Skip to content
BIG FRIGGIN DEALS: One Big Deal. One Day Only. Shop Todays Offer >
Northern Tool Equipment Logo TextNorthern Tool Equipment Logo text link to Home.

Free Gift Card on All Orders Over $100 See Details

Free Gift Card Details

$100 Order
$10
gift card
$250 Order
$25
gift card
$500 Order
$50
gift card
$1000 Order
$100
gift card
  • The promotion will be automatically applied on the Shopping Cart page.
  • To qualify for this offer, your order subtotal must equal $100 or more. Excludes gift cards, free item offers, warranties, Advantage memberships, tax and shipping.
  • Free gift cards will be issued in the form of e-gift cards only, not physical gift cards.
  • E-gift cards will be sent to the email address used in your billing address when your order ships or is picked up.
  • Free e-gift cards expire 03/01/27.
  • Promo code not valid on prior purchases or on Honda and STIHL products and cannot be combined with other promotional offers.
  • Valid online and in participating retail stores.
  • Limited-time offer. Subject to change without notice.
Print

Mr. Heater Natural Gas Heater, 40,000 BTU, Model# MH40NG

Item# 17353
Mr. Heater Natural Gas Heater, 40,000 BTU, Model# MH40NG

This is a carousel with one large zoomable image and a track of thumbnails on the left. Select any of the thumbnail buttons to change the zoomable image on the right. If a thumbnail is a video or 360 degree image thumbnail, or the last thumbnail in the list, the button will open the product media modal.

Mr. Heater Natural Gas Heater, 40,000 BTU, Model# MH40NG

Click or Tap image to Zoom

$569.99

  • Shipping: 

    Available now

  • Store Pickup: 

    Not Available
  • Heats up to 1,000 sq. feet
  • Efficient Infrared Heat - Directly heats people and objects which in turn heats surrounding air to desired temperature
  • Economical - No electricity required. Heats during power outages
  • Convenient - Easy to operate and install; All necessary brackets and hardware included
  • Quiet, clean, odor-free operation

See full description

Complete Your Solution

  • Mr. Heater Natural Gas Heater, 40,000 BTU, Model# MH40NG
  • Mr. Heater Universal Gas Connection Kit, Model# F271239
Price for all two:

$593.98

Frequently Bought Together

  • Description

  • Key Specs

  • Reviews

  • Q & A

  • Accessories

  • Warranty

  • Compare

Product Summary

Provides plenty of heat even during power outages -- requires no electricity. Thermostat is included for comfort control. For indoor use within the following clearance to combustibles measurements: 34in. from ceiling, 30in. from sides of heater, 30in. from back and 68in. from the base. Recommended for buildings with 12ft. to 15ft. ceilings. AGA design certified. U.S.A.

What's Included

    (1) Mr. Heater Natural Gas Heater -- 40,000 BTU, Model# MH40NG, (1) Mounting Hardware

Features + Benefits

  • Heats up to 1,000 sq. feet
  • Efficient Infrared Heat - Directly heats people and objects which in turn heats surrounding air to desired temperature
  • Economical - No electricity required. Heats during power outages
  • Convenient - Easy to operate and install; All necessary brackets and hardware included
  • Quiet, clean, odor-free operation
  • Instant Heat - Includes adjustable thermostat for individually controlled warmth
  • CSA certified

Key Specs

AttributeSpecification

item#

17353

Brand

Mr. Heater

Manufacturer's Warranty

1 year limited warranty

Ship Weight

24.7 LB

Heat Output

40,000 Btu/hour
AttributeSpecification

Heat Type

Radiant

Blower Included

No

Thermostat Included

Yes

Dimensions L x W x H (in.)

35.5 x 12.5 x 21

Reviews

Questions & Answers

25 Reviews This action will navigate to reviews.

Questions

1–10 of 20 Questions  
Sort by:

  1. Will this work on a covered outdoor patio?

    The covered area is walled in on three sides, so there should be very little wind.

    1. Would work great. But has exposed pilot light you have to protect from wind.

      Helpful?

    2. This unit will work on a covered outdoor patio. It just will not be able to work in an outdoor environment exposed to the elements like rain and snow. You must maintain the clearance to combustibles of 34in. from ceiling, 30in. from sides of heater, 30in. from back and 68in. from the base.

      Helpful?

    3. Thank you for your inquiry. This unit will work on a covered outdoor patio, Yes. It just will not be able to work in an outdoor environment exposed to the elements (rain, snow).

      Helpful?

  2. How does the thermostat work?

    the feature list states no electricity required, but there is a thermostat. How does it run? What controls the regulator? off battery?

    1. Through a thermocouple. No electricity is needed.

      Helpful?

    2. It works in conjunction with a power pile thermocouple that generates it's own electrical supply. There is no regulator. The gas valve gets the electrical energy from the power pile thermocouple and the heat from the pilot flame. There is no battery. Simple easy installation.

      Helpful?

    3. The thermostat is connected to the gas valve on the heater. You would set the thermostat to the off position. Turn the manual gas control knob on the gas valve to the off position and wait 5 minutes to allow any gas that has settled to escape. You would then turn the control knob to pilot. Light the pilot with a match. Hold the knob down for 30 seconds to allow any air in the gas line to pass through the pilot. Let the the thermocouple heat up enough to activate the safety valve in the open position. Then you release the manual gas control knob and turn to the on position. Then set the thermostat to desired temperature.

