Mr. Heater MH42T 42,000-BTU Propane Tank-Top Radiant Heater
Mr. Heater MH42T 42,000-BTU Propane Tank-Top Radiant Heater
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 List Price: $181.04 Sale Price: $112.40 Availability: Usually ships in 1 to 2 months Eligible For Free Shipping 
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Product Description
The Mr. Heater MH42T 8,000-42,000 Btu triple heater is a step up from the two-burner model, giving you the flexibility of using one, two, or three burners. The unit mounts directly to 20- to 100-pound cylinders. It uses infra-red heat, which means that it warms the objects in front of it, not the surrounding air. This gives you more heat per Btu, which means that using all three burners at the highest of the three settings will keep you warm even in miserably cold situations. Each element shuts off automatically with loss of flame. Do not use in unventilated areas. One-year limited warranty.--Josh Dettweiler
What's in the Box
Heater (manifold with safety shutoffs and orifices, twelve-inch thermocouple lead, plenum assembly, screen assembly, bolt set, replacement regulator with soft nose POL, reflector, wire guard, metal ring, collar mounting bracket assembly, hose assembly/less regulator, replacement safety shutoff with orifice, locking knob, bold with seal washer, plenum assembly with clip), owner's manual
Five Tips for Buying a Heater
Choosing a space heater is a matter of sifting through a bewildering array of types, power ratings, and fuel sources. Let's break it down a little to make the process easier.
What are the different types of space heaters?
- Radiant heaters emit infrared radiation that directly warms the objects in front of the heaters (rather than the surrounding air). If you only need heat by a desk or in a small section of a room, a radiant heater is quiet and will use very little power.
- Forced-air heaters use a fan to blow air that has been warmed by metal or ceramic heating elements. A forced-air heater is appropriate for quickly heating up a small- to medium-sized room, but can be noisy.
- Convection heaters draw cold air from the floor; the air is warmed by heating coils and emitted from the top of the heater. A convection heater is appropriate for quickly heating up a small- to medium-sized room, but also can be noisy.
- Radiators work by heating oil enclosed in a reservoir, gradually heating the surrounding air. If heating speed isn't an issue, you might want to opt for a radiator. These are extremely quiet and effective--perfect for bedrooms.
Should I buy an electric or a combustion model?
If you want a heater that will be available in emergencies, or that can heat areas larger than a single room, choose a "combustion" model--one that is powered by a gas or fuel like propane, kerosene, natural gas, or diesel. Which fuel type you choose depends largely on convenience and local availability. For example, diesel would be appropriate for a heater you take with you on long car trips.
How powerful a heater do I need?
Heaters are rated by BTU, which stands for British Thermal Unit (the amount of heat needed to heat one pound of water by 1 degree F). To find out how many BTU you need:
- Calculate the volume of the space to be heated by multiplying square footage by height.
- Multiply that number by 4 if your insulation is poor, 3 if it's average, or 2 if it's good.
Do space heaters cost a lot to operate?
As a general rule, electric space heaters are more expensive to use than combustion models. To ensure energy efficiency, a thermostat is a must-have feature for any heater. For radiant heaters, models with a 360 degree heating surface can heat larger spaces. If you need a forced-air heater, models with ceramic elements tend to be more efficient.
Are space heaters a fire hazard?
Space heaters are implicated in about 25,000 residential fires every year. To ensure proper safety, always follow the manufacturer's usage instructions and fill out the warranty card to receive informational updates from the manufacturer. Also, look for extra safety features such as an automatic shutoff switch that can shut down the unit if, for example, it gets upended. In addition, choose a model where the heating element is adequately enclosed within the unit.
