Wis. Admin. Code Department of Safety and Professional Services SPS 323.04 - Types and location of equipment

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(1) GENERAL.

(a) All heat producing appliances and cooling appliances shall be listed by a testing agency acceptable to the department.

(b) Installation and maintenance of gas-fueled appliances shall comply with the appliance listing and the requirements of NFPA 54, National Fuel Gas Code, except as otherwise required under this chapter.

(c) The clearances from combustible materials in Tables 323.04 -A and 323.04-B shall apply unless otherwise shown on listed appliances.

TABLE 323.04-A

STANDARD INSTALLATION CLEARANCES (INCHES) FOR HEAT-PRODUCING APPLIANCES

Residential Type Appliances for Installation in Rooms Which are Large (See Note 2)				Appliance¹
		Above Top of Casing or Appliance	From Top and Sides of Warm-Air Bonnet or Plenum	From Front See Note 3	From Back	From Sides
Boilers and Water Heaters	Automatic Oil
Steam Boilers - 15 psi	or	6	-	24	6	6
Water Boilers - 250° F	Comb. Gas-Oil
Water Heaters - 200° F	Automatic Gas	6	-	18	6	6
All Water Walls or Jacketed	Electric	6	-	18	6	6
Furnaces - Central	Automatic Oil
Gravity, Upflow, Downflow,	or	6⁴	6	24	6	6
Horizontal and Duct,	Comb. Gas-Oil
Warm-Air - 250° F	Automatic Gas	6⁴	6	18	6	6
	Electric	6⁴	6	18	6	6
Furnaces - Floor	Automatic Oil
For Mounting in Combustible Floors	or	36	-	12	12	12
	Comb. Gas-Oil
	Automatic Gas	36	-	12	12	12
	Electric	36	-	12	12	12
Heat Exchanger
Steam - 15 psi Max.
Hot Water - 250° F Max.	-	1	1	1	1	1
Room Heaters
Circulating Type	Oil	36	-	24	12	12
Vented or Unvented	Gas	36	-	24	12	12
Radiant or Other Type	Oil	36	-	36	36	36
Vented or Unvented	Gas	36	-	36	18	18
	Gas with dbl metal or ceramic back	36	-	36	12	18
Radiators
Steam or Hot Water	Gas	36	-	6	6	6
		See Note 5			Firing Side	Opp. Side
Ranges - Cooking Stoves	Oil	30	-	-	-
Vented or Unvented	Gas	30	-	-	6	6
	Electric	30	-	-	6	6
Clothes Dryers	Gas	6	-	24	6	6
Listed Types	Electric	6	-	24	0	0
Incinerators		See Note 6
Residential Types	-	36	-	48	36	36

¹ Standard clearances may be reduced by affording protection to combustible material in accordance with Table 323.04-B.

² Rooms which are large in comparison to the size of the appliance are those having a volume equal to at least 12 times the total volume of a furnace and at least 16 times the total volume of a boiler. If the actual ceiling height of a room is greater than 8 feet, the volume of a room should be figured on the basis of a ceiling height of 8 feet.

³ The minimum dimension should be that necessary for servicing the appliance including access for cleaning and normal care, tube removal, etc.

⁴ For a listed oil, combination gas-oil, gas, or electric furnace this dimension may be 2 inches if the furnace limit control cannot be set higher than 250° F or this dimension may be one inch if the limit control cannot be set higher than 200° F

⁵ To combustible material or metal cabinets. If the underside of such combustible material or metal cabinet is protected with asbestos millboard at least 1/4-inch thick covered with sheet metal of not less than No. 28 gauge, the distance may be not less than 24 inches. Also, if the manufacturer of the range, cooktop, or cooking stove specifies a shorter clearance, that clearance may be used instead.

⁶ Clearance above charging door should be not less than 48 inches.

TABLE 323.04-B

CLEARANCES, INCHES, WITH SPECIFIED FORMS OF PROTECTION*

Type of Protection Applied to the combustible material unless otherwise specified and covering all surfaces within the distance specified as the required clearance with no protection. Thicknesses are minimum.	Where required clearance with no projection is:
	36 inches			18 inches			12 inches			6 inches
	Above	Sides & Rear	Vent Connector	Above	Sides & Rear	Vent Connector	Above	Sides & Rear	Vent Connector	Above	Sides & Rear	Vent Connector
(a) 1/4-in. insulating millboard spaced out 1"*	30	18	30	15	9	12	9	6	6	3	2	3
(b) 28 gage sheet metal on 1/4" insulating millboard**	24	18	24	12	9	12	9	6	4	3	2	2
(c) 28 gage sheet metal spaced out 1"***	18	12	18	9	6	9	6	4	4	2	2	2
(d) 28 gage sheet metal on 1/4" insulating millboard spaced out 1"*	18	12	18	9	6	9	6	4	4	2	2	2
(e) 1/4" insulated millboard** on 1" mineral wool batts reinforced with wire mesh or equivalent	18	12	18	6	6	6	4	4	4	2	2	2
(f) 22 gage sheet metal on 1" mineral wool batts reinforced with wire or equivalent	18	12	12	4	3	3	2	2	2	2	2	2
(g) 1/4" insulated millboard**	36	36	36	18	18	18	12	12	9	4	4	4

*All clearances shall be measured from the outer surface of the equipment to the combustible material disregarding any intervening protection applied to the combustible material.

**A factory fabricated board formed with noncombustible materials, normally fibers, and having a thermal conductivity in the range of 1 Btu inch per square foot per °F, or less.

***Spacers shall be of noncombustible material.

(2) FURNACES. The input and output capacity of furnaces shall be listed on the nameplate. All nameplates shall show evidence that the equipment has been listed by a recognized testing laboratory.

