ETi 250 High Efficiency Pool and Spa Heater Installation and User’s Guide
21
All plumbing on multiple ETi
®
250 heater installations must be done in parallel. See Figure 15 and Figure 16.
To prevent heater overheating and to ensure heater longevity, water flow 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 or, in the absence of local codes, with all applicable codes and industry plumbing standards. 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 and/or condensation.
TOP INLET PORT
(COLD WATER)
LOWER OUTLET PORT
(HOT WATER)
Firgue 16. Four ETi 250 Heaters Plumbing Hydraulic Diagram
To balance the system,
extend the pipe 12 inches
(305 mm) past the
end of the heater inlet.
Optional Check Valves and
Flow Meters on the heater
inlets can help to balance
the system.
To balance the system,
extend the pipe 12 inches
(305 mm) past the
end of the heater inlet.
Flow Meter
Flow Meter
Flow Meter
Flow Meter
MULTIPLE HEATER INSTALLATION
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 15. Two ETi 250 Heaters Plumbing Hydraulic Diagram
FILTER
Check Valves and Flow Meter
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.
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