Product Guide
I = Indoor
O = Outdoor
Models
Non-Condensing Ultra-Low NOx
110C Series
Great for
apartments,
condos and
summer cabins.
3/4”
Gas/Water
120 VAC
3” / 5” Concentric,
43’ Max
N/A
120 - 140
(100 - 140)
6.6 0.81 140,000
H= 20-1/4”
W= 13-3/4”
D= 7-3/4”
33 lbs
310C Series
Adds 1 more
shower over the
110 at minimal
increase in cost.
3/4”
Gas/Water
120 VAC
3” / 5” Concentric,
43’ Max
N/A
120 - 140
(100 - 140)
8.0 0.82 190,000
H= 20-1/4”
W= 13-3/4”
D= 9-1/2”
38 lbs
510C Series
Well suited for
light commercial
applications.
Commerical-grade
copper
3/4”
Gas/Water
120 VAC
3” / 5” Concentric,
43’ Max
(EL) 4 units
(MU) 20 unit
104 - 185
(100 - 176)
10.0 0.81 199,000
H= 20-1/4”
W= 13-3/4”
D= 9-1/2”
39 lbs
110U Series
Great for
apartments,
condos and
summer cabins.
3/4”
Gas/Water
120 VAC
I Model:
3” Intake, 60’ Max
4” Exhaust, 60’ Max
N/A
120 - 140
(100 - 140)
6.6
I: 0.81
O: 0.81
140,000
H= 20-1/4”
W= 13-3/4”
D= 7-3/4”
33 lbs
310U Series
Adds 1 more
shower over the
110 at minimal
increase in cost.
3/4”
Gas/Water
120 VAC
I Model:
3” Intake, 60’ Max
4” Exhaust, 60’ Max
N/A
120 to 140
(100-140)
8.0
I: 0.82
O: 0.82
190,000
H= 20-1/4”
W= 13-3/4”
D= 9-1/2”
38 lbs
510U Series
Well suited for
light commercial
applications.
Commericalgrade
copper
3/4”
Gas/Water
120 VAC
I Model:
3” Intake, 60’ Max
4” Exhaust, 60’ Max
(EL) 4 units
(MU) 20
units
120 - 140
(100 - 160)
10.0
I: 0.82
O: 0.81
199,000
H= 20-1/4”
W= 13-3/4”
D= 9-1/2”
39 lbs
Commercial
M50 Series
Generates Most
GPM in tankless
industry.
14.5 GPM (Max).
Commercial-grade
copper
alloy. LED display
1”
Gas/Water
120 VAC
5” Intake, 50’ Max
5” Exhaust, 50’ Max
(EL) 4 units
(MU) 10
units
100 - 185
(100 - 185)
14.5 (Up
to 145
GPM max
with 10 unit
system)
Thermal
Efficiency
NG: 80.2%
LP: 82.4%
380,000
H= 25-1/4”
W= 24-3/4”
D= 11-3/4”
112 lbs
CT-199 Series
High efficiency
ultra-low NOx
condensing
tankless.
3” PVC venting.
0” clearance to
combustible.
3/4”
Gas/Water
120 VAC
Intake & Exhaust 3”, 70’
Max,
5 elbow Max
OR
4”, 100’ Max,
5 elbow Max
(EL) 4 units
(MU) 20
units
100 - 185
(100 - 185)
10.0 (Up
to 200
GPM max
with 20 unit
system)
Thermal
Efficiency:
96%
I: 0.93
O: 0.95
199,000
H = 23-5/8”
W = 17-3/4”
D = 11-3/4”
59 lbs
Connection:
Gas/Water
Power
Venting Intake
Exhaust
Easy-Link
(EL)
Multi-Unit
(MU)
Temperature
(with
remote)
GPM
(Max)
Per Unit
Uniform
Energy
Factor
Max
BTU/h
Dimension/
Weight
TK-110U-I
TK-110U-E
TK-310U-I
TK-310U-E
TK-510U-I
TK-510U-E
TK-110C-NI TK-310C-NI TK-510C-NI
ASME
model
available
T-M50
TCT-199I
TCT-199O
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