P/N 474131 Rev. M 8/2020 MasterTemp Pool and Spa Heater
15
All plumbing on multiple heater installations must be done in parallel. See Figure 7 and Figure 8.
To prevent heater overheating and to ensure heater longevity, water ow to each heater must be balanced for
optimum operation. To meet recommended ow rates, be sure all installed pipes are installed in accordance with local
and state codes. To allow for proper operation and service clearance, maintain spacing to adjacent heaters. Heaters
installed too close to one another may encounter operational issues associated with exhaust fumes.
MULTIPLE HEATER INSTALLATION
OPTIONAL
2" Ball Valve Bypass
Extend 12” (305 mm)
past end heater inlet
for hydraulic balancing
Extend 12” (305 mm)
past end heater inlet
for hydraulic balancing
Figure 7. Two MasterTemp Heaters Plumbing Hydraulic Diagram
FILTER
Check Valves and Flow Meters
are optional on heater inlets
but help with system
balancing
TOP INLET PORT
(COLD WATER)
LOWER OUTLET PORT
(HOT WATER)
60-80 GPM/Unit (recommended).
Balance flow to each heater.
TOP INLET PORT
(COLD WATER)
LOWER OUTLET PORT
(HOT WATER)
Check Va lves and Flow Meters
are optional on heater inlets
but help with system
balancin g
Figure 8. Four MasterTemp Heaters Plumbing Hydraulic Diagram
Section 1. Installation
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