Operating Guide

www.mrheater.com Mr. Heater Inc. 4560 West 160th St. Cleveland, Ohio 44135 • 800-251-0001
L312
BTU/HR
22,000*
25,000*
40,000*
40,000*
TOP
14”
14”
34”
34”
SIDES
16”
16”
30”
30”
BACK
12”
12”
30”
30”
BELOW
48”
48”
68”
68”
TOTAL
DIMENSIONS
LxWxH (INCHES)
29
3
/
4
x 12
1
/
4
x 7
29
3
/
4
x 12
1
/
4
x 7
30
1
/
4
x 19
1
/
4
x 12
30
1
/
4
x 19
1
/
4
x 12
TYPICAL
MOUNTING
HEIGHT
7’-9’
7’-9’
10’-12’
10’-12’
SHIPPING
WEIGHT
(LBS)
25
25
25
25
SPECIFICATIONS & TECHNICAL DATA
MOUNTING CLEARANCE TO
COMBUSTIBLES
DO NOT use heater in sleeping quarters, mobile homes, or recreational vehicles.
HIGHLY EFFICIENT AND
COST EFFECTIVE RADIANT HEAT.
HIGHLY EFFICIENT AND
COST EFFECTIVE RADIANT HEAT.
CSA Certified
Thermocouple generates power from
pilot flame for gas control, automatically
shuts off gas if pilot light goes out.
Aluminized steel burner
plenum houses venturi and baffles,
enabling air-gas mixture to produce
constant grid combustion with
no wasted fuel.
Aluminized steel burner plenum houses venturi and
baffles, enabling air-gas mixture to produce
constant grid combustion with no wasted fuel.
Reflector concentrates
infrared rays where needed.
MODEL NUMBER
MH25LP
Stock Number: F272100
MH25NG
Stock Number: F272200
MH40LP
Stock Number: F272700
MH40NG
Stock Number: F272800
• Efficient Infrared Heat- Directly heats people and objects
which in turn heats surrounding air to desired temperature
• Economical - No electricity required
• Instant Heat - Includes adjustable thermostat for
individually controlled warmth
• Heating Area - MH25: Up to 600 sq. ft.
MH40: Up to 850 sq. ft.
• Quiet, Clean, Odor-Free Operation - Propane or natural gas
• Maintenance Free - No moving parts to service
• Includes Wall Louver For Fresh Air Intake
• CSA Certified
• Limited 1-Year Warranty - On gas control
• Pro-Rated 5-Year Warranty - On burner assembly
Gas supply connection is
1/2” dia. (NPT) gas pipe.
Chrome-plated, steel grill protects
burner from any damaging object.
Welded wall mounting bracket
simplifies installation.
Millivolt powered thermostat adjusts
for individual comfort levels.
No electricity required.
GAS
INLET
1
/
2
”
1
/
2
”
1
/
2
”
1
/
2
”
MANIFOLD
PRESSURE
10”
6”
10”
5.8”
MH40LP/NG
MH25LP/NG
* Ratings shown are for elevations up to 2,000 feet. (In Canada, refer to rating tag.) For elevations above 2,000 feet, ratings should be reduced
at the rate of 4% for each 1,000 feet above sea level or as specified by local authority having jurisdiction.