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 BTU Output: 300,001 - 400,000 

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Indirect Fired Utility Propane/Natural Gas Space Heater ss_pt1917813
Product Features
  • 409 Stainless Steel heater exchanger
  • International ETL or CSA approval
  • High efficiency burner & heat exchanger
  • Quiet operation
More Options »

Indirect Fired Utility Propane/Natural Gas Space Heater

by Frost Fighter

from $7,185.57 $10,299.00
Free Shipping
375,000 BTU Forced Air Utility Propane Space Heater with Thermostat ss_pt1917813
Product Features
  • Propane forced air heater
  • Heater base is fully enclosed for added protection as well as offers height adjustability
  • Adjustable height angle

375,000 BTU Forced Air Utility Propane Space Heater with Thermostat

by Master

$628.99 $2,019.99
Free Shipping
  (1)
Direct Fired Utility Propane/Natural Gas Space Heater ss_pt1917813
Product Features
  • 409 Stainless Steel heater exchanger
  • Easy switchover from propane to natural gas
  • International ETL approval
  • High efficiency burner & heat exchanger
More Options: Power »

Direct Fired Utility Propane/Natural Gas Space Heater

by Frost Fighter

from $2,639.99 $2,780.00
Free Shipping
375,000 BTU Forced Air Utility Propane Space Heater ss_pt1917813
Product Features
  • Easy-lift handle for portability at home or on the jobsite
  • One touch electronic ignition and hat control for easy operation

375,000 BTU Forced Air Utility Propane Space Heater

by Mi-T-M

$559.99 $830.00
Free Shipping
  (2)
Arrives by Dec. 24
400,000 BTU Indirect Fired Utility Propane Space Heater ss_pt1917813
Product Features
  • Indirect fired - heat exchanger allows for external exhaust of combustion products
  • Thermostatically controlled
More Options »

400,000 BTU Indirect Fired Utility Propane Space Heater

by Flagro

from $5,399.99 $7,428.40
Free Shipping
400,000 BTU Forced Air Utility Kerosene Space Heater with Thermostat ss_pt1917813
Product Features
  • Kerosene forced air heater
  • Include wheel and handle kits featuring heavy duty pneumatic tires

400,000 BTU Forced Air Utility Kerosene Space Heater with Thermostat

by Master

$1,499.95 $2,572.50
Free Shipping
ss_pt1917813
Product Features
  • Automatic safety and control devises
  • Large fuel tanks provide hours of continuous operation
  • Limited one year warranty

Indirect Fired 400,000 BTU Diesel Space Heater

by Heatstar

$6,198.99 $9,000.00
Free Shipping
ss_pt1917813
Product Features
  • 409 Stainless Steel heater exchanger
  • Easy switchover from propane to natural gas
  • International ETL approval
  • High efficiency burner & heat exchanger
More Options »

320,000 BTU Oil-Filled Utility Propane or Natural Gas Space Heater

by Frost Fighter

from $6,164.65 $9,971.00
Free Shipping
ss_pt1917813
Product Features
  • Heater
  • Robust, powerful and efficient unit
  • Motor is equipped with a centrifugal fan

Temporary Space Heaters Forced Air Utility Indirect Fired Diesel Sp...

by Munters

$5,399.99 $9,426.00
Free Shipping
ss_pt1917813
Product Features
  • Heater
  • Robust and tough design portable
  • Functions on diesel or kerosene and is very easy to operate

Temporary 396,500 BTU Forced Air Utility Mobile Direct Fired Multi-...

by Munters

$1,499.99 $2,756.26
Free Shipping
ss_pt1917813
Product Features
  • Versatile indoor or outdoor placement
  • Easy rolling wheels
  • Thermostat - Weatherproof with 3' cord
  • Air flow safety devices

Premier-350N Unit 350,000 BTU Utility Natural Gas Space Heater

by L.B. White

$4,084.79 $4,281.31
Free Shipping
ss_pt1917813
Product Features
  • 18 ga. steel cabinet
  • Control compartment housing a master terminal board and a hinged and latched access door
  • Simplified wiring, installation, and maintenance

Horizontal / Vertical 256,000 BTU Fan Forced Wall Space Heater with...

by TPI

$5,503.41 $10,886.00
Free Shipping
ss_pt1917813
Product Features
  • Versatile indoor or outdoor placement
  • Easy rolling wheels
  • Thermostat - Weatherproof with 3' cord
  • Air flow safety devices

Premier-350DF 350,000 BTU Utility Natural Gas Space Heater

by L.B. White

$4,229.99 $4,489.14
Free Shipping
ss_pt1917813
Product Features
  • 18 ga. steel cabinet
  • Control compartment housing a master terminal board and a hinged and latched access door
  • Simplified wiring, installation, and maintenance

Horizontal / Vertical 341,000 BTU Fan Forced Wall Space Heater with...

