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3. GENERAL INFORMATION
• Your heater comes fully assembled and is tested at
the factory with the appropriate type of gas and at
the input pressures stated on the nameplate.
• Upon receipt and prior to attempting installation,
be sure to inspect the heater and its packaging for
damage and/or missing components. If damage is
found or missing components are suspected, contact
your dealer. See Chapter 5 for a complete listing of
items required for the safe and efficient installation
and use of this heater.
• Never attempt to operate the heater using a
fuel other than that specifically identified on the
nameplate.
• The installation of the heater must conform with
all local building codes or, in absence of governing
local codes, with the National Fuel Gas Code, ANSI
Z223.1 (NFPA 54). This code can be obtained from
either the Canadian Standards Association, 8501
East Pleasant Valley Road, Cleveland, OH 44131; or,
NFPA, Battery March Park, Quincy, MA 02269.
• Canadian installations must comply with CAN/
CGA-B149.1.2 gas code which can be purchased from
Canadian Gas Association, 55 Scarsdale Road, Don
Mills, Ontario M3B 2R3.
• A plugged 1/8" N.P.T. Test Gage Connection is
provided on the heater gas control.
• See Tables 1 and 2 for heater specifications:
Table 1. BTU Ratings and Supply Pressures
MODEL
NO.
NATURAL (NAT.)
MH25NG
25,000
MH22LP
-
OPERATING
MODEL
PRESSURE
NO.
MH25NG
6.0" W.C.
MH22LP
10" W.C.
Gas Fired Infrared Workshop Heater
BTU/HR. RATING
GAS
PROPANE (L.P.)
-
22,000
Table 2. Heater Dimensions and Orifice Sizes
ORIFICE SIZE
BURNER
PILOT
45
0.016
55
0.012
WARNING: Improper installation, adjustment,
alteration, service or maintenance can cause
property damage, injury or death. Read the
installation, operation, and maintenance
instructions thoroughly before installing or servicing
this heater. For assistance or additional information
consult a qualified installer, service agency, or gas
supplier.
• For additional information contact Mr. Heater Toll-
Free 800-251-0001—www.mrheater.com
The following extra NFPA Manuals are helpful when
installing this heater in a location not anticipated in this
manual:
Number
NFPA 88
Clearances to Combustible Surfaces
NFPA 409
Clearances to Combustible Surfaces
DO NOT EXCEED 1/2 PSI INLET PRESSURE TO
HEATER
Provide adequate clearance to combustibles per Table 3
at control end of heater for servicing and minimum on
top and sides for ventilation and combustion air supply.
A minimum clearance of 8' above floor for public
garages in accordance with NFPA No. 88 most recent
edition, or Figure 1; whichever is larger.
Canadian installations in public garages must comply
with CGA 149B.1.9 most recent edition.
WARNING: Maintain clearances as shown in
Figure 2 or on heater nameplate.
GAS SUPPLY PRESSURE (W.C.)
MIN.
MAX.
NAT.
L.P.
NAT.
L.P.
7.0"
-
14"
-
1 1"
-
14"
INPUT
BTU/H
WIDTH
25,000
12-1/4"
22,000
12-1/4"
E4
Operating Instructions and Owner's Manual
Related Subject
MANIFOLD
NAT.
L.P.
-
6"
-
-
10"
SIZE
LENGTH HEIGHT WEIGHT
29-3/4"
7"
29-3/4"
7"
20 lb.
20 lb.
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