Instructions / Assembly

Technical Information
Electrical Specications
Thermo-Pro
18 kw
Thermo-Pro
21 kw
Thermo-Pro
24 kw
Heating elements 3 3 3
Watts 18,000 21,000 24,000
Kilowatts 18 kW 21 kW 24 kW
Voltage 240 V 240 V 240 V
Circuit Breaker Amperage 3 x 30 A 3 x 40 A 3 x 40 A
Breaker/Relay 3 x double-pole 3 x double-pole 3 x double-pole
Total Connection Load 75 A 87.5 A 100 A
Cable Size (minimum) 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
81 1.6 1.8 2
74 1.7 1.9 2.2
63 2 2.2 2.5
54 2.4 2.7 3
45 2.85 3.2 3.6
36 3.6 4.1 4.5
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)
Plumbing
01 02
A pressure reduction device (PRD) must
be installed on the heater’s incoming
water supply line prior to installing the
unit. The maximum recommended
operating water pressure is 8 bar.
The plumbing installation
must be completed before
the electrical installation.
43
08
Before proceeding to electrical
installation, run water through the unit
for several minutes to ush out any air
bubbles from the water line.
05
0403
Copper water pipes are recommended for
use within three feet of the unit’s water inlet
and outlet. Other types of piping can be used
provided that are rated for high temperature
applications.
The plumbing installation
requires pipes or reinforced
exible hoses that can
withstand pressure up to
8 bar and that are rated
for high temperature
applications.
Residential plumbing systems with
unstable pressure or pressure above 5
bar require the application of a pressure
stabilizer valve, set to 4–5 bar.
06
If installing the heater on an upper oor or in
an attic, be sure installation is in compliance
with local code. Install a drip pan with
drainage, or a leak detector and automatic
shutoff valve, to prevent damage in case of
a leak.
07
After plumbing installation
is completed, carefully
inspect all connections,
unions, and the pressure
relief device for leaks.