      Helpful?

  3. Will this work using propane instead of natural gas?

    1. Two models available. Propane or Nat Gas. Get the right one & you’ll be fine.

      Helpful?

    2. This heater is for use with natural gas. The item #17352 would be the propane version for this heater.

      Helpful?

  4. What are the demensions of this heater?

    1. This natural gas heater is 30-1/4" L x 19-1/4" W x 12" H.

      Helpful?

    2. Thank you for your inquiry. Length 30 1/4 inches, Width 19 1/4 inches, and Height 12 inches.

      Helpful?

  5. Ceiling Height, Space from ceiling & wall

    I'm installing this on a screened-in porch with a 10' ceiling. I probably need to mount it at about 8' to allow air space around the unit. Is that safe for people walking under it?

    1. This heater requires clearances of 34” above the heater and 68” below, to combustibles, so the bottom of the heater will be in the 7 foot range which is very close to heads as people walk near it. It would be recommended to have 8 foot of clearance.

      Helpful?

    2. This unit is recommended to be installed in buildings with 12 to 15 feet high ceilings. Installing it on a 10 foot high ceiling would not be recommended. Further the unit needs the following clearances to combustibles distances : 34in. from ceiling, 30in. from sides of heater, 30in. from back and 68in. from the base.

      Helpful?

  6. is this heater alright for a shop with 12' ceilings and wood floors

    1. my shop has 12' ceiling height I love it !

      Helpful?

    2. This Mr. Heater Natural Gas Heater has a minimum clearance of 8’ above the floor for public garages in accordance with ANSI/NFPA No. 409 most recent edition. Please see the owners manual for detailed clearance information.

      Helpful?

  7. how is this heater vented

    1. There is no venting with a flue for this Heater.

      Helpful?

    2. This Mr. Heater Natural Gas Heater is for building with 12 - 15 foot ceilings. This type of heating requires a minimum intake and exhaust openings that provide not less than 400 CFM for every 100,000 Btu's. Where natural ventilation is provided for exhaust, the opening must be distributed above the heaters, and the areas opening should not be less than 300 square inches for every 100,000 Btu input. Check local code and ordinances before purchasing. Professional installation is recommended.

      Helpful?

  8. The specifications state that this heater is not vent free. How is it vented?

    1. You need to have fresh air intake to the specs of the heater. Most garages or shops leak enough air to cover this. Otherwise you can crack a window or door when it's running. I run it in a large 2 car garage and it burns really clean. But you still need fresh air / oxygen. Hope this helps.

      Helpful?

    2. This Mr. Heater Natural Gas Heater is for building with 12 - 15 foot ceilings. This type of heating requires a minimum intake and exhaust openings that provide not less than 400 CFM for every 100,000 Btu's. Where natural ventilation is provided for exhaust, the opening must be distributed above the heaters, and the areas opening should not be less than 300 square inches for every 100,000 Btu input. Check local code and ordinances before purchasing. Professional installation is recommended.

      Helpful?

  9. How does this heater ignite? Turn on/off?

    1. Pilot light

      Helpful?

    2. The thermostat controls the on/off signal to the pilot.

      Helpful?

  10. my shop has 10 ft. ceilings and approw 32x36 will this heater heat it

    1. My shop has a 12 ft ceiling and is 30 x 20 and is insulated - on a 10 degree day (the lowest i had this winter) i had no problem maintaining 65 degrees. I would also recommend installing a ceiling fan since the hot air rises i noticed it was 10 - 15 degrees hotter on the ceiling - once i installed a ceiling fan there was more uniform temp and the unit cycled on far less than before.

      Helpful?

    2. Start by determining the following about your heater needs:
      How large is the area being heated in cubic feet? Calculate area dimensions (Length x Width x Height) = Total Cubic Feet

      What is the desired temperature increase to be gained by the heater? Calculate (Desired temperature(with Heater) - Area temperature(without heater)) = Desired Temperature Increase

      Calculate the BTU's required to achieve desired temperature. Calculate ((Total Cubic Feet x .133) x Desired Temperature Increase) = BTU's Required

      The above calculations are estimates to measure your heating needs.

      Helpful?

Accessories We Recommend

This is a carousel with auto-rotating slides. Activate any of the buttons to disable rotation. Use Next and Previous buttons to navigate, or jump to a slide with the slide dots.

See All Hose Assemblies + Regulators
Mr. Heater Universal Gas Connection Kit, Model# F271239
4.7 out of 5 stars. 98 reviews

Mr. Heater Universal Gas Connection Kit, Model# F271239

Item # 172712

$23.99

Warranty

Manufacturer's Warranty

1 year limited warranty

Extend Your Warranty Coverage with a Northern Protection Plan (NPP)

Repair Plan — 1 Year

A Northern Protection Plan is available after adding the product to your shopping cart.

Recently Viewed Items

This is a carousel with auto-rotating slides. Activate any of the buttons to disable rotation. Use Next and Previous buttons to navigate, or jump to a slide with the slide dots.

Mr. Heater Natural Gas Heater, 40,000 BTU, Model# MH40NG
4.9 out of 5 stars. 25 reviews

Mr. Heater Natural Gas Heater, 40,000 BTU, Model# MH40NG

Item # 17353

$569.99