Product Guide

Specifications
0
1
2
3
4
5
6
7
8
9
10
20 40
540P: Flow Rate vs. Temperature Rise
60 80 100
Set temperature: 125°F or lower
Set temperature: 130°F or higher
11
0
110
540P: Pressure Loss
0
5
10
15
20
25
30
35
40
45
50
20
40
60
80
100
0.0 1.0 2.0 3.0 4.0 5.0 6.0 7.0 8.0 9.0 10.0
Set temperature: 125°F or lower
Set temperature: 130°F or higher
0
Dimensions
Indoor and Outdoor Installation Options
Power Vent or Power Direct Vent Design
Ultra-Low NOx Emissions
Integrated recirculation pump
Flow Rate up to 10 GPM
• Values based on factory testing. 0.4 GPM required for
continuous fire after initial ignition
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
COLD 5/8" (17 mm)
GAS 5-3/4" (147 mm)
Condensate drain port
120 VAC 3" (77 mm)
Drain port 4-7/8" (124 mm)
HOT 6-3/4" (171 mm)
RETURN 3-1/8" (79 mm)
7-1/2" (189 mm)
COLD 5/8" (17 mm)
7-1/2" (189 mm)
17-3/4" (450 mm)
6-1/4" (159 mm)
7" (180 mm)
Φ 4" (102 mm)
15" (381 mm)
Φ 4" (102 mm)
FemaleFemale
23-5/8" (600 mm)
24-7/8" (631 mm)
RETURN 4-5/8" (117 mm) GAS 5-1/8" (131 mm) HOT 6-1/2" (164 mm) COLD 6-3/4" (172 mm) Condensate drain port Drain port 6-1/4" (159 mm) 120 VAC 3-7/8" (174 mm) 7-7/8" (199 mm)
11-1/4" (285 mm)
5-3/4" (147 mm)
Exhaust 2-5/8" (65 mm)
Intake 2-5/8" (68 mm)
RETURN 4-5/8" (117 mm)
GAS 5-1/8" (131 mm)
HOT 6-1/2" (164 mm)
COLD 6-3/4" (172 mm)
Condensate drain port
1/2 (13 mm)
Drain port 6-1/4" (159 mm)
120 VAC 3-7/8" (174 mm)
7-7/8" (199 mm)
120 VAC 3" (77 mm)
GAS 5-3/4" (147 mm)
Condensate drain port
Drain port 4-7/8" (124 mm)
HOT 6-3/4" (171 mm)
RETURN 3-1/8" (79 mm)
5-3/4" (147 mm)
6-1/4" (159 mm)
17-5/8" (448 mm)
540P Indoor (AT-H3P-DV)
COLD 5/8" (17 mm)
GAS 5-3/4" (147 mm)
Condensate drain port
120 VAC 3" (77 mm)
Drain port 4-7/8" (124 mm)
HOT 6-3/4" (171 mm)
RETURN 3-1/8" (79 mm)
7-1/2" (189 mm)
COLD 5/8" (17 mm)
7-1/2" (189 mm)
17-3/4" (450 mm)
6-1/4" (159 mm)
7" (180 mm)
Φ 4" (102 mm)
15" (381 mm)
Φ 4" (102 mm)
FemaleFemale
23-5/8" (600 mm)
24-7/8" (631 mm)
RETURN 4-5/8" (117 mm) GAS 5-1/8" (131 mm) HOT 6-1/2" (164 mm) COLD 6-3/4" (172 mm) Condensate drain port Drain port 6-1/4" (159 mm) 120 VAC 3-7/8" (174 mm) 7-7/8" (199 mm)
11-1/4" (285 mm)
5-3/4" (147 mm)
Exhaust 2-5/8" (65 mm)
Intake 2-5/8" (68 mm)
RETURN 4-5/8" (117 mm)
GAS 5-1/8" (131 mm)
HOT 6-1/2" (164 mm)
COLD 6-3/4" (172 mm)
Condensate drain port
1/2 (13 mm)
Drain port 6-1/4" (159 mm)
120 VAC 3-7/8" (174 mm)
7-7/8" (199 mm)
120 VAC 3" (77 mm)
GAS 5-3/4" (147 mm)
Condensate drain port
Drain port 4-7/8" (124 mm)
HOT 6-3/4" (171 mm)
RETURN 3-1/8" (79 mm)
5-3/4" (147 mm)
6-1/4" (159 mm)
17-5/8" (448 mm)
540P Indoor (AT-H3P-DV)
Easy-Link with up to 3 other T-H3 heaters
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
540P: Flow Rate vs. Temperature Rise
Temperature rise (°F)
Flow rate (gpm)
540P: Pressure Loss
Flow Rate (gpm)
Pressure Loss (psi) Head (ft)
38