General Information, Number Related Subject

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 name- plate.

•Upon receipt and prior to attempting installation, be sure to inspect the heater and its packaging for damage and/or missing components. If dam- age is found or missing components are sus- pected, 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 gov- erning 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.

•Contact factory when appliance is to be installed at high altitudes. Factory can supply high altitude conversion 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:

WARNING: Improper installation, adjustment, al- teration, service or maintenance can cause property damage, injury or death. Read the installation, opera- tion, 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 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 Related Subject

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.

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

Installation instructions and Owner’s Manual

HS25NG/LP, MH25NG/LP specifications

The Mr. Heater HS25NG/LP and MH25NG/LP are reliable and efficient heating solutions designed for both residential and commercial spaces. These powerful units deliver warmth and comfort, making them ideal for garages, workshops, and outdoor settings.

One of the standout features of the HS25NG and MH25NG is their versatility in fuel options. The HS25NG is designed to use natural gas, while the MH25NG operates on propane, providing flexibility based on user needs and availability. This adaptability allows users to select the most convenient and cost-effective energy source for their heating requirements.

Both models are equipped with a robust heat output, with the capability to deliver 25,000 BTUs per hour. This level of performance ensures quick heating even in larger spaces, establishing a comfortable environment in minimal time. The units also feature a wide heating area that can efficiently cover spaces up to 600 square feet, making them suited for various applications.

User safety and efficiency are paramount in the design of these heaters. The HS25NG and MH25NG come with an automatic shutoff system that activates if the unit tips over or detects any obstruction to airflow. Additionally, they are equipped with a built-in piezo ignition system, enabling easy and reliable lighting without the need for matches or an external ignition source.

The heaters also incorporate advanced technology to optimize performance. Their infrared heating design allows for direct and efficient warmth, minimizing energy loss and ensuring that heat is directed where it's needed most. This not only enhances efficiency but can also lead to reduced energy costs over time.

Both models are designed with portability in mind, featuring a lightweight construction and convenient carry handle, making it simple to move the unit from one location to another as needed. The durable construction ensures that they can withstand the rigors of frequent use, whether it be in a workshop or an outdoor gathering.

In summary, the Mr. Heater HS25NG/LP and MH25NG/LP are powerful, versatile, and reliable heating solutions that combine advanced technology with user-friendly features. With their strong heat output, safety features, and option for both natural gas and propane, these heaters are an excellent choice for those looking for efficient heating in any environment.