Brochure

72
*For outdoor models, change “ATI” to “ATO”. Units are field convertible from natural gas to
propane with supplied conversion kit.
**For propane models, minimum inlet gas pressure is 8.0 in. W.C. and maximum inlet gas
pressure is 14.0 in. W.C.
† Cold climate represents 70°F temperature rise
‡ Warm climate represents 50°F temperature rise
INDOOR MODEL
OUTDOOR MODEL
120 VAC 1-5/8" (40 mm)
COLD 1-5/8" (41 mm)
GAS 5" (127 mm)
HOT 4-5/8" (116 mm)
20-1/2" (520 mm)
1" (26 mm)
13-3/4" (350 mm)
10" (254 mm)
1-3/4" (45 mm) 1-3/4" (45 mm)
21-1/2" (545 mm)
1-3/8" (36 mm)
4-3/8" (113mm)
19-3/8" (493 mm)
120 VAC 3" (75 mm)
GAS 5-1/4" (135 mm)
HOT 6" (153 mm)
COLD 6" (153 mm)
2-1/4" (58 mm)
3-5/8"(93 mm)
10" (256 mm)
1-7/8"(47 mm)
HOT 5"(127mm)
120VAC 1-7/8" (49 mm)
GAS 4-1/4" (109 mm)
COLD 5" (127 mm)
5-1/8" (130 mm)
13-1/8" (334 mm)
4-3/8" (113 mm)
AT-KJr3U/K5U/D3U-IN
120 VAC 1-5/8" (40 mm)
COLD 1-5/8" (41 mm)
GAS 5" (127 mm)
HOT 4-5/8" (116 mm)
1" (26 mm)
13-3/4" (350 mm)
10" (254 mm)
1-3/4" (45 mm) 1-3/4" (45 mm)
21-1/2" (545 mm)
19-3/8" (493 mm)
120 VAC 3" (75 mm)
GAS 5-1/4" (135 mm)
HOT 6" (153 mm)
COLD 6" (153 mm)
9-1/2" (241 mm)
HOT 5" (127 mm)
120VAC 1-7/8" (49 mm)
GAS 4-1/4" (109 mm)
COLD 5" (127 mm)
13-1/8" (334 mm)
8" (203 mm)
1-5/8" (43 mm)
AT-KJr3U/K5U/D3U-OS
Model
Number*
Type
Gas Consumption Input Inlet Gas Pressure**
Minimum
(BTU/H)
Maximum
(BTU/H)
Minimum
(in. W.C.)
Maximum
(in. W.C.)
ATI-110U-200 Natural 15,000 140,000 4.0 10.5
ATI-310U-200 Natural 15,000 190,000 4.0 10.5
ATI-510U-200 Natural 15,000 199,000 4.0 10.5
Model
Number*
Connections
Sizing Chart
(Number of Showers)
Energy
Factor
(EF)
Water Gas
Cold
Climate†
Warm
Climate‡
ATI-110U-200 3/4” NPT 3/4” NPT 1.5 2.5 0.82
ATI-310U-200 3/4” NPT 3/4” NPT 2.5 3.5 0.82
ATI-510U-200 3/4” NPT 3/4” NPT 2.5 3.5 0.82
Model
Number*
Clearances (inches)
Approx Shipping
Weight (lbs)
Top Bottom Side Front
ATI-110U-200 12 12 3 4 43
ATI-310U-200 12 12 3 4 43
ATI-510U-200 12 12 3 4 45