gas exhaust pipes.

Comparison Guide

Compare Gas Unit Heater Types

Use the product type, stated ratings, and installation features to narrow the available options.

Product typeRepresentative detailsWhat to compare
Power-vented gas unit heater150,000 or 200,000 BTU output; stated coverage up to 5,000 or 6,700 square feetSingle-pipe exhaust arrangement, coverage, louver positions, and aluminized steel heat exchanger
Gas-fired unit heater150,000, 200,000, 300,000, or 400,000 BTU input options; selected models list 120-volt operation and 51- to 74-foot heat throwInput and output ratings, heat throw, steel construction, venting direction, and installation orientation
Separated-combustion unit heater30,000 or 45,000 BTU natural gas options with outside combustion airTwo-pipe venting, low-profile mounting, control orientation, and suitability for dusty work areas
Planning Guide

Plan the right fit before choosing

1. Size the heating requirement

Use stated capacity and coverage details as your starting point

The available heater types include units with 30,000, 45,000, 125,000, 150,000, 200,000, 300,000, and 400,000 BTU ratings. Some listings provide both input and output values, which can help with comparison.

  • A 125,000 BTU model is stated for areas up to 3,125 square feet.
  • A 150,000 BTU power-vented model is stated for spaces up to 5,000 square feet.
  • A 200,000 BTU power-vented model is stated for spaces up to 6,700 square feet.
  • Listed heat throws include 51 feet, 55 feet, and 74 feet.
2. Select combustion, fuel, and venting

Choose a configuration that fits the intended equipment setup

Natural gas unit heaters are represented across the category, and conversion options support compatible heaters changing from natural gas to liquid propane. For spaces where combustion air should come from outside the heated area, separated-combustion models use fresh outside air rather than indoor space air.

  • Conversion kits are represented for compatible 100,000–150,000 BTU and 250,000 BTU indirect-fired unit or utility heaters.
  • One 125,000 BTU natural gas heater includes a liquid propane conversion kit.
  • Power-vented models exhaust through a single vent pipe.
  • Separated-combustion models use two-pipe venting for intake air and flue-gas exhaust.
3. Plan air direction and mounting

Compare airflow control and overhead installation features

Air distribution and mounting details can affect how a heater fits the work area. Adjustable louvers, three-position louvers, and high-velocity fans are represented for directing or circulating heated air. Several units support close-to-ceiling or overhead installation.

  • Low-profile models support close-to-ceiling installation.
  • Selected units include angle brackets or ceiling-mount brackets.
  • Some units allow connection or control orientation changes by flipping the unit and rotating discharge louvers.
  • A 400,000 BTU model has a level hanging mechanism for field adjustment.
FAQ

Common questions before buying

What gas unit heater capacities are represented?

The represented products range from 30,000 BTU to 400,000 BTU, with some models listing both BTU input and output.

Are propane options available?

The category includes a propane gas unit heater, a natural gas heater with an included LP conversion kit, and conversion kits for compatible heaters.

What is a separated-combustion unit heater?

It draws combustion air from outside the heated space rather than using indoor air. Represented models use separate pipes for combustion-air intake and flue-gas exhaust.

How can heated air be directed?

Selected models use adjustable louvers, three-position louvers, or reversible discharge louvers to help direct heated air.

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