Product Guide

Specifications
510U: Flow Rate vs. Temperature Rise
Set temperature: 125°F (52°C) or lower
Set temperature: 130°F (55°C) or higher
140120100806040200
12
10
2
4
6
8
0
Flow Rate (gpm)
1
3
5
7
9
11
Set Temperature 130°F (55°C) or higher, maximum flow rate is limited to 8.0 gpm.
510U: Pressure Loss
Set temperature: 125°F (52°C) or lower
Set temperature: 130°F (55°C) or higher
Set Temperature 125°F (52°C) or higher, maximum flow rate is limited to 8.0 gpm.
8.0 10.06.0402.00.0
100
90
80
70
60
50
40
30
20
10
0
Head (ft)
220
200
180
160
140
120
100
80
60
40
20
0
Dimensions
Indoor and Outdoor Installation Options
Power Vent or Power Direct Vent Design
Ultra-Low NOx Emissions
4” Category III Vent
Gas convertible from natural gas to
propane using
the included conversion kit
Flow Rate up to 10 GPM
• Values based on factory testing. 0.4 GPM required for
continuous fire after initial ignition
Easy-Link up to 4 heaters or connect up to
20 heaters with a Multi-Unit Controller
Water Pressure: 15-150 psi
• Pressure Only Relief Valve Requires (Min 199,000 btu/h,
150 psi).
• 40 psi or above recommended for max. flow
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
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)
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
510U: Flow Rate vs. Temperature Rise
Temperature rise (°F)
Flow rate (gpm)
510U: Pressure Loss
Flow Rate (gpm)
Pressure Loss (psi) Head (ft)
28