codes as required for each particular location.

b)Exhaust end of heater will accept a three (3") inch flue pipe using the flue pipe adapter.

c)Heater may be vented to the outdoors either vertically or horizontally.

d)If heater is to be vented horizontally:

1)Vent must exit building not less than seven (7') feet above grade when located adjacent to public walkways.

2)Vent must terminate at least three (3') feet above any forced air inlet located within ten feet (10').

3)Vent must terminate at least four (4') feet below, for (4') feet horizontally from, or one (1') foot above any door, window, or gravity inlet into any building.

4)Vent terminal shall be located at least twelve (12") inches from any opening through which vent gases could enter the building.

e)Vent terminal opening must be beyond any combustible overhang.

f)If condensation in the flue is a problem, the flue length should be shortened or insulated.

g)For vent specifications all of the following conditions must be met:

The maximum equivalent length of vent pipe should be carefully observed. A safety switch in the heater is designed to shut

the heater off before excessive flue restriction causes bad combustion.

Minimum Equivalent Length = 5 feet of Pipe Maximum Equivalent Length = 25 feet of Pipe

Use the following correction factors to obtain the equivalent length:

1)Subtract 15 feet if the run is horizontal.

2)Subtract 10 feet for an approved vent cap.

3)Subtract 10 feet for each elbow beyond 15 feet from the heater.

4)Subtract 15 feet for each elbow within 15 feet of the heater.

Limit the quantity of 90º elbows to two. When vent pipe is in a horizontal run, it must rise not less than 1/4 inch per foot from the start of the vent system towards the vent terminal.

Alternative Arrangements /Optional Equipment for Venting

Horizontal Venting

a)In combustible or noncombustible walls, use vent kits on page (3). Follow vent manufacturer's instructions for proper installation.

b)Three (3") inch O.D. flue pipe is required. Twenty five (25') feet maximum length is recommended.

c)All flue joints should be sealed using suitable product such as General Electric RTV 106 or Permatex Form-A-Gasket Red High Temperature Silicone Adhesive Sealant.

d)Vent terminal should be installed at a height sufficient to prevent blockage by snow.

e)Building materials should be protected from degradation by flue gases.

Single Wall

Single wall vent run

Single wall terminal end

Double Wall

Double wall vent run and

Double wall terminal end

Vertical Venting

a)Three (3") inch O.D. flue pipe, maximum twenty five (25') feet in length may be used as shown with approved vent cap.

b)An insulated thimble may be required to pass through combustible structures (check local codes).

c)All flue joints should be sealed using suitable products (see recommendation for horizontal venting).

Mr. Heater Gas-Fired Low-Intensity Infrared Heater

15

Operating Instructions and Owner’s Manual

Page 14 Page 16
Page 15
Image 15
Mr. Heater MHT 45 owner manual Horizontal Venting, Vertical Venting, Single Wall, Double Wall
Page 14 Page 16

MHT 45 specifications

The Mr. Heater MHT 45 is a versatile and powerful heating solution designed for both residential and commercial spaces. This portable propane heater stands out in the market due to its efficient heating capabilities and user-friendly features, making it ideal for workshops, garages, and outdoor activities.

One of the standout features of the MHT 45 is its robust heating output. It can deliver an impressive 45,000 BTUs, ensuring that even larger spaces are heated quickly and effectively. This high output is particularly beneficial during colder months, where rapid warmth is essential for comfort and productivity. The heater offers a heating range of up to 1,000 square feet, making it suitable for various applications, whether in the home or on the job site.

The MHT 45 utilizes advanced radiant heating technology, providing even warmth without requiring a fan. This technology allows for silent operation, making it an excellent option for noise-sensitive environments. Additionally, the radiant heat minimizes air movement and helps maintain humidity levels, creating a comfortable atmosphere while reducing dust and allergens in the air.

Another noteworthy characteristic is its portability. The MHT 45 comes equipped with a sturdy handle, allowing for easy transport between locations. This makes it a favorite among tradespeople who need efficient heat in different work areas or outdoor enthusiasts who want comfort while camping or tailgating.

Safety features are abundant in the Mr. Heater MHT 45. It includes an automatic shut-off system, which activates if the heater tips over, ensuring user safety. The built-in oxygen depletion sensor automatically turns the heater off if it detects low oxygen levels in the surrounding environment, providing peace of mind while operating.

The heater runs on a 20-pound propane tank, providing a substantial amount of heating time before needing a refill. This efficiency means users can rely on the MHT 45 for extended periods without frequent interruptions.

In summary, the Mr. Heater MHT 45 is a powerful propane heater packed with features that cater to both indoor and outdoor heating needs. With its high BTU output, silent operation, portability, and extensive safety measures, it represents a reliable choice for anyone looking to stay warm in various settings. Whether for personal use or demanding job sites, the MHT 45 is engineered to deliver comfort and convenience.
Top Page Image Contents