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Multiple Unit Installation
Heat Pump, Heater and/or Solar Combination In certain regions of the country it may be more
economical to run a heat pump during the warmer months and a gas heater during the cooler
months. In some situations it may be desirable to run the heat pump in the “Chiller” mode, if so
equipped, during the hottest portion of the year and a heater during the cooler months. The
Pentair heat pump may be used in conjunction with a gas or electric heater or any combination
of heat sources including solar. All heat sources must be plumbed in series to work correctly and
efficiently. A recommended plumbing layout for a heat pump / heater / solar combination heating
system for a pool / spa combination is shown below. Your system may not contain all of these com-
ponents, but the basic plumbing will apply by eliminating the component in the illustration
that is not a part of your system.
GAS
HEATER
F R OM SOLAR
FI LTE R
S
A
SPA
INTAKE
POOL
RETURN
SPA
RETURN
POOL
RETURN
S P
M
12"
min.
(305 mm)
HEAT PUMP
CHECK
VALVE
FROM SOLAR
TO SOLAR
PUMP
POOL
DRAIN
SPA
DRAIN
CHECK
VALVE
SPA
MAKE-UP
Figure 6: Multiple Heat Source Configuration
Installation