Customer Reviews

Mr. Heater MH25NG 25,000-BTU Natural-Gas Radiant Heater

5 star:		(5)
4 star:		(6)
3 star:		(1)
2 star:		(1)
1 star:		(2)

 

 

This is a really nice unit if it fits your purpose. I must stress however, that is if it fits your purpose. As I now realize, 25,000 BTU/hr is not an enormous amount of heat. This unit really is designed for use in a closed in space w/ minimal air curculation. The heating method is to raise the temperature of all objects in the radiant field so that the space stays warm. A breeze or draft will reduce it's ability to maintain the heat. The unit comes with a thermostat for mounting on a wall and setting a desired heat. I've eliminated the thermostat and just hard wired the unit. If it's cold enough to have it on, then I want it on. Mr. Heater advertises using the term "millivolt" ignition or something to this manner. This is misleading. This is not a electronic ignition unit!!! This means the unit has a pilot light. The pilot light heats a thermocouple which provides the "millivolt" current they refer to. The thermostat either "opens" or "closes" the circuit, depending on the temperature and thermostat setting. The "closed" loop opens a solenoid valve in the pressure regulator which releases the gas to the burner.

My unit is installed on a large covered patio outside approximately 8' above a sitting area. Sitting below the heater in a 8' diameter circle is nice and toasty, even with a slight breeze. Sitting across the table at 12' you can feel a slight warming effect with no breeze. More than 12' away....no impact. This is not a highly effective heater if used in an open space. As advertised....this is a garage heater. To get the heat I need I am adding a second heater across the patio from the first.

Clearances around the unit are important. I have 2' clear above my unit, and the lumber above the unit gets warmer than I would like. After 2 hours of use I can touch the wood with my bare hand without having to remove it, but it is quite warm. I'm thinking about 120 to 130F. I have some harditrim up there too and it is even warmer. Not too sure how long the paint will last.

Installation is a breeze. Includes a video if you need it, but there is essentially nothing to it.

Good buy....if it's what you need. If you are thinking of installing it outside......you may want to consider getting more BTU's.

I have used this in my garage for several years now, if I have my garage door closed it will warm the space pretty well. Directly under the heater its really nice and toasty, but the furthest corner of the garage will still be cold. In a 20-degree day with the garage door closed (I have a two-car garage with most of the garage walls NOT insulated), I get over 70 degrees directly under the heater (where I usually change the oil etc.) and at least 40 degrees at the coldest corner of the garage. Most of the garage becomes very comfortable to work in, that I usually don't even need to wear a jacket. BUT - as soon as I open the garage door, I lose all the warm air and it takes a little while to heat the whole place back up. That being said, I typically also let it run for an hour or so before I start working on my car, just so I know the area is nicely heated.

Hope that helps. :)

I purchased this heater about 2 years ago to keep my garage about the freezing level, principally to melt ice and snow from the cars, but also to provide a comfortable sleeping environment for my dog (and to keep his water from freezing). For this purpose, it works very well, and even keeps the snow melted from my snowthrower, which I keep on the opposite side of the garage. It was quite easy to install after getting all the proper fittings and hoses, which are not included.

I do have some complaints, which keeps me from giving this 5 stars.

1. Clearance is very important. When the burner ignites, I'm always alarmed because of the small ball of fire that the heater emits across the burner.

2. Because of the radiant heat nature, I have burned my hands while working under the heater, similar to getting a sunburn.

3. I've had problems with the pilot light going out. It is easily adjustable with a screwdriver, but is very sensitive and this was very annoying to fine-tune in the beginning. I still have to adjust it about once a year.

4. The garage always smells like natural gas.

This heater worked well in my situation, because I had natural gas stubbed into the garage when the house was under construction. Had I not done this, I would probably opt for an electric heater next time, and this means you need 220 volts. Depending on the size and type of heater, most also require some type of vent.

I would recommend this heater as it works as advertised for my 625 SF garage. However, I also recommend you explore other options first.

I have just gone through my 2nd unit with the same problem. My Carbon Monoxide alarm has been going off. Something with Mr. Heater's quality control or packaging is seriously wrong.

