Brochure

70
13-3/4" (350mm)
10" (254mm)
1-3/4" (45mm)
1-3/4" (45mm)
21-3/8" (544mm) 20-1/4" (520mm)
1-7/8" (47mm)
HOT 5-1/4" (133mm)
120V 1-3/8" (36mm)
GAS 4-7/8" (124mm)
COLD 3-1/4" (84mm)
4-3/8" (113mm)
19-3/8" (493mm)
COLD 2-7/8" (71mm)
1" (26mm)
HOT 6-1/2" (164mm)
9-1/2" (241mm)
120VAC 3-7/8" (99mm)
GAS 5-1/4" (135mm)
1-5/8" (43mm)
5" (128mm)
7-7/8" (203mm)
*For outdoor models, change “ATI” to “ATO”. For propane models, change “N” to “P”
**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
(DIMENSIONS FOR 310/510 MODELS)
OUTDOOR MODEL
GAS 4-1/4" (109 mm)
120 VAC 1-7/8" (49 mm)
COLD 4-7/8" (124 mm)
HOT 4-5/8" (119 mm)
120 VAC 1-1/2" (37 mm)
13-1/8" (334 mm)
4-3/8" (113 mm)
5-1/8" (130 mm)
GAS 1-1/2" (38 mm)
1" (26 mm)
4-3/8" (113 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)
∅4 (101 mm)
120 VAC 1-5/8" (40 mm)
COLD 1-5/8" (41 mm)
GAS 5" (127 mm)
HOT 4-5/8" (116 mm)
20-1/4" (520mm)
13-3/4" (350 mm)
1-3/8" (36 mm)
1-7/8" (47 mm)
3-5/8" (94 mm)
10" (254 mm)
7" (180 mm)
COLD 5" (127 mm)
HOT 5" (127 mm)
2-1/4" (58 mm)
Model
Number*
Type
Gas Consumption Input Inlet Gas Pressure**
Minimum**
(BTU/H)
Maximum
(BTU/H)
Minimum
(in. W.C.)
Maximum
(in. W.C.)
ATI-110-N
Natural 19,500 140,000 4.0 10.5
ATI-310-N
Natural 11,000 190,000 4.0 10.5
ATI-510-N
Natural 11,000 199,000 4.0 10.5
Model
Number*
Energy
Factor
(EF)
Connections
Sizing Chart
(Number of Showers)
Water Gas
Cold
Climate†
Warm
Climate‡
ATI-110-N
0.82 3/4” NPT 3/4” NPT 1.5 2.5
ATI-310-N
0.82 3/4” NPT 3/4” NPT 2.5 3.5
ATI-510-N
0.82 3/4” NPT 3/4” NPT 2.5 3.5
Model
Number*
Clearances (inches)
Approx Shipping
Weight (lbs)
Top Bottom Side Front
ATI-110-N
12 12 3 4 38
ATI-310-N
12 12 3 4 43
ATI-510-N
12 12 3 4 45