460906 Rev. D 8/2020 MASTERTEMP
125 Pool and Spa Heater Installation and User’s Guide
21
(*) For service access, it is advisable to allow for
sufficient clearance on at least one door panel.
15 cm
(6 in)
15 cm
(6 in)
15 cm
(6 in)
15 cm*
(6 in)
*
Figure 15.
HEATER CLEARANCES — General Requirements
INDOOR INSTALLATION OR OUTDOOR SHELTER
The following clearances must be maintained from the nearest walls: (See Figure 15 and Figure 16)
TOP .................................... 15 cm (6 in)
EXHAUST SIDE ................ 15 cm (6 in.)
Note (*) For service access it is advisable to allow for sufcient clearance on at least one door panel. The heater
is designed for installation on combustible ooring. For installation on carpeting, the heater must be mounted on
a metal or wood panel that extends at least 10 cm (3”) beyond the base of the heater. Note: Wall sensitive to heat
(for example wood), must be protected by a suitable insulation. If the heater is installed in a closet or alcove, the entire
oor shall be covered by the panel. On an outdoor shelter installation, the exhaust discharges into a vent pipe. Orient
the heater so that the vent pipe does not interfere with adjustment of the operating controls. The control panel located
on the top panel can be rotated to any of the three sides of the heater for easy access. However, the control panel must
not be located on the side where the vent is located.
INDOOR VENTING — General Requirements
NOTE: REMOVE OR COVER “OUTDOOR ONLY” LABEL LOCATED ON HEATER OUTSIDE PANEL WITH
“INDOOR INSTALLATION” LABEL (P/N 474275) INCLUDED IN ACCESSORY BAG (P/N 473607).
If you are considering connecting this heater to a pre-existing vent system, make sure that the vent system meets the
appropriate venting requirements as given in this manual on pages 22-32. If not, replace the vent system. DONOT
use a draft hood with this heater. The MasterTemp heater is capable of a 270-degree discharge rotation and with a vent
gas temperature less than 204° C (400° F). The total length of the horizontal run must not exceed the length that is
listed on Table 4, page 23.
Outlet Air
Opening
Inlet Air
Opening
Chimney or Gas Vent
Vent Cap and
Riser Furnished
by Installer
Side
Wall Vent
Heater
Chimney or Gas Vent
Vent Cap and
Riser Furnished
by Installer
Side
Wall Vent
Outlet Air Opening
Inlet Air Opening
Figure 16.
INDOOR INSTALLATION
(SEE INSTALLATION GUIDE FOR CORRECT PLACEMENT OF THIS LABEL)
HEADER SIDE .................. 15 cm (6 in.)
DOOR PANELS* .............. 15 cm (6 in.)
Section 1. Installation Instructions
OUTSIDE VENT COVER REMOVAL
The heater is supplied from the factory with a built-in stackless outside vent for outdoor installation.
Remove the outside vent cover for outdoor shelter installation.
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