Details
- 8,000- to 42,000-BTU triple tank-top propane infrared heater
- Operate 1, 2, or 3 burners at a time; runs up to 10 hours on low setting
- Efficient infra-red heat warms objects directly, not surrounding air
- For outdoor use only; shuts off automatically with loss of flame for safety
- Measures 15-3/4 by 6-1/2 by 22-1/2 inches; 1-year limited warranty
What's in the Box
Heater (manifold with safety shutoffs and orifices, twelve-inch thermocouple lead, plenum assembly, screen assembly, bolt set, replacement regulator with soft nose POL, reflector, wire guard, metal ring, collar mounting bracket assembly, hose assembly/less regulator, replacement safety shutoff with orifice, locking knob, bold with seal washer, plenum assembly with clip), owner's manual
Five Tips for Buying a Heater
Choosing a space heater is a matter of sifting through a bewildering array of types, power ratings, and fuel sources. Let's break it down a little to make the process easier.
What are the different types of space heaters?
- Radiant heaters emit infrared radiation that directly warms the objects in front of the heaters (rather than the surrounding air). If you only need heat by a desk or in a small section of a room, a radiant heater is quiet and will use very little power.
- Forced-air heaters use a fan to blow air that has been warmed by metal or ceramic heating elements. A forced-air heater is appropriate for quickly heating up a small- to medium-sized room, but can be noisy.
- Convection heaters draw cold air from the floor; the air is warmed by heating coils and emitted from the top of the heater. A convection heater is appropriate for quickly heating up a small- to medium-sized room, but also can be noisy.
- Radiators work by heating oil enclosed in a reservoir, gradually heating the surrounding air. If heating speed isn't an issue, you might want to opt for a radiator. These are extremely quiet and effective--perfect for bedrooms.
Should I buy an electric or a combustion model?
If you want a heater that will be available in emergencies, or that can heat areas larger than a single room, choose a "combustion" model--one that is powered by a gas or fuel like propane, kerosene, natural gas, or diesel. Which fuel type you choose depends largely on convenience and local availability. For example, diesel would be appropriate for a heater you take with you on long car trips.
How powerful a heater do I need?
Heaters are rated by BTU, which stands for British Thermal Unit (the amount of heat needed to heat one pound of water by 1 degree F). To find out how many BTU you need:
- Calculate the volume of the space to be heated by multiplying square footage by height.
- Multiply that number by 4 if your insulation is poor, 3 if it's average, or 2 if it's good.
Do space heaters cost a lot to operate?
As a general rule, electric space heaters are more expensive to use than combustion models. To ensure energy efficiency, a thermostat is a must-have feature for any heater. For radiant heaters, models with a 360 degree heating surface can heat larger spaces. If you need a forced-air heater, models with ceramic elements tend to be more efficient.
Are space heaters a fire hazard?
Space heaters are implicated in about 25,000 residential fires every year. To ensure proper safety, always follow the manufacturer's usage instructions and fill out the warranty card to receive informational updates from the manufacturer. Also, look for extra safety features such as an automatic shutoff switch that can shut down the unit if, for example, it gets upended. In addition, choose a model where the heating element is adequately enclosed within the unit.
Filed under Patio Heaters by on Dec 15th, 2010. Comment. 
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Comments on Mr. Heater MH42T 42,000-BTU Propane Tank-Top Radiant Heater
Rating
I’ve had my triple Mr. Heater for one full winter (0 to 30 degree nights/days in Kansas). It does a nice job of heating my two-car garage, even with the double wide door being opened periodically. My only complaints are that one of the burners occasionally goes out (but is easily relit) and it “sings” once in a while as it heats up. Apparently the difference in metal expansion as the three burners are lit individually and warm up at a slightly different rate, causes some kind of harmonic and it “sings” until everything has warmed up completely. No big deal. If ya wanna get warm fast, this is the heater for you.
Rating
The triple burner Mr. Heater works wonderfully! Now this is what you call a radiant heater! Prior to purchasing Mr. Heater I was using a Bernzomatic patio heater (that cost significantly more) that didn’t heat very well – I had to practically hug the Bernzomatic to feel heat. The triple burner Mr. Heater keeps me toasty warm! I love the red glow it gives off too! I installed Mr. Heater on a 40 lb. propane tank – this is just the right height to keep me warm while on my deck swing.
Mr. Heater isn’t a particularly stylish unit – however, it sure does heat well!
