Mr. Heater Natural Gas Garage Heater — 45,000 BTU, Model# MHU45NG
Quiet, vented heater for residential and commercial use easily heats 2- to 3-car garage. Requires only 1in. clearance from ceiling with 2 included angle brackets which means heater is up and out of the way. Power exhaust allows for vertical or horizontal venting. Customers are responsible for checking their local codes and Ordinances for approved installation and usage.
Venting kit required (sold separately, Item#s 173640 or 173642). Optional thermostat also available (sold separately, Item# 173641).
Product Specs
Key Specs
Heating Application | Construction, Garage |
Vent-Free | No |
BTU Output | 45,000 |
Blower Included | Yes |
Fuel Type | Natural gas |
Igniter | Spark |
Thermostat Included | No |
Remote Included | No |
Oxygen Depletion Sensor | No |
Dimensions L x W x H (in.) | 25 1/2 x 19 x 12 |
Additional Specs
- Heats 2- to 3-car garage
- Requires only 1in. clearance from ceiling
- Power exhaust allows for horizontal or vertical venting
- Designed for right or left side piping, electrical and flue connections by simply rotating 180°
- Tubular heat exchanger
- Note: Due to BTU loss through exhaust gases, heater runs at approx. 81% operating efficiency
- Venting kit required (sold separately, Item#s 173640 or 173642)
- Optional thermostat also available (sold separately, Item# 173641)
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Customer Product Reviews
Overall Rating:
4.6
/
5
58 of 60(97%)would recommend this product to a friend.
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Review This Product
Overall Rating:
5
/
5
Easiest Install-Best Price-Most Heat,
February 19, 2008
By projectman50
from Chaska, MN
"I purchased Mr. Heater model MHU45NG 45,000 BTU unit for my 26x28 2-car garage with 10 ft. ceilings. This heater is awesome, the blower distributes a mega heat source. I am able to heat my garage on sub-zero days from 20F inside to 68F within 20 minutes. I wired in a Honeywell digital thermostat and control the garage temperature to 40F all winter. It has been a very cold winter here in Minnesota this year, and my Mr. Heater allows me to do many winter projects, I would otherwise have to wait till Spring to do in my garage.
I would recommend Mr Heater to any homeowner that loves a warm garage."
What is your level of technical expertise? Home Handyman
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Overall Rating:
5
/
5
Mr Heater Garage Heater,
November 16, 2006
By nuthinman
from Taos, NM
"Purchased the Mr. Heater Natural Gas Garage Heater to install in a 30'x28' garage. This heater is awesome, it heats my garage up to a comfortable 65 degrees in minutes, even though it may be 15 degrees outside. It's quiet, efficient, and spreads the heat throughout the garage. I chose it as it is compact and space saving with it's only 1" clearance to the ceiling.
Installation was simple, and after adjusting for an altitude of 7000', it fired right up and has not missed a beat since. I would highly recommend this heater to anyone. It is and A1 unit."
Installation was simple, and after adjusting for an altitude of 7000', it fired right up and has not missed a beat since. I would highly recommend this heater to anyone. It is and A1 unit."
What is your level of technical expertise? Professional
7 of 7 people found this review helpful.
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Overall Rating:
4
/
5
Mr.Heater 45,000 BTU Heater,
November 2, 2009
By Kev98HD
from Laurel, MT
"Installed this heater in my garage. Easy to install, the side vent was great,made install much easier. It runs quiet and heats up quick. I have an oversized double garage and this heater heats it up no problem."
What is your level of technical expertise? Home Handyman
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Overall Rating:
5
/
5
Does everything I want it to,
November 2, 2009
By AlexInTaylor
from Taylor, MI
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(click to see full-size image)
"I installed this over the past couple of weekends. The hard part was digging the gas line ditch and hooking into the gas line in the house. Unless you have expertise in plumbing, I'd advise that you contact a pro for the gas connections.
Locating and hooking up the heater was easy. I bought the vertical exhaust kit but decided on installation day to go horizontally out the back wall. It made the job go much quicker than going through the roof. Make sure you get a tube of high-temp sealant to fill in the gaps - especially around the thimble (the part that mounts to the interior and exterior wall).
The performance of the unit is great so far. The local temp was about 45 when I turned the unit on and within 30 minutes the room was up to 60 degrees. I have my garage fully insulated in the walls, ceiling and garage door so I expect the heater will keep me warm even in the cold Michigan winter.
Locating and hooking up the heater was easy. I bought the vertical exhaust kit but decided on installation day to go horizontally out the back wall. It made the job go much quicker than going through the roof. Make sure you get a tube of high-temp sealant to fill in the gaps - especially around the thimble (the part that mounts to the interior and exterior wall).