by TPI

$5,503.41 $10,886.00
Free Shipping
ss_pt1917813
Product Features
  • 18 ga. steel cabinet
  • Control compartment housing a master terminal board and a hinged and latched access door
  • Simplified wiring, installation, and maintenance

Horizontal / Vertical 230,400 BTU Fan Forced Wall Space Heater with...

by TPI

$5,229.99 $10,312.00
Free Shipping
ss_pt1917813
Product Features
  • 18 ga. steel cabinet
  • Control compartment housing a master terminal board and a hinged and latched access door
  • Simplified wiring, installation, and maintenance

Horizontal / Vertical 307,100 BTU Fan Forced Wall Space Heater with...

by TPI

$5,229.99 $10,312.00
Free Shipping
ss_pt1917813
Product Features
  • 20' hose and regulator included
  • High temperature limit switch
  • Automatic solid state ignition
  • Thermostat

250,000-400,000 BTU Forced Air Propane Space Heater

by Heatstar

$688.99 $851.00
Out of Stock
ss_pt1917813
Product Features
  • Direct fired kerosene heater
  • Enclosed motor
  • Fuel gauge

350,000 BTU Direct Fired Kerosene Space Heater

by Heatstar

$1,799.95 $2,750.00
Out of Stock
  (1)
ss_pt1917813
Product Features
  • Heavy Duty
  • Overheat Protection
  • Kerosene Fuel
  • Heats up to 8,500 sq ft

400,000 BTU Forced Air Utility Kerosene Space Heater

by DuraHeat

$1,549.95 $1,899.99
Out of Stock
ss_pt1917813
Product Features
  • Forced Air Propane Heater
  • 250,000 - 400,000 BTU

250,000 - 400,000 BTU Forced Air Utility Propane Space Heater

by Mr. Heater

$720.99 $956.10
Out of Stock
ss_pt1917813
Product Features
  • 2000 cfm of hot air at the touch of a single switch.
  • Light and compact making it easy to handle.

F-400T Direct 400,000 BTU Utility Natural Gas Space Heater

by Flagro

$1,699.95 $1,843.00
Out of Stock
ss_pt1917813
Product Features
  • Extension Cord Wrap
  • Powder coated hood, gas tank and handles
  • Dual prong igniter
  • Secured fully insulated ignition connection

400,000 BTU Forced Air Utility Kerosene Portable Space Heater

by Mi-T-M

$1,679.99 $2,220.00
Out of Stock
ss_pt1917813
Product Features
  • Portable heat for the big jobs
  • Stackable for transportation and storage
  • Rugged to withstand the rough and tough applications

F-375 Convection Compact Propane Space Heater

by Flagro

$429.95 $565.08
Out of Stock
  (1)
ss_pt1917813
Product Features
  • Comfort control T-stat
  • Room temp display
  • Digital diagnostics
  • Front and rear lift handles

Tradesman 400,000 BTU Utility Kerosene Space Heater

by L.B. White

$1,599.99 $1,922.35
Out of Stock
ss_pt1917813
Product Features
  • Safety includes flameout sensor, automatic fuel and overheat shutoff protection

Portable 400,000-BTU Multi-Fuel Forced Air Heater with Built in Dia...

by Dyna-Glo

$1,249.99 $1,612.21
Out of Stock
ss_pt1917813
Product Features
  • Steel with Tri-shield coating to handle years of rough and heavy operation
  • Air flow safety devices
  • Fully enclosed electronics

Tradesman 400,000 BTU Utility Propane Space Heater

by L.B. White

$579.99 $682.38
Out of Stock
ss_pt1917813
Product Features
  • Versatile indoor or outdoor placement
  • Easy rolling wheels
  • Thermostat - Weatherproof with 3' cord
  • Air flow safety devices

Premier 350,000 BTU Utility Propane Space Heater

by L.B. White

$3,799.99 $5,022.11
Out of Stock



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All Space Heaters - BTU Output: 300,001 - 400,000
If you're looking for Space Heaters for sale online, Wayfair.com has a zillion options sure to satisfy the pickiest shopper. We have a myriad of styles of Space Heaters, and if you want to narrow your options to something more specific than your current filter of "300,001 - 400,000," such as finding Space Heaters by brands like Frost Fighter or Munters, just use the filters on the left. And remember, we offer free shipping on just about every order over $49.00, so buy Space Heaters today and have them shipped free.
Read more
Buying Guides
Space Heater Buying Guide
When you need more heat in a small area, a space heater can be an energy-efficient choice. Before you buy, make sure you know the many different kinds of space heaters available. Not only do they have different kinds of fuel in electric or gas, but they use different heating methods as well.
Convection heaters and kerosene heaters are great for large spaces, while radiant heaters are perfect for a small room. Consider energy efficiency and safety ratings. Make sure you know whether or not you'll need a gas hookup or a propane tank. And check on the many styles available for indoor and outdoor space heaters. 
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