I have a few minor criticisms; overall I’m very happy -
During my first week using Mr. Heater the burners kept shutting off – they would not stay lit for very long. I adjusted the thermocouples to position them closer to the burner and I haven’t had a problem since.
Mr. Heater doesn’t work very well in wind – it works fine in a breeze or a little bit of wind. I tried to use it on my deck in a storm with fairly gusty winds – not a good idea. The wind tended to cause the burner to ignite the chamber that carries the gas to the burner. If this happens – you’ll know it.
It’d be really nice to have an electric ignition! The two burner model has this; however I really wanted a maximum amount of heat – I wanted the three burners.
It’d be really nice if the propane tank mounting hardware was adjustable for height. If I mounted Mr. Heater on a 20 lb. propane tank it’d simply be too short to set next my patio table or swing. If you could adjust the height a couple of feet that’d be nice – you can probably jerry rig something.
Overall, it heats great – an excellent value too, in relation to the cost of patio heaters (which is what I use this for).
******* 2//2010 Update *******
While it’s been a great product the last couple years, another issue has become evident. Mr. Heater is not rust resistant! It’s rusted to the point that I can’t use it anymore. I kept it in an enclosed screened in porch so it was never exposed directly to rain. However, rain that was blown in and the summer humidity has had a big impact. I’ve replaced Mr. Heater with another manufacture’s version that doesn’t rust.
Rating
Excellent product, very quiet, warm with option to have 1, 2 or 3 heads on at any time.
Rating
The triple burner Mr. Heater delivers excellent heat. It lights easy, but a electronic ignition would be nice. Gas usage is close to the specs listed. My only complaint like one of the other reviewers listed, some of the burners will shut off sometimes for no reason on low heat. Maybe i just need to adjust the thermocouples.
Rating
Heater is everything it is described to be. Works great, heats up 2 car garage quickly. Normally have to shut it down to a single head as the garage becomes too warm. Very quiet during operation, nearly silent. The only thing lacking is auto ignition, you need to light with a match or lighter. I did add a Coleman lantern flint ignitor to one of the heads. I used the match hole to mount it, and it works great to light that head. Need to find 2 more around here to add to the other 2 heater heads. I would recommend this heater to anyone looking for one.
Rating
Works great. Amazon was by fare the cheapest price i found for this. This MR Heater really puts out the heat. Lighting it was hard at times. I would use a grill lighter, that works a lot better. Even with the lighter holes in extreme cold it’s sometimes not easy to light. If you can get a flame right on the burner it lights easy every time. I also thought if you had one or two burners going, you didn’t need a lighter to light another burner. This is not the case, i had to use the lighter. I let the gas run for a bit but it wouldn’t light up. I still remain happy with this buy.
Rating
I bought this heater to use at swim meets and have used it twice so far. It is easy to light, can be adjusted to use 1 to 3 burners and puts out allot of heat. I have had several inquiries from other swim parents about where I got this heater because it works so good. The only problem has been that two of the burners went out by themselves. Not sure why that happened but it may have been related to wind etc.
So far very happy with this product. Highly reccomend for anyone needing heat for outdoor sporting events during the winter months. Be careful around very young children as the burners get extremely hot.
Rating
I use this in my shop which is not well insulated. It takes the bitter cold off and gives a warming location. Nice that you can run 1,2, or 3 burners on low, medium, or high for a variety of heat levels. Nice and solid mount on the bbq tank. Burns through the tank about as advertised, maybe 10 – 12 (guessing from limited use) hours or so on the high setting with all 3 burners on, scale down from there with the lower settings or less burners.
The only negative I see is that once you start more than one burner, and want to go to a lower number of burners running, you have to shut the whole thing down and let it cool and then light the burner(s) you want. Frankly this doesn’t happen to me as I need all 3 all the time for now.
Rating
This is an excellent heater for patios and decks. Heats people very quickly. Very easy to install and operate. Low noise. Almost no fumes.
Rating
I have owned Mr Heaters since 1992, They are durable and easy to use, the only con is each burner is not independantly controlled. Great product, and NO issues dealing with Amazon.