•Chapter 2 provides heater installation requirements and information, such as: a) minimum distances from heater components to combustible materials, b) heater mounting requirements, c) venting requirements, d) fuel supply requirements, e) thermostat mounting.

•Chapter 3 covers startup, operation, and shutdown of the heater.

•Chapter 4 provides operator maintenance instruc- tions such as: troubleshooting, adjustments, powerpile replacement and operator checks.

•Chapter 5 provides warranty and replacement parts information.

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.

•Contact factory when appliance is to be installed at high altitudes. Factory supply high altitude conver- sion kit with instructions and data plate.

•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:

5.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 ob- tained from either the: Canadian Standards Association, 8501 East Pleasant Valley Road,

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 equipment. For assistance or additional information consult a qualified installer, service agency, or gas supplier.

•For additional information contact: The factory.

•The following extra NFPA Manuals are helpful when installing this heater in a location not anticipated in this manual:

Number

Related Subject

NFPA 88

Clearances to Combustible Surfaces

NFPA 409 Clearances to Combustible Surfaces

DO NOT EXCEED 1/2 PSI INLET PRESSURE TO HEATER

Table 1. BTU Ratings and Supply Pressures

MODEL

BTU/HR. RATING

 

 

GAS SUPPLY PRESSURE (W.C.)

 

ORIFICE

 

NO.

 

GAS

 

MIN.

MAX.

 

MANIFOLD

SIZE

 

 

NATURAL

PROPANE

NAT.

 

L.P.

NAT.

 

L.P.

NAT.

L.P.

NAT.

 

L.P.

MH/HS25NG

25,000

—

7.0"

 

—

14"

 

—

6"

—

45

 

—

MH/HS25LP

—

22,000

—

 

11"

—

 

14"

—

10"

—

 

55

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Table 2. Heater Dimensions and Orifice Sizes

MODEL

OPERATING

ORIFICE SIZE

INPUT

 

 

SIZE

 

 

NO.

PRESSURE

BURNER

PILOT

BTU/H

WIDTH

LENGTH

 

HEIGHT

WEIGHT

 

 

 

 

 

 

 

 

 

 

 

 

MH/HS25NG

6.0"w.c.

45

.018

25.000

12-1/4"

29-3/4"

 

7"

20 lb.

MH/HS25LP

10"w.c.

55

.011

22,000

12-1/4"

29-3/4"

 

7"

20 lb.

 

 

 

 

 

 

 

 

 

 

 

Model # MH25NG/LP

HS25NG/LP

4 Installation instructions and Owner’s Manual

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Mr. Heater MH25LP / MH25NG General Information, BTU Ratings and Supply Pressures, Heater Dimensions and Orifice Sizes
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MH25LP / MH25NG specifications

The Mr. Heater MH25LP and MH25NG portable heaters are designed for anyone looking to efficiently heat small to medium-sized spaces, whether indoors or outdoors. These heaters are known for their reliability and effectiveness, making them popular choices for residential use, outdoor activities, and emergency heating scenarios.

The MH25LP is the propane model, while the MH25NG utilizes natural gas, providing versatility in fuel options to cater to different preferences and availability. Each unit is fitted with essential safety features, including an oxygen depletion sensor and an accidental tip-over shutdown system, ensuring peace of mind during use.

One of the main features of the Mr. Heater MH25 series is its impressive heating capacity. The units can produce up to 25,000 BTU per hour, sufficient for heating spaces up to 600 square feet, making them ideal for workshops, garages, cabins, and various outdoor activities. The adjustable heat settings allow users to customize the temperature to suit their comfort level, maximizing efficiency and reducing fuel consumption.

The design of the MH25 heaters emphasizes user convenience. Both models are lightweight and portable, which allows for easy transportation from one location to another. They come equipped with comfortable carrying handles, enhancing their usability for outdoor events, camping trips, or simply moving from room to room.

Another significant feature of the Mr. Heater MH25 series is the sophisticated combustion technology employed. The heaters utilize a radiant heating system that effectively warms objects and people in the room rather than just the air, leading to faster heating times and a more comfortable environment. Additionally, the units are designed with a sturdy and durable construction that ensures longevity, withstanding the rigors of outdoor use.

The units are also designed to operate quietly, making them an excellent choice for environments where noise levels need to be kept to a minimum, such as in personal workshops or while camping.

Overall, the Mr. Heater MH25LP and MH25NG are powerful, safe, and portable heating solutions that provide reliable warmth and comfort in various settings. Their combination of efficient heating, portable design, and safety features makes them an essential tool for anyone needing reliable heating solutions. Whether for everyday use or special events, these heaters stand out as dependable options to keep warm.
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