(a) Fuel supply. Furnaces shall be fired with the fuel for which they have been approved, except as provided in par. (d). Fuels shall be supplied to the furnace in the volume and at the pressure required on the label.

(b) Unvented furnaces and space heaters. The use of unvented furnaces and space heaters fueled by natural gas, kerosene, alcohol or other fuel shall be prohibited due to concerns about oxygen depletion; contamination from carbon monoxide, carbon dioxide, nitrogen dioxide, formaldehyde and other combustion related contaminants; and water vapor buildups.

(c) Vented wall furnaces. Vented wall furnaces shall not be equipped with duct extensions beyond the vertical and horizontal limits of the enclosure unless listed. Vented wall furnaces shall be located to prevent the restriction of air circulation by doors, projections, or other openings. Vented wall furnaces shall be provided with combustion air.

(d) Conversion burners. Conversion burners shall be listed by a recognized testing laboratory. The existing equipment shall be reconditioned and defective parts replaced before a conversion burner is installed. Conversion burners shall be installed in accordance with the installation instructions.

(3) HEAT PUMP APPLIANCES.

(a) Size. Heat pump appliances shall be sized to provide control of the wet and dry bulb temperatures during cooling and maximum performance during heating. The heating balance point shall be considered to determine the outdoor temperature at which the heat pump must operate 100% of the time to offset the dwelling heat loss.

(b) Auxiliary heaters. Provisions for auxiliary heat to supplement the heat pump at outdoor temperatures below the balance point shall be provided. Auxiliary heaters shall be sized so that the heat pump auxiliary will offset the dwelling heat loss down to the heating design temperature.

(4) BOILERS.

(a) Boilers and solid fuel-fired water-heating appliances that serve a one-or 2-family dwelling, whether located inside or outside the dwelling, shall comply with ch. SPS 341, Boilers and Pressure Vessels.

(b) Solid fuel-fired water-heating appliances installed inside one or two family dwellings are exempt from the requirements of s. SPS 341.49(3).

Note: The department will accept equipment listed by the American Society of Mechanical Engineers, Underwriters' Laboratories, and the American Gas Association.

Note: The appliances addressed in this section include non-pressurized solid-fuel-fired water-heating appliances used for space heating.

(5) WATER HEATERS USED FOR SPACE HEATING.

(a) Listing.

1. Water heaters used for space heating shall be listed for such use.

2. The data plate shall indicate that the unit is suitable for simultaneous water heating and space heating.

Note: ANSI Z21.10.1 or ANSI Z21.10.3 are acceptable listing standards for dual use water heaters.

(b) Sizing. A dual use water heater shall be sized to provide sufficient hot water to supply both the daily and hourly peak loads of the dwelling.

Note: The Wisconsin Uniform Plumbing Code requires dual use water heaters to be installed by a licensed plumber when installed in a new, not-yet-occupied dwelling. The plumbing code also requires that a floor drain be provided, if the water heater is installed on the lowest floor level and that all piping be suitable for potable water.

(d) Heat exchanger. A single-wall heat exchanger may not be used with a toxic heat transfer fluid.

(6) LOCATION.

(a) Enclosed spaces. Except as provided in par. (c), no space heating or water-heating appliance shall be installed in a bedroom, bathroom, closet, or garage unless listed for such installation.

(b) Garages. Appliances installed in garages shall have burners and burner ignition devices located at least 18 inches above the floor and shall be protected or located so the furnace is not subject to damage from a vehicle.

1. Vented decorative gas appliances and decorative gas appliances for installation in vented fireplaces may be installed in bedrooms or bathrooms only when both of the following conditions are met:

a. The volume of the space in which the appliance is located is not less than 50 cubic feet per 1000 Btu/h of the combined input rating of all fuel-burning appliances installed in that space. The space may be made up of more than one room if the rooms are connected through doorway openings without doors.

b. The vapor retarder is not continuous on walls and ceilings exposed to the outside atmosphere as allowed under s. SPS 322.38.

2. Water heaters may be installed in a closet located in a bathroom or bedroom where the closet is used exclusively for the water heater, where the enclosed space has a weather-stripped solid door with a self-closing device, and where all air for combustion is obtained from the outdoors.

Notes

Wis. Admin. Code Department of Safety and Professional Services SPS 323.04

Cr. Register, November, 1979, No. 287, eff. 6-1-80; r. and recr. (1) (b), and am. (4) (b), Register, February, 1985, No. 350, eff. 3-1-85; correction in (3) made under s. 13.93(2m) (b) 7, Stats., Register, February, 1985, No. 350; am. (intro.) and Table 23.04-A, r. (4), renum. Figures to ILHR 23.045, Register, January, 1989, No. 397, eff. 2-1-89; correction in (3) made under s. 13.93(2m) (b) 7, Stats., Register, January, 1989, No. 397; am. (intro.) and (1) (e), r. and recr. Table 23.04-B, Register, March, 1992, No. 435, eff. 4-1-92; r. (1) (e) and cr. (4), Register, March, 2001, No. 543, eff. 4-1-01; CR 08-028: am. (3) Register November 2008 No. 635, eff. 12-1-08; CR 08-043: renum. (intro.), (1) to (3) and (4) to be (1) to (4) and (6) and am. (1), cr. (5) Register March 2009 No. 639, eff. 4-1-09; correction in (6) (c) 1. b. made under s. 13.92(4) (b) 7, Stats., Register March 2009 No. 639; correction in (1) (c), (4), (6) (c) 1. b. made under s. 13.92(4) (b) 7, Stats., Register December 2011 No. 672. Amended by, CR 15-041: renum. (4) to (4) (a), cr. (4) (b) Register December 2015 No. 720, eff.1/1/2016

Note: Section SPS 323.06 still requires combustion air to be provided to the appliance.

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