C. Gas Pressure

Proper input pressures are required for optimum appliance performance. Gas line sizing requirements need to be made following NFPA51.

WARNING

Fire Risk

Explosion Risk

High pressure will damage valve.

•Disconnect gas supply piping BEFORE pressure testing gas line at test pressures above 1/2 psig.

•Close the manual shutoff valve BEFORE pressure testing gas line at test pressures equal to or less than 1/2 psig.

WARNING

CHECK FOR GAS LEAKS

Fire Risk

Explosion Risk

Asphyxiation Risk

•Check all fittings and connections.

•Do not use open flame.

•After the gas line installation is complete, all connections must be tightened and checked for leaks with a commercially available, non-corrosive leak check solution. Be sure to rinse off all leak check solution following testing.

Fittings and connections may have loosened during shipping and handling.

High Altitude Derate

In the USA, input BTU shall be derated 4% (one orifice size) per 1000 feet for altitudes above 2000 feet. In Canada, input BTU shall be derated 10% (two orifice sizes) at altitudes from 2000-4500 feet.

•Gas Supply Pressure: Minimum inlet gas supply pressure must be 3.5 in. W.C. for the purpose of input adjustment. Maximum inlet gas pressure must not exceed 10.0 in. W.C. The gas line supplying the appliance must be sufficient size to furnish the appropriate supply pressure to the appliance while operating in the “High” setting. (Minimum line ID of 1/2 in. required if the line is longer than 20 ft.

•Gas Line Pressure Test: Perform pressure test according to state and local code (if pressure exceeds 1/2 in. psi [3.5 kPa]) before appliance is connected. Be sure to release air pressure from the gas line before connection is made to the appliance.

•Gas Leak Test: Make sure the gas connections are tight. Turn on the gas and coat each joint with a non-corrosive gas leak check solution. Air bubbles will form indicating any leaks. DO NOT USE A FLAME OR ANY TYPE OF IGNITION SOURCE TO CHECK FOR LEAKS. All leaks must be corrected before proceeding with installation.

•The appliance must only be installed in a solid-fuel burning fireplace with the flue damper clamped open. The fireplace must be constructed of non-combustible material.

•The minimum permanent free opening (in square inches) that must be provided by the fireplace chimney or damper to vent the flue gases is provided in Table 1. If the free opening is smaller than the specified area, do not use this appliance.

•The damper must be removed or fixed in a manner in which will secure it open. Some jurisdictions require the damper to be removed or permanently welded fully open. Check with state and local codes.

•Be sure that the chimney is completely unobstructed to ensure proper ventilation of flue gases including carbon monoxide (CO). CO (a poisonous gas) is tasteless, odorless, colorless and undetectable without proper equipment.

Hearth & Home Technologies • Fireside Burner/Hearth Kits • 4004-304 Rev C • 08/2010

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Hearth and Home Technologies STMHK24NG Gas Pressure, Fire Risk Explosion Risk Asphyxiation Risk, High Altitude Derate
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MHK18NG, STMHK24NG, MTMHK18NG, MHK24NG specifications

Hearth and Home Technologies has consistently delivered innovative heating solutions, and their line of gas fireplaces is no exception. The MHK24NG, MTMHK18NG, STMHK24NG, and MHK18NG models exemplify the brand's commitment to quality, efficiency, and style.

The MHK24NG is a powerful natural gas fireplace that boasts a heat output of up to 29,000 BTUs. Its clean lines and contemporary design make it a perfect addition to modern spaces, while the impressive heat output ensures warmth in larger rooms. An included hand-held remote control adds convenience, allowing users to adjust settings without leaving their seats.

Similarly, the MTMHK18NG offers versatility with a slightly smaller footprint, providing up to 20,000 BTUs. Designed for easy installation, this model features an adjustable flame and a variety of decorative media options, allowing homeowners to customize the look of their fireplace. The MTMHK18NG's compact size makes it an excellent choice for smaller rooms or apartments, where space is at a premium.

The STMHK24NG combines traditional aesthetics with modern technology. It provides a remarkable 32,000 BTUs and includes advanced safety features, such as a built-in oxygen depletion sensor, which automatically shuts off the gas supply if it detects low oxygen levels. This model also provides an array of interchangeable front options, ensuring that it can complement any home decor or personal style.

The MHK18NG rounds out the lineup with its unique balance of efficiency and design. With a heat output of 18,000 BTUs, this fireplace is ideal for those seeking a cozy atmosphere without excessive energy consumption. It is equipped with an easy-to-use remote control and features such as adjustable flame height and temperature control, making it a user-friendly option for all home styles.

All four models are designed with energy efficiency in mind, meeting rigorous Environmental Protection Agency standards. They contribute to reduced energy consumption while providing ample warmth. The use of advanced gas technology in these fireplaces ensures consistent performance and reliable operation throughout their lifespan.

In summary, Hearth and Home Technologies’ MHK24NG, MTMHK18NG, STMHK24NG, and MHK18NG gas fireplaces showcase the perfect blend of style, technology, and performance. Whether enhancing the comfort of a contemporary home or adding warmth to a more traditional space, these models offer a range of features designed to meet diverse needs and preferences. With safety and efficiency at the forefront, these gas fireplaces are a superior choice for anyone looking to enhance their living space with both aesthetics and functionality.
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