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Customer Service and Technical Support
8.00 AM to 8.00 PM (ET) - 8.00 AM to 5.00 PM (PT)
Phone: (800) 831-7133 Fax: (800) 284-4151 -
THE ETi 250 HEATER MUST BE SERVICED BY A PROFESSIONAL SERVICE TECHNICIAN, QUALIFIED IN
POOL HEATER INSTALLATION.
Pentair strongly recommends that all vents, pipes and exhaust systems be initially and periodically tested for proper
operation. This testing can be accomplished by using a hand-held carbon monoxide meter and/or by consulting with a gas
professional. Pool and spa heaters must be used in conjunction with carbon monoxide detectors installed near the pool
heater. The carbon monoxide detectors must be periodically inspected for proper operation so as to insure continued
safety. Broken or malfunctioning carbon monoxide detectors must be replaced immediately.
IMPORTANT!
Background on the Pentair ETi® 250 Heater and Condensation
The Pentair ETi® 250 Heater is a condensing appliance. The heater' s flue gases will produce condensate while the heater is in
operation and the condensate must be drained correctly. Note: The condensate pH level is between 3.1 and 4.2. Pentair
recommends that the condensate be neutralized to avoid potential damage over time to the drainage system, and to comply
with local water authorities where applicable. To neutralize the condensate, use an optional Condensate Neutralizer Kit
(P/N 476375). The condensate drain must be installed so as to prevent accumulation of condensate. When a condensate
pump is not used, the tubing must continuously slope downward toward the drain with no spiralling.
Operating the Pentair ETi® 250 Heater in Freezing Conditions
The ETi 250 heater is designed for outdoor operation in non-freezing conditions. When operated during freezing condi-
tions, the condensate may freeze in the condensate drain tubing and/or condensate neutralizer cartridge causing the heater
to shut down due to a blocked condensate drain. This will trigger the heater to display ERR CFS (CFS (Condensate Float
Switch)). When CFS is displayed on the control panel LCD, the heater will not operate until the blockage in the condensation
drain path has been corrected and CFS has been cleared. Also, the heater condensate system components may be damaged
by the ice forming on (or inside) the condensate drain line.
Reducing the Chance of Frozen Condensate Drain when Operating the Pentair ETi® 250 Heater in
Freezing Conditions (Note: Freeze damage is not covered under warranty)
In order to reduce the chance of blockage in the condensation drain path when the ETi 250 is operated in freezing
conditions, Pentair recommends usage of NVENT RAYCHEM FROSTGUARD heating cables or similar. They are an easy-to-
use, off-the-shelf solution designed to prevent frozen pipes in a wide range of applications. NVENT RAYCHEM FROSTGUARD
heating cables or similar are available in various lengths and have a three-prong electrical connection at one end. They are
designed to work with plastic pipes. In order to work effectively, the heating cable needs to be attached to the condensate
drain tubing and condensate neutralizer, and pipe insulation needs to be placed around the heating cable, condensate drain
tubing and the condensate neutralizer See Figure 1 on page 4. The thickness of the insulation needed will vary depending on
the levels of freezing temperatures that the heater will be exposed to. NVENT RAYCHEM FROSTGUARD heating cables are
available from many plumbing supply dealers and distributors. Please follow the instructions provided with the heating
cables. Even with heating cables installed on the condensate drain tubing and condensate neutralizer, during periods of
freezing weather, Pentair also recommends that the operator periodically check the condensate drain tubing and
condensate neutralizer to ensure that ice is not accumulating. Be sure to inspect the condensate drain tubing, condensate
neutralizer, and particularly the drain outlet where ice or icicles may form. Note: Damage to equipment caused by freezing
conditions is not covered under warranty.
476455.A 4/2022
ETi 250 Heater Condensate Neutralizer Kit Installation Instructions
www.pentair.com
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