This isn't my first rodeo with this model. I bought one 6 years ago and worked with good success. No C.M. alarms....ever.
so when the original unit started emitting natural gas fumes, I was told my their tech support that it's almost cheaper to buy a new one. So I bought the exact same model recently.
When the new unit arrived, the valve assembly mount looked bent. Sure enough, it was burning extremely hot and out of control.
when the next replacement arrived, it looked fine. It also burned hotter than normal (flames over the top) and began emitting Carbon Monoxide.(set off my alarm)
Also the thermostat had to be set at 40 degrees to maintain 70 degrees.
Amazon has been very good about taking care of the problem with me. Hats off!
Mr. Heater on the other hand needs to not be so arrogant (based on my calls to tech support)and address their quality control problem!

Bought this to heat an insulated,2 bay garage/shop. Not bad it you are directly under it, but five feet out and your out of it's line of fire. It you turn it on 30-60 min earlier, you will take the chill off. Should have gotten the next size up, this would be great for a single car garage. Overall, it beats not having a heater.

Also, it does recommend you cut a "vent" in your wall above it and have an opening below it (like a window open a couple inches for ventilation.

I bought this heater to use outside on my patio instead of the standard propane heaters. I worked out great! I removed the pilot light assembly and plumbed the gas line directly to the heater. I added a valve so I could adjust the flow. To start the heater I turn on the gas and apply a lighter. It makes the system so simple and foolproof. I find this gives plenty of heat for a table outside on the patio.

I bought this for my indoor swimming pool. Even with the furnace heat you still need that extra warmth to make it feel like Miami Beach in NJ in January. I could not find a better looking heater and my only dislike is that this looks too much like a garage heater which it is. This unit comes with a thermostat and requires no electricity which would also be useful in the event of a power failure. I am still not sure how the thermostat manages to work without electricity.

I placed my unit so it casts the infra red heat right in the middle of the pool and has an effective floor area of about 18 by 18 feet when placed 15 feet above. Since the swimming pool is at the lowest level and cold air tends to settle to the lowest level this heater comes in very handy even when the water is heated and the furnace is blowing warm air. It also feels like the sun when you come out of the water even if you are wet. If you close your eyes you can almost imagine you were on a beach in Hawaii. I am thinking about buying another one for the deep end.

My husband bought this while I was on vacation, and after reading some of the reviews I was a little concerned. However, now that we have been using it for several months I am much more at ease with it. Our bedrooms are right over the garage and in the winter (we live in NE Ohio) they get extremely cold. He set the thermostat to keep the garage at 50 and the bedrooms have been much more comfortable this winter. We both have hobbies which require garage workbenches, and it quickly warms the work area when we turn it up. He even installed a "kill switch" so it turns off when the garage door opens, and we are not heating all of Stow. Overall very pleased.

purchased 2 Mr. Heater NG 25000BTU, the very 2nd week, one of the heater was not working, contacted the manufacture, and found out thermal coupling was bad, called the mfr. to see how to install, well, frankly put on hold and still holding. I am about to return both of the heaters.

I have this in my garage, walls are insulated, not ceiling yet and doors have big gaps. It ran for several hours while I wasn't in there an previous days to break it in and check it out. On another day, after an hour of working in the garage I was getting sick and headache, carbon monoxide poisoning. It stinks too. What do you expect when it's not vented? I learned my lesson the hard way. It says right in the instructions to leave a window open. Kind of defeats the purpose of heating if you ask me. Who wants cold air rushing across the floor of a garage when you're working out there? This is my second one because the first had flames coming through the honeycomb part. The second one did too. Checked and double checked pressures etc with a heating guy, after several phone calls the Mr. Heater tech says as long as the flames shooting out of the unit are blue it's OK. B.S.!! My MH40 doesn't, which incidentally stinks and causes CO build up without an open window. I scrapped both of them and paid a little more for a tube heater and blower type heater.

They might be fine for outdoors but I wouldn't use them indoors unless you want to lose some brain cells.