Connecting Heater to GAS Supply | Mr. Heater MH25NG/LP, HS25NG/LP

THERMOSTAT

POWERPILE GAS VALVE

POWERPILE GENERATOR

Figure 4. Connection Diagram

Refer to National Electrical Code NFPA70-1993 and for Canadian installations to current CODE C22.1-

3. CONNECTING HEATER TO GAS SUPPLY

WARNING: Depending on local codes and require- ments and the installer’s skill level, the sizing and installation of gas lines required to safely and efficiently supply the heater may require the assistance of a pro- fessional. If in doubt as to these requirements, discuss the requirements of this manual with the dealer from whom the heater was purchased and your gas supplier.

3.1Gas Supply Requirements

•See Tables 1 and 2 for gas supply minimum, maxi- mum, operating, and manifold pressures for both heater models. Pressures are provided in inches of W.C. (water column). Also, see heater rating plates located on the heater.

WARNING: Model MH/HS25NG is designed to burn natural gas and it comes equipped with a regulator. The regulator is built into the gas valve. The maximum inlet pressure to this regulator is 1/2 psi (14 in. W.C.) If gas line pressure exceeds 1/2 psi, then an additional regulator must be installed before the heater/regulator to step down the pressure to a maximum of 1/2 psi.

•Most residential natural gas services provide a line pressure of 4 oz. (6.9 in. W.C.). If in doubt consult your natural gas supplier.

•To ensure the best performance from your natural gas heater make sure the supply manifold pres- sure is at least 6” W.C.

WARNING: Model MH/HS25LP is designed to burn liq- uefied petroleum (LP) gas and it comes equipped with a regulator. The regulator is built into the gas valve. The maximum inlet pressure to this regulator is 1/2 psi (14 in. W.C.). If gas line pressure exceeds 1/2 psi, then an additional regulator must be installed before the heater/ regulator to step down the pressure to a maximum of 1/2 psi.

•To ensure the best performance from your LP gas

heater, make sure the supply manifold pres- sure is at least 1/2 psi (14 in W.P.).

3.2 Piping Requirements

All piping installed must comply with local codes and ordinances or with National Fuel Gas Code,

ANSI Z223.1 (NFPA 54), whichever takes precedence. When installing piping, the following requirements must be taken into consideration: Canadian installa- tions must comply with the B149.1.2 Gas Code.

•Use new properly reamed black pipe free from chips.

•Apply a good quality pipe compound to all male threads as shown in Figure 5 prior to as- sembly. If LP gas is the fuel, ensure that pipe compound is resistant to LP gas. Do not use Teflon™ tape.

USE MODERATE AMOUNT OF PIPE DOPE

LEAVE 2 THREADS BARE

Figure 5. Pipe Compound Application

•Male threads on pipe to be installed into gas valve shall meet the requirements of Figure 6. Threads longer than those shown in the figure may cause gas valve distortion and malfunc- tion.

•A sediment trap meeting the typical require- ments of Figure 7 shall be installed in the line to the gas valve.

•A dedicated shutoff valve for the heater must be installed in the gas supply line.

3.3Piping Installation

While ensuring that all of the above gas supply re-

3/4” MAXIMUM THREAD LENGTH

1/2” BLACK PIPE

GAS VALVE BODY

1/2” MAXIMUM

DEPTH OF IN- SERTS INTO GAS VALVE

Figure 6. Gas Valve Connection Requirements

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.