Pentair MASTERTEMP 125 User Manual

MASTERTEMP 125 Pool and Spa Heater Installation and User’s Guide P/N 475114 Rev. F 8/2020
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These installation instructions are designed for use by qualied personnel only, trained especially for installation of this
type of heating equipment and related components. Some states require installation and repair by licensed personnel.
If this applies in your state, be sure your contractor bears the appropriate license. See Figure 2 for Outdoor and Indoor
Installations.
SPECIFICATIONS (DIMENSIONS IN CENTIMETERS (INCHES)
DIMENSIONS IN INCHES
Figure 2.
(5.5")
140 mm
(21")
533 mm
(21")
533 mm
(29.43")
747 mm
(23")
584 mm
(11")
28 mm
(11")
28 mm
(17.5")
445 mm
ELECTRICAL
CONDUIT PORT
FRONT VIEWTOP VIEW
EXHAUST SIDE VIEWPLUMBING SIDE VIEW
(1.5" - UK)
50 mm
Section 1. Installation
PUTTING THE HEATER INTO SERVICE
If the heater is installed below the level of the pool, or more than 0.6 meters (2 feet) above pool level, the pressure switch
setting should be adjusted. See “WATER PRESSURE SWITCH” in the “SAFETY CONTROLS Section” (page 27) and
the “CAUTION” under “BELOW POOL INSTALLATION Section” (page 5).
Before putting the heater into service for the first time, follow the instructions under “BEFORE START-UP”
(page 25). Check for proper operation of the heater by following the steps under “OPERATION INSTRUCTIONS,”
(page 25).

Pentair MASTERTEMP 125 Specifications

General

BTU Output	125, 000 BTU/hr
Fuel Type	Natural Gas or Propane
Ignition System	Electronic
Minimum Flow Rate	20 GPM
Maximum Working Pressure	50 PSI
Efficiency	82%
Water Connections	1.5 inch
Certifications	ANSI Z21.56
Voltage	120V