Installation Guide

Technical Information
Electrical Specications
Thermo-Pro
18 kw
Thermo-Pro
21 kw
Thermo-Pro
24 kw
Thermo-Pro
27 kw
Heating elements 3 3 3 3
Watts 18,000 21,000 24,000 27,000
Kilowatts 18 kW 21 kW 24 kW 27 kW
Voltage 240 V 240 V 240 V 240 V
Circuit Breaker Amperage 3 x 30 A 3 x 40 A 3 x 40 A 3 x 40 A
Breaker/Relay 3 x double-pole 3 x double-pole 3 x double-pole 3 x double-pole
Total Connection Load 75 A 87.5 A 100 A 112.5 A
Cable Size (minimum) 3 x 8 AWG 3 x 8 AWG 3 x 8 AWG 3 x 8 AWG
Plumbing Specications
Minimum water ow to activate unit 0.5 gpm
Working pressure 0.5–10 bar (7–145 psi)
Tested pressure 20 bar (290 psi)
Water connections 3/4" NPT
Flow Rate
Temperature Rise
Δt (°F)
Flow Rate (gpm)
Thermo-Pro
18 kw
Thermo-Pro
21 kw
Thermo-Pro
24 kw
Thermo-Pro
27 kw
81 1.6 1.8 2 2.2
74 1.7 1.9 2.2 2.5
63 2 2.2 2.5 2.8
54 2.4 2.7 3 3.3
45 2.85 3.2 3.6 4
36 3.6 4.1 4.5 4.9
Physical Dimensions
Height Width Depth Weight
13
3
/
8
in.
(340 mm)
17
3
/
8
in.
(440 mm)
5
1
/
4
in.
(135 mm)
17 lbs
(7.7 kg)
3