Water Heater Water Heater Brochure
ANSI Z21.10.3 • CSA 4.3
Gas convertible from natural gas to propane
using the included conversion kit
4” category III vent up to 60 equivalent feet
Easy-Link
TM
up to four 510U heaters or up to
twenty 510U heaters with multi-unit controller
Warranty
• 15-year limited warranty on heat exchanger in residential
applications
• 5-year limited warranty on heat exchanger in commercial
applications
• 5-year warranty on all parts
• Refer to takagi.com for further warranty details
Features
Temperature Settings
120°F (Default Setting)
110U/310U: 100-140°F (5°F Increments)
510U: 100-160°F (5°F Increments)
Electric 120 V 60 Hz 1.02 Amps
510U
only
Model Number* Type
Gas Consumption Input Inlet Gas Pressure**
UEF
Minimum
(BTU/H)
Maximum
(BTU/H)
Minimum
(in. W.C.)
Maximum
(in. W.C.)
TK-510U-I Natural 15,000 199,000 4.0 10.5 0.82
TK-510U-E Natural 15,000 199,000 4.0 10.5 0.81
TK-310U-I Natural 15,000 199,000 4.0 10.5 0.82
TK-310U-E Natural 15,000 199,000 4.0 10.5 0.82
TK-110U-I Natural 15,000 140,000 4.0 10.5 0.81
TK-110U-E Natural 15,000 140,000 4.0 10.5 0.81
Specifications
*Units are field convertible from natural gas to propane with supplied conversion kit.
**For propane, minimum inlet gas pressure is 8.0 in. W.C. and maximum inlet gas pressure is 14.0 in. W.C.
Model Number* Maximum GPM Hot/Cold Connections Gas Connection
Approx Shipping
Weight (lbs)
TK-510U-I 10 3/4" NPT 3/4” NPT 40
TK-510U-E 10 3/4" NPT 3/4” NPT 40
TK-310U-I 8 3/4" NPT 3/4” NPT 39
TK-310U-E 8 3/4" NPT 3/4” NPT 39
TK-110U-I 6.6 3/4" NPT 3/4” NPT 39
TK-110U-E 6.6 3/4" NPT 3/4” NPT 39
RESIDENTIAL NON-CONDENSING ULTRA-LOW NOX
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