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Operating Instructions and Owner’s Manual
Mr. Heater | Gas-Fired Low-Intensity Infrared Heater
BEFORE YOU BEGIN
Read this manual carefully before installing or servicing this 
equipment. Improper installation, servicing or maintenance will 
cause death, injury or property damage. Check the minimum 
required safe distances from combustibles given on the outside 
of each burner to make sure that the product is suitable for your 
application. The minimum required safe distances from combustibles 
is also found on page 9 of this manual. Installer must be a licensed 
contractor of representative. After the installation is complete, check 
product operation as provided in these instructions. 
Unpacking the Heater
Manpower Requirements
To prevent personal injury and damage to the heater, two persons 
will be required to remove the heater from the carton. Both ends of 
the heater should be lifted from the carton at the same time. The 
burner box should be lifted by gripping the bottom of the box. The 
reflector end of the heater should be lifted using the rear moveable 
hanger. 
Safety
Thin sheet metal parts, such as the reflector portion of the heater 
and the various venting components, have sharp edges. To prevent 
injury, the use of work gloves is recommended. The use of gloves 
will also prevent the transfer of body oils from the hands to the 
surface of the reflector.
Vent Kit (F102840)
 1. (2) 3' x 2' Pipe 26GA. 
 2. (1) 36' x 3' B-Vent 
 3. (1) Gas Vent Top 3' 
 4. (1) Adj. Wall Thimble 
 5. (1) Storm Collar
 6. (1) 3' Elbow
 7. (1) Adj. Roof Flashing 
Section 1 INTRODUCTION
About The Heater
The MHT 45 is a factory-assembled, gas fired, low-intensity heating 
system. The system has been designed for easy installation and will 
provide years of economical operation and trouble-free service. Not 
only is infrared heat efficient, it also provides the most comfortable 
conditions in open areas, such as garages.
Gas-Fired means it uses clean-burning Natural or LP gas.
Low-Intensity means that the radiant surface of the heat exchanger 
tube does not glow red. Instead, it operates at a lower temperature 
(less than 1000 F) and radiates energy at a lower intensity per square 
foot of radiating surface. The lower temperature and intensity 
levels are within a range that is most effective in establishing and 
maintaining personal comfort levels. An aluminum reflector directs 
the radiant energy downward to the occupied area.
Radiant refers to the energy radiated by the tube heater. Because 
the energy is in the form of infrared rays, it does not directly heat the 
air. Instead, the rays heat objects such as the floor, cars, machines 
and people. The warm objects, in turn, heat the air. These combined 
features are the key to the exceptional comfort and fuel efficiency 
provided by the tube heater.
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Available Accessories
561 HVACPro
Users Manual
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wall you should find parallel isothermal rows indicating the location of heat tubes below the surface. 
Perpendicular to the outside wall, you should find rising and falling temperatures at equal distances. High 
temperatures indicate you are scanning a heat tube beneath the floor surface, low falling temperatures 
indicate a space between the heat tubes. 
1.
Press
D
and then press
A
to select HI emissivity.
2.
Press
C
and then press
A
to select MIN.
3.
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To locate radiant heat tubes in floor, temporarily elevate the loop temperature to create hotter spots 
for identifying tubing runs. 
4.
Before releasing trigger, press
A
to toggle between MIN, MAX, DIF floor temperatures and record
the temperatures for future comparison and trending under similar conditions.
Testing Radiant Heat Applications
1.
Operate radiant heat loop until steady state conditions are achieved.
2.
Attach the thermocouple to supply of radiant loop.
3.
Record the supply temperature.
4.
Attach thermocouple to return of radiant loop.
5.
Record the return temperature.
6.
Difference is Delta-T (temperature difference).
7.
Repeat for each loop to zone and balance for equal Delta-T’s.
Testing Water Heater Insulation
1.
Connect thermocouple probe to obtain ambient temperature near water heater.
2.
Press
D
and then press
A
to select HI emissivity for vinyl jacketed insulation or painted metal
jacketed water heaters.
3.
Press
C
and then press
A
to select DIF.
4.
Aim the Thermometer at the water heater.
5.
Scan the water heater jacket.
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6.
Scan in horizontal rows from top to bottom
7.
Press
C
and then press
A
to read MAX and DIF jacket temperatures. Record your readings.
•
The closer the jacket temperature is to ambient temperature, the less jacket losses there are.
•
Standby losses account for a majority of the water heater energy expenses. Increase water 
heater insulation to reduce standby losses. 
•
Standby losses are losses when water is not being re-heated by the burners or the elements. 
When the water heater is idle (standing by) and no water is being drawn, heat loss through the 
jacket (and flue on oil/gas systems) are waste heat losses that can be reduced by increasing 
insulation and/or lowering the temperature setting. 
Testing Steam Traps
Steam traps open on low temperature to allow steam flow to trap. Steam traps close at steam temperatures 
to stop steam flow. As steam temperature drops, traps open to allow more steam flow and to return 
(“drain”) condensate. 
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•
If temperature is low in steam pipe, low in trap and low in condensate return, trap may be stuck 
closed. If temperature is high in steam pipe, high in trap, and high in condensate return, trap may be 
stuck open. 
•
If temperature is high in steam pipe, high in trap, and slightly lower in condensate return, trap is 
probably operating properly.