The performance of the unit is great so far. The local temp was about 45 when I turned the unit on and within 30 minutes the room was up to 60 degrees. I have my garage fully insulated in the walls, ceiling and garage door so I expect the heater will keep me warm even in the cold Michigan winter.
It's time to give back the two kerosene and propane heaters that I borrowed last year."
What is your level of technical expertise? Home Handyman
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Overall Rating:
5
/
5
Mr Heater Model# MHU45NG,
November 2, 2009
By BCBC
from Michigan
"This heater is easy to install and works great. It is quiet and heats up my three car garage in minutes. It's low profile and clearance requirements allow installation in garages that do not have high ceilings. Definaltely worth the investment."
What is your level of technical expertise? Home Handyman
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Overall Rating:
5
/
5
Great Product,
October 19, 2009
By MissKitty
from WARREN,MI
"This heater is great for heating a garage. We had another brand that broke down that would have costed more to fix so we went on the Northern Tool website & found this one. To our surprise we could buy one for less than repairing the old one. We were so happy with this one that 2 others friends bought them for their garages. It is a good clean unit that runs quietly. It was easy to connect to the fittings already in place.I would recommend this to all who need a economical way to heat a garage."
What is your level of technical expertise? Home Handyman
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Overall Rating:
5
/
5
Garage Heat - At Last,
July 13, 2009
By Allentp49
from Metamora, IL
"This is absolutely the best heater I have ever had in a garage. I have tried electric heaters, kerosene, wood stoves, ventless gas heaters, and this one beats them all.
It was easy to install (assuming you have a gas line handy), and it provides clean heat with virtually no noise. Since the exhaust is powered, it was simple to run the flue through a side wall to avoid punching hole in the roof - no leaks!
By mounting it on the ceiling, I regained the space that had been claimed by the smelly ventless space heater mounted on the wall.
I can warm my 30x30 garage from 30 degrees to tee shirt temperature in about 15 minutes. And since it is vented to the outside, my garage is constantly supplied with fresh air. No more choking fumes, and recirculating welding smoke.
I wish I had done this a long time ago. Overall - a robust product at a fair price."
What is your level of technical expertise? Home Handyman
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Overall Rating:
5
/
5
Great heater,
March 23, 2009
By roadawg
from Pennsylvania
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"This unit installed quickly and worked perfect right out of the box.We are heating a 20x35 room with the two 35' walls all single pane glass, it does a great job! Thanks Rich"
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Overall Rating:
5
/
5
Nice Heater,
March 22, 2009
By POPSLXCOUPE
from Ky
"I hade two electric heater and they didn'tdo as good a job as this gas heater. I don'thave to wait for two or three hour5s for my shop to get warm so I can go to work. I install the heater myself and the instrution on how to install the heater was very helpful.Got a very good tech department I had a problem ,Told them the problem and they help me and sent me the part and told me how to solve my problem. Great Product !!!"
What is your level of technical expertise? Home Handyman
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Overall Rating:
5
/
5
Mr. Heater Garage Heater,
March 17, 2009
By kts67
from Illinois
"This heater is great. It was a gift for my husband and he loves it. Heats up the garage quickly."
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Items You'll Need
Venting
See All
| Add | ||||
|---|---|---|---|---|
| Vertical-Mount Vent Kit For Mr. Heater 45,000 BTU Garage Heaters — 3in. Flue Pipe | 173640 | In Stock | Only $119.99 | |
| Horizontal-Mount Vent Kit For Mr. Heater 45,000 BTU and 75,000 BTU Garage Heaters — 4in. Flue Pipe | 173642 | In Stock | Only $119.99 | |
Items We Recommend
Hose Assemblies + Regulators
See All
| Add | ||||
|---|---|---|---|---|
| Mr. Heater Universal Gas Connection Kit, Model# F271239 | 172712 | In Stock | Only $24.99 | |
Thermostats
See All
| Add | ||||
|---|---|---|---|---|
| 24 Volt Thermostat For Mr. Heater Garage Heaters | 173641 | In Stock | Only $34.99 | |
Manufacturer Warranty: 12 months parts / 12 months labor
Protect Your Purchase Beyond The Manufacturer's Warranty With Service Protection Plus!
| Extended Service Plan Description (learn more) | 1 Year | 2 Year |
|---|---|---|
| Replacement Plan | $49.99 More Info | $69.99 More Info |
| Accidental Damage Replacement Plan | $79.99 More Info | $99.99 More Info |
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